veilid/veilid-flutter/lib/veilid_crypto.dart

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import 'dart:async';
import 'dart:typed_data';
import 'package:charcode/charcode.dart';
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import 'package:equatable/equatable.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
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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 | $E << 24; // "NONE"
String cryptoKindToString(CryptoKind kind) {
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return cryptoKindToBytes(kind).map((c) => String.fromCharCode(c)).join();
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}
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const CryptoKind bestCryptoKind = cryptoKindVLD0;
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Uint8List cryptoKindToBytes(CryptoKind kind) {
var b = Uint8List(4);
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ByteData.sublistView(b).setUint32(0, kind, Endian.big);
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return b;
}
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CryptoKind cryptoKindFromString(String s) {
if (s.codeUnits.length != 4) {
throw const FormatException("malformed string");
}
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CryptoKind kind = ByteData.sublistView(Uint8List.fromList(s.codeUnits))
.getUint32(0, Endian.big);
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return kind;
}
//////////////////////////////////////
/// Types
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@immutable
class Typed<V extends EncodedString> extends Equatable {
final CryptoKind kind;
final V value;
@override
List<Object> get props => [kind, value];
const Typed({required this.kind, required this.value});
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@override
String toString() {
return "${cryptoKindToString(kind)}:$value";
}
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factory Typed.fromString(String s) {
final parts = s.split(":");
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if (parts.length < 2 || parts[0].codeUnits.length != 4) {
throw const FormatException("malformed string");
}
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final kind = cryptoKindFromString(parts[0]);
final value = EncodedString.fromString<V>(parts.sublist(1).join(":"));
return Typed(kind: kind, value: value);
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}
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Uint8List decode() {
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var b = BytesBuilder();
b.add(cryptoKindToBytes(kind));
b.add(value.decode());
return b.toBytes();
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}
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String toJson() => toString();
factory Typed.fromJson(dynamic json) => Typed.fromString(json as String);
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}
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@immutable
class KeyPair extends Equatable {
final PublicKey key;
final PublicKey secret;
@override
List<Object> get props => [key, secret];
const KeyPair({required this.key, required this.secret});
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@override
String toString() {
return "${key.toString()}:${secret.toString()}";
}
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factory KeyPair.fromString(String s) {
final parts = s.split(":");
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if (parts.length != 2 ||
parts[0].codeUnits.length != 43 ||
parts[1].codeUnits.length != 43) {
throw const FormatException("malformed string");
}
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final key = PublicKey.fromString(parts[0]);
final secret = PublicKey.fromString(parts[1]);
return KeyPair(key: key, secret: secret);
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}
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String toJson() => toString();
factory KeyPair.fromJson(dynamic json) => KeyPair.fromString(json as String);
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}
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@immutable
class TypedKeyPair extends Equatable {
final CryptoKind kind;
final PublicKey key;
final PublicKey secret;
@override
List<Object> get props => [kind, key, secret];
const TypedKeyPair(
{required this.kind, required this.key, required this.secret});
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@override
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String toString() =>
"${cryptoKindToString(kind)}:${key.toString()}:${secret.toString()}";
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factory TypedKeyPair.fromString(String s) {
final parts = s.split(":");
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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);
}
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final kind = cryptoKindFromString(parts[0]);
final key = PublicKey.fromString(parts[1]);
final secret = PublicKey.fromString(parts[2]);
return TypedKeyPair(kind: kind, key: key, secret: secret);
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}
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String toJson() => toString();
factory TypedKeyPair.fromJson(dynamic json) =>
TypedKeyPair.fromString(json as String);
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factory TypedKeyPair.fromKeyPair(CryptoKind kind, KeyPair keyPair) =>
TypedKeyPair(kind: kind, key: keyPair.key, secret: keyPair.secret);
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}
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>;
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typedef TypedSecret = Typed<SecretKey>;
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typedef TypedHashDigest = Typed<HashDigest>;
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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);
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Future<bool> validateKeyPairWithKeyPair(KeyPair keyPair) {
return validateKeyPair(keyPair.key, keyPair.secret);
}
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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);
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Future<Signature> signWithKeyPair(KeyPair keyPair, Uint8List data) {
return sign(keyPair.key, keyPair.secret, data);
}
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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);
}