NAME
X509_sign,
X509_sign_ctx, X509_verify,
X509_REQ_sign,
X509_REQ_sign_ctx,
X509_REQ_verify,
X509_CRL_sign,
X509_CRL_sign_ctx,
X509_CRL_verify —
sign or verify certificate, certificate
request, or CRL signature
SYNOPSIS
#include
<openssl/x509.h>
int
X509_sign(X509 *x,
EVP_PKEY *pkey, const EVP_MD
*md);
int
X509_sign_ctx(X509 *x,
EVP_MD_CTX *ctx);
int
X509_verify(X509 *a,
EVP_PKEY *r);
int
X509_REQ_sign(X509_REQ *x,
EVP_PKEY *pkey, const EVP_MD
*md);
int
X509_REQ_sign_ctx(X509_REQ *x,
EVP_MD_CTX *ctx);
int
X509_REQ_verify(X509_REQ *a,
EVP_PKEY *r);
int
X509_CRL_sign(X509_CRL *x,
EVP_PKEY *pkey, const EVP_MD
*md);
int
X509_CRL_sign_ctx(X509_CRL *x,
EVP_MD_CTX *ctx);
int
X509_CRL_verify(X509_CRL *a,
EVP_PKEY *r);
DESCRIPTION
X509_sign()
signs the certificate x using the private key
pkey and the message digest md
and sets the signature in x.
X509_sign_ctx() also signs the certificate
x but uses the parameters contained in digest context
ctx.
X509_verify()
verifies the signature of certificate x using the
public key pkey. Only the signature is checked: no
other checks (such as certificate chain validity) are performed.
X509_REQ_sign(),
X509_REQ_sign_ctx(),
X509_REQ_verify(),
X509_CRL_sign(),
X509_CRL_sign_ctx(),
and
X509_CRL_verify()
sign and verify certificate requests and CRLs, respectively.
X509_sign_ctx()
is used where the default parameters for the corresponding public key and
digest are not suitable. It can be used to sign keys using RSA-PSS for
example.
For efficiency reasons and to work around ASN.1 encoding issues, the encoding of the signed portion of a certificate, certificate request, and CRL is cached internally. If the signed portion of the structure is modified, the encoding is not always updated, meaning a stale version is sometimes used. This is not normally a problem because modifying the signed portion will invalidate the signature and signing will always update the encoding.
RETURN VALUES
X509_sign(),
X509_sign_ctx(),
X509_REQ_sign(),
X509_REQ_sign_ctx(),
X509_CRL_sign(), and
X509_CRL_sign_ctx() return the size of the signature
in bytes for success or 0 for failure.
X509_verify(),
X509_REQ_verify(), and
X509_CRL_verify() return 1 if the signature is valid
or 0 if the signature check fails. If the signature could not be checked at
all because it was invalid or some other error occurred, then -1 is
returned.
In some cases of failure, the reason can be determined with ERR_get_error(3).
SEE ALSO
d2i_X509(3), EVP_DigestInit(3), X509_CRL_get0_by_serial(3), X509_CRL_new(3), X509_get_pubkey(3), X509_get_subject_name(3), X509_get_version(3), X509_NAME_add_entry_by_txt(3), X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3), X509_REQ_new(3), X509_verify_cert(3), X509V3_get_d2i(3)
HISTORY
X509_verify() appeared in SSLeay 0.4 or
earlier. X509_sign() and
X509_REQ_sign() first appeared in SSLeay 0.4.4.
X509_REQ_verify() and
X509_CRL_verify() first appeared in SSLeay 0.4.5b.
X509_CRL_sign() first appeared in SSLeay 0.5.1.
These functions have been available since OpenBSD
2.4.
X509_sign_ctx(),
X509_REQ_sign_ctx(), and
X509_CRL_sign_ctx() first appeared in OpenSSL 1.0.1
and have been available since OpenBSD 5.3.