C# MD5加密与解密

来源：互联网发布：c语言需要什么基础编辑：程序博客网时间：2024/05/01 16:23

using System.Security.Cryptography;
using System.IO;
using System.Text;

///MD5加密
  public string MD5Encrypt(string  pToEncrypt,  string  sKey)
  {
   DESCryptoServiceProvider  des  =  new  DESCryptoServiceProvider();
   byte[]  inputByteArray  =  Encoding.Default.GetBytes(pToEncrypt);
   des.Key  =  ASCIIEncoding.ASCII.GetBytes(sKey);
   des.IV  =  ASCIIEncoding.ASCII.GetBytes(sKey);
   MemoryStream  ms  =  new  MemoryStream();
   CryptoStream  cs  =  new  CryptoStream(ms,  des.CreateEncryptor(),CryptoStreamMode.Write);
   cs.Write(inputByteArray,  0,  inputByteArray.Length);
   cs.FlushFinalBlock();
   StringBuilder  ret  =  new  StringBuilder();
   foreach(byte  b  in  ms.ToArray())
   {
    ret.AppendFormat("{0:X2}",  b);
   }
   ret.ToString();
   return  ret.ToString();

}

  ///MD5解密
  public string MD5Decrypt(string  pToDecrypt,  string  sKey)
  {
   DESCryptoServiceProvider  des  =  new  DESCryptoServiceProvider();

   byte[]  inputByteArray  =  new  byte[pToDecrypt.Length  /  2];
   for(int  x  =  0;  x  <  pToDecrypt.Length  /  2;  x++)
   {
    int  i  =  (Convert.ToInt32(pToDecrypt.Substring(x  *  2,  2),  16));
    inputByteArray[x]  =  (byte)i;
   }

   des.Key  =  ASCIIEncoding.ASCII.GetBytes(sKey);
   des.IV  =  ASCIIEncoding.ASCII.GetBytes(sKey);
   MemoryStream  ms  =  new  MemoryStream();
   CryptoStream  cs  =  new  CryptoStream(ms,  des.CreateDecryptor(),CryptoStreamMode.Write);
   cs.Write(inputByteArray,  0,  inputByteArray.Length);
   cs.FlushFinalBlock();

   StringBuilder  ret  =  new  StringBuilder();

   return  System.Text.Encoding.Default.GetString(ms.ToArray());
  }