NAME

     signify-openbsd — cryptographically sign and verify files

SYNOPSIS

     signify-openbsd -C [-q] [-p pubkey] [-t keytype] -x sigfile [file ...]
     signify-openbsd -G [-n] [-c comment] -p pubkey -s seckey
     signify-openbsd -S [-enz] [-x sigfile] -s seckey -m message
     signify-openbsd -V [-eqz] [-p pubkey] [-t keytype] [-x sigfile] -m message

DESCRIPTION

     The signify-openbsd 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.  Keynames should follow the convention of keyname.pub
                 and keyname.sec for the public and secret keys, respectively.

     -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 creates 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            When generating a key pair, do not ask for a passphrase.  Otherwise,
                   signify-openbsd will 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.

     -p pubkey     Public key produced by -G, and used by -V to check a signature.

     -q            Quiet mode.  Suppress informational output.

     -s seckey     Secret (private) key produced by -G, and used by -S to sign a message.

     -t keytype    When deducing the correct key to check a signature, make sure the actual key
                   matches /etc/signify/*-keytype.pub.

     -x sigfile    The signature file to create or verify.  The default is message.sig.

     -z            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-openbsd 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.

EXIT STATUS

     The signify-openbsd 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.

EXAMPLES

     Create a new key pair:
           $ signify-openbsd -G -p newkey.pub -s newkey.sec

     Sign a file, specifying a signature name:
           $ signify-openbsd -S -s key.sec -m message.txt -x msg.sig

     Verify a signature, using the default signature name:
           $ signify-openbsd -V -p key.pub -m generalsorders.txt

     Verify a release directory containing SHA256.sig and a full set of release files:
           $ signify-openbsd -C -p /etc/signify/openbsd-67-base.pub -x SHA256.sig

     Verify a bsd.rd before an upgrade:
           $ signify-openbsd -C -p /etc/signify/openbsd-67-base.pub -x SHA256.sig bsd.rd

     Sign a gzip archive:
           $ signify-openbsd -Sz -s key-arc.sec -m in.tgz -x out.tgz

     Verify a gzip pipeline:
           $ ftp url | signify-openbsd -Vz -t arc | tar ztf -

SEE ALSO

     fw_update(1), gzip(1), pkg_add(1), sha256(1), sysupgrade(8)

HISTORY

     The signify-openbsd command first appeared in OpenBSD 5.5.

AUTHORS

     Ted Unangst <tedu@openbsd.org> and Marc Espie <espie@openbsd.org>.