NAME
openssl
—
OpenSSL command line tool
SYNOPSIS
openssl |
command [command_opts]
[command_args] |
openssl |
list-standard-commands |
list-message-digest-commands |
list-cipher-commands |
list-cipher-algorithms |
list-message-digest-algorithms |
list-public-key-algorithms |
openssl |
no- command |
DESCRIPTION
OpenSSL
is a cryptography toolkit
implementing the Transport Layer Security (TLS v1) network protocol, as well
as related cryptography standards.
The openssl
program is a command line tool
for using the various cryptography functions of
openssl
's crypto library from the shell.
The pseudo-commands
list-standard-commands
,
list-message-digest-commands
, and
list-cipher-commands
output a list (one entry per
line) of the names of all standard commands, message digest commands, or
cipher commands, respectively, that are available in the present
openssl
utility.
The pseudo-commands list-cipher-algorithms
and list-message-digest-algorithms
list all cipher
and message digest names, one entry per line. Aliases are listed as:
The pseudo-command
list-public-key-algorithms
lists all supported
public key algorithms.
The pseudo-command
no-
command tests whether a
command of the specified name is available. If command
does not exist, it returns 0 and prints
no-
command; otherwise it
returns 1 and prints command. In both cases, the
output goes to stdout and nothing is printed to stderr. Additional command
line arguments are always ignored. Since for each cipher there is a command
of the same name, this provides an easy way for shell scripts to test for
the availability of ciphers in the openssl
program.
Note:
no-
command is not able to
detect pseudo-commands such as quit
,
list-
...-commands
,
or no-
command itself.
ASN1PARSE
openssl asn1parse |
[-i ] [-dlimit
number] [-dump ]
[-genconf file]
[-genstr str]
[-in file]
[-inform der |
pem | txt ]
[-length number]
[-noout ] [-offset
number] [-oid
file] [-out
file] [-strparse
offset] |
The asn1parse
command is a diagnostic
utility that can parse ASN.1 structures. It can also be used to extract data
from ASN.1 formatted data.
The options are as follows:
-dlimit
number- Dump the first number bytes of unknown data in hex form.
-dump
- Dump unknown data in hex form.
-genconf
file,-genstr
str- Generate encoded data based on string str, file
file, or both, using the format described in
ASN1_generate_nconf(3). If only file
is present then the string is obtained from the default section using the
name “asn1”. The encoded data is passed through the ASN.1
parser and printed out as though it came from a file; the contents can
thus be examined and written to a file using the
-out
option. -i
- Indent the output according to the "depth" of the structures.
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
|txt
- The input format.
-length
number- Number of bytes to parse; the default is until end of file.
-noout
- Do not output the parsed version of the input file.
-offset
number- Starting offset to begin parsing; the default is start of file.
-oid
file- A file containing additional object identifiers (OIDs). If an OID (object
identifier) is not part of
openssl
's internal table it will be represented in numerical form (for example 1.2.3.4).Each line consists of three columns: the first column is the OID in numerical format and should be followed by whitespace. The second column is the "short name", which is a single word followed by whitespace. The final column is the rest of the line and is the "long name".
asn1parse
displays the long name. -out
file- The DER-encoded output file; the default is no encoded output (useful when
combined with
-strparse
). -strparse
offset- Parse the content octets of the ASN.1 object starting at offset. This option can be used multiple times to "drill down" into a nested structure.
CA
openssl ca |
[-batch ] [-cert
file] [-config
file] [-crl_CA_compromise
time] [-crl_compromise
time] [-crl_hold
instruction] [-crl_reason
reason] [-crldays
days] [-crlexts
section] [-crlhours
hours] [-days
arg] [-enddate
date] [-extensions
section] [-extfile
section] [-gencrl ]
[-in file]
[-infiles ] [-key
keyfile] [-keyfile
arg] [-keyform
pem] [-md
arg] [-msie_hack ]
[-name section]
[-noemailDN ] [-notext ]
[-out file]
[-outdir dir]
[-passin arg]
[-policy arg]
[-preserveDN ] [-revoke
file] [-spkac
file] [-ss_cert
file] [-startdate
date] [-status
serial] [-subj
arg] [-updatedb ]
[-verbose ] |
The ca
command is a minimal certificate
authority (CA) application. It can be used to sign certificate requests in a
variety of forms and generate certificate revocation lists (CRLs). It also
maintains a text database of issued certificates and their status.
The options relevant to CAs are as follows:
-batch
- Batch mode. In this mode no questions will be asked and all certificates will be certified automatically.
-cert
file- The CA certificate file.
-config
file- Specify an alternative configuration file.
-days
arg- The number of days to certify the certificate for.
-enddate
date- Set the expiry date. The format of the date is YYMMDDHHMMSSZ (the same as an ASN.1 UTCTime structure).
-extensions
section- The section of the configuration file containing certificate extensions to
be added when a certificate is issued (defaults to
x509_extensions
unless the-extfile
option is used). If no extension section is present, a V1 certificate is created. If the extension section is present (even if it is empty), then a V3 certificate is created. -extfile
file- An additional configuration file to read certificate
extensions from (using the default section unless the
-extensions
option is also used). -in
file- An input file containing a single certificate request to be signed by the CA.
-infiles
- If present, this should be the last option; all subsequent arguments are assumed to be the names of files containing certificate requests.
-key
keyfile- The password used to encrypt the private key. Since on some systems the command line arguments are visible, this option should be used with caution.
-keyfile
file- The private key to sign requests with.
-keyform
pem- Private key file format.
-md
alg- The message digest to use. Possible values include md5 and sha1. This option also applies to CRLs.
-msie_hack
- This is a legacy option to make
ca
work with very old versions of the IE certificate enrollment control "certenr3". It used UniversalStrings for almost everything. Since the old control has various security bugs, its use is strongly discouraged. The newer control "Xenroll" does not need this option. -name
section- Specifies the configuration file section to use
(overrides
default_ca
in theca
section). -noemailDN
- The DN of a certificate can contain the EMAIL field if present in the
request DN, however it is good policy just having the email set into the
altName
extension of the certificate. When this option is set, the EMAIL field is removed from the certificate's subject and set only in the, eventually present, extensions. The email_in_dn keyword can be used in the configuration file to enable this behaviour. -notext
- Don't output the text form of a certificate to the output file.
-out
file- The output file to output certificates to. The default is standard output. The certificate details will also be printed out to this file.
-outdir
directory- The directory to output certificates to. The certificate will be written to a file consisting of the serial number in hex with ".pem" appended.
-passin
arg- The key password source.
-policy
arg- Define the CA "policy" to use. The policy section in the
configuration file consists of a set of variables corresponding to
certificate DN fields. The values may be one of "match" (the
value must match the same field in the CA certificate),
"supplied" (the value must be present), or "optional"
(the value may be present). Any fields not mentioned in the policy section
are silently deleted, unless the
-preserveDN
option is set, but this can be regarded more of a quirk than intended behaviour. -preserveDN
- Normally, the DN order of a certificate is the same as the order of the fields in the relevant policy section. When this option is set, the order is the same as the request. This is largely for compatibility with the older IE enrollment control which would only accept certificates if their DNs matched the order of the request. This is not needed for Xenroll.
-spkac
file- A file containing a single Netscape signed public key and challenge, and
additional field values to be signed by the CA. This will usually come
from the KEYGEN tag in an HTML form to create a new private key. It is,
however, possible to create SPKACs using the
spkac
utility.The file should contain the variable SPKAC set to the value of the SPKAC and also the required DN components as name value pairs. If it's necessary to include the same component twice, then it can be preceded by a number and a ‘.’.
-ss_cert
file- A single self-signed certificate to be signed by the CA.
-startdate
date- Set the start date. The format of the date is YYMMDDHHMMSSZ (the same as an ASN.1 UTCTime structure).
-status
serial- Show the status of the certificate with serial number serial.
-updatedb
- Update database for expired certificates.
-verbose
- Print extra details about the operations being performed.
The options relevant to CRLs are as follows:
-crl_CA_compromise
time- This is the same as
-crl_compromise
, except the revocation reason is set to CACompromise. -crl_compromise
time- Set the revocation reason to keyCompromise and the compromise time to time. time should be in GeneralizedTime format, i.e. YYYYMMDDHHMMSSZ.
-crl_hold
instruction- Set the CRL revocation reason code to certificateHold and the hold instruction to instruction which must be an OID. Although any OID can be used, only holdInstructionNone (the use of which is discouraged by RFC 2459), holdInstructionCallIssuer or holdInstructionReject will normally be used.
-crl_reason
reason- Revocation reason, where reason is one of: unspecified, keyCompromise, CACompromise, affiliationChanged, superseded, cessationOfOperation, certificateHold or removeFromCRL. The matching of reason is case insensitive. Setting any revocation reason will make the CRL v2. In practice, removeFromCRL is not particularly useful because it is only used in delta CRLs which are not currently implemented.
-crldays
num- The number of days before the next CRL is due. This is the days from now
to place in the CRL
nextUpdate
field. -crlexts
section- The section of the configuration file containing CRL extensions to include. If no CRL extension section is present then a V1 CRL is created; if the CRL extension section is present (even if it is empty) then a V2 CRL is created. The CRL extensions specified are CRL extensions and not CRL entry extensions. It should be noted that some software can't handle V2 CRLs.
-crlhours
num- The number of hours before the next CRL is due.
-gencrl
- Generate a CRL based on information in the index file.
-revoke
file- A file containing a certificate to revoke.
-subj
arg- Supersedes the subject name given in the request. The arg must be formatted as /type0=value0/type1=value1/type2=...; characters may be escaped by ‘\’ (backslash), no spaces are skipped.
Many of the options can be set in the ca
section of the configuration file (or in the default section of the
configuration file), specified using default_ca
or
-name
. The options preserve
and msie_hack
are read directly from the
ca
section.
Many of the configuration file options are identical to command line options. Where the option is present in the configuration file and the command line, the command line value is used. Where an option is described as mandatory, then it must be present in the configuration file or the command line equivalent (if any) used.
certificate
- The same as
-cert
. It gives the file containing the CA certificate. Mandatory. copy_extensions
- Determines how extensions in certificate requests should be handled. If
set to
none
or this option is not present, then extensions are ignored and not copied to the certificate. If set tocopy
, then any extensions present in the request that are not already present are copied to the certificate. If set tocopyall
, then all extensions in the request are copied to the certificate: if the extension is already present in the certificate it is deleted first.The
copy_extensions
option should be used with caution. If care is not taken, it can be a security risk. For example, if a certificate request contains abasicConstraints
extension with CA:TRUE and thecopy_extensions
value is set tocopyall
and the user does not spot this when the certificate is displayed, then this will hand the requestor a valid CA certificate.This situation can be avoided by setting
copy_extensions
tocopy
and includingbasicConstraints
with CA:FALSE in the configuration file. Then if the request contains abasicConstraints
extension, it will be ignored.The main use of this option is to allow a certificate request to supply values for certain extensions such as
subjectAltName
. crl_extensions
- The same as
-crlexts
. crlnumber
- A text file containing the next CRL number to use in hex. The CRL number will be inserted in the CRLs only if this file exists. If this file is present, it must contain a valid CRL number.
database
- The text database file to use. Mandatory. This file must be present, though initially it will be empty.
default_crl_hours
,default_crl_days
- The same as the
-crlhours
and-crldays
options. These will only be used if neither command line option is present. At least one of these must be present to generate a CRL. default_days
- The same as the
-days
option. The number of days to certify a certificate for. default_enddate
- The same as the
-enddate
option. Either this option ordefault_days
(or the command line equivalents) must be present. default_md
- The same as the
-md
option. The message digest to use. Mandatory. default_startdate
- The same as the
-startdate
option. The start date to certify a certificate for. If not set, the current time is used. email_in_dn
- The same as
-noemailDN
. If the EMAIL field is to be removed from the DN of the certificate, simply set this to "no". If not present, the default is to allow for the EMAIL field in the certificate's DN. msie_hack
- The same as
-msie_hack
. name_opt
,cert_opt
- These options allow the format used to display the certificate details
when asking the user to confirm signing. All the options supported by the
x509
utilities'-nameopt
and-certopt
switches can be used here, except thatno_signame
andno_sigdump
are permanently set and cannot be disabled (this is because the certificate signature cannot be displayed because the certificate has not been signed at this point).For convenience, the value
ca_default
is accepted by both to produce a reasonable output.If neither option is present, the format used in earlier versions of
openssl
is used. Use of the old format is strongly discouraged because it only displays fields mentioned in thepolicy
section, mishandles multicharacter string types and does not display extensions. new_certs_dir
- The same as the
-outdir
command line option. It specifies the directory where new certificates will be placed. Mandatory. oid_file
- This specifies a file containing additional object identifiers. Each line of the file should consist of the numerical form of the object identifier followed by whitespace, then the short name followed by whitespace and finally the long name.
oid_section
- This specifies a section in the configuration file containing extra object identifiers. Each line should consist of the short name of the object identifier followed by ‘=’ and the numerical form. The short and long names are the same when this option is used.
policy
- The same as
-policy
. Mandatory. preserve
- The same as
-preserveDN
. private_key
- Same as the
-keyfile
option. The file containing the CA private key. Mandatory. serial
- A text file containing the next serial number to use in hex. Mandatory. This file must be present and contain a valid serial number.
unique_subject
- If the value
yes
is given, the valid certificate entries in the database must have unique subjects. If the valueno
is given, several valid certificate entries may have the exact same subject. The default value isyes
. x509_extensions
- The same as
-extensions
.
CIPHERS
openssl ciphers
[-hVv
] [-tls1
]
[cipherlist]
The ciphers
command converts
openssl
cipher lists into ordered SSL cipher
preference lists. It can be used as a way to determine the appropriate
cipher list.
The options are as follows:
-h
,-?
- Print a brief usage message.
-tls1
- Only include TLS v1 ciphers.
-V
- Verbose. List ciphers with a complete description of protocol version, key exchange, authentication, encryption and mac algorithms, any key size restrictions, and cipher suite codes (hex format).
-v
- Like
-V
, but without cipher suite codes. - cipherlist
- A cipher list to convert to a cipher preference list. If it is not
included, the default cipher list will be used.
The cipher list consists of one or more cipher strings separated by colons. Commas or spaces are also acceptable separators, but colons are normally used.
The actual cipher string can take several different forms:
It can consist of a single cipher suite, such as RC4-SHA.
It can represent a list of cipher suites containing a certain algorithm, or cipher suites of a certain type. For example SHA1 represents all cipher suites using the digest algorithm SHA1.
Lists of cipher suites can be combined in a single cipher string using the ‘+’ character (logical AND operation). For example, SHA1+DES represents all cipher suites containing the SHA1 and DES algorithms.
Each cipher string can be optionally preceded by the characters ‘!’, ‘-’, or ‘+’. If ‘!’ is used, then the ciphers are permanently deleted from the list. The ciphers deleted can never reappear in the list even if they are explicitly stated. If ‘-’ is used, then the ciphers are deleted from the list, but some or all of the ciphers can be added again by later options. If ‘+’ is used, then the ciphers are moved to the end of the list. This option doesn't add any new ciphers, it just moves matching existing ones.
If none of these characters is present, the string is just interpreted as a list of ciphers to be appended to the current preference list. If the list includes any ciphers already present, they will be ignored; that is, they will not be moved to the end of the list.
Additionally, the cipher string
@STRENGTH
can be used at any point to sort the current cipher list in order of encryption algorithm key length.
The following is a list of all permitted cipher strings and their meanings.
DEFAULT
- The default cipher list. This is determined at compile time and is
currently
ALL:!aNULL:!eNULL:!SSLv2
. This must be the first cipher string specified. COMPLEMENTOFDEFAULT
- The ciphers included in
ALL
, but not enabled by default. Currently this isADH
. Note that this rule does not covereNULL
, which is not included byALL
(useCOMPLEMENTOFALL
if necessary). ALL
- All cipher suites except the
eNULL
ciphers, which must be explicitly enabled. COMPLEMENTOFALL
- The cipher suites not enabled by
ALL
, currently beingeNULL
. HIGH
- "High" encryption cipher suites. This currently means those with key lengths larger than 128 bits.
MEDIUM
- "Medium" encryption cipher suites, currently those using 128-bit encryption.
