C# 超强加密解密类

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

namespace EncryptionDecryption
{
    class EDClass
    {
        /// <summary>
        /// MD5 加密静态方法
        /// </summary>
        /// <param name="EncryptString">待加密的密文</param>
        /// <returns>returns</returns>
        public static string MD5Encrypt(string EncryptString)
        {
            if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }

            MD5 m_ClassMD5 = new MD5CryptoServiceProvider();

            string m_strEncrypt = "";

            try
            {
                m_strEncrypt = BitConverter.ToString(m_ClassMD5.ComputeHash(Encoding.Default.GetBytes(EncryptString))).Replace("-", "");
            }
            catch (ArgumentException ex) { throw ex; }
            catch (CryptographicException ex) { throw ex; }
            catch (Exception ex) { throw ex; }
            finally { m_ClassMD5.Clear(); }

            return m_strEncrypt;
        }
        /// <summary>
        /// DES 加密(数据加密标准，速度较快，适用于加密大量数据的场合)
        /// </summary>
        /// <param name="EncryptString">待加密的密文</param>
        /// <param name="EncryptKey">加密的密钥</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;
        }
        /// <summary>
        /// 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>
        /// <param name="DecryptString">待解密的密文</param>
        /// <param name="DecryptKey">解密的密钥</param>
        /// <returns>returns</returns>
        public static string DESDecrypt(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 != 8) { throw (new Exception("密钥必须为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;
        }
        /// <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;
        }
        /// <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;
        }
        /// <summary>
        /// 3DES 加密(基于DES，对一块数据用三个不同的密钥进行三次加密，强度更高)
        /// </summary>
        /// <param name="EncryptString">待加密密文</param>
        /// <param name="EncryptKey1">密钥一</param>
        /// <param name="EncryptKey2">密钥二</param>
        /// <param name="EncryptKey3">密钥三</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;
        }
        /// <summary>
        /// 3DES 解密(基于DES，对一块数据用三个不同的密钥进行三次加密，强度更高)
        /// </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;
        }
        /// <summary>
        /// AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        /// </summary>
        /// <param name="EncryptString">待加密密文</param>
        /// <param name="EncryptKey">加密密钥</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;
        }
        /// <summary>
        /// AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        /// </summary>
        /// <param name="DecryptString">待解密密文</param>
        /// <param name="DecryptKey">解密密钥</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;
        }

        /// <summary>
        /// <函数：Encode>
        /// 作用：将字符串内容转化为16进制数据编码，其逆过程是Decode
        /// 参数说明：
        /// strEncode 需要转化的原始字符串
        /// 转换的过程是直接把字符转换成Unicode字符,比如数字"3"-->0033,汉字"我"-->U+6211
        /// 函数decode的过程是encode的逆过程.
        /// </summary>
        /// <param name="strEncode"></param>
        /// <returns></returns>
        public static string Encode(string strEncode)
        {
            string strReturn = "";//  存储转换后的编码
            foreach (short shortx in strEncode.ToCharArray())
            {
                strReturn += shortx.ToString("X4");
            }
            return strReturn;
        }
        /// <summary>
        /// <函数：Decode>
        ///作用：将16进制数据编码转化为字符串，是Encode的逆过程
        /// </summary>
        /// <param name="strDecode"></param>
        /// <returns></returns>
        public static string Decode(string strDecode)
        {
            string sResult = "";
            for (int i = 0; i < strDecode.Length / 4; i++)
            {
                sResult += (char)short.Parse(strDecode.Substring(i * 4, 4), global::System.Globalization.NumberStyles.HexNumber);
            }
            return sResult;
        }
    }
}