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使用Des,MD5 加密.解密.字符串.文件 (转)

原创 IT综合 作者:amyz 时间:2007-11-13 14:55:25 0 删除 编辑
使用Des,MD5 加密.解密.字符串.文件 (转)[@more@]

/*
 使用Des,MD5对字符串,数据文件加密.

//加密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)
public  string DesEncrypt(string strText, string strEncrKey)

//解密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)

public string  DesDecrypt(string strText,string sDecrKey)

//加密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)

public void DesEncrypt(string m_InFilePath,string m_OutFilePath,string strEncrKey)

//解密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)

public void DesDecrypt(string m_InFilePath,string m_OutFilePath,string sDecrKey)

//MD5加密

public string MD5Encrypt(string strText)

*/

 


/******************************************************************************************
 *  Cryptography class is for Cryptography
  author:Jim
  e_Mail:tjq_tang@hotmail.com 
 *  thanks:
 *  URI:
 *
 *
 *****************************************************************************************/
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
using System.windows.Forms ;

namespace.NETbee.Classes.Security
{
 ///


 ///Cryptography
 ///

 public class Cryptography
 {
 public Cryptography()
 {
 
 }
 ///
 /// Encrypt the string
 /// Attention:key must be 8 bits
 ///

 /// string
 /// key
 ///
 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";
 }
 }
 ///


 /// Decrypt string
 /// Attention:key must be 8 bits
 ///

 /// Decrypt string
 /// key
 /// output string
 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";
 }
 }
 ///
 /// Encrypt files
 /// Attention:key must be 8 bits
 ///

 /// Encrypt file path
 /// output file
 /// key
 public void DesEncrypt(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.ToString());
 
 }
 }
 ///


 /// Decrypt files
 /// Attention:key must be 8 bits
 ///

 /// Decrypt filepath
 /// output filepath
 /// key
 public void DesDecrypt(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:"+error.Message);
 }
 }
 ///


 /// MD5 Encrypt
 ///

 /// text
 /// md5 Encrypt string
 public string MD5Encrypt(string strText)
 {
 MD5 md5 = new MD5CryptoServiceProvider();
 byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strText)); 
 return System.Text.Encoding.Default.GetString(result);
 }
 }
}


来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10752019/viewspace-982259/,如需转载,请注明出处,否则将追究法律责任。

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