30 lines
1.0 KiB
Dart
30 lines
1.0 KiB
Dart
import 'dart:convert';
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import 'package:friendly_map/modules/core/core.dart';
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/// 시험용 암호: 진짜 암호는 아니고, "두 사람의 키 + 단위 ID 가 맞아야 풀린다"는 약속만 흉내 낸다.
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class FakeCipher implements PayloadCipher {
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FakeCipher(this.myKey);
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final String myKey;
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String _tag(String peer, String context) => '${([myKey, peer]..sort()).join('+')}|$context';
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@override
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Future<String> seal({required String plain, required String peerPublicKey, required String context}) async =>
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'${_tag(peerPublicKey, context)}|${base64Encode(utf8.encode(plain))}';
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@override
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Future<String?> open({required String sealed, required String peerPublicKey, required String context}) async {
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final tag = _tag(peerPublicKey, context);
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if (!sealed.startsWith('$tag|')) return null;
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return utf8.decode(base64Decode(sealed.substring(tag.length + 1)));
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}
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}
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class FakeIdentity implements IdentityProvider {
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FakeIdentity(this.key);
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final String key;
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@override
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Future<String> myPublicKey() async => key;
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}
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