DES(Data Encryption Standard)加密解密整理

來源:互聯網
上載者:User
standard|加密|解密 這個類是我在網上參考了幾個文檔總結出來的,測試過可以直接用,後面有一段MD5的,應該獨立成一個類的,我懶,所以測試的時候就寫到一個檔案裡了,感覺還是滿實用的,如果有什麼機密檔案,就用這個東西處理一下,將來要看的時候再反過來處理一下,只是你不要忘記了密碼就對了,如果你跟我一樣懶,你直接把下面的代碼拷貝下來直接用吧。
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Web;

namespace Test.Com
{
/// <summary>
/// DESEncryptor 的摘要說明。
/// </summary>
public class DESEncryptor
{
#region 私人成員
/// <summary>
/// 輸入字串
/// </summary>
private string inputString=null;
/// <summary>
/// 輸出字串
/// </summary>
private string outString=null;
/// <summary>
/// 輸入檔案路徑
/// </summary>
private string inputFilePath=null;
/// <summary>
/// 輸出檔案路徑
/// </summary>
private string outFilePath=null;
/// <summary>
/// 加密金鑰
/// </summary>
private string encryptKey=null;
/// <summary>
/// 解密密鑰
/// </summary>
private string decryptKey=null;
/// <summary>
/// 提示資訊
/// </summary>
private string noteMessage=null;
#endregion
#region 公用屬性
/// <summary>
/// 輸入字串
/// </summary>
public string InputString
{
get{return inputString;}
set{inputString=value;}
}
/// <summary>
/// 輸出字串
/// </summary>
public string OutString
{
get{return outString;}
set{outString=value;}
}
/// <summary>
/// 輸入檔案路徑
/// </summary>
public string InputFilePath
{
get{return inputFilePath;}
set{inputFilePath=value;}
}
/// <summary>
/// 輸出檔案路徑
/// </summary>
public string OutFilePath
{
get{return outFilePath;}
set{outFilePath=value;}
}
/// <summary>
/// 加密金鑰
/// </summary>
public string EncryptKey
{
get{return encryptKey;}
set{encryptKey=value;}
}
/// <summary>
/// 解密密鑰
/// </summary>
public string DecryptKey
{
get{return decryptKey;}
set{decryptKey=value;}
}
/// <summary>
/// 錯誤資訊
/// </summary>
public string NoteMessage
{
get{return noteMessage;}
set{noteMessage=value;}
}
#endregion
#region 建構函式
public DESEncryptor()
{
//
// TODO: 在此處添加建構函式邏輯
//
}
#endregion
#region DES加密字串
/// <summary>
/// 加密字串
/// 注意:密鑰必須為8位
/// </summary>
/// <param name="strText">字串</param>
/// <param name="encryptKey">密鑰</param>
public void DesEncrypt()
{
byte[] byKey=null;
byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(this.encryptKey.Substring(0,8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.UTF8.GetBytes(this.inputString);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ;
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
this.outString=Convert.ToBase64String(ms.ToArray());
}
catch(System.Exception error)
{
this.noteMessage=error.Message;
}
}
#endregion
#region DES解密字串
/// <summary>
/// 解密字串
/// </summary>
/// <param name="this.inputString">加了密的字串</param>
/// <param name="decryptKey">密鑰</param>
public void DesDecrypt()
{
byte[] byKey = null;
byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
byte[] inputByteArray = new Byte[this.inputString.Length];
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(decryptKey.Substring(0,8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(this.inputString);
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();
this.outString=encoding.GetString(ms.ToArray());
}
catch(System.Exception error)
{
this.noteMessage=error.Message;
}
}
#endregion
#region DES加密檔案
/// <summary>
/// DES加密檔案
/// </summary>
/// <param name="this.inputFilePath">源檔案路徑</param>
/// <param name="this.outFilePath">輸出檔案路徑</param>
/// <param name="encryptKey">密鑰</param>
public void FileDesEncrypt()
{
byte[] byKey=null;
byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(this.encryptKey.Substring(0,8));
FileStream fin = new FileStream(this.inputFilePath, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(this.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)
{
this.noteMessage=error.Message.ToString();

}
}
#endregion
#region DES解密檔案
/// <summary>
/// 解密檔案
/// </summary>
/// <param name="this.inputFilePath">加密了的檔案路徑</param>
/// <param name="this.outFilePath">輸出檔案路徑</param>
/// <param name="decryptKey">密鑰</param>
public void FileDesDecrypt()
{
byte[] byKey = null;
byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(decryptKey.Substring(0,8));
FileStream fin = new FileStream(this.inputFilePath, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(this.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)
{
this.noteMessage=error.Message.ToString();
}
}
#endregion
#region MD5
/// <summary>
/// MD5 Encrypt
/// </summary>
/// <param name="strText">text</param>
/// <returns>md5 Encrypt string</returns>
public void MD5Encrypt()
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(this.inputString));
this.outString=System.Text.Encoding.Default.GetString(result);
}
#endregion

}
}



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