NAME

       sshpk-sign - sign data using an SSH key

SYNOPSYS

       sshpk-sign -i KEYPATH [OPTION...]

DESCRIPTION

       Takes  in  arbitrary bytes, and signs them using an SSH private key. The key can be of any
       type or format supported by the sshpk library, including the standard OpenSSH formats,  as
       well as PEM PKCS#1 and PKCS#8.

       The  signature  is  printed  out  in  Base64 encoding, unless the --binary or -b option is
       given.

EXAMPLES

       Signing with default settings:

         $ printf 'foo' | sshpk-sign -i ~/.ssh/id_ecdsa
         MEUCIAMdLS/vXrrtWFepwe...

       Signing in SSH (RFC 4253) format (rather than the default ASN.1):

         $ printf 'foo' | sshpk-sign -i ~/.ssh/id_ecdsa -t ssh
         AAAAFGVjZHNhLXNoYTIt...

       Saving the binary signature to a file:

         $ printf 'foo' | sshpk-sign -i ~/.ssh/id_ecdsa \
                                     -o signature.bin -b
         $ cat signature.bin | base64
         MEUCIAMdLS/vXrrtWFepwe...

OPTIONS

       -v, --verbose
         Print extra information about the key and signature to stderr when signing.

       -b, --binary
         Don't base64-encode the signature before outputting it.

       -i KEY, --identity=KEY
         Select the key to be used for signing. KEY must be a relative or absolute
         filesystem path to the key file. Any format supported by the sshpk library
         is supported, including OpenSSH formats and standard PEM PKCS.

       -f PATH, --file=PATH
         Input file to sign instead of stdin.

       -o PATH, --out=PATH
         Output file to save signature in instead of stdout.

       -H HASH, --hash=HASH
         Set the hash algorithm to be used for signing. This should be one of sha1,
         sha256 or sha512. Some key types may place restrictions on which hash
         algorithms may be used (e.g. ED25519 keys can only use SHA-512).

       -t FORMAT, --format=FORMAT
         Choose the signature format to use, from asn1, ssh or raw (only for
         ED25519 signatures). The asn1 format is the default, as it is the format
         used with TLS and typically the standard in most non-SSH libraries (e.g.
         OpenSSL). The ssh format is used in the SSH protocol and by the ssh-agent.

SEE ALSO

       sshpk-verify(1)

BUGS

       Report bugs at Github https://github.com/arekinath/node-sshpk/issues

                                           January 2020                              SSHPK-SIGN()