LOW
- "Low" encryption cipher suites, currently those using 64- or 56-bit encryption algorithms.
eNULL
,NULL
- The "NULL" ciphers; that is, those offering no encryption. Because these offer no encryption at all and are a security risk, they are disabled unless explicitly included.
aNULL
- The cipher suites offering no authentication. This is currently the anonymous DH algorithms. These cipher suites are vulnerable to a "man in the middle" attack, so their use is normally discouraged.
kRSA
,RSA
- Cipher suites using RSA key exchange.
kEDH
- Cipher suites using ephemeral DH key agreement.
aRSA
- Cipher suites using RSA authentication, i.e. the certificates carry RSA keys.
aDSS
,DSS
- Cipher suites using DSS authentication, i.e. the certificates carry DSS keys.
TLSv1
- TLS v1.0 cipher suites.
DH
- Cipher suites using DH, including anonymous DH.
ADH
- Anonymous DH cipher suites.
AES
- Cipher suites using AES.
3DES
- Cipher suites using triple DES.
DES
- Cipher suites using DES (not triple DES).
RC4
- Cipher suites using RC4.
CAMELLIA
- Cipher suites using Camellia.
CHACHA20
- Cipher suites using ChaCha20.
IDEA
- Cipher suites using IDEA.
MD5
- Cipher suites using MD5.
SHA1
,SHA
- Cipher suites using SHA1.
CRL
openssl crl |
[-CAfile file]
[-CApath dir]
[-fingerprint ] [-hash ]
[-in file]
[-inform der |
pem ] [-issuer ]
[-lastupdate ]
[-nextupdate ] [-noout ]
[-out file]
[-outform der |
pem ] [-text ] |
The crl
command processes CRL files in DER
or PEM format.
The options are as follows:
-CAfile
file- Verify the signature on a CRL by looking up the issuing certificate in file.
-CApath
directory- Verify the signature on a CRL by looking up the issuing certificate in
dir. This directory must be a standard certificate
directory, i.e. a hash of each subject name (using
x509
-hash
) should be linked to each certificate. -fingerprint
- Print the CRL fingerprint.
-hash
- Output a hash of the issuer name. This can be used to look up CRLs in a directory by issuer name.
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
- The input format.
-issuer
- Output the issuer name.
-lastupdate
- Output the
lastUpdate
field. -nextupdate
- Output the
nextUpdate
field. -noout
- Do not output the encoded version of the CRL.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-text
- Print the CRL in plain text.
CRL2PKCS7
openssl crl2pkcs7 |
[-certfile file]
[-in file]
[-inform der |
pem ] [-nocrl ]
[-out file]
[-outform der |
pem ] |
The crl2pkcs7
command takes an optional
CRL and one or more certificates and converts them into a PKCS#7 degenerate
"certificates only" structure.
The options are as follows:
-certfile
file- Add the certificates in PEM file to the PKCS#7 structure. This option can be used more than once to read certificates from multiple files.
-in
file- Read the CRL from file, or standard input if not specified.
-inform
der
|pem
- The input format.
-nocrl
- Normally, a CRL is included in the output file. With this option, no CRL is included in the output file and a CRL is not read from the input file.
-out
file- Write the PKCS#7 structure to file, or standard output if not specified.
-outform
der
|pem
- The output format.
DGST
openssl dgst |
[-cd ] [-binary ]
[- digest]
[-hex ] [-hmac
key] [-keyform
pem ] [-mac
algorithm] [-macopt
nm:v]
[-out file]
[-passin arg]
[-prverify file]
[-sign file]
[-signature file]
[-sigopt
nm:v]
[-verify file]
[file ...] |
The digest functions output the message digest of a supplied file or files in hexadecimal form. They can also be used for digital signing and verification.
The options are as follows:
-binary
- Output the digest or signature in binary form.
-c
- Print the digest in two-digit groups separated by colons.
-d
- Print BIO debugging information.
-
digest- Use the specified message digest. The default is
MD5. The available digests can be displayed using
openssl
list-message-digest-commands
. The following are equivalent:openssl dgst
-md5
andopenssl
md5
. -hex
- Digest is to be output as a hex dump. This is the default case for a "normal" digest as opposed to a digital signature.
-hmac
key- Create a hashed MAC using key.
-keyform
pem
- Specifies the key format to sign the digest with.
-mac
algorithm- Create a keyed Message Authentication Code (MAC). The most popular MAC
algorithm is HMAC (hash-based MAC), but there are other MAC algorithms
which are not based on hash. MAC keys and other options should be set via
the
-macopt
parameter. -macopt
nm:v- Passes options to the MAC algorithm, specified by
-mac
. The following options are supported by HMAC:key
:string- Specifies the MAC key as an alphanumeric string (use if the key contain printable characters only). String length must conform to any restrictions of the MAC algorithm.
hexkey
:string- Specifies the MAC key in hexadecimal form (two hex digits per byte). Key length must conform to any restrictions of the MAC algorithm.
-out
file- The output file to write to, or standard output if not specified.
-passin
arg- The key password source.
-prverify
file- Verify the signature using the private key in file. The output is either "Verification OK" or "Verification Failure".
-sign
file- Digitally sign the digest using the private key in file.
-signature
file- The actual signature to verify.
-sigopt
nm:v- Pass options to the signature algorithm during sign or verify operations. The names and values of these options are algorithm-specific.
-verify
file- Verify the signature using the public key in file. The output is either "Verification OK" or "Verification Failure".
- file ...
- File or files to digest. If no files are specified then standard input is used.
DHPARAM
openssl dhparam |
[-2 | -5 ]
[-C ] [-check ]
[-dsaparam ] [-in
file] [-inform
der | pem ]
[-noout ] [-out
file] [-outform
der | pem ]
[-text ] [numbits] |
The dhparam
command is used to manipulate
DH parameter files. Only the older PKCS#3 DH is supported, not the newer
X9.42 DH.
The options are as follows:
-2
,-5
- The generator to use; 2 is the default. If present, the input file is ignored and parameters are generated instead.
-C
- Convert the parameters into C code. The parameters can then be loaded by calling the get_dhnumbits function.
-check
- Check the DH parameters.
-dsaparam
- Read or create DSA parameters, converted to DH format on output.
Otherwise, "strong" primes (such that (p-1)/2 is also prime)
will be used for DH parameter generation.
DH parameter generation with the
-dsaparam
option is much faster, and the recommended exponent length is shorter, which makes DH key exchange more efficient. Beware that with such DSA-style DH parameters, a fresh DH key should be created for each use to avoid small-subgroup attacks that may be possible otherwise. -in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
- The input format.
-noout
- Do not output the encoded version of the parameters.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-text
- Print the DH parameters in plain text.
- numbits
- Generate a parameter set of size numbits. It must be the last option. If not present, a value of 2048 is used. If this value is present, the input file is ignored and parameters are generated instead.
DSA
openssl dsa |
[-aes128 | -aes192 |
-aes256 | -des |
-des3 ] [-in
file] [-inform
der | pem ]
[-modulus ] [-noout ]
[-out file]
[-outform der |
pem ] [-passin
arg] [-passout
arg] [-pubin ]
[-pubout ] [-text ] |
The dsa
command processes DSA keys. They
can be converted between various forms and their components printed out.
Note: This command uses the traditional
SSLeay
compatible format for private key encryption:
newer applications should use the more secure PKCS#8 format using the
pkcs8
command.
The options are as follows:
-aes128
|-aes192
|-aes256
|-des
|-des3
- Encrypt the private key with the AES, DES, or the triple DES ciphers,
respectively, before outputting it. A pass phrase is prompted for. If none
of these options are specified, the key is written in plain text. This
means that using the
dsa
utility to read an encrypted key with no encryption option can be used to remove the pass phrase from a key, or by setting the encryption options it can be used to add or change the pass phrase. These options can only be used with PEM format output files. -in
file- The input file to read from, or standard input if not specified. If the key is encrypted, a pass phrase will be prompted for.
-inform
der
|pem
- The input format.
-modulus
- Print the value of the public key component of the key.
-noout
- Do not output the encoded version of the key.
-out
file- The output file to write to, or standard output if not specified. If any encryption options are set then a pass phrase will be prompted for.
-outform
der
|pem
- The output format.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-pubin
- Read in a public key, not a private key.
-pubout
- Output a public key, not a private key. Automatically set if the input is a public key.
-text
- Print the public/private key in plain text.
DSAPARAM
openssl dsaparam |
[-C ] [-genkey ]
[-in file]
[-inform der |
pem ] [-noout ]
[-out file]
[-outform der |
pem ] [-text ]
[numbits] |
The dsaparam
command is used to manipulate
or generate DSA parameter files.
The options are as follows:
-C
- Convert the parameters into C code. The parameters can then be loaded by calling the get_dsaXXX function.
-genkey
- Generate a DSA key either using the specified or generated parameters.
-in
file- The input file to read from, or standard input if not specified. If the numbits parameter is included, then this option is ignored.
-inform
der
|pem
- The input format.
-noout
- Do not output the encoded version of the parameters.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-text
- Print the DSA parameters in plain text.
- numbits
- Generate a parameter set of size numbits. If this option is included, the input file is ignored.
EC
openssl ec |
[-conv_form arg]
[-des ] [-des3 ]
[-in file]
[-inform der |
pem ] [-noout ]
[-out file]
[-outform der |
pem ] [-param_enc
arg] [-param_out ]
[-passin arg]
[-passout arg]
[-pubin ] [-pubout ]
[-text ] |
The ec
command processes EC keys. They can
be converted between various forms and their components printed out.
openssl
uses the private key format specified in
“SEC 1: Elliptic Curve Cryptography”
(http://www.secg.org/). To
convert an EC private key into the PKCS#8 private key format use the
pkcs8
command.
The options are as follows:
-conv_form
arg- Specify how the points on the elliptic curve are converted into octet
strings. Possible values are:
compressed
(the default),uncompressed
, andhybrid
. For more information regarding the point conversion forms see the X9.62 standard. Note: Due to patent issues thecompressed
option is disabled by default for binary curves and can be enabled by defining the preprocessor macroOPENSSL_EC_BIN_PT_COMP
at compile time. -des
|-des3
- Encrypt the private key with DES, triple DES, or any other cipher
supported by
openssl
. A pass phrase is prompted for. If none of these options is specified the key is written in plain text. This means that using theec
utility to read in an encrypted key with no encryption option can be used to remove the pass phrase from a key, or by setting the encryption options it can be used to add or change the pass phrase. These options can only be used with PEM format output files. -in
file- The input file to read a key from, or standard input if not specified. If the key is encrypted a pass phrase will be prompted for.
-inform
der
|pem
- The input format.
-noout
- Do not output the encoded version of the key.
-out
file- The output filename to write to, or standard output if not specified. If any encryption options are set then a pass phrase will be prompted for.
-outform
der
|pem
- The output format.
-param_enc
arg- Specify how the elliptic curve parameters are encoded. Possible value are:
named_curve
, i.e. the EC parameters are specified by an OID; orexplicit
, where the EC parameters are explicitly given (see RFC 3279 for the definition of the EC parameter structures). The default value isnamed_curve
. Note: theimplicitlyCA
alternative, as specified in RFC 3279, is currently not implemented. -passin
arg- The key password source.
-passout
arg- The output file password source.
-pubin
- Read in a public key, not a private key.
-pubout
- Output a public key, not a private key. Automatically set if the input is a public key.
-text
- Print the public/private key in plain text.
ECPARAM
openssl ecparam |
[-C ] [-check ]
[-conv_form arg]
[-genkey ] [-in
file] [-inform
der | pem ]
[-list_curves ] [-name
arg] [-no_seed ]
[-noout ] [-out
file] [-outform
der | pem ]
[-param_enc arg]
[-text ] |
The ecparam
command is used to manipulate
or generate EC parameter files. openssl
is not able
to generate new groups so ecparam
can only create EC
parameters from known (named) curves.
The options are as follows:
-C
- Convert the EC parameters into C code. The parameters can then be loaded by calling the get_ec_group_XXX function.
-check
- Validate the elliptic curve parameters.
-conv_form
arg- Specify how the points on the elliptic curve are converted into octet
strings. Possible values are:
compressed
(the default),uncompressed
, andhybrid
. For more information regarding the point conversion forms see the X9.62 standard. Note: Due to patent issues thecompressed
option is disabled by default for binary curves and can be enabled by defining the preprocessor macroOPENSSL_EC_BIN_PT_COMP
at compile time. -genkey
- Generate an EC private key using the specified parameters.
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
- The input format.
-list_curves
- Print a list of all currently implemented EC parameter names and exit.
-name
arg- Use the EC parameters with the specified "short" name.
-no_seed
- Do not include the seed for the parameter generation in the ECParameters structure (see RFC 3279).
-noout
- Do not output the encoded version of the parameters.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-param_enc
arg- Specify how the elliptic curve parameters are encoded. Possible value are:
named_curve
, i.e. the EC parameters are specified by an OID, orexplicit
, where the EC parameters are explicitly given (see RFC 3279 for the definition of the EC parameter structures). The default value isnamed_curve
. Note: theimplicitlyCA
alternative, as specified in RFC 3279, is currently not implemented. -text
- Print the EC parameters in plain text.
ENC
openssl enc |
-ciphername [-AadePp ]
[-base64 ] [-bufsize
number] [-debug ]
[-in file]
[-iv IV]
[-K key]
[-k password]
[-kfile file]
[-md digest]
[-none ] [-nopad ]
[-nosalt ] [-out
file] [-pass
arg] [-S
salt] [-salt ] |
The symmetric cipher commands allow data to be encrypted or
decrypted using various block and stream ciphers using keys based on
passwords or explicitly provided. Base64 encoding or decoding can also be
performed either by itself or in addition to the encryption or decryption.
The program can be called either as openssl
ciphername or openssl enc
-
ciphername.
Some of the ciphers do not have large keys and others have security implications if not used correctly. All the block ciphers normally use PKCS#5 padding, also known as standard block padding. If padding is disabled, the input data must be a multiple of the cipher block length.
The options are as follows:
-A
- If the
-a
option is set, then base64 process the data on one line. -a
,-base64
- Base64 process the data. This means that if encryption is taking place, the data is base64-encoded after encryption. If decryption is set, the input data is base64-decoded before being decrypted.
-bufsize
number- Set the buffer size for I/O.
-d
- Decrypt the input data.
-debug
- Debug the BIOs used for I/O.
-e
- Encrypt the input data. This is the default.
-in
file- The input file to read from, or standard input if not specified.
-iv
IV- The actual IV (initialisation vector) to use: this
must be represented as a string comprised only of hex digits. When only
the key is specified using the
-K
option, the IV must explicitly be defined. When a password is being specified using one of the other options, the IV is generated from this password. -K
key- The actual key to use: this must be represented as a
string comprised only of hex digits. If only the key is specified, the IV
must also be specified using the
-iv
option. When both a key and a password are specified, the key given with the-K
option will be used and the IV generated from the password will be taken. It probably does not make much sense to specify both key and password. -k
password- The password to derive the key from. Superseded by
the
-pass
option. -kfile
file- Read the password to derive the key from the first line of
file. Superseded by the
-pass
option. -md
digest- Use digest to create a key from a pass phrase.
digest may be one of
md5
orsha1
. -none
- Use NULL cipher (no encryption or decryption of input).
-nopad
- Disable standard block padding.
-nosalt
- Don't use a salt in the key derivation routines. This option should never be used since it makes it possible to perform efficient dictionary attacks on the password and to attack stream cipher encrypted data.
-out
file- The output file to write to, or standard output if not specified.
-P
- Print out the salt, key, and IV used, then immediately exit; don't do any encryption or decryption.
-p
- Print out the salt, key, and IV used.
-pass
arg- The password source.
-S
salt- The actual salt to use: this must be represented as a string comprised only of hex digits.
-salt
- Use a salt in the key derivation routines (the default). When the salt is being used the first eight bytes of the encrypted data are reserved for the salt: it is randomly generated when encrypting a file and read from the encrypted file when it is decrypted.
ERRSTR
openssl errstr
[-stats
] errno ...
