cryptographically sign and verify
signify utility creates and verifies
cryptographic signatures. A signature verifies the integrity of a
message. The mode of operation is selected with the
- Verify a signed checksum list, and then verify the checksum for each file. If no files are specified, all of them are checked. sigfile should be the signed output of sha256(1).
- Generate a new key pair. Keynames should follow the convention of keyname.pub and keyname.sec for the public and secret keys, respectively.
- Sign the specified message file and create a signature.
- Verify the message and signature match.
The other options are as follows:
- Specify the comment to be added during key generation.
- When signing, embed the message after the signature. When verifying,
extract the message from the signature. (This requires that the signature
was created using
-eand creates a new message file as output.)
- When signing, the file containing the message to sign. When verifying, the
file containing the message to verify. When verifying with
-e, the file to create.
- When generating a key pair, do not ask for a passphrase. Otherwise,
signifywill prompt the user for a passphrase to protect the secret key. When signing with
-z, store a zero time stamp in the gzip(1) header.
- Public key produced by
-G, and used by
-Vto check a signature.
- Quiet mode. Suppress informational output.
- Secret (private) key produced by
-G, and used by
-Sto sign a message.
- When deducing the correct key to check a signature, make sure the actual key matches /etc/signify/*-keytype.pub.
- The signature file to create or verify. The default is message.sig.
- Sign and verify gzip(1) archives, where the signing data is embedded in the gzip(1) header.
The key and signature files created by
signify have the same format. The first line of the
file is a free form text comment that may be edited, so long as it does not
exceed a single line. Signature comments will be generated based on the name
of the secret key used for signing. This comment can then be used as a hint
for the name of the public key when verifying. The second line of the file
is the actual key or signature base64 encoded.
signify utility exits 0 on
success, and >0 if an error occurs. It may fail because of one of
the following reasons:
- Some necessary files do not exist.
- Entered passphrase is incorrect.
- The message file was corrupted and its signature does not match.
- The message file is too large.
Create a new key pair:
$ signify -G -p newkey.pub -s newkey.sec
Sign a file, specifying a signature name:
$ signify -S -s key.sec -m message.txt -x msg.sig
Verify a signature, using the default signature name:
$ signify -V -p key.pub -m generalsorders.txt
Verify a release directory containing SHA256.sig and a full set of release files:
$ signify -C -p /etc/signify/openbsd-73-base.pub -x SHA256.sig
Verify a bsd.rd before an upgrade:
$ signify -C -p /etc/signify/openbsd-73-base.pub -x SHA256.sig bsd.rd
Sign a gzip archive:
$ signify -Sz -s key-arc.sec -m in.tgz -x out.tgz
Verify a gzip pipeline:
$ ftp url | signify -Vz -t arc | tar ztf -
gzip(1), pkg_add(1), sha256(1), fw_update(8), sysupgrade(8)
signify command first appeared in
Ted Unangst <firstname.lastname@example.org> and Marc Espie <email@example.com>.