asp.net AES加密跟PHP的一致，将加密的2进制byte[]转换为16进制byte[] 的字符串获得

<?php
class AESUtil {

    public static function encrypt($input, $key) {

    $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);

    $input = AESUtil::pkcs5_pad($input, $size);

    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');

    $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

    mcrypt_generic_init($td, $key, $iv);

    $data = mcrypt_generic($td, $input);

    mcrypt_generic_deinit($td);

    mcrypt_module_close($td);

    $data = strtoupper(bin2hex($data));

    return $data;

    }

    private static function pkcs5_pad ($text, $blocksize) {

        $pad = $blocksize - (strlen($text) % $blocksize);

        return $text . str_repeat(chr($pad), $pad);

    }

    public static function decrypt($sStr, $sKey) {

        $decrypted= mcrypt_decrypt(

        MCRYPT_RIJNDAEL_128,

        $sKey,

        base64_decode($sStr),

        MCRYPT_MODE_ECB

    );

        $dec_s = strlen($decrypted);

        $padding = ord($decrypted[$dec_s-1]);

        $decrypted = substr($decrypted, 0, -$padding);

        return $decrypted;

    }
}
?>

下面这个跟PHP的一样加密后，将加密的2进制byte[]转换为16进制byte[] 的字符串获得

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace pay
{
    class AESHelper
    {

        /// <summary>
        /// AES加密
        /// </summary>
        /// <param name="Data">被加密的明文</param>
        /// <param name="Key">密钥</param>
        /// <param name="Vector">向量</param>
        /// <returns>密文</returns>
        public static String AESEncrypt(String Data, String Key, String Vector)
        {
            Byte[] plainBytes = Encoding.UTF8.GetBytes(Data);

            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
            Byte[] bVector = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);

            Byte[] Cryptograph = null; // 加密后的密文  

            Rijndael Aes = Rijndael.Create();
            try
            {
                // 开辟一块内存流
                using (MemoryStream Memory = new MemoryStream())
                {
                    // 把内存流对象包装成加密流对象
                    using (CryptoStream Encryptor = new CryptoStream(Memory,
                     Aes.CreateEncryptor(bKey, bVector),
                     CryptoStreamMode.Write))
                    {
                        // 明文数据写入加密流
                        Encryptor.Write(plainBytes, , plainBytes.Length);
                        Encryptor.FlushFinalBlock();

                        Cryptograph = Memory.ToArray();
                    }
                }
            }
            catch
            {
                Cryptograph = null;
            }

            return Convert.ToBase64String(Cryptograph);
        }

        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="Data">被解密的密文</param>
        /// <param name="Key">密钥</param>
        /// <param name="Vector">向量</param>
        /// <returns>明文</returns>
        public static String AESDecrypt(String Data, String Key, String Vector)
        {
            Byte[] encryptedBytes = Convert.FromBase64String(Data);
            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
            Byte[] bVector = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);

            Byte[] original = null; // 解密后的明文  

            Rijndael Aes = Rijndael.Create();
            try
            {
                // 开辟一块内存流，存储密文
                using (MemoryStream Memory = new MemoryStream(encryptedBytes))
                {
                    // 把内存流对象包装成加密流对象
                    using (CryptoStream Decryptor = new CryptoStream(Memory,
                    Aes.CreateDecryptor(bKey, bVector),
                    CryptoStreamMode.Read))
                    {
                        // 明文存储区
                        using (MemoryStream originalMemory = new MemoryStream())
                        {
                            Byte[] Buffer = new Byte[];
                            Int32 readBytes = ;
                            while ((readBytes = Decryptor.Read(Buffer, , Buffer.Length)) > )
                            {
                                originalMemory.Write(Buffer, , readBytes);
                            }

                            original = originalMemory.ToArray();
                        }
                    }
                }
            }
            catch
            {
                original = null;
            }
            return Encoding.UTF8.GetString(original);
        }

        /// <summary>
        /// AES加密(无向量)
        /// </summary>
        /// <param name="plainBytes">被加密的明文</param>
        /// <param name="key">密钥</param>
        /// <returns>密文</returns>
        public static string AESEncrypt(String Data, String Key)
        {
            MemoryStream mStream = new MemoryStream();
            RijndaelManaged aes = new RijndaelManaged();

            byte[] plainBytes = Encoding.UTF8.GetBytes(Data);
            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);

            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = ;
           // aes.Key = bKey;
            aes.IV = Encoding.UTF8.GetBytes(Key);