The errstr
command performs error number
to error string conversion, generating a human-readable string representing
the error code errno. The string is obtained through
the
ERR_error_string_n(3) function and has the following
format:
error:[error code]:[library
name]:[function name]:[reason string]
[error code] is an 8-digit hexadecimal number. The remaining fields [library name], [function name], and [reason string] are all ASCII text.
The options are as follows:
-stats
- Print debugging statistics about various aspects of the hash table.
GENDSA
openssl gendsa |
[-aes128 | -aes192 |
-aes256 | -des |
-des3 ] [-out
file] [paramfile] |
The gendsa
command generates a DSA private
key from a DSA parameter file (typically generated by the
openssl dsaparam
command). DSA key generation is
little more than random number generation so it is much quicker than, for
example, RSA key generation.
The options are as follows:
-aes128
|-aes192
|-aes256
|-des
|-des3
- Encrypt the private key with the AES, DES, or the triple DES ciphers, respectively, before outputting it. A pass phrase is prompted for. If none of these options are specified, no encryption is used.
-out
file- The output file to write to, or standard output if not specified.
- paramfile
- Specify the DSA parameter file to use. The parameters in this file determine the size of the private key.
GENPKEY
openssl genpkey |
[-algorithm alg]
[cipher] [-genparam ]
[-out file]
[-outform der |
pem ] [-paramfile
file] [-pass
arg] [-pkeyopt
opt:value]
[-text ] |
The genpkey
command generates private
keys. The use of this program is encouraged over the algorithm specific
utilities because additional algorithm options can be used.
The options are as follows:
-algorithm
alg- The public key algorithm to use, such as RSA, DSA, or DH. This option must
precede any
-pkeyopt
options. The options-paramfile
and-algorithm
are mutually exclusive. - cipher
- Encrypt the private key with the supplied cipher. Any algorithm name accepted by EVP_get_cipherbyname(3) is acceptable.
-genparam
- Generate a set of parameters instead of a private key. This option must
precede any
-algorithm
,-paramfile
, or-pkeyopt
options. -out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-paramfile
file- Some public key algorithms generate a private key based on a set of
parameters, which can be supplied using this option. If this option is
used the public key algorithm used is determined by the parameters. This
option must precede any
-pkeyopt
options. The options-paramfile
and-algorithm
are mutually exclusive. -pass
arg- The output file password source.
-pkeyopt
opt:value- Set the public key algorithm option opt to
value, as follows:
- rsa_keygen_bits:numbits
- (RSA) The number of bits in the generated key. The default is 2048.
- rsa_keygen_pubexp:value
- (RSA) The RSA public exponent value. This can be a large decimal or hexadecimal value if preceded by 0x. The default is 65537.
- dsa_paramgen_bits:numbits
- (DSA) The number of bits in the generated parameters. The default is 1024.
- dh_paramgen_prime_len:numbits
- (DH) The number of bits in the prime parameter p.
- dh_paramgen_generator:value
- (DH) The value to use for the generator g.
- ec_paramgen_curve:curve
- (EC) The EC curve to use.
-text
- Print the private/public key in plain text.
GENRSA
openssl genrsa |
[-3 | -f4 ]
[-aes128 | -aes192 |
-aes256 | -des |
-des3 ] [-out
file] [-passout
arg] [numbits] |
The genrsa
command generates an RSA
private key, which essentially involves the generation of two prime numbers.
When generating the key, various symbols will be output to indicate the
progress of the generation. A ‘.’ represents each number which
has passed an initial sieve test; ‘+’ means a number has
passed a single round of the Miller-Rabin primality test. A newline means
that the number has passed all the prime tests (the actual number depends on
the key size).
The options are as follows:
-3
|-f4
- The public exponent to use, either 3 or 65537. The default is 65537.
-aes128
|-aes192
|-aes256
|-des
|-des3
- Encrypt the private key with the AES, DES, or the triple DES ciphers,
respectively, before outputting it. If none of these options are
specified, no encryption is used. If encryption is used, a pass phrase is
prompted for, if it is not supplied via the
-passout
option. -out
file- The output file to write to, or standard output if not specified.
-passout
arg- The output file password source.
- numbits
- The size of the private key to generate in bits. This must be the last option specified. The default is 2048.
NSEQ
openssl nseq
[-in
file] [-out
file] [-toseq
]
The nseq
command takes a file containing a
Netscape certificate sequence (an alternative to the standard PKCS#7 format)
and prints out the certificates contained in it, or takes a file of
certificates and converts it into a Netscape certificate sequence.
The options are as follows:
-in
file- The input file to read from, or standard input if not specified.
-out
file- The output file to write to, or standard output if not specified.
-toseq
- Normally, a Netscape certificate sequence will be input and the output is
the certificates contained in it. With the
-toseq
option the situation is reversed: a Netscape certificate sequence is created from a file of certificates.
OCSP
openssl ocsp |
[-CA file]
[-CAfile file]
[-CApath directory]
[-cert file]
[-dgst alg]
[-host
hostname:port]
[-index indexfile]
[-issuer file]
[-ndays days]
[-nmin minutes]
[-no_cert_checks ]
[-no_cert_verify ]
[-no_certs ] [-no_chain ]
[-no_intern ] [-no_nonce ]
[-no_signature_verify ]
[-nonce ] [-noverify ]
[-nrequest number]
[-out file]
[-path path]
[-port portnum]
[-req_text ] [-reqin
file] [-reqout
file] [-resp_key_id ]
[-resp_no_certs ]
[-resp_text ] [-respin
file] [-respout
file] [-rkey
file] [-rother
file] [-rsigner
file] [-serial
number] [-sign_other
file] [-signer
file] [-signkey
file] [-status_age
age] [-text ]
[-trust_other ] [-url
responder_url] [-VAfile
file] [-validity_period
nsec] [-verify_other
file] |
The Online Certificate Status Protocol (OCSP) enables applications to determine the (revocation) state of an identified certificate (RFC 2560).
The ocsp
command performs many common OCSP
tasks. It can be used to print out requests and responses, create requests
and send queries to an OCSP responder, and behave like a mini OCSP server
itself.
The options are as follows:
-CAfile
file,-CApath
directory- A file or path containing trusted CA certificates, used to verify the signature on the OCSP response.
-cert
file- Add the certificate file to the request. The issuer
certificate is taken from the previous
-issuer
option, or an error occurs if no issuer certificate is specified. -dgst
alg- Use the digest algorithm alg for certificate identification in the OCSP request. By default SHA-1 is used.
-host
hostname:port,-path
path- Send the OCSP request to hostname on
port.
-path
specifies the HTTP path name to use, or / by default. -issuer
file- The current issuer certificate, in PEM format. Can be used multiple times
and must come before any
-cert
options. -no_cert_checks
- Don't perform any additional checks on the OCSP response signer's certificate. That is, do not make any checks to see if the signer's certificate is authorised to provide the necessary status information: as a result this option should only be used for testing purposes.
-no_cert_verify
- Don't verify the OCSP response signer's certificate at all. Since this option allows the OCSP response to be signed by any certificate, it should only be used for testing purposes.
-no_certs
- Don't include any certificates in the signed request.
-no_chain
- Do not use certificates in the response as additional untrusted CA certificates.
-no_intern
- Ignore certificates contained in the OCSP response when searching for the
signer's certificate. The signer's certificate must be specified with
either the
-verify_other
or-VAfile
options. -no_signature_verify
- Don't check the signature on the OCSP response. Since this option tolerates invalid signatures on OCSP responses, it will normally only be used for testing purposes.
-nonce
,-no_nonce
- Add an OCSP nonce extension to a request, or disable an OCSP nonce
addition. Normally, if an OCSP request is input using the
-respin
option no nonce is added: using the-nonce
option will force the addition of a nonce. If an OCSP request is being created (using the-cert
and-serial
options) a nonce is automatically added; specifying-no_nonce
overrides this. -noverify
- Don't attempt to verify the OCSP response signature or the nonce values. This is normally only be used for debugging since it disables all verification of the responder's certificate.
-out
file- Specify the output file to write to, or standard output if not specified.
-req_text
,-resp_text
,-text
- Print out the text form of the OCSP request, response, or both, respectively.
-reqin
file,-respin
file- Read an OCSP request or response file from file.
These options are ignored if an OCSP request or response creation is
implied by other options (for example with the
-serial
,-cert
, and-host
options). -reqout
file,-respout
file- Write out the DER-encoded certificate request or response to file.
-serial
num- Same as the
-cert
option except the certificate with serial number num is added to the request. The serial number is interpreted as a decimal integer unless preceded by ‘0x’. Negative integers can also be specified by preceding the value with a minus sign. -sign_other
file- Additional certificates to include in the signed request.
-signer
file,-signkey
file- Sign the OCSP request using the certificate specified in the
-signer
option and the private key specified by the-signkey
option. If the-signkey
option is not present, then the private key is read from the same file as the certificate. If neither option is specified, the OCSP request is not signed. -trust_other
- The certificates specified by the
-verify_other
option should be explicitly trusted and no additional checks will be performed on them. This is useful when the complete responder certificate chain is not available or trusting a root CA is not appropriate. -url
responder_url- Specify the responder URL. Both HTTP and HTTPS (SSL/TLS) URLs can be specified.
-VAfile
file- A file containing explicitly trusted responder certificates. Equivalent to
the
-verify_other
and-trust_other
options. -validity_period
nsec,-status_age
age- The range of times, in seconds, which will be tolerated in an OCSP
response. Each certificate status response includes a notBefore time and
an optional notAfter time. The current time should fall between these two
values, but the interval between the two times may be only a few seconds.
In practice the OCSP responder and clients' clocks may not be precisely
synchronised and so such a check may fail. To avoid this the
-validity_period
option can be used to specify an acceptable error range in seconds, the default value being 5 minutes.If the notAfter time is omitted from a response, it means that new status information is immediately available. In this case the age of the notBefore field is checked to see it is not older than age seconds old. By default, this additional check is not performed.
-verify_other
file- A file containing additional certificates to search when attempting to locate the OCSP response signing certificate. Some responders omit the actual signer's certificate from the response, so this can be used to supply the necessary certificate.
The options for the OCSP server are as follows:
-CA
file- CA certificate corresponding to the revocation information in indexfile.
-index
indexfile- indexfile is a text index file in ca format
containing certificate revocation information.
If this option is specified,
ocsp
is in responder mode, otherwise it is in client mode. The requests the responder processes can be either specified on the command line (using the-issuer
and-serial
options), supplied in a file (using the-respin
option), or via external OCSP clients (if port or url is specified).If this option is present, then the
-CA
and-rsigner
options must also be present. -nmin
minutes,-ndays
days- Number of minutes or days when fresh revocation information is available: used in the nextUpdate field. If neither option is present, the nextUpdate field is omitted, meaning fresh revocation information is immediately available.
-nrequest
number- Exit after receiving number requests (the default is unlimited).
-port
portnum- Port to listen for OCSP requests on. May also be specified using the
-url
option. -resp_key_id
- Identify the signer certificate using the key ID; the default is to use the subject name.
-resp_no_certs
- Don't include any certificates in the OCSP response.
-rkey
file- The private key to sign OCSP responses with; if not present, the file
specified in the
-rsigner
option is used. -rother
file- Additional certificates to include in the OCSP response.
-rsigner
file- The certificate to sign OCSP responses with.
Initially the OCSP responder certificate is located and the
signature on the OCSP request checked using the responder certificate's
public key. Then a normal certificate verify is performed on the OCSP
responder certificate building up a certificate chain in the process. The
locations of the trusted certificates used to build the chain can be
specified by the -CAfile
and
-CApath
options or they will be looked for in the
standard openssl
certificates directory.
If the initial verify fails, the OCSP verify process halts with an error. Otherwise the issuing CA certificate in the request is compared to the OCSP responder certificate: if there is a match then the OCSP verify succeeds.
Otherwise the OCSP responder certificate's CA is checked against the issuing CA certificate in the request. If there is a match and the OCSPSigning extended key usage is present in the OCSP responder certificate, then the OCSP verify succeeds.
Otherwise the root CA of the OCSP responder's CA is checked to see if it is trusted for OCSP signing. If it is, the OCSP verify succeeds.
If none of these checks is successful, the OCSP verify fails. What this effectively means is that if the OCSP responder certificate is authorised directly by the CA it is issuing revocation information about (and it is correctly configured), then verification will succeed.
If the OCSP responder is a global responder, which can give
details about multiple CAs and has its own separate certificate chain, then
its root CA can be trusted for OCSP signing. Alternatively, the responder
certificate itself can be explicitly trusted with the
-VAfile
option.
PASSWD
openssl passwd |
[-1 | -apr1 |
-crypt ] [-in
file] [-noverify ]
[-quiet ] [-reverse ]
[-salt string]
[-stdin ] [-table ]
[password] |
The passwd
command computes the hash of a
password.
The options are as follows:
-1
- Use the MD5 based BSD password algorithm "1".
-apr1
- Use the "apr1" algorithm (Apache variant of the BSD algorithm).
-crypt
- Use the "crypt" algorithm (the default).
-in
file- Read passwords from file.
-noverify
- Don't verify when reading a password from the terminal.
-quiet
- Don't output warnings when passwords given on the command line are truncated.
-reverse
- Switch table columns. This only makes sense in conjunction with the
-table
option. -salt
string- Use the salt specified by string. When reading a
password from the terminal, this implies
-noverify
. -stdin
- Read passwords from standard input.
-table
- In the output list, prepend the cleartext password and a TAB character to each password hash.
PKCS7
openssl pkcs7 |
[-in file]
[-inform der |
pem ] [-noout ]
[-out file]
[-outform der |
pem ] [-print_certs ]
[-text ] |
The pkcs7
command processes PKCS#7 files
in DER or PEM format. The PKCS#7 routines only understand PKCS#7 v 1.5 as
specified in RFC 2315.
The options are as follows:
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
- The input format.
-noout
- Don't output the encoded version of the PKCS#7 structure (or certificates
if
-print_certs
is set). -out
file- The output to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-print_certs
- Print any certificates or CRLs contained in the file, preceded by their subject and issuer names in a one-line format.
-text
- Print certificate details in full rather than just subject and issuer names.
PKCS8
openssl pkcs8 |
[-embed ] [-in
file] [-inform
der | pem ]
[-nocrypt ] [-noiter ]
[-nooct ] [-nsdb ]
[-out file]
[-outform der |
pem ] [-passin
arg] [-passout
arg] [-topk8 ]
[-v1 alg]
[-v2 alg] |
The pkcs8
command processes private keys
(both encrypted and unencrypted) in PKCS#8 format with a variety of PKCS#5
(v1.5 and v2.0) and PKCS#12 algorithms. The default encryption is only 56
bits; keys encrypted using PKCS#5 v2.0 algorithms and high iteration counts
are more secure.
The options are as follows:
-embed
- Generate DSA keys in a broken format. The DSA parameters are embedded inside the PrivateKey structure. In this form the OCTET STRING contains an ASN.1 SEQUENCE consisting of two structures: a SEQUENCE containing the parameters and an ASN.1 INTEGER containing the private key.
-in
file- The input file to read from, or standard input if not specified. If the key is encrypted, a pass phrase will be prompted for.
-inform
der
|pem
- The input format.
-nocrypt
- Generate an unencrypted PrivateKeyInfo structure. This option does not encrypt private keys at all and should only be used when absolutely necessary.
-noiter
- Use an iteration count of 1. See the PKCS12 section below for a detailed explanation of this option.
-nooct
- Generate RSA private keys in a broken format that some software uses. Specifically the private key should be enclosed in an OCTET STRING, but some software just includes the structure itself without the surrounding OCTET STRING.
-nsdb
- Generate DSA keys in a broken format compatible with Netscape private key databases. The PrivateKey contains a SEQUENCE consisting of the public and private keys, respectively.
-out
file- The output file to write to, or standard output if none is specified. If any encryption options are set, a pass phrase will be prompted for.
-outform
der
|pem
- The output format.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-topk8
- Read a traditional format private key and write a PKCS#8 format key.
-v1
alg- Specify a PKCS#5 v1.5 or PKCS#12 algorithm to use.
- PBE-MD5-DES
- 56-bit DES.
- PBE-SHA1-RC2-64 | PBE-MD5-RC2-64 | PBE-SHA1-DES
- 64-bit RC2 or 56-bit DES.
