Remove old API
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@ -1,22 +0,0 @@
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// Copyright (c) 2020
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// Author: Hugo Pointcheval
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class KeyException implements Exception {
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String message;
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KeyException(this.message);
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}
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class EncryptionException implements Exception {
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String message;
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EncryptionException(this.message);
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}
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class DecryptionException implements Exception {
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String message;
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DecryptionException(this.message);
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}
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class NotImplementedException implements Exception {
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String message;
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NotImplementedException(this.message);
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}
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@ -1,88 +0,0 @@
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// Copyright (c) 2020
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// Author: Hugo Pointcheval
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import 'dart:async';
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import 'dart:typed_data';
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import 'package:flutter/services.dart';
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import 'package:native_crypto/exceptions.dart';
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/// [Sources]
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/// Plugin class.
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/// Contains raw functions and specific platform calls.
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///
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/// Use [symmetrical_crypto] for an **AES Layer API**.
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class NativeCrypto {
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/// [Private]
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/// Contains the channel for platform specific code.
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static const MethodChannel _channel =
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const MethodChannel('native.crypto.helper');
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/// PBKDF2.
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///
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/// [keyLength] is in Bytes.
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/// It returns an `Uint8List`.
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Future<Uint8List> pbkdf2(String password, String salt, {int keyLength: 32, int iteration: 10000, String algorithm: 'sha256'}) async {
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Uint8List key;
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try {
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key = await _channel.invokeMethod('pbkdf2', <String, dynamic>{
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'password': password,
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'salt': salt,
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'keyLength': keyLength,
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'iteration': iteration,
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'algorithm': algorithm,
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});
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} on PlatformException catch (e) {
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throw e;
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}
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return key;
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}
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/// Generates AES key.
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///
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/// [size] is in bits, 128, 192 or 256.
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/// It returns an `Uint8List`.
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Future<Uint8List> symKeygen(int size) async {
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Uint8List aesKey;
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try {
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aesKey = await _channel.invokeMethod('symKeygen', <String, dynamic>{
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'size': size,
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});
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} on PlatformException catch (e) {
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throw e;
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}
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return aesKey;
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}
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/// Encrypts passed data with a given AES key.
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///
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/// Generates a random **IV**. Returns a list
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/// of `Uint8List` with encrypted cipher as first
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/// and IV as second member.
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Future<List<Uint8List>> symEncrypt(
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Uint8List payloadbytes, Uint8List aesKey) async {
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final List<Uint8List> encryptedPayload =
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await _channel.invokeListMethod('symEncrypt', <String, dynamic>{
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'payload': payloadbytes,
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'aesKey': aesKey,
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});
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return encryptedPayload;
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}
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/// Decrypts a passed payload with a given AES key.
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///
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/// The payload must be a list of `Uint8List`
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/// with encrypted cipher as first and IV as second member.
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Future<Uint8List> symDecrypt(
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List<Uint8List> payloadbytes, Uint8List aesKey) async {
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Uint8List decryptedPayload;
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try {
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decryptedPayload = await _channel.invokeMethod('symDecrypt', <String, dynamic>{
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'payload': payloadbytes,
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'aesKey': aesKey,
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});
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} on PlatformException catch (e) {
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throw DecryptionException(e.message);
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}
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return decryptedPayload;
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}
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}
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@ -1,203 +0,0 @@
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// Copyright (c) 2020
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// Author: Hugo Pointcheval
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import 'dart:async';
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import 'dart:developer';
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import 'dart:typed_data';
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import 'package:flutter/services.dart';
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import 'src/native_crypto.dart';
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import 'exceptions.dart';
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const String TAG_ERROR = 'error.native_crypto.symmetric_crypto';
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const String TAG_DEBUG = 'debug.native_crypto.symmetric_crypto';
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/// Defines all available key sizes.
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enum KeySize { bits128, bits192, bits256 }
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/// Defines all available digest.
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enum Digest { sha1, sha256, sha512 }
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/// Defines all available ciphers.
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enum Cipher { AES }
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/// Key Helper
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///
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/// You can generate Secret keys of different sizes.
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class KeyGenerator {
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/// Generate a secret key.
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///
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/// You can specify a `keySize`. Default is **256 bits**.
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/// It returns an `Uint8List`.
