WinPhone7手机中的AES加密，解密算法

using System;

using System.Security.Cryptography;

using System.Text;

using System.IO;



namespace SheenClient.classes.eventhandler

{

    /// <summary>



    /// AES解密算法类



    /// </summary>



    public class AESEncryption

    {

        /// <summary>



        /// 默认密钥向量



        /// </summary>



        private static string salt = "PasswordSalt";



        /// <summary>



        /// 进行AES加密算法



        /// </summary>



        /// <param name="dataToEncrypt">要进行加密的字符串</param>



        /// <param name="key">进行加密的键</param>



        /// <returns>加密后的字符串</returns>



        public static string AesEncrypt(string dataToEncrypt, string key)

        {

            AesManaged aes = null;

            MemoryStream memoryStream = null;

            CryptoStream cryptoStream = null;



            try

            {

                //Generate a Key based on a Password, Salt and HMACSHA1 pseudo-random number generator 



                Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(key, Encoding.UTF8.GetBytes(salt));



                //Create AES algorithm with 256 bit key and 128-bit block size 



                aes = new AesManaged();

                aes.Key = rfc2898.GetBytes(aes.KeySize / 8);

                aes.IV = rfc2898.GetBytes(aes.BlockSize / 8);



                //Create Memory and Crypto Streams 



                memoryStream = new MemoryStream();

                cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write);



                //Encrypt Data 



                byte[] data = Encoding.UTF8.GetBytes(dataToEncrypt);

                cryptoStream.Write(data, 0, data.Length);

                cryptoStream.FlushFinalBlock();



                //Return Base 64 String 



                return Convert.ToBase64String(memoryStream.ToArray());

            }

            finally

            {

                if (cryptoStream != null)

                    cryptoStream.Close();



                if (memoryStream != null)

                    memoryStream.Close();



                if (aes != null)

                    aes.Clear();

            }

        }



        /// <summary>



        /// 进行AES解密



        /// </summary>



        /// <param name="dataToDecrypt">要进行解密的字符串</param>



        /// <param name="key">解密使用的键</param>



        /// <returns>解密后的明文字符串</returns>



        public static string AesDecrypt(string dataToDecrypt, string key)

        {

            AesManaged aes = null;

            MemoryStream memoryStream = null;

            CryptoStream cryptoStream = null;



            try

            {

                //Generate a Key based on a Password, Salt and HMACSHA1 pseudo-random number generator 



                Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(key, Encoding.UTF8.GetBytes(salt));



                //Create AES algorithm with 256 bit key and 128-bit block size 



                aes = new AesManaged();

                aes.Key = rfc2898.GetBytes(aes.KeySize / 8);

                aes.IV = rfc2898.GetBytes(aes.BlockSize / 8);



                //Create Memory and Crypto Streams 



                memoryStream = new MemoryStream();

                cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write);



                //Decrypt Data 



                byte[] data = Convert.FromBase64String(dataToDecrypt);

                cryptoStream.Write(data, 0, data.Length);

                cryptoStream.FlushFinalBlock();



                //Return Decrypted String 



                byte[] decryptBytes = memoryStream.ToArray();

                return Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);

            }

            finally

            {

                if (cryptoStream != null)

                    cryptoStream.Close();



                if (memoryStream != null)

                    memoryStream.Close();



                if (aes != null)

                    aes.Clear();

            }

        } 

    }

}