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encryption tools

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This commit is contained in:
Christien Rioux 2023-09-24 22:36:15 -04:00
parent 069926aba8
commit 437e21b0fe
1 changed files with 46 additions and 0 deletions
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46
veilid-flutter/lib/veilid_crypto.dart
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@ -186,6 +186,52 @@ abstract class VeilidCryptoSystem {
Future<Uint8List> cryptNoAuth(
Uint8List body, Nonce nonce, SharedSecret sharedSecret);
Future<Uint8List> encryptAeadWithNonce(
Uint8List body, SharedSecret secret) async {
// generate nonce
final nonce = await randomNonce();
// crypt and append nonce
final b = BytesBuilder()
..add(await encryptAead(body, nonce, secret, null))
..add(nonce.decode());
return b.toBytes();
}
Future<Uint8List> decryptAeadWithNonce(
Uint8List body, SharedSecret secret) async {
if (body.length < Nonce.decodedLength()) {
throw const FormatException('not enough data to decrypt');
}
final nonce =
Nonce.fromBytes(body.sublist(body.length - Nonce.decodedLength()));
final encryptedData = body.sublist(0, body.length - Nonce.decodedLength());
// decrypt
return decryptAead(encryptedData, nonce, secret, null);
}
Future<Uint8List> encryptAeadWithPassword(
Uint8List body, String password) async {
final ekbytes = Uint8List.fromList(utf8.encode(password));
final nonce = await randomNonce();
final saltBytes = nonce.decode();
final sharedSecret = await deriveSharedSecret(ekbytes, saltBytes);
return Uint8List.fromList(
(await encryptAead(body, nonce, sharedSecret, null)) + saltBytes);
}
Future<Uint8List> decryptAeadWithPassword(
Uint8List body, String password) async {
if (body.length < Nonce.decodedLength()) {
throw const FormatException('not enough data to decrypt');
}
final ekbytes = Uint8List.fromList(utf8.encode(password));
final bodyBytes = body.sublist(0, body.length - Nonce.decodedLength());
final saltBytes = body.sublist(body.length - Nonce.decodedLength());
final nonce = Nonce.fromBytes(saltBytes);
final sharedSecret = await deriveSharedSecret(ekbytes, saltBytes);
return decryptAead(bodyBytes, nonce, sharedSecret, null);
}
Future<Uint8List> encryptNoAuthWithNonce(
Uint8List body, SharedSecret secret) async {
// generate nonce