1d339653d5
- Add VariableSpec class with magnitude field validation - Add Formula class supporting multiple input/output variables - Support d4rt_code as string or object with code field - Add comprehensive tests for parsing and serialization - Fix broken test import in pruebas_d4rt_test.dart Follows README.md format requirements exactly
53 lines
1.5 KiB
Dart
53 lines
1.5 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:typed_data';
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/// A message digest as computed by a `Hash` or `HMAC` function.
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class Digest {
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/// The message digest as an array of bytes.
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final List<int> bytes;
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Digest(this.bytes);
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/// Returns whether this is equal to another digest.
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///
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/// This should be used instead of manual comparisons to avoid leaking
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/// information via timing.
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@override
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bool operator ==(Object other) {
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if (other is Digest) {
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final a = bytes;
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final b = other.bytes;
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final n = a.length;
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if (n != b.length) {
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return false;
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}
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var mismatch = 0;
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for (var i = 0; i < n; i++) {
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mismatch |= a[i] ^ b[i];
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}
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return mismatch == 0;
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}
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return false;
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}
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@override
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int get hashCode => Object.hashAll(bytes);
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/// The message digest as a string of hexadecimal digits.
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@override
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String toString() => _hexEncode(bytes);
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}
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String _hexEncode(List<int> bytes) {
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const hexDigits = '0123456789abcdef';
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var charCodes = Uint8List(bytes.length * 2);
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for (var i = 0, j = 0; i < bytes.length; i++) {
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var byte = bytes[i];
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charCodes[j++] = hexDigits.codeUnitAt((byte >> 4) & 0xF);
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charCodes[j++] = hexDigits.codeUnitAt(byte & 0xF);
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}
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return String.fromCharCodes(charCodes);
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}
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