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88 lines
3.0 KiB
88 lines
3.0 KiB
// Copyright 2015 Joyent, Inc.
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var assert = require('assert-plus');
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var crypto = require('crypto');
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var sshpk = require('sshpk');
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var utils = require('./utils');
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var HASH_ALGOS = utils.HASH_ALGOS;
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var PK_ALGOS = utils.PK_ALGOS;
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var InvalidAlgorithmError = utils.InvalidAlgorithmError;
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var HttpSignatureError = utils.HttpSignatureError;
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var validateAlgorithm = utils.validateAlgorithm;
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///--- Exported API
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module.exports = {
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/**
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* Verify RSA/DSA signature against public key. You are expected to pass in
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* an object that was returned from `parse()`.
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*
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* @param {Object} parsedSignature the object you got from `parse`.
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* @param {String} pubkey RSA/DSA private key PEM.
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* @return {Boolean} true if valid, false otherwise.
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* @throws {TypeError} if you pass in bad arguments.
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* @throws {InvalidAlgorithmError}
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*/
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verifySignature: function verifySignature(parsedSignature, pubkey) {
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assert.object(parsedSignature, 'parsedSignature');
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if (typeof (pubkey) === 'string' || Buffer.isBuffer(pubkey))
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pubkey = sshpk.parseKey(pubkey);
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assert.ok(sshpk.Key.isKey(pubkey, [1, 1]), 'pubkey must be a sshpk.Key');
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var alg = validateAlgorithm(parsedSignature.algorithm);
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if (alg[0] === 'hmac' || alg[0] !== pubkey.type)
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return (false);
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var v = pubkey.createVerify(alg[1]);
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v.update(parsedSignature.signingString);
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return (v.verify(parsedSignature.params.signature, 'base64'));
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},
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/**
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* Verify HMAC against shared secret. You are expected to pass in an object
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* that was returned from `parse()`.
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*
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* @param {Object} parsedSignature the object you got from `parse`.
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* @param {String} secret HMAC shared secret.
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* @return {Boolean} true if valid, false otherwise.
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* @throws {TypeError} if you pass in bad arguments.
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* @throws {InvalidAlgorithmError}
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*/
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verifyHMAC: function verifyHMAC(parsedSignature, secret) {
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assert.object(parsedSignature, 'parsedHMAC');
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assert.string(secret, 'secret');
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var alg = validateAlgorithm(parsedSignature.algorithm);
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if (alg[0] !== 'hmac')
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return (false);
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var hashAlg = alg[1].toUpperCase();
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var hmac = crypto.createHmac(hashAlg, secret);
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hmac.update(parsedSignature.signingString);
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/*
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* Now double-hash to avoid leaking timing information - there's
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* no easy constant-time compare in JS, so we use this approach
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* instead. See for more info:
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* https://www.isecpartners.com/blog/2011/february/double-hmac-
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* verification.aspx
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*/
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var h1 = crypto.createHmac(hashAlg, secret);
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h1.update(hmac.digest());
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h1 = h1.digest();
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var h2 = crypto.createHmac(hashAlg, secret);
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h2.update(new Buffer(parsedSignature.params.signature, 'base64'));
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h2 = h2.digest();
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/* Node 0.8 returns strings from .digest(). */
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if (typeof (h1) === 'string')
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return (h1 === h2);
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/* And node 0.10 lacks the .equals() method on Buffers. */
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if (Buffer.isBuffer(h1) && !h1.equals)
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return (h1.toString('binary') === h2.toString('binary'));
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return (h1.equals(h2));
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}
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};
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