- PBE-SHA1-RC4-128 | PBE-SHA1-RC4-40 | PBE-SHA1-3DES
- PBE-SHA1-2DES | PBE-SHA1-RC2-128 | PBE-SHA1-RC2-40
- PKCS#12 password-based encryption algorithm, which allow strong encryption algorithms like triple DES or 128-bit RC2.
-v2
alg- Use PKCS#5 v2.0 algorithms. Supports algorithms such as 168-bit triple DES
or 128-bit RC2, however not many implementations support PKCS#5 v2.0 yet
(if using private keys with
openssl
this doesn't matter).alg is the encryption algorithm to use; valid values include des, des3, and rc2. It is recommended that des3 is used.
PKCS12
openssl pkcs12 |
[-aes128 | -aes192 |
-aes256 | -des |
-des3 ] [-cacerts ]
[-CAfile file]
[-caname name]
[-CApath directory]
[-certfile file]
[-certpbe alg]
[-chain ] [-clcerts ]
[-CSP name]
[-descert ] [-export ]
[-in file]
[-info ] [-inkey
file] [-keyex ]
[-keypbe alg]
[-keysig ] [-macalg
alg] [-maciter ]
[-name name]
[-nocerts ] [-nodes ]
[-noiter ] [-nokeys ]
[-nomac ] [-nomaciter ]
[-nomacver ] [-noout ]
[-out file]
[-passin arg]
[-passout arg]
[-twopass ] |
The pkcs12
command allows PKCS#12 files
(sometimes referred to as PFX files) to be created and parsed. By default, a
PKCS#12 file is parsed; a PKCS#12 file can be created by using the
-export
option.
The options for parsing a PKCS12 file are as follows:
-aes128
|-aes192
|-aes256
|-des
|-des3
- Encrypt private keys using AES, DES, or triple DES, respectively. The default is triple DES.
-cacerts
- Only output CA certificates (not client certificates).
-clcerts
- Only output client certificates (not CA certificates).
-in
file- The input file to read from, or standard input if not specified.
-info
- Output additional information about the PKCS#12 file structure, algorithms used, and iteration counts.
-nocerts
- Do not output certificates.
-nodes
- Do not encrypt private keys.
-nokeys
- Do not output private keys.
-nomacver
- Do not attempt to verify the integrity MAC before reading the file.
-noout
- Do not output the keys and certificates to the output file version of the PKCS#12 file.
-out
file- The output file to write to, or standard output if not specified.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-twopass
- Prompt for separate integrity and encryption passwords: most software always assumes these are the same so this option will render such PKCS#12 files unreadable.
The options for PKCS12 file creation are as follows:
-CAfile
file- CA storage as a file.
-CApath
directory- CA storage as a directory. The directory must be a standard certificate
directory: that is, a hash of each subject name (using
x509
-hash
) should be linked to each certificate. -caname
name- Specify the "friendly name" for other certificates. May be used multiple times to specify names for all certificates in the order they appear.
-certfile
file- A file to read additional certificates from.
-certpbe
alg,-keypbe
alg- Specify the algorithm used to encrypt the private key and certificates to
be selected. Any PKCS#5 v1.5 or PKCS#12 PBE algorithm name can be used. If
a cipher name (as output by the
list-cipher-algorithms
command) is specified then it is used with PKCS#5 v2.0. For interoperability reasons it is advisable to only use PKCS#12 algorithms. -chain
- Include the entire certificate chain of the user certificate. The standard CA store is used for this search. If the search fails, it is considered a fatal error.
-CSP
name- Write name as a Microsoft CSP name.
-descert
- Encrypt the certificate using triple DES; this may render the PKCS#12 file unreadable by some "export grade" software. By default, the private key is encrypted using triple DES and the certificate using 40-bit RC2.
-export
- Create a PKCS#12 file (rather than parsing one).
-in
file- The input file to read from, or standard input if not specified. The order doesn't matter but one private key and its corresponding certificate should be present. If additional certificates are present, they will also be included in the PKCS#12 file.
-inkey
file- File to read a private key from. If not present, a private key must be present in the input file.
-keyex
|-keysig
- Specify whether the private key is to be used for key exchange or just
signing. Normally, "export grade" software will only allow
512-bit RSA keys to be used for encryption purposes, but arbitrary length
keys for signing. The
-keysig
option marks the key for signing only. Signing only keys can be used for S/MIME signing, authenticode (ActiveX control signing) and SSL client authentication. -macalg
alg- Specify the MAC digest algorithm. The default is SHA1.
-maciter
- Included for compatibility only: it used to be needed to use MAC iterations counts but they are now used by default.
-name
name- Specify the "friendly name" for the certificate and private key. This name is typically displayed in list boxes by software importing the file.
-nomac
- Don't attempt to provide the MAC integrity.
-nomaciter
,-noiter
- Affect the iteration counts on the MAC and key algorithms.
To discourage attacks by using large dictionaries of common passwords, the algorithm that derives keys from passwords can have an iteration count applied to it: this causes a certain part of the algorithm to be repeated and slows it down. The MAC is used to check the file integrity but since it will normally have the same password as the keys and certificates it could also be attacked. By default, both MAC and encryption iteration counts are set to 2048; using these options the MAC and encryption iteration counts can be set to 1. Since this reduces the file security you should not use these options unless you really have to. Most software supports both MAC and key iteration counts.
-out
file- The output file to write to, or standard output if not specified.
-passin
arg- The key password source.
-passout
arg- The output file password source.
PKEY
openssl pkey |
[cipher] [-in
file] [-inform
der | pem ]
[-noout ] [-out
file] [-outform
der | pem ]
[-passin arg]
[-passout arg]
[-pubin ] [-pubout ]
[-text ] [-text_pub ] |
The pkey
command processes public or
private keys. They can be converted between various forms and their
components printed out.
The options are as follows:
- cipher
- Encrypt the private key with the specified cipher. Any algorithm name
accepted by
EVP_get_cipherbyname(3) is acceptable, such as
des3
. -in
file- The input file to read from, or standard input if not specified. If the key is encrypted a pass phrase will be prompted for.
-inform
der
|pem
- The input format.
-noout
- Do not output the encoded version of the key.
-out
file- The output file to write to, or standard output if not specified. If any encryption options are set then a pass phrase will be prompted for.
-outform
der
|pem
- The output format.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-pubin
- Read in a public key, not a private key.
-pubout
- Output a public key, not a private key. Automatically set if the input is a public key.
-text
- Print the public/private key in plain text.
-text_pub
- Print out only public key components even if a private key is being processed.
PKEYPARAM
openssl pkeyparam
[-in
file]
[-noout
] [-out
file] [-text
]
The pkeyparam
command processes public or
private keys. The key type is determined by the PEM headers.
The options are as follows:
-in
file- The input file to read from, or standard input if not specified.
-noout
- Do not output the encoded version of the parameters.
-out
file- The output file to write to, or standard output if not specified.
-text
- Print the parameters in plain text.
PKEYUTL
openssl pkeyutl |
[-asn1parse ] [-certin ]
[-decrypt ] [-derive ]
[-encrypt ] [-hexdump ]
[-in file]
[-inkey file]
[-keyform der |
pem ] [-out
file] [-passin
arg] [-peerform
der | pem ]
[-peerkey file]
[-pkeyopt
opt:value]
[-pubin ] [-rev ]
[-sigfile file]
[-sign ] [-verify ]
[-verifyrecover ] |
The pkeyutl
command can be used to perform
public key operations using any supported algorithm.
The options are as follows:
-asn1parse
- ASN.1 parse the output data. This is useful when combined with the
-verifyrecover
option when an ASN.1 structure is signed. -certin
- The input is a certificate containing a public key.
-decrypt
- Decrypt the input data using a private key.
-derive
- Derive a shared secret using the peer key.
-encrypt
- Encrypt the input data using a public key.
-hexdump
- Hex dump the output data.
-in
file- The input file to read from, or standard input if not specified.
-inkey
file- The input key file. By default it should be a private key.
-keyform
der
|pem
- The key format.
-out
file- The output file to write to, or standard output if not specified.
-passin
arg- The key password source.
-peerform
der
|pem
- The peer key format.
-peerkey
file- The peer key file, used by key derivation (agreement) operations.
-pkeyopt
opt:value- Set the public key algorithm option opt to
value. Unless otherwise mentioned, all algorithms
support the format digest:alg,
which specifies the digest to use for sign, verify, and verifyrecover
operations. The value alg should represent a digest
name as used in the
EVP_get_digestbyname(3) function.
The RSA algorithm supports the encrypt, decrypt, sign, verify, and verifyrecover operations in general. Some padding modes only support some of these operations however.
- rsa_padding_mode:mode
- This sets the RSA padding mode. Acceptable values for
mode are
pkcs1
for PKCS#1 padding;none
for no padding;oaep
for OAEP mode;x931
for X9.31 mode; andpss
for PSS.In PKCS#1 padding if the message digest is not set then the supplied data is signed or verified directly instead of using a DigestInfo structure. If a digest is set then a DigestInfo structure is used and its length must correspond to the digest type. For oeap mode only encryption and decryption is supported. For x931 if the digest type is set it is used to format the block data; otherwise the first byte is used to specify the X9.31 digest ID. Sign, verify, and verifyrecover can be performed in this mode. For pss mode only sign and verify are supported and the digest type must be specified.
- rsa_pss_saltlen:len
- For pss mode only this option specifies the salt length. Two special values are supported: -1 sets the salt length to the digest length. When signing -2 sets the salt length to the maximum permissible value. When verifying -2 causes the salt length to be automatically determined based on the PSS block structure.
The DSA algorithm supports the sign and verify operations. Currently there are no additional options other than digest. Only the SHA1 digest can be used and this digest is assumed by default.
The DH algorithm supports the derive operation and no additional options.
The EC algorithm supports the sign, verify, and derive operations. The sign and verify operations use ECDSA and derive uses ECDH. Currently there are no additional options other than digest. Only the SHA1 digest can be used and this digest is assumed by default.
-pubin
- The input file is a public key.
-rev
- Reverse the order of the input buffer.
-sigfile
file- Signature file (verify operation only).
-sign
- Sign the input data and output the signed result. This requires a private key.
-verify
- Verify the input data against the signature file and indicate if the verification succeeded or failed.
-verifyrecover
- Verify the input data and output the recovered data.
PRIME
openssl prime
[-bits
n]
[-checks
n]
[-generate
] [-hex
]
[-safe
] p
The prime
command is used to generate
prime numbers, or to check numbers for primality. Results are probabilistic:
they have an exceedingly high likelihood of being correct, but are not
guaranteed.
The options are as follows:
-bits
n- Specify the number of bits in the generated prime number. Must be used in
conjunction with
-generate
. -checks
n- Perform a Miller-Rabin probabilistic primality test with n iterations. The default is 20.
-generate
- Generate a pseudo-random prime number. Must be used in conjunction with
-bits
. -hex
- Output in hex format.
-safe
- Generate only "safe" prime numbers (i.e. a prime p so that (p-1)/2 is also prime).
- p
- Test if number p is prime.
RAND
openssl rand |
[-base64 ] [-hex ]
[-out file]
num |
The rand
command outputs
num pseudo-random bytes.
The options are as follows:
-base64
- Perform base64 encoding on the output.
-hex
- Specify hexadecimal output.
-out
file- The output file to write to, or standard output if not specified.
REQ
openssl req |
[-asn1-kludge ] [-batch ]
[-config file]
[-days n]
[-extensions section]
[-in file]
[-inform der |
pem ] [-key
keyfile] [-keyform
der | pem ]
[-keyout file]
[-md4 | -md5 |
-sha1 ] [-modulus ]
[-nameopt option]
[-new ] [-newhdr ]
[-newkey arg]
[-no-asn1-kludge ] [-nodes ]
[-noout ] [-out
file] [-outform
der | pem ]
[-passin arg]
[-passout arg]
[-pubkey ] [-reqexts
section] [-reqopt
option] [-set_serial
n] [-subj
arg] [-subject ]
[-text ] [-utf8 ]
[-verbose ] [-verify ]
[-x509 ] |
The req
command primarily creates and
processes certificate requests in PKCS#10 format. It can additionally create
self-signed certificates, for use as root CAs, for example.
The options are as follows:
-asn1-kludge
- Produce requests in an invalid format for certain picky CAs. Very few CAs still require the use of this option.
-batch
- Non-interactive mode.
-config
file- Specify an alternative configuration file.
-days
n- Specify the number of days to certify the certificate for. The default is
30 days. Used with the
-x509
option. -extensions
section,-reqexts
section- Specify alternative sections to include certificate extensions (with
-x509
) or certificate request extensions, allowing several different sections to be used in the same configuration file. -in
file- The input file to read a request from, or standard input if not specified.
A request is only read if the creation options
-new
and-newkey
are not specified. -inform
der
|pem
- The input format.
-key
keyfile- The file to read the private key from. It also accepts PKCS#8 format private keys for PEM format files.
-keyform
der
|pem
- The format of the private key file specified in the
-key
argument. The default ispem
. -keyout
file- The file to write the newly created private key to. If this option is not specified, the filename present in the configuration file is used.
-md5
|-sha1
|-sha256
- The message digest to sign the request with. This overrides the digest
algorithm specified in the configuration file.
Some public key algorithms may override this choice. For instance, DSA signatures always use SHA1.
-modulus
- Print the value of the modulus of the public key contained in the request.
-nameopt
option,-reqopt
option- Determine how the subject or issuer names are displayed. option can be a single option or multiple options separated by commas. Alternatively, these options may be used more than once to set multiple options. See the X509 section below for details.
-new
- Generate a new certificate request. The user is prompted for the relevant
field values. The actual fields prompted for and their maximum and minimum
sizes are specified in the configuration file and any requested
extensions.
If the
-key
option is not used, it will generate a new RSA private key using information specified in the configuration file. -newhdr
- Add the word NEW to the PEM file header and footer lines on the outputed request. Some software and CAs need this.
-newkey
arg- Create a new certificate request and a new private key. The argument takes
one of several forms.
rsa:nbits generates an RSA key nbits in size. If nbits is omitted the default key size is used.
dsa:file generates a DSA key using the parameters in file.
param:file generates a key using the parameters or certificate in file.
All other algorithms support the form algorithm:file, where file may be an algorithm parameter file, created by the
genpkey -genparam
command or an X.509 certificate for a key with appropriate algorithm. file can be omitted, in which case any parameters can be specified via the-pkeyopt
option. -no-asn1-kludge
- Reverse the effect of
-asn1-kludge
. -nodes
- Do not encrypt the private key.
-noout
- Do not output the encoded version of the request.
-out
file- The output file to write to, or standard output if not spceified.
-outform
der
|pem
- The output format.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-pubkey
- Output the public key.
-reqopt
option- Customise the output format used with
-text
. The option argument can be a single option or multiple options separated by commas. See also the discussion of-certopt
in thex509
command. -set_serial
n- Serial number to use when outputting a self-signed certificate. This may be specified as a decimal value or a hex value if preceded by ‘0x’. It is possible to use negative serial numbers but this is not recommended.
-subj
arg- Replaces the subject field of an input request with the specified data and output the modified request. arg must be formatted as /type0=value0/type1=value1/type2=...; characters may be escaped by ‘\’ (backslash); no spaces are skipped.
-subject
- Print the request subject (or certificate subject if
-x509
is specified). -text
- Print the certificate request in plain text.
-utf8
- Interpret field values as UTF8 strings, not ASCII.
-verbose
- Print extra details about the operations being performed.
-verify
- Verify the signature on the request.
-x509
- Output a self-signed certificate instead of a certificate request. This is
typically used to generate a test certificate or a self-signed root CA.
The extensions added to the certificate (if any) are specified in the
configuration file. Unless specified using the
-set_serial
option, 0 is used for the serial number.
