使用Des,MD5 加密.解密.字符串.文件 (转)

最新推荐文章于 2025-02-05 09:01:03 发布

转载最新推荐文章于 2025-02-05 09:01:03 发布 · 122 阅读

本文介绍了一种使用Des和MD5进行字符串及文件加密解密的方法。提供了Des加密和解密字符串、文件的实现代码，并实现了MD5加密算法。代码中详细展示了如何设置密钥、初始化向量以及进行加密解密操作。

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);
}
}
}

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