将用 C# 编写的解密代码迁移到 Apex

Question

在C#中

class AES256CBC
    {
        public static string HexToString(string hexString)
        {
            // Remove any spaces or other non-hex characters from the input string
            hexString = Regex.Replace(hexString, "[^0-9a-fA-F]", "");

            // Convert each pair of hex digits into a byte and add it to a byte array
            byte[] byteArray = new byte[hexString.Length / 2];
            for (int i = 0; i < hexString.Length; i += 2)
            {
                byteArray[i / 2] = Convert.ToByte(hexString.Substring(i, 2), 16);
            }

            // Convert the byte array to a string using the default encoding
            string result = Encoding.Default.GetString(byteArray);

            return result;
        }
        public static byte[] StringToByteArray(string hex)
        {
            return Enumerable.Range(0, hex.Length)
                             .Where(x => x % 2 == 0)
                             .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
                             .ToArray();
        }
        public static byte[] GetByteArrayFromStr(string str, int count)
        {
            byte[] byteArray = new byte[count];

            // Copy the first 32 characters of the string into the byte array
            for (int i = 0; i < count && i < str.Length; i++)
            {
                byteArray[i] = (byte)str[i];
            }
            return byteArray;
        }
        static string ByteArrayToHexViaByteManipulation2(byte[] bytes)
        {
            char[] c = new char[bytes.Length * 2];
            int b;
            for (int i = 0; i < bytes.Length; i++)
            {
                b = bytes[i] >> 4;
                c[i * 2] = (char)(55 + b + (((b - 10) >> 31) & -7));
                b = bytes[i] & 0xF;
                c[i * 2 + 1] = (char)(55 + b + (((b - 10) >> 31) & -7));
            }
            return new string(c);
        }

        public string Decrypt(string Key, string EncryptedStr)
        {
            var aes = CreateAES(Key);
            string hexiv = EncryptedStr.Substring(0, 32);
            string hexencstr = EncryptedStr.Substring(32);
            aes.IV = StringToByteArray(hexiv);
            ICryptoTransform ct = aes.CreateDecryptor();
            byte[] clearBytes = StringToByteArray(hexencstr);
            byte[] output = ct.TransformFinalBlock(clearBytes, 0, clearBytes.Length);
            ct.Dispose();
            string unencr = Encoding.UTF8.GetString(output);
            return unencr;
        }

        public string Encrypt(string Key, string StringToEncrypt)
        {
            var aes = CreateAES(Key);
            aes.GenerateIV();
            var ct = aes.CreateEncryptor();
            byte[] clearBytes = Encoding.UTF8.GetBytes(StringToEncrypt);
            var output = ct.TransformFinalBlock(clearBytes, 0, clearBytes.Length);
            string unencr = ByteArrayToHexViaByteManipulation2(aes.IV) + ByteArrayToHexViaByteManipulation2(output);
            return unencr;
        }


        private static Aes CreateAES(string key)
        {
            Aes algorithm = new AesCryptoServiceProvider();
            //set the mode, padding and block size
            algorithm.Padding = PaddingMode.Zeros;
            algorithm.Mode = CipherMode.CBC;
            algorithm.KeySize = 256;
            algorithm.BlockSize = 128;
            algorithm.GenerateIV();
            algorithm.Key = GetByteArrayFromStr(key, 32);
            return algorithm;
        }
    }

我想要 Apex 中的类似代码。我尝试使用下面的顶点代码解密从 C# 接收到的字符串，但它不起作用。它抱怨有一个错误的密钥。有人可以帮忙吗？

Blob secretKey = Blob.valueOf('78A52519043F9C61CEDDECAFC0FFEE39');
Blob encryptedData = Blob.valueOf('896F4DE1B142A76E846855A74475939E56697327FC41CB8FAA328766EF7A8B897AEE86070462B621792B8E6B569952C5715BD9484601C397554E25BCE52BF2468364E927168609785FB09469F5C06C9C');
Blob vector = Blob.valueOf('011C7B86231CE243');

Blob decryptedData = System.Crypto.decryptWithManagedIV('AES256', secretKey, encryptedData);