update version
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@@ -1,107 +1,235 @@
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import 'dart:convert';
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import 'dart:typed_data';
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import 'package:pointycastle/export.dart';
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class AesDecrypt {
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static const String _cn = 'i0.a';
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static const List<int> _obf = <int>[
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0xED,
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0x7A,
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0x7F,
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0x3F,
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0x9E,
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0x6E,
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0xE7,
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0xF9,
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0x06,
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0xA0,
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0xA8,
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0xE4,
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0x16,
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0xE5,
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0x69,
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0x70,
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];
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/// Java String.hashCode() 等价实现（32-bit signed）
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static int javaStringHashCode(String str) {
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int h = 0;
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for (int i = 0; i < str.length; i++) {
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h = _toSigned32(h * 31 + str.codeUnitAt(i));
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}
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return h;
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}
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static int _toSigned32(int value) {
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value &= 0xFFFFFFFF;
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if ((value & 0x80000000) != 0) {
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return value - 0x100000000;
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}
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return value;
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}
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static int _unsignedRightShift32(int value, int shift) {
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return (value & 0xFFFFFFFF) >> shift;
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}
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static Uint8List deriveKeyBytes16() {
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final int seed = _toSigned32(javaStringHashCode(_cn) ^ 0x5f3759df);
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final Uint8List keyBytes = Uint8List(16);
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for (int i = 0; i < 16; i++) {
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final int shift = (i & 3) * 8;
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final int shifted = _unsignedRightShift32(seed, shift);
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final int mask = (((shifted & 0xff) ^ ((i * 17 + 31) & 0xff)) & 0xff);
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keyBytes[i] = (_obf[i] ^ mask) & 0xff;
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}
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return keyBytes;
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}
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static Uint8List _aesEcbPkcs7(bool forEncryption, Uint8List input) {
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final key = deriveKeyBytes16();
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final cipher = PaddedBlockCipherImpl(
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PKCS7Padding(),
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ECBBlockCipher(AESEngine()),
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);
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cipher.init(
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forEncryption,
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PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
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KeyParameter(key),
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null,
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),
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);
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return cipher.process(input);
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}
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/// 对应 JS / Java encrypt(String) -> Base64.NO_WRAP
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static String encrypt(String plainText) {
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try {
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final Uint8List input = Uint8List.fromList(utf8.encode(plainText));
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final Uint8List encrypted = _aesEcbPkcs7(true, input);
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return base64.encode(encrypted);
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} catch (_) {
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return '';
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}
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}
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/// 对应 JS / Java decrypt(String base64Encrypted) -> UTF-8
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static String? decrypt(String base64Encrypted) {
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try {
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final Uint8List encrypted = Uint8List.fromList(
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base64.decode(base64Encrypted),
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);
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final Uint8List decrypted = _aesEcbPkcs7(false, encrypted);
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final String text = utf8.decode(decrypted, allowMalformed: false);
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return text.isNotEmpty ? text : null;
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} catch (_) {
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return null;
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}
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}
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}
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import 'dart:convert';
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import 'dart:typed_data';
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import 'package:pointycastle/export.dart';
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class AesDecrypt {
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static const String _cn = 'i0.a';
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static const List<int> _obf = <int>[
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0xED,
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0x7A,
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0x7F,
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0x3F,
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0x9E,
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0x6E,
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0xE7,
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0xF9,
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0x06,
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0xA0,
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0xA8,
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0xE4,
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0x16,
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0xE5,
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0x69,
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0x70,
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];
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/// Java String.hashCode() 等价实现（32-bit signed）
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static int javaStringHashCode(String str) {
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int h = 0;
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for (int i = 0; i < str.length; i++) {
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h = _toSigned32(h * 31 + str.codeUnitAt(i));
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}
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return h;
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}
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static int _toSigned32(int value) {
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value &= 0xFFFFFFFF;
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if ((value & 0x80000000) != 0) {
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return value - 0x100000000;
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}
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return value;
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}
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static int _unsignedRightShift32(int value, int shift) {
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return (value & 0xFFFFFFFF) >> shift;
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}
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static Uint8List deriveKeyBytes16() {
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final int seed = _toSigned32(javaStringHashCode(_cn) ^ 0x5f3759df);
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final Uint8List keyBytes = Uint8List(16);
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for (int i = 0; i < 16; i++) {
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final int shift = (i & 3) * 8;
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final int shifted = _unsignedRightShift32(seed, shift);
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final int mask = (((shifted & 0xff) ^ ((i * 17 + 31) & 0xff)) & 0xff);
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keyBytes[i] = (_obf[i] ^ mask) & 0xff;
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}
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return keyBytes;
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}
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static Uint8List _aesEcbPkcs7(bool forEncryption, Uint8List input) {
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final key = deriveKeyBytes16();
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final cipher = PaddedBlockCipherImpl(
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PKCS7Padding(),
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ECBBlockCipher(AESEngine()),
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);
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cipher.init(
