使用Des,MD5 加密.解密.字符串.文件

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

{

///

public class Cryptography

{

public Cryptography()

{

}

///

/// 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.ToBaseString(ms.ToArray());

}

catch(System.Exception error)

{

MessageBox.Show(error.Message);

return "error:" +error.Message+"\

";

}

}

///

/// 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.FromBaseString(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+"\

";

}

}

///

/// 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 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);

}

}

///

/// 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);

}

}

}