C#各种加密算法的研究

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

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

            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">待加密的明文</param>
        /// <param name="EncryptKey">加密的密钥</param>
        /// <returns>加密后的密文</returns>
        public static string DESEncrypt(string EncryptString, string EncryptKey)
        {
            if (string.IsNullOrEmpty(EncryptString))
            {
                throw (new Exception("明文不得为空！"));
            }
            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 (ArgumentException ex)
            {
                throw ex;
            }
            catch (CryptographicException 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>解密后的明文</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 (ArgumentException ex)
            {
                throw ex;
            }
            catch (CryptographicException ex)
            {
                throw ex;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                m_DESProvider.Clear();
            }

            return m_strDecrypt;
        }

        /* /// <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;
         }

        static void Main(string[] args)
        {
            /*Console.WriteLine(MD5Encrypt("test"));
            //Console.WriteLine(MD5Decrypt(MD5Encrypt("test")));*/
            string str = DESEncrypt("test", "helloklk");
            Console.WriteLine(str);
            Console.WriteLine(str.Length);
            Console.WriteLine(DESEncrypt("test", "hellokkk").Length);
            Console.WriteLine(DESDecrypt(str, "helloklk"));
            Console.ReadLine();

       /*     HashAlgorithm hash = HashAlgorithm.Create();
            Console.Write("Hash size:");
            Console.Write(hash.HashSize.ToString() + "bits");
            Console.WriteLine();
            byte[] data = { 200, 34, 12, 14, 210, 199, 172, 77, 88, 99 };
            byte[] hashBytes = hash.ComputeHash(data);
            Console.Write("Hash:" + BitConverter.ToString(hashBytes));
            Console.Read();
            */
        }
    }
}