ssh-sign.coffee

fs = require 'fs'
crypto = require 'crypto'

publicKey = fs.readFileSync './pub.pem'
plaintext = fs.readFileSync './plaintext'
cipertext = fs.readFileSync './ja.sig'

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, plaintext, cipertext




------


var SSHAgentClient = require('ssh-agent');

var client = new SSHAgentClient();
fs = require('fs');
var data = fs.readFileSync('plaintext');

// Try to sign data with an RSA key (will generate
// an RSA-SHA1 signature).
client.requestIdentities(function(err, keys) {
  var key = null;
  for (var i = 0; i < keys.length; i++) {
    if (keys[i].type === 'ssh-rsa') {
      key = keys[i];
      break;
    }
  }
  if (!key)
    return;

  client.sign(key, data, function(err, signature) {
		fs = require('fs');
		fs.writeFileSync ('ja.sig',  new Buffer(signature.signature, 'base64'));
  });
});