71 lines
2.3 KiB
Dart
71 lines
2.3 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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// #***! отпечаток родной сборки, хэши подписи dex и so
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class ChatCacheFingerprint {
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static const String defaultArch = 'arm64-v8a';
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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 _dexDigest = _hex(
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'9affa687874d88ea80b298949f826bcf8c1bba36f24d48c44b8f54cdbf01c96f',
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);
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// #***! so своя на каждую архитектуру, берём ту что уехала в хэндшейк
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static final Map<String, Uint8List> _soDigests = {
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'arm64-v8a': _hex(
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'38e2e5de3d4a9010ea1053eb28573593683c5b2bb16b09914a8822476c8aab8c',
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),
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'armeabi-v7a': _hex(
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'f60cb2576885e0af5350c98fe88355a2f26008a372c998c193b6222f717e274f',
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),
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'x86': _hex(
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'80bd04964e7d0492740113047ff20ebdf88ba6e6eb48d8765cbd5fe678283065',
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),
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'x86_64': _hex(
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'96173e7c2d9449c1ab4474265b410f37ce45f560b0974460a75c7c6000ca22fd',
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),
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};
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// #***! три sha256 подряд, 96 байт серверу
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static Uint8List compute(
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int callsSeed,
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String deviceId, {
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String arch = defaultArch,
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}) {
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final seed = _int64BigEndian(callsSeed);
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final device = Uint8List.fromList(utf8.encode(deviceId));
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final soDigest = _soDigests[arch] ?? _soDigests[defaultArch]!;
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final result = BytesBuilder();
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result.add(_sha256(_signatureDigest, seed, device));
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result.add(_sha256(_dexDigest, seed, device));
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result.add(_sha256(soDigest, 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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// #***! seed звонков 8 байт big-endian
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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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// #***! хэши строкой, разворачиваем в байты
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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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