Fix.

node_modules/http-signature/lib/verify.js

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