The configuration options are specified in the "req" section of the configuration file. The options available are as follows:
attributes
- The section containing any request attributes: its format is the same as
distinguished_name
. Typically these may contain the challengePassword or unstructuredName types. They are currently ignored by theopenssl
request signing utilities, but some CAs might want them. default_bits
- The default key size, in bits. The default is 2048. It is used if the
-new
option is used and can be overridden by using the-newkey
option. default_keyfile
- The default file to write a private key to, or standard output if not
specified. It can be overridden by the
-keyout
option. default_md
- The digest algorithm to use. Possible values include
md5
,sha1
andsha256
(the default). It can be overridden on the command line. distinguished_name
- The section containing the distinguished name fields to prompt for when generating a certificate or certificate request. The format is described below.
encrypt_key
- If set to "no" and a private key is generated, it is not
encrypted. It is equivalent to the
-nodes
option. For compatibility,encrypt_rsa_key
is an equivalent option. input_password
|output_password
- The passwords for the input private key file (if present) and the output
private key file (if one will be created). The command line options
-passin
and-passout
override the configuration file values. oid_file
- A file containing additional OBJECT IDENTIFIERS. Each line of the file should consist of the numerical form of the object identifier, followed by whitespace, then the short name followed by whitespace and finally the long name.
oid_section
- Specify a section in the configuration file containing extra object identifiers. Each line should consist of the short name of the object identifier followed by ‘=’ and the numerical form. The short and long names are the same when this option is used.
prompt
- If set to "no", it disables prompting of certificate fields and
just takes values from the config file directly. It also changes the
expected format of the
distinguished_name
andattributes
sections. req_extensions
- The configuration file section containing a list of extensions to add to
the certificate request. It can be overridden by the
-reqexts
option. string_mask
- Limit the string types for encoding certain fields. The following values
may be used, limiting strings to the indicated types:
utf8only
- UTF8String. This is the default, as recommended by PKIX in RFC 2459.
default
- PrintableString, IA5String, T61String, BMPString, UTF8String.
pkix
- PrintableString, IA5String, BMPString, UTF8String. Inspired by the PKIX recommendation in RFC 2459 for certificates generated before 2004, but differs by also permitting IA5String.
nombstr
- PrintableString, IA5String, T61String, UniversalString. A workaround for some ancient software that had problems with the variable-sized BMPString and UTF8String types.
MASK
:number- An explicit bitmask of permitted types, where
number is a C-style hex, decimal, or octal
number that's a bit-wise OR of
B_ASN1_*
values from<openssl/asn1.h>
.
utf8
- If set to "yes", field values are interpreted as UTF8 strings.
x509_extensions
- The configuration file section containing a list of extensions to add to a
certificate generated when the
-x509
switch is used. It can be overridden by the-extensions
command line switch.
There are two separate formats for the distinguished name and
attribute sections. If the -prompt
option is set to
"no", then these sections just consist of field names and values.
If the -prompt
option is absent or not set to
"no", then the file contains field prompting information of the
form:
fieldName="prompt" fieldName_default="default field value" fieldName_min= 2 fieldName_max= 4
"fieldName" is the field name being used, for example
commonName
(or CN). The "prompt" string is
used to ask the user to enter the relevant details. If the user enters
nothing, the default value is used; if no default value is present, the
field is omitted. A field can still be omitted if a default value is
present, if the user just enters the ‘.’ character.
The number of characters entered must be between the fieldName_min
and fieldName_max limits: there may be additional restrictions based on the
field being used (for example countryName
can only
ever be two characters long and must fit in a
PrintableString
).
Some fields (such as organizationName
) can
be used more than once in a DN. This presents a problem because
configuration files will not recognize the same name occurring twice. To
avoid this problem, if the fieldName
contains some
characters followed by a full stop, they will be ignored. So, for example, a
second organizationName
can be input by calling it
"1.organizationName".
The actual permitted field names are any object identifier short
or long names. These are compiled into openssl
and
include the usual values such as commonName
,
countryName
, localityName
,
organizationName
,
organizationUnitName
,
stateOrProvinceName
. Additionally,
emailAddress
is included as well as
name
, surname
,
givenName
, initials
and
dnQualifier
.
Additional object identifiers can be defined with the
oid_file
or oid_section
options in the configuration file. Any additional fields will be treated as
though they were a DirectoryString
.
RSA
openssl rsa |
[-aes128 | -aes192 |
-aes256 | -des |
-des3 ] [-check ]
[-in file]
[-inform der |
net | pem ]
[-modulus ] [-noout ]
[-out file]
[-outform der |
net | pem ]
[-passin arg]
[-passout arg]
[-pubin ] [-pubout ]
[-sgckey ] [-text ] |
The rsa
command processes RSA keys. They
can be converted between various forms and their components printed out.
rsa
uses the traditional
SSLeay
compatible format for private key encryption:
newer applications should use the more secure PKCS#8 format using the
pkcs8
utility.
The options are as follows:
-aes128
|-aes192
|-aes256
|-des
|-des3
- Encrypt the private key with the AES, DES, or the triple DES ciphers,
respectively, before outputting it. A pass phrase is prompted for. If none
of these options are specified, the key is written in plain text. This
means that using the
rsa
utility to read in an encrypted key with no encryption option can be used to remove the pass phrase from a key, or by setting the encryption options it can be used to add or change the pass phrase. These options can only be used with PEM format output files. -check
- Check the consistency of an RSA private key.
-in
file- The input file to read from, or standard input if not specified. If the key is encrypted, a pass phrase will be prompted for.
-inform
der
|net
|pem
- The input format.
-noout
- Do not output the encoded version of the key.
-modulus
- Print the value of the modulus of the key.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|net
|pem
- The output format.
-passin
arg- The key password source.
-passout
arg- The output file password source.
-pubin
- Read in a public key, not a private key.
-pubout
- Output a public key, not a private key. Automatically set if the input is a public key.
-sgckey
- Use the modified NET algorithm used with some versions of Microsoft IIS and SGC keys.
-text
- Print the public/private key components in plain text.
RSAUTL
openssl rsautl |
[-asn1parse ] [-certin ]
[-decrypt ] [-encrypt ]
[-hexdump ] [-in
file] [-inkey
file] [-keyform
der | pem ]
[-oaep | -pkcs |
-raw | -ssl ]
[-out file]
[-pubin ] [-sign ]
[-verify ] |
The rsautl
command can be used to sign,
verify, encrypt and decrypt data using the RSA algorithm.
The options are as follows:
-asn1parse
- Asn1parse the output data; this is useful when combined with the
-verify
option. -certin
- The input is a certificate containing an RSA public key.
-decrypt
- Decrypt the input data using an RSA private key.
-encrypt
- Encrypt the input data using an RSA public key.
-hexdump
- Hex dump the output data.
-in
file- The input to read from, or standard input if not specified.
-inkey
file- The input key file; by default an RSA private key.
-keyform
der
|pem
- The private ket format. The default is
pem
. -oaep
|-pkcs
|-raw
|-ssl
- The padding to use: PKCS#1 OAEP, PKCS#1 v1.5 (the default), or no padding,
respectively. For signatures, only
-pkcs
and-raw
can be used. -out
file- The output file to write to, or standard output if not specified.
-pubin
- The input file is an RSA public key.
-sign
- Sign the input data and output the signed result. This requires an RSA private key.
-verify
- Verify the input data and output the recovered data.
S_CLIENT
openssl s_client |
[-4 | -6 ]
[-bugs ] [-CAfile
file] [-CApath
directory] [-cert
file] [-check_ss_sig ]
[-cipher cipherlist]
[-connect
host[:port]]
[-crl_check ]
[-crl_check_all ] [-crlf ]
[-debug ] [-extended_crl ]
[-ign_eof ]
[-ignore_critical ]
[-issuer_checks ] [-key
keyfile] [-msg ]
[-nbio ] [-nbio_test ]
[-no_ticket ] [-no_tls1 ]
[-no_tls1_1 ] [-no_tls1_2 ]
[-pause ] [-policy_check ]
[-prexit ] [-proxy
host:port]
[-psk key]
[-psk_identity identity]
[-quiet ] [-reconnect ]
[-servername name]
[-showcerts ] [-starttls
protocol] [-state ]
[-tls1 ] [-tls1_1 ]
[-tls1_2 ] [-tlsextdebug ]
[-verify depth]
[-x509_strict ] [-xmpphost
host] |
The s_client
command implements a generic
SSL/TLS client which connects to a remote host using SSL/TLS.
If a connection is established with an SSL server, any data
received from the server is displayed and any key presses will be sent to
the server. When used interactively (which means neither
-quiet
nor -ign_eof
have
been given), the session will be renegotiated if the line begins with an
R
; if the line begins with a
Q
or if end of file is reached, the connection will
be closed down.
The options are as follows:
-4
- Attempt connections using IPv4 only.
-6
- Attempt connections using IPv6 only.
-bugs
- Enable various workarounds for buggy implementations.
-CAfile
file- A file containing trusted certificates to use during server authentication and to use when attempting to build the client certificate chain.
-CApath
directory- The directory to use for server certificate
verification. This directory must be in "hash format"; see
-verify
for more information. These are also used when building the client certificate chain. -cert
file- The certificate to use, if one is requested by the server. The default is not to use a certificate.
-check_ss_sig
,-crl_check
,-crl_check_all
,-extended_crl
,-ignore_critical
,-issuer_checks
,-policy_check
,-x509_strict
- Set various certificate chain validation options. See the
verify
command for details. -cipher
cipherlist- Modify the cipher list sent by the client. Although the server determines
which cipher suite is used, it should take the first supported cipher in
the list sent by the client. See the
ciphers
command for more information. -connect
host[:port]- The host and port to connect to. If not specified, an attempt is made to connect to the local host on port 4433. Alternatively, the host and port pair may be separated using a forward-slash character, which is useful for numeric IPv6 addresses.
-crlf
- Translate a line feed from the terminal into CR+LF, as required by some servers.
-debug
- Print extensive debugging information, including a hex dump of all traffic.
-ign_eof
- Inhibit shutting down the connection when end of file is reached in the input.
-key
keyfile- The private key to use. If not specified, the certificate file will be used.
-msg
- Show all protocol messages with hex dump.
-nbio
- Turn on non-blocking I/O.
-nbio_test
- Test non-blocking I/O.
-no_tls1
|-no_tls1_1
|-no_tls1_2
- Disable the use of TLS1.0, 1.1, and 1.2, respectively.
-no_ticket
- Disable RFC 4507 session ticket support.
-pause
- Pause 1 second between each read and write call.
-prexit
- Print session information when the program exits. This will always attempt to print out information even if the connection fails. Normally, information will only be printed out once if the connection succeeds. This option is useful because the cipher in use may be renegotiated or the connection may fail because a client certificate is required or is requested only after an attempt is made to access a certain URL. Note that the output produced by this option is not always accurate because a connection might never have been established.
-proxy
host:port- Use the HTTP proxy at host and
port. The connection to the proxy is done in
cleartext and the
-connect
argument is given to the proxy. If not specified, localhost is used as final destination. After that, switch the connection through the proxy to the destination to TLS. -psk
key- Use the PSK key key when using a PSK cipher suite. The key is given as a hexadecimal number without the leading 0x, for example -psk 1a2b3c4d.
-psk_identity
identity- Use the PSK identity when using a PSK cipher suite.
-quiet
- Inhibit printing of session and certificate information. This implicitly
turns on
-ign_eof
as well. -reconnect
- Reconnect to the same server 5 times using the same session ID; this can be used as a test that session caching is working.
-servername
name- Include the TLS Server Name Indication (SNI) extension in the ClientHello message, using the specified server name.
-showcerts
- Display the whole server certificate chain: normally only the server certificate itself is displayed.
-starttls
protocol- Send the protocol-specific messages to switch to TLS for communication. protocol is a keyword for the intended protocol. Currently, the supported keywords are "ftp", "imap", "smtp", "pop3", and "xmpp".
-state
- Print the SSL session states.
-tls1
|-tls1_1
|-tls1_2
- Permit only TLS1.0, 1.1, or 1.2, respectively.
-tlsextdebug
- Print a hex dump of any TLS extensions received from the server.
-verify
depth- Turn on server certificate verification, with a maximum length of depth. Currently the verify operation continues after errors so all the problems with a certificate chain can be seen. As a side effect the connection will never fail due to a server certificate verify failure.
-xmpphost
hostname- When used with
-starttls
xmpp, specify the host for the "to" attribute of the stream element. If this option is not specified then the host specified with-connect
will be used.
S_SERVER
openssl s_server |
[-accept port]
[-bugs ] [-CAfile
file] [-CApath
directory] [-cert
file] [-cipher
cipherlist] [-context
id] [-crl_check ]
[-crl_check_all ] [-crlf ]
[-dcert file]
[-debug ] [-dhparam
file] [-dkey
file] [-hack ]
[-HTTP ] [-id_prefix
arg] [-key
keyfile] [-msg ]
[-nbio ] [-nbio_test ]
[-no_dhe ] [-no_tls1 ]
[-no_tls1_1 ] [-no_tls1_2 ]
[-no_tmp_rsa ] [-nocert ]
[-psk key]
[-psk_hint hint]
[-quiet ] [-serverpref ]
[-state ] [-tls1 ]
[-tls1_1 ] [-tls1_2 ]
[-Verify depth]
[-verify depth]
[-WWW ] [-www ] |
The s_server
command implements a generic
SSL/TLS server which listens for connections on a given port using
SSL/TLS.
If a connection request is established with a client and neither
the -www
nor the -WWW
option
has been used, then any data received from the client is displayed and any
key presses are sent to the client. Certain single letter commands perform
special operations:
P
- Send plain text, which should cause the client to disconnect.
Q
- End the current SSL connection and exit.
q
- End the current SSL connection, but still accept new connections.
R
- Renegotiate the SSL session and request a client certificate.
r
- Renegotiate the SSL session.
S
- Print out some session cache status information.
The options are as follows:
-accept
port- Listen on TCP port for connections. The default is port 4433.
-bugs
- Enable various workarounds for buggy implementations.
-CAfile
file- A file containing trusted certificates to use during client authentication and to use when attempting to build the server certificate chain. The list is also used in the list of acceptable client CAs passed to the client when a certificate is requested.
-CApath
directory- The directory to use for client certificate
verification. This directory must be in "hash format"; see
-verify
for more information. These are also used when building the server certificate chain. -cert
file- The certificate to use: most server's cipher suites require the use of a certificate and some require a certificate with a certain public key type. For example, the DSS cipher suites require a certificate containing a DSS (DSA) key. If not specified, the file server.pem will be used.
-cipher
cipherlist- Modify the cipher list used by the server. This allows the cipher list
used by the server to be modified. When the client sends a list of
supported ciphers, the first client cipher also included in the server
list is used. Because the client specifies the preference order, the order
of the server cipherlist is irrelevant. See the
ciphers
command for more information. -context
id- Set the SSL context ID. It can be given any string value.
-crl_check
,-crl_check_all
- Check the peer certificate has not been revoked by its CA. The CRLs are
appended to the certificate file.
-crl_check_all
checks all CRLs of all CAs in the chain. -crlf
- Translate a line feed from the terminal into CR+LF.
-dcert
file,-dkey
file- Specify an additional certificate and private key; these behave in the
same manner as the
-cert
and-key
options except there is no default if they are not specified (no additional certificate or key is used). By using RSA and DSS certificates and keys, a server can support clients which only support RSA or DSS cipher suites by using an appropriate certificate. -debug
- Print extensive debugging information, including a hex dump of all traffic.
-dhparam
file- The DH parameter file to use. The ephemeral DH cipher suites generate keys
using a set of DH parameters. If not specified, an attempt is made to load
the parameters from the server certificate file. If this fails, a static
set of parameters hard coded into the
s_server
program will be used. -hack
- Enables a further workaround for some early Netscape SSL code.
-HTTP
- Emulate a simple web server. Pages are resolved relative to the current directory. For example if the URL https://myhost/page.html is requested, the file ./page.html will be loaded. The files loaded are assumed to contain a complete and correct HTTP response (lines that are part of the HTTP response line and headers must end with CRLF).
-id_prefix
arg- Generate SSL/TLS session IDs prefixed by arg. This is mostly useful for testing any SSL/TLS code that wish to deal with multiple servers, when each of which might be generating a unique range of session IDs.
-key
keyfile- The private key to use. If not specified, the certificate file will be used.
-msg
- Show all protocol messages with hex dump.
-nbio
- Turn on non-blocking I/O.
-nbio_test
- Test non-blocking I/O.
-no_dhe
- Disable ephemeral DH cipher suites.
-no_tls1
|-no_tls1_1
|-no_tls1_2
- Disable the use of TLS1.0, 1.1, and 1.2, respectively.
