| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'crypto_utils.dart'; |
| |
| /// A message digest as computed by a [Hash] or [HMAC] function. |
| class Digest { |
| /// The message digest as an array of bytes. |
| final List<int> bytes; |
| |
| Digest(this.bytes); |
| |
| /// Returns whether this is equal to another digest. |
| /// |
| /// This should be used instead of manual comparisons to avoid leaking |
| /// information via timing. |
| bool operator ==(Object other) { |
| if (other is! Digest) return false; |
| |
| var digest = other as Digest; |
| if (digest.bytes.length != bytes.length) return false; |
| |
| var result = 0; |
| for (var i = 0; i < bytes.length; i++) { |
| result |= bytes[i] ^ digest.bytes[i]; |
| } |
| return result == 0; |
| } |
| |
| /// The message digest as a string of hexadecimal digits. |
| String toString() => CryptoUtils.bytesToHex(bytes); |
| } |