C#常用数据加密类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Cryptography
{
    public static class EncryptComputer
    {


        #region DES加密速度較快，適用於加密大量數據的場合
        /// <summary>
        /// DES加密速度較快，適用於加密大量數據的場合
        /// </summary>
        /// <param name="EncryptString">待加密的密文</param>
        /// <param name="EncryptKey">加密的密鑰</param>
        /// <returns>returns</returns>

        public static string DESEncrypt(string EncryptString, string EncryptKey)
        {

            if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }



            if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }



            if (EncryptKey.Length != 8) { throw (new Exception("密钥必须为8位")); }



            byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



            string m_strEncrypt = "";



            DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();



            try
            {

                byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);



                m_cstream.Write(m_btEncryptString, 0, m_btEncryptString.Length);



                m_cstream.FlushFinalBlock();



                m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_cstream.Close(); m_cstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_DESProvider.Clear(); }



            return m_strEncrypt;

        } 
        #endregion

        #region DES 解密(数据加密标准，速度较快，适用于加密大量数据的场合)
        /// <summary>

        /// DES 解密(加密速度較快，適用於加密大量數據的場合)

        /// </summary>

        /// <param name="DecryptString">待解密的密文</param>

        /// <param name="DecryptKey">解密的密鑰</param>

        /// <returns>returns</returns>

        public static string DESDecrypt(string DecryptString, string DecryptKey)
        {

            if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密鑰不得為空")); }



            if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密鑰不得為空")); }



            if (DecryptKey.Length != 8) { throw (new Exception("密鑰必須為8位")); }



            byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



            string m_strDecrypt = "";



            DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();



            try
            {

                byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);



                m_cstream.Write(m_btDecryptString, 0, m_btDecryptString.Length);



                m_cstream.FlushFinalBlock();



                m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_cstream.Close(); m_cstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_DESProvider.Clear(); }



            return m_strDecrypt;

        } 
        #endregion

        #region RC2 加密(用变长密钥对大量数据进行加密)
        /// <summary>

        /// RC2 加密(用变长密钥对大量数据进行加密)

        /// </summary>

        /// <param name="EncryptString">待加密密文</param>

        /// <param name="EncryptKey">加密密钥</param>

        /// <returns>returns</returns>

        public static string RC2Encrypt(string EncryptString, string EncryptKey)
        {

            if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }



            if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }



            if (EncryptKey.Length < 5 || EncryptKey.Length > 16) { throw (new Exception("密钥必须为5-16位")); }



            string m_strEncrypt = "";



            byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



            RC2CryptoServiceProvider m_RC2Provider = new RC2CryptoServiceProvider();



            try
            {

                byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_cstream = new CryptoStream(m_stream, m_RC2Provider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);



                m_cstream.Write(m_btEncryptString, 0, m_btEncryptString.Length);



                m_cstream.FlushFinalBlock();



                m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_cstream.Close(); m_cstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_RC2Provider.Clear(); }



            return m_strEncrypt;

        } 
        #endregion

        #region RC2 解密(用变长密钥对大量数据进行加密)
        /// <summary>

        /// RC2 解密(用变长密钥对大量数据进行加密)

        /// </summary>

        /// <param name="DecryptString">待解密密文</param>

        /// <param name="DecryptKey">解密密钥</param>

        /// <returns>returns</returns>

        public static string RC2Decrypt(string DecryptString, string DecryptKey)
        {

            if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密文不得为空")); }



            if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }



            if (DecryptKey.Length < 5 || DecryptKey.Length > 16) { throw (new Exception("密钥必须为5-16位")); }



            byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



            string m_strDecrypt = "";



            RC2CryptoServiceProvider m_RC2Provider = new RC2CryptoServiceProvider();



            try
            {

                byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_cstream = new CryptoStream(m_stream, m_RC2Provider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);



                m_cstream.Write(m_btDecryptString, 0, m_btDecryptString.Length);



                m_cstream.FlushFinalBlock();



                m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_cstream.Close(); m_cstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_RC2Provider.Clear(); }

            return m_strDecrypt;