-no_tmp_rsa
- Disable temporary RSA key generation.
-nocert
- Do not use a certificate. This restricts the cipher suites available to the anonymous ones (currently just anonymous DH).
-psk
key- Use the PSK key key when using a PSK cipher suite. The key is given as a hexadecimal number without the leading 0x, for example -psk 1a2b3c4d.
-psk_hint
hint- Use the PSK identity hint hint when using a PSK cipher suite.
-quiet
- Inhibit printing of session and certificate information.
-serverpref
- Use server's cipher preferences.
-state
- Print the SSL session states.
-tls1
|-tls1_1
|-tls1_2
- Permit only TLS1.0, 1.1, or 1.2, respectively.
-WWW
- Emulate a simple web server. Pages are resolved relative to the current directory. For example if the URL https://myhost/page.html is requested, the file ./page.html will be loaded.
-www
- Send a status message to the client when it connects, including information about the ciphers used and various session parameters. The output is in HTML format so this option will normally be used with a web browser.
-Verify
depth,-verify
depth- Request a certificate chain from the client, with a maximum length of
depth. With
-Verify
, the client must supply a certificate or an error occurs; with-verify
, a certificate is requested but the client does not have to send one.
S_TIME
openssl s_time |
[-bugs ] [-CAfile
file] [-CApath
directory] [-cert
file] [-cipher
cipherlist] [-connect
host[:port]]
[-key keyfile]
[-nbio ] [-new ]
[-no_shutdown ] [-reuse ]
[-time seconds]
[-verify depth]
[-www page] |
The s_time
command implements a generic
SSL/TLS client which connects to a remote host using SSL/TLS. It can request
a page from the server and includes the time to transfer the payload data in
its timing measurements. It measures the number of connections within a
given timeframe, the amount of data transferred (if any), and calculates the
average time spent for one connection.
The options are as follows:
-bugs
- Enable various workarounds for buggy implementations.
-CAfile
file- A file containing trusted certificates to use during server authentication and to use when attempting to build the client certificate chain.
-CApath
directory- The directory to use for server certificate verification. This directory
must be in "hash format"; see
verify
for more information. These are also used when building the client certificate chain. -cert
file- The certificate to use, if one is requested by the server. The default is not to use a certificate.
-cipher
cipherlist- Modify the cipher list sent by the client. Although the server determines
which cipher suite is used, it should take the first supported cipher in
the list sent by the client. See the
ciphers
command for more information. -connect
host[:port]- The host and port to connect to.
-key
keyfile- The private key to use. If not specified, the certificate file will be used.
-nbio
- Turn on non-blocking I/O.
-new
- Perform the timing test using a new session ID for each connection. If
neither
-new
nor-reuse
are specified, they are both on by default and executed in sequence. -no_shutdown
- Shut down the connection without sending a "close notify" shutdown alert to the server.
-reuse
- Perform the timing test using the same session ID for each connection. If
neither
-new
nor-reuse
are specified, they are both on by default and executed in sequence. -time
seconds- Limit
s_time
benchmarks to the number of seconds. The default is 30 seconds. -verify
depth- Turn on server certificate verification, with a maximum length of depth. Currently the verify operation continues after errors, so all the problems with a certificate chain can be seen. As a side effect, the connection will never fail due to a server certificate verify failure.
-www
page- The page to GET from the server. A value of ‘/’ gets the
index.htm[l] page. If this parameter is not specified,
s_time
will only perform the handshake to establish SSL connections but not transfer any payload data.
SESS_ID
openssl sess_id |
[-cert ] [-context
ID] [-in
file] [-inform
der | pem ]
[-noout ] [-out
file] [-outform
der | pem ]
[-text ] |
The sess_id
program processes the encoded
version of the SSL session structure and optionally prints out SSL session
details (for example the SSL session master key) in human-readable
format.
The options are as follows:
-cert
- If a certificate is present in the session, it will be output using this
option; if the
-text
option is also present, then it will be printed out in text form. -context
ID- Set the session ID. The ID can be any string of characters.
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|pem
- The input format.
der
uses an ASN.1 DER-encoded format containing session details. The precise format can vary from one version to the next.pem
is the default format: it consists of the DER format base64-encoded with additional header and footer lines. -noout
- Do not output the encoded version of the session.
-out
file- The output file to write to, or standard output if not specified.
-outform
der
|pem
- The output format.
-text
- Print the various public or private key components in plain text, in addition to the encoded version.
The output of sess_id
is composed as
follows:
- Protocol
- The protocol in use.
- Cipher
- The actual raw SSL or TLS cipher code.
- Session-ID
- The SSL session ID, in hex format.
- Session-ID-ctx
- The session ID context, in hex format.
- Master-Key
- The SSL session master key.
- Key-Arg
- The key argument; this is only used in SSL v2.
- Start Time
- The session start time. UNIX format.
- Timeout
- The timeout, in seconds.
- Verify return code
- The return code when a certificate is verified.
Since the SSL session output contains the master key, it is possible to read the contents of an encrypted session using this information. Therefore appropriate security precautions should be taken if the information is being output by a "real" application. This is, however, strongly discouraged and should only be used for debugging purposes.
SMIME
openssl smime |
[-aes128 | -aes192 |
-aes256 | -des |
-des3 | -rc2-40 |
-rc2-64 | -rc2-128 ]
[-binary ] [-CAfile
file] [-CApath
directory] [-certfile
file] [-check_ss_sig ]
[-content file]
[-crl_check ]
[-crl_check_all ]
[-decrypt ] [-encrypt ]
[-extended_crl ] [-from
addr] [-ignore_critical ]
[-in file]
[-indef ] [-inform
der | pem |
smime ] [-inkey
file] [-issuer_checks ]
[-keyform pem ]
[-md digest]
[-noattr ] [-nocerts ]
[-nochain ] [-nodetach ]
[-noindef ] [-nointern ]
[-nosigs ] [-noverify ]
[-out file]
[-outform der |
pem | smime ]
[-passin arg]
[-pk7out ] [-policy_check ]
[-recip file]
[-resign ] [-sign ]
[-signer file]
[-stream ] [-subject
s] [-text ]
[-to addr]
[-verify ] [-x509_strict ]
[cert.pem ...] |
The smime
command handles S/MIME mail. It
can encrypt, decrypt, sign, and verify S/MIME messages.
The MIME message must be sent without any blank lines between the headers and the output. Some mail programs will automatically add a blank line. Piping the mail directly to an MTA is one way to achieve the correct format.
The supplied message to be signed or encrypted must include the
necessary MIME headers or many S/MIME clients won't display it properly (if
at all). Use the -text
option to automatically add
plain text headers.
A "signed and encrypted" message is one where a signed message is then encrypted. This can be produced by encrypting an already signed message.
There are a number of operations that can be performed, as follows:
-decrypt
- Decrypt mail using the supplied certificate and private key. The input file is an encrypted mail message in MIME format. The decrypted mail is written to the output file.
-encrypt
- Encrypt mail for the given recipient certificates. The input is the message to be encrypted. The output file is the encrypted mail, in MIME format.
-pk7out
- Take an input message and write out a PEM-encoded PKCS#7 structure.
-resign
- Resign a message: take an existing message and one or more new signers.
-sign
- Sign mail using the supplied certificate and private key. The input file is the message to be signed. The signed message, in MIME format, is written to the output file.
-verify
- Verify signed mail. The input is a signed mail message and the output is the signed data. Both clear text and opaque signing is supported.
The remaining options are as follows:
-aes128
|-aes192
|-aes256
|-des
|-des3
|-rc2-40
|-rc2-64
|-rc2-128
- The encryption algorithm to use. 128-, 192-, or 256-bit AES, DES (56
bits), triple DES (168 bits), or 40-, 64-, or 128-bit RC2, respectively;
if not specified, 40-bit RC2 is used. Only used with
-encrypt
. -binary
- Normally, the input message is converted to "canonical" format which uses CR/LF as end of line, as required by the S/MIME specification. When this option is present no translation occurs. This is useful when handling binary data which may not be in MIME format.
-CAfile
file- A file containing trusted CA certificates; only used
with
-verify
. -CApath
directory- A directory containing trusted CA certificates; only
used with
-verify
. This directory must be a standard certificate directory: that is, a hash of each subject name (usingx509 -hash
) should be linked to each certificate. - cert.pem ...
- One or more certificates of message recipients: used when encrypting a message.
-certfile
file- Allows additional certificates to be specified. When signing, these will be included with the message. When verifying, these will be searched for the signers' certificates. The certificates should be in PEM format.
-check_ss_sig
,-crl_check
,-crl_check_all
,-extended_crl
,-ignore_critical
,-issuer_checks
,-policy_check
,-x509_strict
- Set various certificate chain validation options. See the
verify
command for details. -content
file- A file containing the detached content. This is only useful with the
-verify
option, and only usable if the PKCS#7 structure is using the detached signature form where the content is not included. This option will override any content if the input format is S/MIME and it uses the multipart/signed MIME content type. -from
addr,-subject
s,-to
addr- The relevant mail headers. These are included outside the signed portion of a message so they may be included manually. When signing, many S/MIME mail clients check that the signer's certificate email address matches the From: address.
-in
file- The input file to read from.
-indef
- Enable streaming I/O for encoding operations. This permits single pass processing of data without the need to hold the entire contents in memory, potentially supporting very large files. Streaming is automatically set for S/MIME signing with detached data if the output format is SMIME; it is currently off by default for all other operations.
-inform
der
|pem
|smime
- The input format.
-inkey
file- The private key to use when signing or decrypting, which must match the
corresponding certificate. If this option is not specified, the private
key must be included in the certificate file specified with the
-recip
or-signer
file. When signing, this option can be used multiple times to specify successive keys. -keyform
pem
- Input private key format.
-md
digest- The digest algorithm to use when signing or resigning. If not present then the default digest algorithm for the signing key is used (usually SHA1).
-noattr
- Do not include attributes.
-nocerts
- Do not include the signer's certificate. This will reduce the size of the
signed message but the verifier must have a copy of the signer's
certificate available locally (passed using the
-certfile
option, for example). -nochain
- Do not do chain verification of signers' certificates: that is, don't use the certificates in the signed message as untrusted CAs.
-nodetach
- When signing a message use opaque signing: this form is more resistant to translation by mail relays but it cannot be read by mail agents that do not support S/MIME. Without this option cleartext signing with the MIME type multipart/signed is used.
-noindef
- Disable streaming I/O where it would produce an encoding of indefinite length (currently has no effect).
-nointern
- Only use certificates specified in the
-certfile
. The supplied certificates can still be used as untrusted CAs. -nosigs
- Do not try to verify the signatures on the message.
-noverify
- Do not verify the signer's certificate of a signed message.
-out
file- The output file to write to.
-outform
der
|pem
|smime
- The output format. The default is smime, which writes an S/MIME format
message.
pem
andder
change this to write PEM and DER format PKCS#7 structures instead. This currently only affects the output format of the PKCS#7 structure; if no PKCS#7 structure is being output (for example with-verify
or-decrypt
) this option has no effect. -passin
arg- The key password source.
-recip
file- The recipients certificate when decrypting a message. This certificate must match one of the recipients of the message or an error occurs.
-signer
file- A signing certificate when signing or resigning a message; this option can be used multiple times if more than one signer is required. If a message is being verified, the signer's certificates will be written to this file if the verification was successful.
-stream
- The same as
-indef
. -text
- Add plain text (text/plain) MIME headers to the supplied message if encrypting or signing. If decrypting or verifying, it strips off text headers: if the decrypted or verified message is not of MIME type text/plain then an error occurs.
The exit codes for smime
are as
follows:
- 0
- The operation was completely successful.
- 1
- An error occurred parsing the command options.
- 2
- One of the input files could not be read.
- 3
- An error occurred creating the file or when reading the message.
- 4
- An error occurred decrypting or verifying the message.
- 5
- An error occurred writing certificates.
SPEED
openssl speed |
[algorithm] [-decrypt ]
[-elapsed ] [-evp
algorithm] [-mr ]
[-multi number] |
The speed
command is used to test the
performance of cryptographic algorithms.
- algorithm
- Perform the test using algorithm. The default is to test all algorithms.
-decrypt
- Time decryption instead of encryption; must be used with
-evp
. -elapsed
- Measure time in real time instead of CPU user time.
-evp
algorithm- Perform the test using one of the algorithms accepted by EVP_get_cipherbyname(3).
-mr
- Produce machine readable output.
-multi
number- Run number benchmarks in parallel.
SPKAC
openssl spkac |
[-challenge string]
[-in file]
[-key keyfile]
[-noout ] [-out
file] [-passin
arg] [-pubkey ]
[-spkac spkacname]
[-spksect section]
[-verify ] |
The spkac
command processes signed public
key and challenge (SPKAC) files. It can print out their contents, verify the
signature, and produce its own SPKACs from a supplied private key.
The options are as follows:
-challenge
string- The challenge string, if an SPKAC is being created.
-in
file- The input file to read from, or standard input if not specified. Ignored
if the
-key
option is used. -key
keyfile- Create an SPKAC file using the private key in
keyfile. The
-in
,-noout
,-spksect
, and-verify
options are ignored, if present. -noout
- Do not output the text version of the SPKAC.
-out
file- The output file to write to, or standard output if not specified.
-passin
arg- The key password source.
-pubkey
- Output the public key of an SPKAC.
-spkac
spkacname- An alternative name for the variable containing the SPKAC. The default is "SPKAC". This option affects both generated and input SPKAC files.
-spksect
section- An alternative name for the section containing the SPKAC.
-verify
- Verify the digital signature on the supplied SPKAC.
TS
openssl ts |
-query [-md4 |
-md5 | -ripemd160 |
-sha1 ] [-cert ]
[-config configfile]
[-data file_to_hash]
[-digest digest_bytes]
[-in request.tsq]
[-no_nonce ] [-out
request.tsq] [-policy
object_id] [-text ] |
openssl ts |
-reply [-chain
certs_file.pem] [-config
configfile] [-in
response.tsr] [-inkey
private.pem] [-out
response.tsr] [-passin
arg] [-policy
object_id] [-queryfile
request.tsq] [-section
tsa_section] [-signer
tsa_cert.pem] [-text ]
[-token_in ]
[-token_out ] |
openssl ts |
-verify [-CAfile
trusted_certs.pem] [-CApath
trusted_cert_path] [-data
file_to_hash] [-digest
digest_bytes] [-in
response.tsr] [-queryfile
request.tsq] [-token_in ]
[-untrusted
cert_file.pem] |
The ts
command is a basic Time Stamping
Authority (TSA) client and server application as specified in RFC 3161
(Time-Stamp Protocol, TSP). A TSA can be part of a PKI deployment and its
role is to provide long term proof of the existence of specific data. Here
is a brief description of the protocol:
- The TSA client computes a one-way hash value for a data file and sends the hash to the TSA.
- The TSA attaches the current date and time to the received hash value, signs them and sends the time stamp token back to the client. By creating this token the TSA certifies the existence of the original data file at the time of response generation.
- The TSA client receives the time stamp token and verifies the signature on it. It also checks if the token contains the same hash value that it had sent to the TSA.
There is one DER-encoded protocol data unit defined for
transporting a time stamp request to the TSA and one for sending the time
stamp response back to the client. The ts
command
has three main functions: creating a time stamp request based on a data
file; creating a time stamp response based on a request; and verifying if a
response corresponds to a particular request or a data file.
There is no support for sending the requests/responses automatically over HTTP or TCP yet as suggested in RFC 3161. Users must send the requests either by FTP or email.
The -query
switch can be used for creating
and printing a time stamp request with the following options:
-cert
- Expect the TSA to include its signing certificate in the response.
-config
configfile- Specify an alternative configuration file. Only the OID section is used.
-data
file_to_hash- The data file for which the time stamp request needs to be created. The default is standard input.
-digest
digest_bytes- Specify the message imprint explicitly without the data file. The imprint must be specified in a hexadecimal format, two characters per byte, the bytes optionally separated by colons. The number of bytes must match the message digest algorithm in use.
-in
request.tsq- A previously created time stamp request in DER format that will be printed into the output file. Useful for examining the content of a request in human-readable format.
