【C#ソース】DES暗号解読クラス
7122 ワード
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Cryptography;
using System.Collections;
namespace Deking
{
class DesEncryption
{
//
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
/// <summary>
/// DES
/// </summary>
/// <param name="encryptString"> </param>
/// <param name="encryptKey"> , 8 </param>
/// <returns> ， </returns>
public static string EncryptDES(string encryptString, string encryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
}
/// <summary>
/// DES
/// </summary>
/// <param name="decryptString"> </param>
/// <param name="decryptKey"> , 8 , </param>
/// <returns> ， </returns>
public static string DecryptDES(string decryptString, string decryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}
}
public void DesEncrypt(string sInputFilename, string sOutputFilename, string key) //
{
string sKey;
FileStream fsInput = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
FileStream fsEncrypted = new FileStream(sOutputFilename,
FileMode.Create,
FileAccess.Write);
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
if (key.Length >= 8)
sKey = key.Substring(0, 8);
else
{
sKey = key.PadRight(8, '1');
}
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateEncryptor();
CryptoStream cryptostream = new CryptoStream(fsEncrypted,
desencrypt,
CryptoStreamMode.Write);
byte[] bytearrayinput = new byte[fsInput.Length];
fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Close();
fsInput.Close();
fsEncrypted.Close();
System.IO.File.Delete(sInputFilename);
}
public void DesDecrypt(string sInputFilename,
string sOutputFilename,
string key)
{
string sKey;
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
//
// key 8
//
if (key.Length >= 8)
sKey = key.Substring(0, 8);
else
{
sKey = key.PadRight(8, '1');
}
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
//Set initialization vector.
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
FileStream fsread = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
FileStream fswrite = new FileStream(sOutputFilename,
FileMode.Create,
FileAccess.Write);
ICryptoTransform desdecrypt = DES.CreateDecryptor();
CryptoStream cryptostreamDecr = new CryptoStream(fswrite,
desdecrypt,
CryptoStreamMode.Write);
byte[] bytearrayinput = new byte[fsread.Length];
fsread.Read(bytearrayinput, 0, bytearrayinput.Length);
cryptostreamDecr.Write(bytearrayinput, 0, bytearrayinput.Length);
cryptostreamDecr.Close();
fswrite.Close();
fsread.Close();
System.IO.File.Delete(sInputFilename);
}
}
}