40 lines
1.4 KiB
Dart
40 lines
1.4 KiB
Dart
// Copyright (C) 2022 WYATT GROUP
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// Please see the AUTHORS file for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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import 'dart:convert';
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import 'dart:math';
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import 'package:crypto/crypto.dart';
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class Cryptography {
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/// Generates a cryptographically secure random nonce, to be included in a
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/// credential request.
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static String generateNonce([int length = 32]) {
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const charset =
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'0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._';
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final random = Random.secure();
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return List.generate(length, (_) => charset[random.nextInt(charset.length)])
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.join();
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}
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/// Returns the sha256 hash of [input] in hex notation.
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static String sha256ofString(String input) {
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final bytes = utf8.encode(input);
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final digest = sha256.convert(bytes);
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return digest.toString();
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}
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}
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