-md4
|-md5
|-ripemd160
|-sha
|-sha1
- The message digest to apply to the data file. It supports all the message
digest algorithms that are supported by the
dgst
command. The default is SHA-1. -no_nonce
- Specify no nonce in the request. The default, to include a 64-bit long pseudo-random nonce, is recommended to protect against replay attacks.
-out
request.tsq- The output file to write to, or standard output if not specified.
-policy
object_id- The policy that the client expects the TSA to use for creating the time stamp token. Either dotted OID notation or OID names defined in the config file can be used. If no policy is requested the TSA uses its own default policy.
-text
- Output in human-readable text format instead of DER.
A time stamp response (TimeStampResp) consists of a response
status and the time stamp token itself (ContentInfo), if the token
generation was successful. The -reply
command is for
creating a time stamp response or time stamp token based on a request and
printing the response/token in human-readable format. If
-token_out
is not specified the output is always a
time stamp response (TimeStampResp), otherwise it is a time stamp token
(ContentInfo).
-chain
certs_file.pem- The collection of PEM certificates that will be included in the response
in addition to the signer certificate if the
-cert
option was used for the request. This file is supposed to contain the certificate chain for the signer certificate from its issuer upwards. The-reply
command does not build a certificate chain automatically. -config
configfile- Specify an alternative configuration file.
-in
response.tsr- Specify a previously created time stamp response (or time stamp token, if
-token_in
is also specified) in DER format that will be written to the output file. This option does not require a request; it is useful, for example, to examine the content of a response or token or to extract the time stamp token from a response. If the input is a token and the output is a time stamp response a default "granted" status info is added to the token. -inkey
private.pem- The signer private key of the TSA in PEM format. Overrides the
signer_key
config file option. -out
response.tsr- The response is written to this file. The format and content of the file
depends on other options (see
-text
and-token_out
). The default is stdout. -passin
arg- The key password source.
-policy
object_id- The default policy to use for the response. Either dotted OID notation or OID names defined in the config file can be used. If no policy is requested the TSA uses its own default policy.
-queryfile
request.tsq- The file containing a DER-encoded time stamp request.
-section
tsa_section- The config file section containing the settings for response generation.
-signer
tsa_cert.pem- The PEM signer certificate of the TSA. The TSA signing certificate must
have exactly one extended key usage assigned to it: timeStamping. The
extended key usage must also be critical, otherwise the certificate is
going to be refused. Overrides the
signer_cert
variable of the config file. -text
- Output in human-readable text format instead of DER.
-token_in
- The input is a DER-encoded time stamp token (ContentInfo) instead of a time stamp response (TimeStampResp).
-token_out
- The output is a time stamp token (ContentInfo) instead of a time stamp response (TimeStampResp).
The -verify
command is for verifying if a
time stamp response or time stamp token is valid and matches a particular
time stamp request or data file. The -verify
command
does not use the configuration file.
-CAfile
trusted_certs.pem- The file containing a set of trusted self-signed PEM CA certificates. See
verify
for additional details. Either this option or-CApath
must be specified. -CApath
trusted_cert_path- The directory containing the trused CA certificates of the client. See
verify
for additional details. Either this option or-CAfile
must be specified. -data
file_to_hash- The response or token must be verified against
file_to_hash. The file is hashed with the message
digest algorithm specified in the token. The
-digest
and-queryfile
options must not be specified with this one. -digest
digest_bytes- The response or token must be verified against the message digest
specified with this option. The number of bytes must match the message
digest algorithm specified in the token. The
-data
and-queryfile
options must not be specified with this one. -in
response.tsr- The time stamp response that needs to be verified, in DER format. This option in mandatory.
-queryfile
request.tsq- The original time stamp request, in DER format. The
-data
and-digest
options must not be specified with this one. -token_in
- The input is a DER-encoded time stamp token (ContentInfo) instead of a time stamp response (TimeStampResp).
-untrusted
cert_file.pem- Additional untrusted PEM certificates which may be needed when building the certificate chain for the TSA's signing certificate. This file must contain the TSA signing certificate and all intermediate CA certificates unless the response includes them.
Options specified on the command line always override the settings in the config file:
tsa
section,default_tsa
- This is the main section and it specifies the name of another section that
contains all the options for the
-reply
option. This section can be overridden with the-section
command line switch. oid_file
- See
ca
for a description. oid_section
- See
ca
for a description. serial
- The file containing the hexadecimal serial number of the last time stamp response created. This number is incremented by 1 for each response. If the file does not exist at the time of response generation a new file is created with serial number 1. This parameter is mandatory.
signer_cert
- TSA signing certificate, in PEM format. The same as the
-signer
command line option. certs
- A set of PEM-encoded certificates that need to be included in the
response. The same as the
-chain
command line option. signer_key
- The private key of the TSA, in PEM format. The same as the
-inkey
command line option. default_policy
- The default policy to use when the request does not mandate any policy.
The same as the
-policy
command line option. other_policies
- Comma separated list of policies that are also acceptable by the TSA and used only if the request explicitly specifies one of them.
digests
- The list of message digest algorithms that the TSA accepts. At least one algorithm must be specified. This parameter is mandatory.
accuracy
- The accuracy of the time source of the TSA in seconds, milliseconds and microseconds. For example, secs:1, millisecs:500, microsecs:100. If any of the components is missing, zero is assumed for that field.
clock_precision_digits
- The maximum number of digits, which represent the fraction of seconds, that need to be included in the time field. The trailing zeroes must be removed from the time, so there might actually be fewer digits or no fraction of seconds at all. The maximum value is 6; the default is 0.
ordering
- If this option is yes, the responses generated by this TSA can always be ordered, even if the time difference between two responses is less than the sum of their accuracies. The default is no.
tsa_name
- Set this option to yes if the subject name of the TSA must be included in the TSA name field of the response. The default is no.
ess_cert_id_chain
- The SignedData objects created by the TSA always contain the certificate
identifier of the signing certificate in a signed attribute (see RFC 2634,
Enhanced Security Services). If this option is set to yes and either the
certs
variable or the-chain
option is specified then the certificate identifiers of the chain will also be included in the SigningCertificate signed attribute. If this variable is set to no, only the signing certificate identifier is included. The default is no.
VERIFY
openssl verify |
[-CAfile file]
[-CApath directory]
[-check_ss_sig ]
[-crl_check ]
[-crl_check_all ]
[-explicit_policy ]
[-extended_crl ] [-help ]
[-ignore_critical ]
[-inhibit_any ]
[-inhibit_map ]
[-issuer_checks ]
[-policy_check ] [-purpose
purpose] [-untrusted
file] [-verbose ]
[-x509_strict ]
[certificates] |
The verify
command verifies certificate
chains.
The options are as follows:
-check_ss_sig
- Verify the signature on the self-signed root CA. This is disabled by default because it doesn't add any security.
-CAfile
file- A file of trusted certificates. The file should contain multiple certificates in PEM format, concatenated together.
-CApath
directory- A directory of trusted certificates. The
certificates, or symbolic links to them, should have names of the form
hash.0, where hash is the
hashed certificate subject name (see the
-hash
option of thex509
utility). -crl_check
- Check end entity certificate validity by attempting to look up a valid CRL. If a valid CRL cannot be found an error occurs.
-crl_check_all
- Check the validity of all certificates in the chain by attempting to look up valid CRLs.
-explicit_policy
- Set policy variable require-explicit-policy (RFC 3280).
-extended_crl
- Enable extended CRL features such as indirect CRLs and alternate CRL signing keys.
-help
- Print a usage message.
-ignore_critical
- Ignore critical extensions instead of rejecting the certificate.
-inhibit_any
- Set policy variable inhibit-any-policy (RFC 3280).
-inhibit_map
- Set policy variable inhibit-policy-mapping (RFC 3280).
-issuer_checks
- Print diagnostics relating to searches for the issuer certificate of the current certificate showing why each candidate issuer certificate was rejected. The presence of rejection messages does not itself imply that anything is wrong: during the normal verify process several rejections may take place.
-policy_check
- Enable certificate policy processing.
-purpose
purpose- The intended use for the certificate. Without this option no chain
verification will be done. Currently accepted uses are
sslclient
,sslserver
,nssslserver
,smimesign
,smimeencrypt
,crlsign
,any
, andocsphelper
. -untrusted
file- A file of untrusted certificates. The file should contain multiple certificates.
-verbose
- Print extra information about the operations being performed.
-x509_strict
- Disable workarounds for broken certificates which have to be disabled for strict X.509 compliance.
- certificates
- One or more PEM certificates to verify. If no certificate files are included, an attempt is made to read a certificate from standard input. If the first certificate filename begins with a dash, use a lone dash to mark the last option.
The verify
program uses the same functions
as the internal SSL and S/MIME verification, with one crucial difference:
wherever possible an attempt is made to continue after an error, whereas
normally the verify operation would halt on the first error. This allows all
the problems with a certificate chain to be determined.
The verify operation consists of a number of separate steps. Firstly a certificate chain is built up starting from the supplied certificate and ending in the root CA. It is an error if the whole chain cannot be built up. The chain is built up by looking up the issuer's certificate of the current certificate. If a certificate is found which is its own issuer, it is assumed to be the root CA.
All certificates whose subject name matches the issuer name of the
current certificate are subject to further tests. The relevant authority key
identifier components of the current certificate (if present) must match the
subject key identifier (if present) and issuer and serial number of the
candidate issuer; in addition the keyUsage
extension
of the candidate issuer (if present) must permit certificate signing.
The lookup first looks in the list of untrusted certificates and if no match is found the remaining lookups are from the trusted certificates. The root CA is always looked up in the trusted certificate list: if the certificate to verify is a root certificate, then an exact match must be found in the trusted list.
The second operation is to check every untrusted certificate's
extensions for consistency with the supplied purpose. If the
-purpose
option is not included, then no checks are
done. The supplied or "leaf" certificate must have extensions
compatible with the supplied purpose and all other certificates must also be
valid CA certificates. The precise extensions required are described in more
detail in the X509
section below.
The third operation is to check the trust settings on the root CA. The root CA should be trusted for the supplied purpose. A certificate with no trust settings is considered to be valid for all purposes.
The final operation is to check the validity of the certificate
chain. The validity period is checked against the current system time and
the notBefore
and notAfter
dates in the certificate. The certificate signatures are also checked at
this point.
If all operations complete successfully, the certificate is considered valid. If any operation fails then the certificate is not valid. When a verify operation fails, the output messages can be somewhat cryptic. The general form of the error message is:
server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024-bit) error 24 at 1 depth lookup:invalid CA certificate
The first line contains the name of the certificate being verified, followed by the subject name of the certificate. The second line contains the error number and the depth. The depth is the number of the certificate being verified when a problem was detected starting with zero for the certificate being verified itself, then 1 for the CA that signed the certificate and so on. Finally a text version of the error number is presented.
An exhaustive list of the error codes and messages is shown below;
this also includes the name of the error code as defined in the header file
<openssl/x509_vfy.h>
. Some
of the error codes are defined but never returned: these are described as
"unused".
- 0 X509_V_OK
- The operation was successful.
- 2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT
- The issuer certificate of an untrusted certificate could not be found.
- 3 X509_V_ERR_UNABLE_TO_GET_CRL
- The CRL of a certificate could not be found.
- 4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE
- The certificate signature could not be decrypted. This means that the actual signature value could not be determined rather than it not matching the expected value. This is only meaningful for RSA keys.
- 5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE
- The CRL signature could not be decrypted. This means that the actual signature value could not be determined rather than it not matching the expected value. Unused.
- 6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY
- The public key in the certificate
SubjectPublicKeyInfo
could not be read. - 7 X509_V_ERR_CERT_SIGNATURE_FAILURE
- The signature of the certificate is invalid.
- 8 X509_V_ERR_CRL_SIGNATURE_FAILURE
- The signature of the certificate is invalid.
- 9 X509_V_ERR_CERT_NOT_YET_VALID
- The certificate is not yet valid: the
notBefore
date is after the current time. - 10 X509_V_ERR_CERT_HAS_EXPIRED
- The certificate has expired; that is, the
notAfter
date is before the current time. - 11 X509_V_ERR_CRL_NOT_YET_VALID
- The CRL is not yet valid.
- 12 X509_V_ERR_CRL_HAS_EXPIRED
- The CRL has expired.
- 13 X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD
- The certificate
notBefore
field contains an invalid time. - 14 X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD
- The certificate
notAfter
field contains an invalid time. - 15 X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD
- The CRL
lastUpdate
field contains an invalid time. - 16 X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD
- The CRL
nextUpdate
field contains an invalid time. - 17 X509_V_ERR_OUT_OF_MEM
- An error occurred trying to allocate memory. This should never happen.
- 18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT
- The passed certificate is self-signed and the same certificate cannot be found in the list of trusted certificates.
- 19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN
- The certificate chain could be built up using the untrusted certificates but the root could not be found locally.
- 20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY
- The issuer certificate of a locally looked up certificate could not be found. This normally means the list of trusted certificates is not complete.
- 21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE
- No signatures could be verified because the chain contains only one certificate and it is not self-signed.
- 22 X509_V_ERR_CERT_CHAIN_TOO_LONG
- The certificate chain length is greater than the supplied maximum depth. Unused.
- 23 X509_V_ERR_CERT_REVOKED
- The certificate has been revoked.
- 24 X509_V_ERR_INVALID_CA
- A CA certificate is invalid. Either it is not a CA or its extensions are not consistent with the supplied purpose.
- 25 X509_V_ERR_PATH_LENGTH_EXCEEDED
- The
basicConstraints
pathlength parameter has been exceeded. - 26 X509_V_ERR_INVALID_PURPOSE
- The supplied certificate cannot be used for the specified purpose.
- 27 X509_V_ERR_CERT_UNTRUSTED
- The root CA is not marked as trusted for the specified purpose.
- 28 X509_V_ERR_CERT_REJECTED
- The root CA is marked to reject the specified purpose.
- 29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH
- The current candidate issuer certificate was rejected because its subject
name did not match the issuer name of the current certificate. Only
displayed when the
-issuer_checks
option is set. - 30 X509_V_ERR_AKID_SKID_MISMATCH
- The current candidate issuer certificate was rejected because its subject
key identifier was present and did not match the authority key identifier
current certificate. Only displayed when the
-issuer_checks
option is set. - 31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
- The current candidate issuer certificate was rejected because its issuer
name and serial number were present and did not match the authority key
identifier of the current certificate. Only displayed when the
-issuer_checks
option is set. - 32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN
- The current candidate issuer certificate was rejected because its
keyUsage
extension does not permit certificate signing. - 50 X509_V_ERR_APPLICATION_VERIFICATION
- An application specific error. Unused.
VERSION
openssl version
[-abdfopv
]
The version
command is used to print out
version information about openssl
.
The options are as follows:
-a
- All information: this is the same as setting all the other flags.
-b
- The date the current version of
openssl
was built. -d
OPENSSLDIR
setting.-f
- Compilation flags.
-o
- Option information: various options set when the library was built.
-p
- Platform setting.
-v
- The current
openssl
version.
X509
openssl x509 |
[-C ] [-addreject
arg] [-addtrust
arg] [-alias ]
[-CA file]
[-CAcreateserial ] [-CAform
der | pem ]
[-CAkey file]
[-CAkeyform der |
pem ] [-CAserial
file] [-certopt
option] [-checkend
arg] [-clrext ]
[-clrreject ] [-clrtrust ]
[-dates ] [-days
arg] [-email ]
[-enddate ] [-extensions
section] [-extfile
file] [-fingerprint ]
[-hash ] [-in
file] [-inform
der | net |
pem ] [-issuer ]
[-issuer_hash ]
[-issuer_hash_old ]
[-keyform der |
pem ] [-md5 |
-sha1 ] [-modulus ]
[-nameopt option]
[-noout ] [-ocsp_uri ]
[-ocspid ] [-out
file] [-outform
der | net |
pem ] [-passin
arg] [-pubkey ]
[-purpose ] [-req ]
[-serial ] [-set_serial
n] [-setalias
arg] [-signkey
file] [-startdate ]
[-subject ] [-subject_hash ]
[-subject_hash_old ]
[-text ] [-trustout ]
[-x509toreq ] |
The x509
command is a multi-purpose
certificate utility. It can be used to display certificate information,
convert certificates to various forms, sign certificate requests like a
"mini CA", or edit certificate trust settings.
