gosignify is a Go reimplementation of OpenBSD's signify (manpage, blog post, CVS). It strives to be fully compatible with the original C implementation.
Additional features:
- gosignify can process Linux-style checksum files (created without option
-tag)
go get -v github.com/frankbraun/gosignify
SYNOPSIS
gosignify -C [-q] -p pubkey -x sigfile [file ...]
gosignify -G [-n] [-c comment] -p pubkey -s seckey
gosignify -I [-p pubkey] [-s seckey] [-x sigfile]
gosignify -S [-e] [-x sigfile] -s seckey -m message
gosignify -V [-eq] [-x sigfile] -p pubkey -m message
DESCRIPTION
The gosignify utility creates and verifies cryptographic signatures. A
signature verifies the integrity of a message. The mode of operation is
selected with the following options:
-C 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).
-G Generate a new key pair.
-I Inspect the specified keys or signature and print their fin-
gerprint.
-S Sign the specified message file and create a signature.
-V Verify the message and signature match.
The other options are as follows:
-c comment Specify the comment to be added during key generation.
-e When signing, embed the message after the signature. When
verifying, extract the message from the signature. (This
requires that the signature was created using -e and cre-
ates a new message file as output.)
-m message 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.
-n Do not ask for a passphrase during key generation. Other-
wise, gosignify will prompt the user for a passphrase to pro-
tect the secret key.
-p pubkey Public key produced by -G, and used by -V to check a signa-
ture.
-q Quiet mode. Suppress informational output.
-s seckey Secret (private) key produced by -G, and used by -S to sign
a message.
-x sigfile The signature file to create or verify. The default is
message.sig.
The key and signature files created by gosignify 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. The second line of the file is
the actual key or signature base64 encoded.
EXIT STATUS
The gosignify utility exits 0 on success, and >0 if an error occurs. It
may fail because of one of the following reasons:
o Some necessary files do not exist.
o Entered passphrase is incorrect.
o The message file was corrupted and its signature does not match.
o The message file is too large.
EXAMPLES
Create a new key pair:
$ gosignify -G -p newkey.pub -s newkey.sec
Sign a file, specifying a signature name:
$ gosignify -S -s key.sec -m message.txt -x msg.sig
Verify a signature, using the default signature name:
$ gosignify -V -p key.pub -m generalsorders.txt
Verify a release directory containing SHA256.sig and a full set of
release files:
$ gosignify -C -p /etc/signify/openbsd-55-base.pub -x SHA256.sig
Verify a bsd.rd before an upgrade:
$ gosignify -C -p /etc/signify/openbsd-55-base.pub -x SHA256.sig bsd.rd
SEE ALSO
fw_update(1), pkg_add(1), sha256(1)
HISTORY
The signify command first appeared in OpenBSD 5.5.