DES与MD5加密

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Security.Cryptography;
using System.Text;
using System.IO;
using System.Windows.Forms;


/// <summary>
/// DesEncrypt 的摘要说明
/// </summary>
public class DesMd5
{
     public DesMd5()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}
    




     /// <summary>
     /// Encrypt the string
     /// Attention:key must be 8 bits
     /// </summary>
     /// <param name="strText">string</param>
     /// <param name="strEncrKey">key</param>
     /// <returns></returns>
     public string DesEncrypt(string strText, string strEncrKey)
     {
         byte[] byKey = null;
         byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
         try
         {
             byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
             byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
             MemoryStream ms = new MemoryStream();
             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
             cs.Write(inputByteArray, 0, inputByteArray.Length);
             cs.FlushFinalBlock();
             return Convert.ToBase64String(ms.ToArray());

         }
         catch (System.Exception error)
         {
            // MessageBox.Show(error.Message);
             return "error:" + error.Message + "\r";
         }
     }
     /// <summary>
     /// Decrypt string
     /// Attention:key must be 8 bits
     /// </summary>
     /// <param name="strText">Decrypt string</param>
     /// <param name="sDecrKey">key</param>
     /// <returns>output string</returns>
     public string DesDecrypt(string strText, string sDecrKey)
     {
         byte[] byKey = null;
         byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
         byte[] inputByteArray = new Byte[strText.Length];
         try
         {
             byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
             inputByteArray = Convert.FromBase64String(strText);
             MemoryStream ms = new MemoryStream();
             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
             cs.Write(inputByteArray, 0, inputByteArray.Length);
             cs.FlushFinalBlock();
             System.Text.Encoding encoding = new System.Text.UTF8Encoding();
             return encoding.GetString(ms.ToArray());
         }
         catch (System.Exception error)
         {
            // MessageBox.Show(error.Message);
             return "error:" + error.Message + "\r";
         }
     }
     /// <summary>
     /// Encrypt files
     /// Attention:key must be 8 bits
     /// </summary>
     /// <param name="m_InFilePath">Encrypt file path</param>
     /// <param name="m_OutFilePath">output file</param>
     /// <param name="strEncrKey">key</param>
     public void DesEncryptFile(string m_InFilePath, string m_OutFilePath, string strEncrKey)
     {
         byte[] byKey = null;
         byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
         try
         {
             byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
             FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
             FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
             fout.SetLength(0);
             //Create variables to help with read and write.
             byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
             long rdlen = 0;               //This is the total number of bytes written.
             long totlen = fin.Length;     //This is the total length of the input file.
             int len;                      //This is the number of bytes to be written at a time.
             DES des = new DESCryptoServiceProvider();
             CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);

             //Read from the input file, then encrypt and write to the output file.
             while (rdlen < totlen)
             {
                 len = fin.Read(bin, 0, 100);
                 encStream.Write(bin, 0, len);
                 rdlen = rdlen + len;
             }
             encStream.Close();
             fout.Close();
             fin.Close();


         }
         catch (System.Exception error)
         {
             MessageBox.Show(error.Message, "错误信息");
            // MessageBox.Show(error.Message.ToString());
         }
     }
     /// <summary>
     /// Decrypt files
     /// Attention:key must be 8 bits
     /// </summary>
     /// <param name="m_InFilePath">Decrypt filepath</param>
     /// <param name="m_OutFilePath">output filepath</param>
     /// <param name="sDecrKey">key</param>
     public void DesDecryptFile(string m_InFilePath, string m_OutFilePath, string sDecrKey)
     {
         byte[] byKey = null;
         byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
         try
         {
             byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
             FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
             FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
             fout.SetLength(0);
             //Create variables to help with read and write.
             byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
             long rdlen = 0;               //This is the total number of bytes written.
             long totlen = fin.Length;     //This is the total length of the input file.
             int len;                      //This is the number of bytes to be written at a time.
             DES des = new DESCryptoServiceProvider();
             CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

             //Read from the input file, then encrypt and write to the output file.
             while (rdlen < totlen)
             {
                 len = fin.Read(bin, 0, 100);
                 encStream.Write(bin, 0, len);
                 rdlen = rdlen + len;
             }
             encStream.Close();
             fout.Close();
             fin.Close();
         }
         catch (System.Exception error)
         {
             MessageBox.Show(error.Message, "错误信息");
             //MessageBox.Show("error:" + error.Message);
         }
     }
    
     ///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());
     }

     //哈希加密
     public string HashEncrypt(string plain)
     {
         byte[] buffer = System.Text.Encoding.UTF8.GetBytes(plain);
         System.Security.Cryptography.SHA1CryptoServiceProvider sha =
             new System.Security.Cryptography.SHA1CryptoServiceProvider();
         byte[] hash = sha.ComputeHash(buffer);
         System.Text.StringBuilder passwordBuilder = new System.Text.StringBuilder(32);
         foreach (byte hashByte in hash)
         {
             passwordBuilder.Append(hashByte.ToString("x2"));
         }
         return passwordBuilder.ToString();
     }

}