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<h1 class="page-title">Source: crypto/signature.js</h1>
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<pre class="prettyprint source"><code>/**
* @requires crypto/hash
* @requires crypto/pkcs1
* @requires crypto/public_key
* @module crypto/signature */
var publicKey = require('./public_key'),
pkcs1 = require('./pkcs1.js'),
hashModule = require('./hash');
module.exports = {
/**
*
* @param {module:enums.publicKey} algo public Key algorithm
* @param {module:enums.hash} hash_algo Hash algorithm
* @param {Array<module:type/mpi>} msg_MPIs Signature multiprecision integers
* @param {Array<module:type/mpi>} publickey_MPIs Public key multiprecision integers
* @param {String} data Data on where the signature was computed on.
* @return {Boolean} true if signature (sig_data was equal to data over hash)
*/
verify: function(algo, hash_algo, msg_MPIs, publickey_MPIs, data) {
var calc_hash = hashModule.digest(hash_algo, data);
var dopublic;
switch (algo) {
case 1:
// RSA (Encrypt or Sign) [HAC]
case 2:
// RSA Encrypt-Only [HAC]
case 3:
// RSA Sign-Only [HAC]
var rsa = new publicKey.rsa();
var n = publickey_MPIs[0].toBigInteger();
var e = publickey_MPIs[1].toBigInteger();
var x = msg_MPIs[0].toBigInteger();
dopublic = rsa.verify(x, e, n);
var hash = pkcs1.emsa.decode(hash_algo, dopublic.toMPI().substring(2));
if (hash == -1) {
throw new Error('PKCS1 padding in message or key incorrect. Aborting...');
}
return hash == calc_hash;
case 16:
// Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
throw new Error("signing with Elgamal is not defined in the OpenPGP standard.");
case 17:
// DSA (Digital Signature Algorithm) [FIPS186] [HAC]
var dsa = new publicKey.dsa();
var s1 = msg_MPIs[0].toBigInteger();
var s2 = msg_MPIs[1].toBigInteger();
var p = publickey_MPIs[0].toBigInteger();
var q = publickey_MPIs[1].toBigInteger();
var g = publickey_MPIs[2].toBigInteger();
var y = publickey_MPIs[3].toBigInteger();
var m = data;
dopublic = dsa.verify(hash_algo, s1, s2, m, p, q, g, y);
return dopublic.compareTo(s1) === 0;
default:
throw new Error('Invalid signature algorithm.');
}
},
/**
* Create a signature on data using the specified algorithm
* @param {module:enums.hash} hash_algo hash Algorithm to use (See {@link http://tools.ietf.org/html/rfc4880#section-9.4|RFC 4880 9.4})
* @param {module:enums.publicKey} algo Asymmetric cipher algorithm to use (See {@link http://tools.ietf.org/html/rfc4880#section-9.1|RFC 4880 9.1})
* @param {Array<module:type/mpi>} publicMPIs Public key multiprecision integers
* of the private key
* @param {Array<module:type/mpi>} secretMPIs Private key multiprecision
* integers which is used to sign the data
* @param {String} data Data to be signed
* @return {Array<module:type/mpi>}
*/
sign: function(hash_algo, algo, keyIntegers, data) {
var m;
switch (algo) {
case 1:
// RSA (Encrypt or Sign) [HAC]
case 2:
// RSA Encrypt-Only [HAC]
case 3:
// RSA Sign-Only [HAC]
var rsa = new publicKey.rsa();
var d = keyIntegers[2].toBigInteger();
var n = keyIntegers[0].toBigInteger();
m = pkcs1.emsa.encode(hash_algo,
data, keyIntegers[0].byteLength());
return rsa.sign(m, d, n).toMPI();
case 17:
// DSA (Digital Signature Algorithm) [FIPS186] [HAC]
var dsa = new publicKey.dsa();
var p = keyIntegers[0].toBigInteger();
var q = keyIntegers[1].toBigInteger();
var g = keyIntegers[2].toBigInteger();
var y = keyIntegers[3].toBigInteger();
var x = keyIntegers[4].toBigInteger();
m = data;
var result = dsa.sign(hash_algo, m, g, p, q, x);
return result[0].toString() + result[1].toString();
case 16:
// Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
throw new Error('Signing with Elgamal is not defined in the OpenPGP standard.');
default:
throw new Error('Invalid signature algorithm.');
}
}
};
</code></pre>
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