DES\RSA加密解密簡單用法

    <summary> 

    /// DES加密解密算法。 

    /// </summary> 

    public static class DESEncrypt

    {

        /// <summary> 

        /// 對稱加密解密的密鑰 

        /// </summary> 

        public static string EncryptKey = "12345678";//隻能8位

        /// <summary> 

        /// DES加密 

        /// </summary> 

        /// <param name="encryptString"></param> 

        /// <returns></returns> 

        public static string Encrypt(string encryptString)

        {

            byte[] keyBytes = Encoding.UTF8.GetBytes(EncryptKey);

            byte[] keyIV = keyBytes;

            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

            MemoryStream mStream = new MemoryStream();

            CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);

            cStream.Write(inputByteArray, 0, inputByteArray.Length);

            cStream.FlushFinalBlock();

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

        }

        /// <summary> 

        /// DES解密 

        /// </summary> 

        /// <param name="decryptString"></param> 

        /// <returns></returns> 

        public static string Decrypt(string decryptString)

        {

            byte[] keyBytes = Encoding.UTF8.GetBytes(EncryptKey);

            byte[] keyIV = keyBytes;

            byte[] inputByteArray = Convert.FromBase64String(decryptString);

            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

            MemoryStream mStream = new MemoryStream();

            CryptoStream cStream = new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);

            cStream.Write(inputByteArray, 0, inputByteArray.Length);

            cStream.FlushFinalBlock();

            return Encoding.UTF8.GetString(mStream.ToArray());

        }

    }

    /// <summary>

    /// RSA加密解密算法

    /// </summary>

    public static class RSAEncrypt

    {

        /// <summary> 

        /// 對稱加密解密的密鑰 

        /// </summary> 

        public static string EncryptKey = "123465654";

        public static CspParameters param;

        /// <summary> 

        /// DES加密 

        /// </summary> 

        /// <param name="encryptString"></param> 

        /// <returns></returns> 

        public static string Encrypt(string encryptString)

        {

            param = new CspParameters();

            param.KeyContainerName = EncryptKey;//密匙容器的名稱，保持加密解密一緻才能解密成功

            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))

            {

                byte[] plaindata = Encoding.Default.GetBytes(encryptString);//将要加密的字元串轉換為位元組數組

                byte[] encryptdata = rsa.Encrypt(plaindata, false);//将加密後的位元組資料轉換為新的加密位元組數組

                return Convert.ToBase64String(encryptdata);//将加密後的位元組數組轉換為字元串

            }

        }

        /// <summary> 

        /// 解密 

        /// </summary> 

        /// <param name="decryptString"></param> 

        /// <returns></returns> 

        public static string Decrypt(string decryptString)

        {

            param = new CspParameters();

            param.KeyContainerName = EncryptKey;

            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))

            {

                byte[] encryptdata = Convert.FromBase64String(decryptString);

                byte[] decryptdata = rsa.Decrypt(encryptdata, false);

                return Encoding.Default.GetString(decryptdata);

            }

        }

    }