veilid/veilid-flutter/lib/veilid_crypto.dart
2023-05-29 19:24:57 +00:00

168 lines
5.0 KiB
Dart

import 'dart:async';
import 'dart:typed_data';
import 'package:charcode/charcode.dart';
import 'veilid_encoding.dart';
import 'veilid.dart';
//////////////////////////////////////
/// CryptoKind
typedef CryptoKind = int;
const CryptoKind cryptoKindVLD0 =
$V << 0 | $L << 8 | $D << 16 | $0 << 24; // "VLD0"
const CryptoKind cryptoKindNONE =
$N << 0 | $O << 8 | $N << 16 | $E << 24; // "NONE"
String cryptoKindToString(CryptoKind kind) {
return "${String.fromCharCode(kind & 0xFF)}${String.fromCharCode((kind >> 8) & 0xFF)}${String.fromCharCode((kind >> 16) & 0xFF)}${String.fromCharCode((kind >> 24) & 0xFF)}";
}
CryptoKind cryptoKindFromString(String s) {
if (s.codeUnits.length != 4) {
throw const FormatException("malformed string");
}
CryptoKind kind = s.codeUnits[0] |
s.codeUnits[1] << 8 |
s.codeUnits[2] << 16 |
s.codeUnits[3] << 24;
return kind;
}
//////////////////////////////////////
/// Types
class Typed<V extends EncodedString> {
late CryptoKind kind;
late V value;
Typed({required this.kind, required this.value});
@override
String toString() {
return "${cryptoKindToString(kind)}:$value";
}
Typed.fromString(String s) {
var parts = s.split(":");
if (parts.length < 2 || parts[0].codeUnits.length != 4) {
throw const FormatException("malformed string");
}
kind = parts[0].codeUnits[0] |
parts[0].codeUnits[1] << 8 |
parts[0].codeUnits[2] << 16 |
parts[0].codeUnits[3] << 24;
value = EncodedString.fromString<V>(parts.sublist(1).join(":"));
}
String toJson() {
return toString();
}
Typed.fromJson(dynamic json) : this.fromString(json as String);
}
class KeyPair {
late PublicKey key;
late PublicKey secret;
KeyPair({required this.key, required this.secret});
@override
String toString() {
return "${key.toString()}:${secret.toString()}";
}
KeyPair.fromString(String s) {
var parts = s.split(":");
if (parts.length != 2 ||
parts[0].codeUnits.length != 43 ||
parts[1].codeUnits.length != 43) {
throw const FormatException("malformed string");
}
key = PublicKey(parts[0]);
secret = PublicKey(parts[1]);
}
String toJson() {
return toString();
}
KeyPair.fromJson(dynamic json) : this.fromString(json as String);
}
class TypedKeyPair {
late CryptoKind kind;
late PublicKey key;
late PublicKey secret;
TypedKeyPair({required this.kind, required this.key, required this.secret});
@override
String toString() {
return "${cryptoKindToString(kind)}:${key.toString()}:${secret.toString()}";
}
TypedKeyPair.fromString(String s) {
var parts = s.split(":");
if (parts.length != 3 ||
parts[0].codeUnits.length != 4 ||
parts[1].codeUnits.length != 43 ||
parts[2].codeUnits.length != 43) {
throw VeilidAPIExceptionInvalidArgument("malformed string", "s", s);
}
kind = cryptoKindFromString(parts[0]);
key = PublicKey(parts[1]);
secret = PublicKey(parts[2]);
}
String toJson() {
return toString();
}
TypedKeyPair.fromJson(dynamic json) : this.fromString(json as String);
}
typedef CryptoKey = FixedEncodedString43;
typedef Signature = FixedEncodedString86;
typedef Nonce = FixedEncodedString32;
typedef PublicKey = CryptoKey;
typedef SecretKey = CryptoKey;
typedef HashDigest = CryptoKey;
typedef SharedSecret = CryptoKey;
typedef CryptoKeyDistance = CryptoKey;
typedef TypedKey = Typed<CryptoKey>;
typedef TypedSignature = Typed<Signature>;
//////////////////////////////////////
/// VeilidCryptoSystem
abstract class VeilidCryptoSystem {
CryptoKind kind();
Future<SharedSecret> cachedDH(PublicKey key, SecretKey secret);
Future<SharedSecret> computeDH(PublicKey key, SecretKey secret);
Future<Uint8List> randomBytes(int len);
Future<int> defaultSaltLength();
Future<String> hashPassword(Uint8List password, Uint8List salt);
Future<bool> verifyPassword(Uint8List password, String passwordHash);
Future<SharedSecret> deriveSharedSecret(Uint8List password, Uint8List salt);
Future<Nonce> randomNonce();
Future<SharedSecret> randomSharedSecret();
Future<KeyPair> generateKeyPair();
Future<HashDigest> generateHash(Uint8List data);
//Future<HashDigest> generateHashReader(Stream<List<int>> reader);
Future<bool> validateKeyPair(PublicKey key, SecretKey secret);
Future<bool> validateHash(Uint8List data, HashDigest hash);
//Future<bool> validateHashReader(Stream<List<int>> reader, HashDigest hash);
Future<CryptoKeyDistance> distance(CryptoKey key1, CryptoKey key2);
Future<Signature> sign(PublicKey key, SecretKey secret, Uint8List data);
Future<void> verify(PublicKey key, Uint8List data, Signature signature);
Future<int> aeadOverhead();
Future<Uint8List> decryptAead(Uint8List body, Nonce nonce,
SharedSecret sharedSecret, Uint8List? associatedData);
Future<Uint8List> encryptAead(Uint8List body, Nonce nonce,
SharedSecret sharedSecret, Uint8List? associatedData);
Future<Uint8List> cryptNoAuth(
Uint8List body, Nonce nonce, SharedSecret sharedSecret);
}