        } 
        #endregion

        #region 3DES加密基於DES，對一塊數據用三個不同的秘鑰進行三次加密，強度更高些
        /// <summary>

        /// 3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些

        /// </summary>

        /// <param name="EncryptString">待加密密文</param>

        /// <param name="EncryptKey1">密鑰一</param>

        /// <param name="EncryptKey2">密鑰二</param>

        /// <param name="EncryptKey3">密鑰三</param>

        /// <returns>returns</returns>

        public static string DES3Encrypt(string EncryptString, string EncryptKey1, string EncryptKey2, string EncryptKey3)
        {

            string m_strEncrypt = "";



            try
            {

                m_strEncrypt = DESEncrypt(EncryptString, EncryptKey3);



                m_strEncrypt = DESEncrypt(m_strEncrypt, EncryptKey2);



                m_strEncrypt = DESEncrypt(m_strEncrypt, EncryptKey1);

            }

            catch (Exception ex) { throw ex; }



            return m_strEncrypt;

        } 
        #endregion

        #region 3DES 解密(3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些)
        /// <summary>

        /// 3DES 解密(3DES加密基於DES，對一塊數據用三個不同的密鑰進行三次加密，強度更高些)

        /// </summary>

        /// <param name="DecryptString">待解密密文</param>

        /// <param name="DecryptKey1">密钥一</param>

        /// <param name="DecryptKey2">密钥二</param>

        /// <param name="DecryptKey3">密钥三</param>

        /// <returns>returns</returns>

        public static string DES3Decrypt(string DecryptString, string DecryptKey1, string DecryptKey2, string DecryptKey3)
        {

            string m_strDecrypt = "";



            try
            {

                m_strDecrypt = DESDecrypt(DecryptString, DecryptKey1);



                m_strDecrypt = DESDecrypt(m_strDecrypt, DecryptKey2);



                m_strDecrypt = DESDecrypt(m_strDecrypt, DecryptKey3);

            }

            catch (Exception ex) { throw ex; }



            return m_strDecrypt;

        } 
        #endregion

        #region AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高
        /// <summary>

        /// AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高

        /// </summary>

        /// <param name="EncryptString">待加密密文</param>

        /// <param name="EncryptKey">加密密鑰</param>

        /// <returns></returns>

        public static string AESEncrypt(string EncryptString, string EncryptKey)
        {

            if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }



            if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }



            string m_strEncrypt = "";



            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");



            Rijndael m_AESProvider = Rijndael.Create();



            try
            {

                byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_csstream = new CryptoStream(m_stream, m_AESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);



                m_csstream.Write(m_btEncryptString, 0, m_btEncryptString.Length); m_csstream.FlushFinalBlock();



                m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_csstream.Close(); m_csstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_AESProvider.Clear(); }



            return m_strEncrypt;

        } 
        #endregion

        #region AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高
        /// <summary>

        /// AES 加密為高級加密標準，是下一代加密算法的標準，速度快，安全級別高

        /// </summary>

        /// <param name="DecryptString">待解密密文</param>

        /// <param name="DecryptKey">解密密鑰</param>

        /// <returns></returns>

        public static string AESDecrypt(string DecryptString, string DecryptKey)
        {

            if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密文不得为空")); }



            if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }



            string m_strDecrypt = "";



            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");



            Rijndael m_AESProvider = Rijndael.Create();



            try
            {

                byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);



                MemoryStream m_stream = new MemoryStream();



                CryptoStream m_csstream = new CryptoStream(m_stream, m_AESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);



                m_csstream.Write(m_btDecryptString, 0, m_btDecryptString.Length); m_csstream.FlushFinalBlock();



                m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());



                m_stream.Close(); m_stream.Dispose();



                m_csstream.Close(); m_csstream.Dispose();

            }

            catch (IOException ex) { throw ex; }

            catch (CryptographicException ex) { throw ex; }

            catch (ArgumentException ex) { throw ex; }

            catch (Exception ex) { throw ex; }

            finally { m_AESProvider.Clear(); }



            return m_strDecrypt;

        } 
        #endregion

    }
}