            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
            try
            {
                cryptoStream.Write(plainBytes, , plainBytes.Length);
                cryptoStream.FlushFinalBlock();
                byte[] hs = mStream.ToArray();
                StringBuilder sb = new StringBuilder();
                foreach (byte b in hs)
                {
                    // 以十六进制格式格式化
                    sb.Append(b.ToString("X2"));
                }
                return sb.ToString();
             // return Convert.ToBase64String(mStream.ToArray());
              //Byte[] mStream.ToArray();
              //System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
              //String StringMessage = UTF8.GetString(mStream.ToArray());
              //return StringMessage;

            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }

        /// <summary>
        /// AES解密(无向量)
        /// </summary>
        /// <param name="encryptedBytes">被加密的明文</param>
        /// <param name="key">密钥</param>
        /// <returns>明文</returns>
        public static string AESDecrypt(String Data, String Key)
        {
            Byte[] encryptedBytes = Convert.FromBase64String(Data);
            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);

            MemoryStream mStream = new MemoryStream(encryptedBytes);
            //mStream.Write( encryptedBytes, 0, encryptedBytes.Length );
            //mStream.Seek( 0, SeekOrigin.Begin );
            RijndaelManaged aes = new RijndaelManaged();
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = ;
            aes.Key = bKey;
         //   aes.IV = _iV;
            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
            try
            {
                byte[] tmp = new byte[encryptedBytes.Length + ];
                int len = cryptoStream.Read(tmp, , encryptedBytes.Length + );
                byte[] ret = new byte[len];
                Array.Copy(tmp, , ret, , len);
                return Encoding.UTF8.GetString(ret);
            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }
//下面这一个才能对应上面的PHP版AES加密

        /// <summary>
        /// AES加密
        /// </summary>
        /// <param name="str">要加密字符串</param>
        /// <returns>返回加密后字符串</returns>
        public static String Encrypt_AES(String str,String key)
        {
            Byte[] keyArray = System.Text.UTF8Encoding.UTF8.GetBytes(key);
            Byte[] toEncryptArray = System.Text.UTF8Encoding.UTF8.GetBytes(str);

            System.Security.Cryptography.RijndaelManaged rDel = new System.Security.Cryptography.RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = System.Security.Cryptography.CipherMode.ECB;
            rDel.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

            System.Security.Cryptography.ICryptoTransform cTransform = rDel.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);

            byte[] hs = resultArray;
            StringBuilder sb = new StringBuilder();
            foreach (byte b in hs)
            {
                // 以十六进制格式格式化
                sb.Append(b.ToString("X2"));
            }
            return sb.ToString();

        }

  /// <summary>
/// AES解密
/// </summary>
/// <param name="str">要解密字符串</param>
/// <returns>返回解密后字符串</returns>
public static String Decrypt_AES(String str)
{
    Byte[] keyArray = System.Text.UTF8Encoding.UTF8.GetBytes(strAesKey);
    Byte[] toEncryptArray = Convert.FromBase64String(str);
    System.Security.Cryptography.RijndaelManaged rDel = new System.Security.Cryptography.RijndaelManaged();
    rDel.Key = keyArray;
    rDel.Mode = System.Security.Cryptography.CipherMode.ECB;
    rDel.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
    System.Security.Cryptography.ICryptoTransform cTransform = rDel.CreateDecryptor();
    Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
    return System.Text.UTF8Encoding.UTF8.GetString(resultArray);
}

    }
}

解密的时候如果不成功，其实要把16进制密文转成字节

字符串转16进制字节数组
        /// <summary>
        /// 字符串转16进制字节数组
        /// </summary>
       /// <param name="hexString"></param>
        /// <returns></returns>
        private static byte[] strToToHexByte(string hexString)
        {
             hexString = hexString.Replace(" ", "");
           if ((hexString.Length % ) != )
                 hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / ];
            for (int i = ; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * , ), );
            return returnBytes;
         }

然后在进行解密

       /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="str">要解密字符串</param>
        /// <returns>返回解密后字符串</returns>
        public static String Decrypt_AES(String str, string strAesKey,Byte[] strbyte)
        {
            Byte[] keyArray = System.Text.UTF8Encoding.UTF8.GetBytes(strAesKey);
             Byte[] toEncryptArray =Convert.FromBase64String(str);
            if (str+""=="")
            {
                 toEncryptArray = strbyte;
            }

            //Byte[] toEncryptArray = System.Text.UTF8Encoding.UTF8.GetBytes(str);

            System.Security.Cryptography.RijndaelManaged rDel = new System.Security.Cryptography.RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = System.Security.Cryptography.CipherMode.ECB;
            rDel.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

            System.Security.Cryptography.ICryptoTransform cTransform = rDel.CreateDecryptor();

            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return System.Text.UTF8Encoding.UTF8.GetString(resultArray);
        }