基于最新版的flutter pointycastle: ^3.9.1的AES加密

自己添加pointycastle: ^3.9.1库

config.dart

import 'dart:convert';
import 'dart:typed_data';class Config {static String password = '成都推理计算科技'; // 16字节(128位)的AES密钥static Uint8List iv = Uint8List.fromList([0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]); // 初始化向量（IV），对于AES/CBC/PKCS7Padding是必需的。自己按照ASCII表填点对自己有用的static int aesSize = 128;//可以填128,192,256static String aesSalt=latin1.decode([10, 120, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);//salt可以用库里面的函数生成
}

aes_encrypt.dart

import 'dart:convert';
import 'dart:typed_data';import 'package:pointycastle/pointycastle.dart';
import 'package:pointycastle/src/platform_check/platform_check.dart';
import 'config.dart';class AesEncrypt {final iv = Config.iv;final password = Config.password;final aesSize = Config.aesSize;final aesSalt = Config.aesSalt;AesEncrypt();Uint8List aesCbcEncrypt(Uint8List key, Uint8List iv, Uint8List paddedPlaintext) {if (![128, 192, 256].contains(key.length * 8)) {throw ArgumentError.value(key, 'key', 'invalid key length for AES');}if (iv.length * 8 != 128) {throw ArgumentError.value(iv, 'iv', 'invalid IV length for AES');}if (paddedPlaintext.length * 8 % 128 != 0) {throw ArgumentError.value(paddedPlaintext, 'paddedPlaintext', 'invalid length for AES');}final cbc = BlockCipher('AES/CBC')..init(true, ParametersWithIV(KeyParameter(key), iv)); // true=encryptfinal cipherText = Uint8List(paddedPlaintext.length); // allocate spacevar offset = 0;while (offset < paddedPlaintext.length) {offset += cbc.processBlock(paddedPlaintext, offset, cipherText, offset);}assert(offset == paddedPlaintext.length);return cipherText;}Uint8List aesCbcDecrypt(Uint8List key, Uint8List iv, Uint8List cipherText) {if (![128, 192, 256].contains(key.length * 8)) {throw ArgumentError.value(key, 'key', 'invalid key length for AES');}if (iv.length * 8 != 128) {throw ArgumentError.value(iv, 'iv', 'invalid IV length for AES');}if (cipherText.length * 8 % 128 != 0) {throw ArgumentError.value(cipherText, 'cipherText', 'invalid length for AES');}final cbc = BlockCipher('AES/CBC')..init(false, ParametersWithIV(KeyParameter(key), iv)); // false=decryptfinal paddedPlainText = Uint8List(cipherText.length); // allocate spacevar offset = 0;while (offset < cipherText.length) {offset += cbc.processBlock(cipherText, offset, paddedPlainText, offset);}assert(offset == cipherText.length);return paddedPlainText;}String bin2hex(Uint8List bytes, {String? separator, int? wrap}) {var len = 0;final buf = StringBuffer();for (final b in bytes) {final s = b.toRadixString(16);if (buf.isNotEmpty && separator != null) {buf.write(separator);len += separator.length;}if (wrap != null && wrap < len + 2) {buf.write('\n');len = 0;}buf.write('${(s.length == 1) ? '0' : ''}$s');len += 2;}return buf.toString();}Uint8List hex2bin(String hexStr) {if (hexStr.length % 2 != 0) {throw const FormatException('not an even number of hexadecimal characters');}final result = Uint8List(hexStr.length ~/ 2);for (var i = 0; i < result.length; i++) {result[i] = int.parse(hexStr.substring(2 * i, 2 * (i + 1)), radix: 16);}return result;}Uint8List pad(Uint8List bytes, int blockSizeBytes) {final padLength = blockSizeBytes - (bytes.length % blockSizeBytes);final padded = Uint8List(bytes.length + padLength)..setAll(0, bytes);Padding('PKCS7').addPadding(padded, bytes.length);return padded;}Uint8List unpad(Uint8List padded) => padded.sublist(0, padded.length - Padding('PKCS7').padCount(padded));Uint8List passphraseToKey(String passPhrase, {String salt = '', int iterations = 30000, required int bitLength}) {if (![128, 192, 256].contains(bitLength)) {throw ArgumentError.value(bitLength, 'bitLength', 'invalid for AES');}final numBytes = bitLength ~/ 8;final kd = KeyDerivator('SHA-256/HMAC/PBKDF2')..init(Pbkdf2Parameters(utf8.encode(salt), iterations, numBytes));return kd.process(utf8.encode(passPhrase));}Uint8List? generateRandomBytes(int numBytes) {if (_secureRandom == null) {// First invocation: create _secureRandom and seed it_secureRandom = SecureRandom('Fortuna');_secureRandom!.seed(KeyParameter(Platform.instance.platformEntropySource().getBytes(32)));}// Use it to generate the random bytesfinal iv = _secureRandom!.nextBytes(numBytes);return iv;}SecureRandom? _secureRandom;Uint8List encrypt(String textToEncrypt) {final cipherText = aesCbcEncrypt(passphraseToKey(password, salt: aesSalt, bitLength: aesSize), iv, pad(utf8.encode(textToEncrypt), 16));return cipherText;}String decrypt(List<int> cipherListInt) {Uint8List cipherText = Uint8List.fromList(cipherListInt);final paddedDecryptedBytes =aesCbcDecrypt(passphraseToKey(password, salt: aesSalt, bitLength: aesSize), iv, cipherText);final decryptedBytes = unpad(paddedDecryptedBytes);final decryptedText = utf8.decode(decryptedBytes);return decryptedText;}
}