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forEncryption,
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PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
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KeyParameter(key),
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null,
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),
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);
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return cipher.process(input);
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}
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/// 对应 JS / Java encrypt(String) -> Base64.NO_WRAP
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static String encrypt(String plainText) {
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try {
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final Uint8List input = Uint8List.fromList(utf8.encode(plainText));
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final Uint8List encrypted = _aesEcbPkcs7(true, input);
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return base64.encode(encrypted);
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} catch (_) {
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return '';
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}
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}
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/// 对应 JS / Java decrypt(String base64Encrypted) -> UTF-8
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static String? decrypt(String base64Encrypted) {
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try {
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final Uint8List encrypted = Uint8List.fromList(
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base64.decode(base64Encrypted),
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);
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final Uint8List decrypted = _aesEcbPkcs7(false, encrypted);
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final String text = utf8.decode(decrypted, allowMalformed: false);
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return text.isNotEmpty ? text : null;
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} catch (_) {
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return null;
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}
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}
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// =========================
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// 新增：支持自定义 key / iv
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// AES/CBC/PKCS7
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// =========================
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static Uint8List _normalizeKey(String key) {
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final Uint8List keyBytes = Uint8List.fromList(utf8.encode(key));
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if (keyBytes.length != 16 &&
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keyBytes.length != 24 &&
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keyBytes.length != 32) {
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throw ArgumentError('AES key length must be 16/24/32 bytes.');
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}
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return keyBytes;
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}
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static Uint8List _normalizeIv(String iv) {
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final Uint8List ivBytes = Uint8List.fromList(utf8.encode(iv));
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if (ivBytes.length != 16) {
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throw ArgumentError('AES CBC iv length must be 16 bytes.');
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}
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return ivBytes;
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}
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static Uint8List _aesCbcPkcs7(
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bool forEncryption,
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Uint8List input,
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Uint8List key,
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Uint8List iv,
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) {
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final cipher = PaddedBlockCipherImpl(
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PKCS7Padding(),
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CBCBlockCipher(AESEngine()),
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);
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cipher.init(
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forEncryption,
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PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
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ParametersWithIV<KeyParameter>(KeyParameter(key), iv),
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null,
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),
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);
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return cipher.process(input);
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}
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/// 使用传入 key / iv 加密，返回 Base64
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///
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/// key 长度必须为 16 / 24 / 32 字节
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/// iv 长度必须为 16 字节
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static String encryptWithKeyIv(
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String plainText, {
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required String key,
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required String iv,
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}) {
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try {
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final Uint8List input = Uint8List.fromList(utf8.encode(plainText));
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final Uint8List keyBytes = _normalizeKey(key);
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final Uint8List ivBytes = _normalizeIv(iv);
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final Uint8List encrypted = _aesCbcPkcs7(true, input, keyBytes, ivBytes);
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return base64.encode(encrypted);
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} catch (_) {
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return '';
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}
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}
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/// 使用传入 key / iv 解密 Base64 密文，返回 UTF-8 字符串
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///
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/// key 长度必须为 16 / 24 / 32 字节
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/// iv 长度必须为 16 字节
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static String? decryptWithKeyIv(
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String base64Encrypted, {
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required String key,
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required String iv,
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}) {
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try {
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final Uint8List encrypted = Uint8List.fromList(
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base64.decode(base64Encrypted),
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);
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final Uint8List keyBytes = _normalizeKey(key);
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final Uint8List ivBytes = _normalizeIv(iv);
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final Uint8List decrypted = _aesCbcPkcs7(
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false,
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encrypted,
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keyBytes,
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ivBytes,
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);
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final String text = utf8.decode(decrypted, allowMalformed: false);
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return text.isNotEmpty ? text : null;
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} catch (_) {
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return null;
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}
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}
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// =========================
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// 可选新增：支持直接传 Uint8List
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// =========================
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static Uint8List encryptBytesWithKeyIv(
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Uint8List plainBytes, {
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required Uint8List key,
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required Uint8List iv,
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}) {
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if (key.length != 16 && key.length != 24 && key.length != 32) {
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throw ArgumentError('AES key length must be 16/24/32 bytes.');
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}
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if (iv.length != 16) {
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throw ArgumentError('AES CBC iv length must be 16 bytes.');
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}
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return _aesCbcPkcs7(true, plainBytes, key, iv);
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}
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static Uint8List decryptBytesWithKeyIv(
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Uint8List encryptedBytes, {
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required Uint8List key,
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required Uint8List iv,
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}) {
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if (key.length != 16 && key.length != 24 && key.length != 32) {
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throw ArgumentError('AES key length must be 16/24/32 bytes.');
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}
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if (iv.length != 16) {
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throw ArgumentError('AES CBC iv length must be 16 bytes.');
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}
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return _aesCbcPkcs7(false, encryptedBytes, key, iv);
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}
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}
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