PapaTutuWawa/omemo_dart
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fix: Migrate more from protobuf

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This commit is contained in:
PapaTutuWawa 2022-08-05 13:02:44 +02:00
parent 9ed94c8f3a
commit ff7cc8e95a
1 changed files with 8 additions and 7 deletions
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15
lib/src/double_ratchet/crypto.dart
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@ -1,7 +1,8 @@
import 'package:omemo_dart/protobuf/schema.pb.dart';
import 'package:omemo_dart/src/crypto.dart';
import 'package:omemo_dart/src/errors.dart';
import 'package:omemo_dart/src/helpers.dart';
import 'package:omemo_dart/src/protobuf/omemo_authenticated_message.dart';
import 'package:omemo_dart/src/protobuf/omemo_message.dart';
/// Info string for ENCRYPT
const encryptHkdfInfoString = 'OMEMO Message Key Material';
@ -14,12 +15,12 @@ Future<List<int>> encrypt(List<int> mk, List<int> plaintext, List<int> associate
final keys = await deriveEncryptionKeys(mk, encryptHkdfInfoString);
final ciphertext = await aes256CbcEncrypt(plaintext, keys.encryptionKey, keys.iv);
final header = OMEMOMessage.fromBuffer(associatedData.sublist(sessionAd.length))
final header = OmemoMessage.fromBuffer(associatedData.sublist(sessionAd.length))
..ciphertext = ciphertext;
final headerBytes = header.writeToBuffer();
final hmacInput = concat([sessionAd, headerBytes]);
final hmacResult = await truncatedHmac(hmacInput, keys.authenticationKey);
final message = OMEMOAuthenticatedMessage()
final message = OmemoAuthenticatedMessage()
..mac = hmacResult
..message = headerBytes;
return message.writeToBuffer();
@ -33,15 +34,15 @@ Future<List<int>> decrypt(List<int> mk, List<int> ciphertext, List<int> associat
final keys = await deriveEncryptionKeys(mk, encryptHkdfInfoString);
// Assumption ciphertext is a OMEMOAuthenticatedMessage
final message = OMEMOAuthenticatedMessage.fromBuffer(ciphertext);
final header = OMEMOMessage.fromBuffer(message.message);
final message = OmemoAuthenticatedMessage.fromBuffer(ciphertext);
final header = OmemoMessage.fromBuffer(message.message!);
final hmacInput = concat([sessionAd, header.writeToBuffer()]);
final hmacResult = await truncatedHmac(hmacInput, keys.authenticationKey);
if (!listsEqual(hmacResult, message.mac)) {
if (!listsEqual(hmacResult, message.mac!)) {
throw InvalidMessageHMACException();
}
return aes256CbcDecrypt(header.ciphertext, keys.encryptionKey, keys.iv);
return aes256CbcDecrypt(header.ciphertext!, keys.encryptionKey, keys.iv);
}