48 lines
1.4 KiB
Dart
48 lines
1.4 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:crypto/crypto.dart';
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class ChatCacheFingerprint {
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static final Uint8List _signatureDigest = _hex(
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'1684414033eb263e2c615f8b7df5ed8793850a07656304997fbf07e9e21e1e93',
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);
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static final Uint8List _soDigest = _hex(
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'c77b89270f44bd26c218a946c18911f2b156312693ea00b419d169b71c1ed111',
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);
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static final Uint8List _dexDigest = _hex(
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'490a2746c7ebbff050353c575a186ca65bc708f9b6e0c1329b59a3bfab6c3924',
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);
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static Uint8List compute(int callsSeed, String deviceId) {
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final seed = _int64BigEndian(callsSeed);
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final device = Uint8List.fromList(utf8.encode(deviceId));
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final result = BytesBuilder();
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result.add(_sha256(_signatureDigest, seed, device));
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result.add(_sha256(_soDigest, seed, device));
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result.add(_sha256(_dexDigest, seed, device));
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return result.toBytes();
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}
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static List<int> _sha256(Uint8List a, Uint8List b, Uint8List c) {
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final builder = BytesBuilder()
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..add(a)
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..add(b)
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..add(c);
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return sha256.convert(builder.toBytes()).bytes;
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}
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static Uint8List _int64BigEndian(int value) {
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final data = ByteData(8)..setInt64(0, value, Endian.big);
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return data.buffer.asUint8List();
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}
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static Uint8List _hex(String hex) {
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final out = Uint8List(hex.length ~/ 2);
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for (var i = 0; i < out.length; i++) {
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out[i] = int.parse(hex.substring(i * 2, i * 2 + 2), radix: 16);
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}
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return out;
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}
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}
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