DOKK / manpages / debian 12 / node-sshpk / sshpk-verify.1.en
SSHPK-VERIFY() SSHPK-VERIFY()

sshpk-verify - verify a signature on data using an SSH key

sshpk-verify -i KEYPATH -s SIGNATURE [OPTION...]

Takes in arbitrary bytes and a Base64-encoded signature, and verifies that the signature was produced by the private half of the given SSH public key.

$ printf 'foo' | sshpk-verify -i ~/.ssh/id_ecdsa -s MEUCIQCYp...
OK
$ printf 'foo' | sshpk-verify -i ~/.ssh/id_ecdsa -s GARBAGE...
NOT OK

0
Signature validates and matches the key.

1
Signature is parseable and the correct length but does not match the key or
otherwise is invalid.

2
The signature or key could not be parsed.

3
Invalid commandline options were supplied.

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

-i KEY, --identity=KEY
Select the key to be used for verification. 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.

-s BASE64, --signature=BASE64
Supplies the base64-encoded signature to be verified.

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

-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.

sshpk-sign(1)

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

May 2022