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Future<Uint8List> secretKey({KeySize keySize = KeySize.bits256}) async {
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Map<KeySize, int> availableSizes = {
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KeySize.bits128: 128,
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KeySize.bits192: 192,
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KeySize.bits256: 256
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};
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int size = availableSizes[keySize];
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Uint8List key;
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try {
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key = await NativeCrypto().symKeygen(size);
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log("KEY LENGTH: ${key.length}", name: TAG_DEBUG);
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} on PlatformException catch (e) {
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log(e.message, name: TAG_ERROR);
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throw e;
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}
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return key;
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}
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/// PBKDF2.
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///
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/// `keyLength` is in Bytes.
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/// It returns an `Uint8List`.
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Future<Uint8List> pbkdf2(String password, String salt,
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{int keyLength: 32,
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int iteration: 10000,
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Digest digest: Digest.sha256}) async {
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Uint8List key;
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Map<Digest, String> availableDigests = {
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Digest.sha1: 'sha1',
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Digest.sha256: 'sha256',
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Digest.sha512: 'sha512',
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};
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String algo = availableDigests[digest];
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try {
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key = await NativeCrypto().pbkdf2(password, salt,
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keyLength: keyLength, iteration: iteration, algorithm: algo);
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log("PBKDF2 KEY LENGTH: ${key.length} | DIGEST: $algo", name: TAG_DEBUG);
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} on PlatformException catch (e) {
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log(e.message, name: TAG_ERROR);
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throw e;
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}
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return key;
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}
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}
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/// AES Helper
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///
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/// You can encrypt and decrypt data.
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class AES {
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Uint8List _key;
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bool _isInitialized = false;
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KeySize _keySize;
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/// You can pass a key in constructor.
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AES({Uint8List key}) {
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this._key = key;
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try {
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this._isInitialized = _testKey();
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} on KeyException catch (e) {
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this._isInitialized = false;
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throw e;
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}
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}
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/// This key is used for encryption and decryption.
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Uint8List get key => this._key;
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/// Check if the AES object is intialized with a valid key before perform any operation.
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bool get isInitialized => this._isInitialized;
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/// Defines the size of the generated or passed key.
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KeySize get keySize => this._keySize;
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/// [Private]
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/// Tests if the key is valid.
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///
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/// The key must be 128, 192 or 256 bits long.
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bool _testKey() {
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if (this.key != null) {
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switch (this.key.length) {
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case 16:
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this._keySize = KeySize.bits128;
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break;
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case 24:
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this._keySize = KeySize.bits192;
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break;
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case 32:
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this._keySize = KeySize.bits256;
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break;
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default:
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var error = 'Invalid key length: ${this.key.length} Bytes';
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log(error, name: TAG_ERROR);
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throw KeyException(error);
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}
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return true;
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} else {
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return false;
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}
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}
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/// Generate an AES key.
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///
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/// You have to specify a `keySize`.
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/// Return `null` if the key is already set.
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init(KeySize keySize) async {
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if (this.key != null) return null;
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this._keySize = keySize;
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try {
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this._key = await KeyGenerator().secretKey(keySize: keySize);
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} on PlatformException catch (e) {
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log(e.message, name: TAG_ERROR);
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}
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try {
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this._isInitialized = _testKey();
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} on KeyException catch (e) {
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this._isInitialized = false;
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throw e;
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}
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}
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/// Encrypts data.
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///
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/// Takes `Uint8List` data as parameter.
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/// And returns an `Uint8List` **list**.
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///
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/// You can pass a different key.
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///
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/// The first member of this list is the `cipher data`,
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/// and the second member is the `IV`.
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Future<List<Uint8List>> encrypt(Uint8List data, {Uint8List key}) async {
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if (!this._isInitialized && key == null)
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throw EncryptionException(
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'Instance not initialized. You can pass a key directly in encrypt method.');
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List<Uint8List> encryptedPayload =
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await NativeCrypto().symEncrypt(data, key ?? this.key);
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return encryptedPayload;
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}
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/// Decrypts data.
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///
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/// Takes `Uint8List` **list** as parameter.
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/// And returns plain text data as `Uint8List`.
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///
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/// You can pass a different key.
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Future<Uint8List> decrypt(List<Uint8List> encryptedPayload,
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{Uint8List key}) async {
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if (!this._isInitialized && key == null)
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throw DecryptionException(
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'Instance not initialized. You can pass a key directly in decrypt method.');
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Uint8List decryptedPayload;
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try {
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decryptedPayload =
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await NativeCrypto().symDecrypt(encryptedPayload, key ?? this.key);
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} on DecryptionException catch (e) {
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log(e.message, name: TAG_ERROR);
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throw e;
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}
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return decryptedPayload;
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}
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}
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