ssh-sign.coffee

fs = require 'fs'
crypto = require 'crypto'
SSHAgentClient = require('ssh-agent')
sshKeyToPEM = require 'ssh-key-to-pem'
client = new SSHAgentClient()


data = new Buffer 'mrdkaaaaaaa'

client.requestIdentities (err, keys) ->
    key = null
    for key in keys
        if key.type is 'ssh-rsa'
            break

    if !key
        return

    client.sign key, data, (err, signature) ->
        console.log err if err

        cipertext = new Buffer(signature.signature, 'base64')

        pub = 'ssh-rsa AAAA=='

        key = sshKeyToPEM pub

        publicKey = new Buffer key

        verify = (publicKey, text, cipher) ->
            for h in ['rsa-sha1', 'rsa-sha1-2', 'sha1']
                try
                    verifier = crypto.createVerify(h.toUpperCase())
                    verifier.update text
                    result = verifier.verify publicKey, cipher, "binary"
                    return yes if result is yes
                catch err
            no

        console.log verify publicKey, data, cipertext