eccrypto/index.js
2015-01-02 18:21:24 +03:00

63 lines
1.6 KiB
JavaScript

/**
* Node.js eccrypto implementation.
* @module eccrypto
*/
"use strict";
require("es6-promise").polyfill();
var secp256k1 = require("secp256k1");
/**
* Compute the public key for a given private key.
* @param {Buffer} privateKey - A 32-byte private key
* @return {Buffer} A 65-byte public key.
* @function
*/
var getPublic = exports.getPublic = secp256k1.createPublicKey;
/**
* Create an ECDSA signature.
* @param {Buffer} privateKey - A 32-byte private key
* @param {Buffer} msg - The message being signed
* @return {Promise.<Buffer>} A promise that resolves with the
* signature and rejects on bad key or message.
*/
// FIXME(Kagami): What to do in case of invalid nonce?
exports.sign = function(privateKey, msg) {
return new Promise(function(resolve, reject) {
try {
secp256k1.sign(privateKey, msg, function(code, sig) {
if (code === 1) {
resolve(sig);
} else {
reject();
}
});
} catch(e) {
reject();
}
});
};
/**
* Verify an ECDSA signature.
* @param {Buffer} key - A private or public key
* @param {Buffer} msg - The message being verified
* @param {Buffer} sig - The signature
* @return {Promise.<undefined>} A promise that resolves on correct
* signature and rejects on bad key or signature.
*/
exports.verify = function(key, msg, sig) {
var publicKey = key.length === 32 ? getPublic(key) : key;
return new Promise(function(resolve, reject) {
secp256k1.verify(publicKey, msg, sig, function(code) {
if (code === 1) {
resolve();
} else {
reject();
}
});
});
};