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Use a rich object to represent a message digest.
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// 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. | ||
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library crypto.digest; | ||
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import 'dart:typed_data'; | ||
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import 'crypto_utils.dart'; | ||
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/// 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; | ||
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Digest(List<int> bytes) | ||
: bytes = new Uint8List.fromList(bytes); | ||
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/// 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; | ||
if (other.bytes.length != bytes.length) return false; | ||
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var result = 0; | ||
for (var i = 0; i < bytes.length; i++) { | ||
result |= bytes[i] ^ other.bytes[i]; | ||
} | ||
return result == 0; | ||
} | ||
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/// The message digest as a string of hexadecimal digits. | ||
String toString() => CryptoUtils.bytesToHex(bytes); | ||
} |