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139 lines
3.5 KiB
139 lines
3.5 KiB
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:pointycastle/export.dart';
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import '/utils/encryption/aes_helper.dart';
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import '/utils/encryption/crypto_utils.dart';
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// TODO: Find good place for this to live
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Friend findFriendByFriendId(List<Friend> friends, String id) {
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for (var friend in friends) {
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if (friend.friendId == id) {
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return friend;
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}
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}
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// Or return `null`.
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throw ArgumentError.value(id, 'id', 'No element with that id');
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}
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class Friend {
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String id;
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String userId;
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String username;
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String friendId;
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String friendSymmetricKey;
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RSAPublicKey publicKey;
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DateTime? acceptedAt;
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bool? selected;
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Friend({
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required this.id,
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required this.userId,
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required this.username,
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required this.friendId,
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required this.friendSymmetricKey,
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required this.publicKey,
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required this.acceptedAt,
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this.selected,
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});
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factory Friend.fromJson(Map<String, dynamic> json, RSAPrivateKey privKey) {
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Uint8List idDecrypted = CryptoUtils.rsaDecrypt(
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base64.decode(json['friend_id']),
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privKey,
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);
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Uint8List username = CryptoUtils.rsaDecrypt(
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base64.decode(json['friend_username']),
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privKey,
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);
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Uint8List symmetricKeyDecrypted = CryptoUtils.rsaDecrypt(
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base64.decode(json['symmetric_key']),
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privKey,
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);
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String publicKeyString = AesHelper.aesDecrypt(
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symmetricKeyDecrypted,
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base64.decode(json['asymmetric_public_key'])
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);
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RSAPublicKey publicKey = CryptoUtils.rsaPublicKeyFromPem(publicKeyString);
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return Friend(
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id: json['id'],
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userId: json['user_id'],
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username: String.fromCharCodes(username),
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friendId: String.fromCharCodes(idDecrypted),
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friendSymmetricKey: base64.encode(symmetricKeyDecrypted),
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publicKey: publicKey,
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acceptedAt: json['accepted_at']['Valid'] ?
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DateTime.parse(json['accepted_at']['Time']) :
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null,
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);
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}
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Map<String, dynamic> payloadJson() {
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Uint8List friendIdEncrypted = CryptoUtils.rsaEncrypt(
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Uint8List.fromList(friendId.codeUnits),
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publicKey,
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);
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Uint8List usernameEncrypted = CryptoUtils.rsaEncrypt(
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Uint8List.fromList(username.codeUnits),
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publicKey,
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);
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Uint8List symmetricKeyEncrypted = CryptoUtils.rsaEncrypt(
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Uint8List.fromList(
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base64.decode(friendSymmetricKey),
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),
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publicKey,
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);
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var publicKeyEncrypted = AesHelper.aesEncrypt(
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base64.decode(friendSymmetricKey),
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Uint8List.fromList(CryptoUtils.encodeRSAPublicKeyToPem(publicKey).codeUnits),
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);
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return {
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'id': id,
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'user_id': userId,
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'friend_id': base64.encode(friendIdEncrypted),
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'friend_username': base64.encode(usernameEncrypted),
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'symmetric_key': base64.encode(symmetricKeyEncrypted),
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'asymmetric_public_key': publicKeyEncrypted,
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'accepted_at': null,
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};
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}
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String publicKeyPem() {
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return CryptoUtils.encodeRSAPublicKeyToPem(publicKey);
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}
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Map<String, dynamic> toMap() {
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return {
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'id': id,
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'user_id': userId,
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'username': username,
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'friend_id': friendId,
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'symmetric_key': base64.encode(friendSymmetricKey.codeUnits),
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'asymmetric_public_key': publicKeyPem(),
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'accepted_at': acceptedAt?.toIso8601String(),
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};
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}
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@override
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String toString() {
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return '''
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id: $id
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userId: $userId
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username: $username
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friendId: $friendId
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accepted_at: $acceptedAt''';
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}
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}
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