The following are x509 input, output, and general purpose options:
-in
file- The input file to read from, or standard input if not specified.
-inform
der
|net
|pem
- The input format. Normally, the command will expect an X.509 certificate,
but this can change if other options such as
-req
are present. -md5
|-sha1
- The digest to use. This affects any signing or display option that uses a
message digest, such as the
-fingerprint
,-signkey
, and-CA
options. If not specified, MD5 is used. SHA1 is always used with DSA keys. -out
file- The output file to write to, or standard output if none is specified.
-outform
der
|net
|pem
- The output format.
-passin
arg- The key password source.
The following are x509 display options:
-C
- Output the certificate in the form of a C source file.
-certopt
option- Customise the output format used with
-text
, either using a list of comma-separated options or by specifying-certopt
multiple times. The default behaviour is to print all fields. The options are as follows:ca_default
- Equivalent to
no_issuer
,no_pubkey
,no_header
,no_version
,no_sigdump
, andno_signame
. compatible
- Equivalent to no output options at all.
ext_default
- Print unsupported certificate extensions.
ext_dump
- Hex dump unsupported extensions.
ext_error
- Print an error message for unsupported certificate extensions.
ext_parse
- ASN.1 parse unsupported extensions.
no_aux
- Do not print certificate trust information.
no_extensions
- Do not print X509V3 extensions.
no_header
- Do not print header (Certificate and Data) information.
no_issuer
- Do not print the issuer name.
no_pubkey
- Do not print the public key.
no_serial
- Do not print the serial number.
no_sigdump
- Do not give a hexadecimal dump of the certificate signature.
no_signame
- Do not print the signature algorithm used.
no_subject
- Do not print the subject name.
no_validity
- Do not print the
notBefore
andnotAfter
(validity) fields. no_version
- Do not print the version number.
-dates
- Print the start and expiry date of a certificate.
-email
- Output the email addresses, if any.
-enddate
- Print the expiry date of the certificate; that is, the
notAfter
date. -fingerprint
- Print the digest of the DER-encoded version of the whole certificate.
-hash
- A synonym for
-subject_hash
. -issuer
- Print the issuer name.
-issuer_hash
- Print the hash of the certificate issuer name.
-issuer_hash_old
- Print the hash of the certificate issuer name using the older algorithm as
used by
openssl
versions before 1.0.0. -modulus
- Print the value of the modulus of the public key contained in the certificate.
-nameopt
option- Customise how the subject or issuer names are displayed, either using a
list of comma-separated options or by specifying
-nameopt
multiple times. The default behaviour is to use theoneline
format. The options, which can be preceded by a dash to turn them off, are as follows:align
- Align field values for a more readable output. Only usable with sep_multiline.
compat
- Use the old format, equivalent to specifying no options at all.
dn_rev
- Reverse the fields of the DN, as required by RFC 2253. As a side effect, this also reverses the order of multiple AVAs.
dump_all
- Dump all fields. When used with dump_der, it allows the DER encoding of the structure to be unambiguously determined.
dump_der
- Any fields that need to be hexdumped are dumped using the DER encoding of the field. Otherwise just the content octets will be displayed. Both options use the RFC 2253 #XXXX... format.
dump_nostr
- Dump non-character string types (for example OCTET STRING); usually, non-character string types are displayed as though each content octet represents a single character.
dump_unknown
- Dump any field whose OID is not recognised by
openssl
. esc_2253
- Escape the "special" characters required by RFC 2253 in a field that is “ ,+"<>;”. Additionally, ‘#’ is escaped at the beginning of a string and a space character at the beginning or end of a string.
esc_ctrl
- Escape control characters. That is, those with ASCII values less than 0x20 (space) and the delete (0x7f) character. They are escaped using the RFC 2253 \XX notation (where XX are two hex digits representing the character value).
esc_msb
- Escape characters with the MSB set; that is, with ASCII values larger than 127.
multiline
- A multiline format. Equivalent to
esc_ctrl
,esc_msb
,sep_multiline
,space_eq
,lname
, andalign
. no_type
- Do not attempt to interpret multibyte characters. That is, content octets are merely dumped as though one octet represents each character. This is useful for diagnostic purposes but results in rather odd looking output.
nofname
,sname
,lname
,oid
- Alter how the field name is displayed:
nofname
does not display the field at all;sname
uses the short name form (CN forcommonName
, for example);lname
uses the long form.oid
represents the OID in numerical form and is useful for diagnostic purpose. oneline
- A one line format which is more readable than
RFC2253
. Equivalent toesc_2253
,esc_ctrl
,esc_msb
,utf8
,dump_nostr
,dump_der
,use_quote
,sep_comma_plus_spc
,space_eq
, andsname
. RFC2253
- Displays names compatible with RFC 2253. Equivalent to
esc_2253
,esc_ctrl
,esc_msb
,utf8
,dump_nostr
,dump_unknown
,dump_der
,sep_comma_plus
,dn_rev
, andsname
. sep_comma_plus
,sep_comma_plus_space
,sep_semi_plus_space
,sep_multiline
- Determine the field separators: the first character is between RDNs
and the second between multiple AVAs (multiple AVAs are very rare and
their use is discouraged). The options ending in "space"
additionally place a space after the separator to make it more
readable.
sep_multiline
uses a linefeed character for the RDN separator and a spaced ‘+’ for the AVA separator, as well as indenting the fields by four characters. show_type
- Show the type of the ASN.1 character string. The type precedes the field contents. For example "BMPSTRING: Hello World".
space_eq
- Place spaces round the ‘=’ character which follows the field name.
use_quote
- Escape some characters by surrounding the whole string with ‘"’ characters. Without the option, all escaping is done with the ‘\’ character.
utf8
- Convert all strings to UTF8 format first, as required by RFC 2253. On
a UTF8 compatible terminal, the use of this option (and not setting
esc_msb
) may result in the correct display of multibyte characters. Usually, multibyte characters larger than 0xff are represented using the format \UXXXX for 16 bits and \WXXXXXXXX for 32 bits, and any UTF8Strings are converted to their character form first.
-noout
- Do not output the encoded version of the request.
-ocsp_uri
- Print the OCSP responder addresses, if any.
-ocspid
- Print OCSP hash values for the subject name and public key.
-pubkey
- Print the public key.
-serial
- Print the certificate serial number.
-startdate
- Print the start date of the certificate; that is, the
notBefore
date. -subject
- Print the subject name.
-subject_hash
- Print the hash of the certificate subject name. This is used in
openssl
to form an index to allow certificates in a directory to be looked up by subject name. -subject_hash_old
- Print the hash of the certificate subject name using the older algorithm
as used by
openssl
versions before 1.0.0. -text
- Print the full certificate in text form.
A trusted certificate is a certificate which has several additional pieces of information attached to it such as the permitted and prohibited uses of the certificate and an alias. When a certificate is being verified at least one certificate must be trusted. By default, a trusted certificate must be stored locally and be a root CA. The following are x509 trust settings options:
-addreject
arg- Add a prohibited use. Accepts the same values as the
-addtrust
option. -addtrust
arg- Add a trusted certificate use. Any object name can be used here, but
currently only
clientAuth
(SSL client use),serverAuth
(SSL server use), andemailProtection
(S/MIME email) are used. -alias
- Output the certificate alias.
-clrreject
- Clear all the prohibited or rejected uses of the certificate.
-clrtrust
- Clear all the permitted or trusted uses of the certificate.
-purpose
- Perform tests on the certificate extensions. The same code is used when
verifying untrusted certificates in chains, so this section is useful if a
chain is rejected by the verify code.
The
basicConstraints
extension CA flag is used to determine whether the certificate can be used as a CA. If the CA flag is true, it is a CA; if the CA flag is false, it is not a CA. All CAs should have the CA flag set to true.If the
basicConstraints
extension is absent, then the certificate is considered to be a possible CA; other extensions are checked according to the intended use of the certificate. A warning is given in this case because the certificate should really not be regarded as a CA. However it is allowed to be a CA to work around some broken software.If the certificate is a V1 certificate (and thus has no extensions) and it is self-signed, it is also assumed to be a CA but a warning is again given. This is to work around the problem of Verisign roots which are V1 self-signed certificates.
If the
keyUsage
extension is present, then additional restraints are made on the uses of the certificate. A CA certificate must have thekeyCertSign
bit set if thekeyUsage
extension is present.The extended key usage extension places additional restrictions on the certificate uses. If this extension is present, whether critical or not, the key can only be used for the purposes specified.
A complete description of each test is given below. The comments about
basicConstraints
andkeyUsage
and V1 certificates above apply to all CA certificates.- SSL Client
- The extended key usage extension must be absent or include the web
client authentication OID.
keyUsage
must be absent or it must have thedigitalSignature
bit set. The Netscape certificate type must be absent or it must have the SSL client bit set. - SSL Client CA
- The extended key usage extension must be absent or include the web
client authentication OID. The Netscape certificate type must be
absent or it must have the SSL CA bit set: this is used as a
workaround if the
basicConstraints
extension is absent. - SSL Server
- The extended key usage extension must be absent or include the web
server authentication and/or one of the SGC OIDs.
keyUsage
must be absent or it must have thedigitalSignature
set, thekeyEncipherment
set, or both bits set. The Netscape certificate type must be absent or have the SSL server bit set. - SSL Server CA
- The extended key usage extension must be absent or include the web
server authentication and/or one of the SGC OIDs. The Netscape
certificate type must be absent or the SSL CA bit must be set: this is
used as a workaround if the
basicConstraints
extension is absent. - Netscape SSL Server
- For Netscape SSL clients to connect to an SSL server; it must have the
keyEncipherment
bit set if thekeyUsage
extension is present. This isn't always valid because some cipher suites use the key for digital signing. Otherwise it is the same as a normal SSL server. - Common S/MIME Client Tests
- The extended key usage extension must be absent or include the email protection OID. The Netscape certificate type must be absent or should have the S/MIME bit set. If the S/MIME bit is not set in Netscape certificate type, then the SSL client bit is tolerated as an alternative but a warning is shown: this is because some Verisign certificates don't set the S/MIME bit.
- S/MIME Signing
- In addition to the common S/MIME client tests, the
digitalSignature
bit must be set if thekeyUsage
extension is present. - S/MIME Encryption
- In addition to the common S/MIME tests, the
keyEncipherment
bit must be set if thekeyUsage
extension is present. - S/MIME CA
- The extended key usage extension must be absent or include the email
protection OID. The Netscape certificate type must be absent or must
have the S/MIME CA bit set: this is used as a workaround if the
basicConstraints
extension is absent. - CRL Signing
- The
keyUsage
extension must be absent or it must have the CRL signing bit set. - CRL Signing CA
- The normal CA tests apply, except the
basicConstraints
extension must be present.
-setalias
arg- Set the alias of the certificate, allowing the certificate to be referred to using a nickname, such as "Steve's Certificate".
-trustout
- Output a trusted certificate (the default if any trust settings are modified). An ordinary or trusted certificate can be input, but by default an ordinary certificate is output and any trust settings are discarded.
The x509
utility can be used to sign
certificates and requests: it can thus behave like a mini CA. The following
are x509 signing options:
-CA
file- The CA certificate to be used for signing. When this option is present,
x509
behaves like a mini CA. The input file is signed by the CA using this option; that is, its issuer name is set to the subject name of the CA and it is digitally signed using the CA's private key.This option is normally combined with the
-req
option. Without the-req
option, the input is a certificate which must be self-signed. -CAcreateserial
- Create the CA serial number file if it does not exist instead of generating an error. The file will contain the serial number ‘02’ and the certificate being signed will have ‘1’ as its serial number.
-CAform
der
|pem
- The format of the CA certificate file. The default is
pem
. -CAkey
file- Set the CA private key to sign a certificate with. Otherwise it is assumed that the CA private key is present in the CA certificate file.
-CAkeyform
der
|pem
- The format of the CA private key. The default is
pem
. -CAserial
file- Use the serial number in file to sign a certificate.
The file should consist of one line containing an even number of hex
digits with the serial number to use. After each use the serial number is
incremented and written out to the file again.
The default filename consists of the CA certificate file base name with .srl appended. For example, if the CA certificate file is called mycacert.pem, it expects to find a serial number file called mycacert.srl.
-checkend
arg- Check whether the certificate expires in the next arg seconds. If so, exit with return value 1; otherwise exit with return value 0.
-clrext
- Delete any extensions from a certificate. This option is used when a
certificate is being created from another certificate (for example with
the
-signkey
or the-CA
options). Normally, all extensions are retained. -days
arg- The number of days to make a certificate valid for. The default is 30 days.
-extensions
section- The section to add certificate extensions from. If this option is not specified, the extensions should either be contained in the unnamed (default) section or the default section should contain a variable called "extensions" which contains the section to use.
-extfile
file- File containing certificate extensions to use. If not specified, no extensions are added to the certificate.
-keyform
der
|pem
- The format of the private key file used in the
-signkey
option. -req
- Expect a certificate request on input instead of a certificate.
-set_serial
n- The serial number to use. This option can be used with either the
-signkey
or-CA
options. If used in conjunction with the-CA
option, the serial number file (as specified by the-CAserial
or-CAcreateserial
options) is not used.The serial number can be decimal or hex (if preceded by ‘0x’). Negative serial numbers can also be specified but their use is not recommended.
-signkey
file- Self-sign file using the supplied private key.
If the input file is a certificate, it sets the issuer name to the subject name (i.e. makes it self-signed), changes the public key to the supplied value, and changes the start and end dates. The start date is set to the current time and the end date is set to a value determined by the
-days
option. Any certificate extensions are retained unless the-clrext
option is supplied.If the input is a certificate request, a self-signed certificate is created using the supplied private key using the subject name in the request.
-x509toreq
- Convert a certificate into a certificate request. The
-signkey
option is used to pass the required private key.
COMMON NOTATION
Several commands share a common syntax, as detailed below.
Password arguments, typically specified using
-passin
and -passout
for
input and output passwords, allow passwords to be obtained from a variety of
sources. Both of these options take a single argument, described below. If
no password argument is given and a password is required, then the user is
prompted to enter one: this will typically be read from the current terminal
with echoing turned off.
pass
:password- The actual password is password. Since the password is visible to utilities, this form should only be used where security is not important.
env
:var- Obtain the password from the environment variable var. Since the environment of other processes is visible, this option should be used with caution.
file
:path- The first line of path is the password. If the same
path argument is supplied to
-passin
and-passout
, then the first line will be used for the input password and the next line for the output password. path need not refer to a regular file: it could, for example, refer to a device or named pipe. fd
:number- Read the password from the file descriptor number. This can be used to send the data via a pipe, for example.
stdin
- Read the password from standard input.
Input/output formats, typically specified using
-inform
and -outform
,
indicate the format being read from or written to. The argument is case
insensitive.
ENVIRONMENT
The following environment variables affect the execution of
openssl
:
OPENSSL_CONF
- The location of the master configuration file.
FILES
- /etc/ssl/
- Default config directory for
openssl
. - /etc/ssl/lib/
- Unused.
- /etc/ssl/private/
- Default private key directory.
- /etc/ssl/openssl.cnf
- Default configuration file for
openssl
. - /etc/ssl/x509v3.cnf
- Default configuration file for
x509
certificates.
SEE ALSO
STANDARDS
T. Dierks and C. Allen, The TLS Protocol Version 1.0, RFC 2246, January 1999.
M. Wahl, S. Killie, and T. Howes, Lightweight Directory Access Protocol (v3): UTF-8 String Representation of Distinguished Names, RFC 2253, December 1997.
B. Kaliski, PKCS #7: Cryptographic Message Syntax Version 1.5, RFC 2315, March 1998.
R. Housley, W. Ford, W. Polk, and D. Solo, Internet X.509 Public Key Infrastructure Certificate and CRL Profile, RFC 2459, January 1999.
M. Myers, R. Ankney, A. Malpani, S. Galperin, and C. Adams, X.509 Internet Public Key Infrastructure Online Certificate Status Protocol – OCSP, RFC 2560, June 1999.
R. Housley, Cryptographic Message Syntax, RFC 2630, June 1999.
P. Chown, Advanced Encryption Standard (AES) Ciphersuites for Transport Layer Security (TLS), RFC 3268, June 2002.