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ENABLE X3DH WITH ED25519 KEYS

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PapaTutuWawa
2022-08-01 23:20:31 +02:00
parent 0565cdef81
commit 34df73c929
5 changed files with 51 additions and 61 deletions
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32
lib/src/x3dh/x3dh.dart
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@@ -1,6 +1,8 @@
import 'dart:convert';
import 'dart:typed_data';
import 'package:cryptography/cryptography.dart';
import 'package:cryptography/dart.dart';
import 'package:pinenacl/api.dart';
import 'package:pinenacl/tweetnacl.dart';
/// The overarching assumption is that we use Ed25519 keys for the identity keys
@@ -31,15 +33,31 @@ Future<List<int>> dh(SimpleKeyPair kp, SimplePublicKey pk, int identityKey) asyn
var ckp = kp;
var cpk = pk;
/*
if (identityKey == 1) {
final pkc = await DartEd25519.publicKeyToCurve25519(kp);
final skc = await DartEd25519.privateKeyToCurve25519(kp);
ckp = SimpleKeyPairData(skc, publicKey: pkc, type: KeyPairType.x25519);
final pubkeyBytes = (await kp.extractPublicKey()).bytes;
final pkc = Uint8List(32);
TweetNaClExt.crypto_sign_ed25519_pk_to_x25519_pk(pkc, Uint8List.fromList(pubkeyBytes));
final keyPairData = await kp.extract();
final privateKeyBytes = await keyPairData.extractPrivateKeyBytes();
final skc = Uint8List(32);
TweetNaClExt.crypto_sign_ed25519_sk_to_x25519_sk(skc, Uint8List.fromList(privateKeyBytes));
ckp = SimpleKeyPairData(
List<int>.from(skc),
publicKey: SimplePublicKey(List<int>.from(pkc), type: KeyPairType.x25519),
type: KeyPairType.x25519,
);
} else if (identityKey == 2) {
cpk = await DartEd25519.publicKeyToCurve25519(fromPublicKey(pk));
final pubkeyBytes = pk.bytes;
final pkc = Uint8List(32);
TweetNaClExt.crypto_sign_ed25519_pk_to_x25519_pk(pkc, Uint8List.fromList(pubkeyBytes));
cpk = SimplePublicKey(
List<int>.from(pkc),
type: KeyPairType.x25519,
);
}
*/
final shared = await Cryptography.instance.x25519().sharedSecretKey(
keyPair: ckp,