C#DES暗号化・復号クラスの作成

9191 ワード

このC#クラスパッケージのDES暗号解読は、デフォルトの鍵を使って暗号化、復号化することもできるし、鍵をカスタマイズして暗号化、復号化することもでき、呼び出しが簡単で便利です.
例1:

using System;
using System.Security.Cryptography; 
using System.Text;
namespace DotNet.Utilities
{
  /// 
  /// DES  /   。
  /// 
  public class DESEncrypt
  {
    public DESEncrypt()
    {     
    }
 
    #region ========  ========
 
    /// 
    ///   
    /// 
    /// 
    /// 
    public static string Encrypt(string Text)
    {
      return Encrypt(Text,"sharejs.com");
    }
    /// 
    ///     
    /// 
    /// 
    /// 
    /// 
    public static string Encrypt(string Text,string sKey)
    {
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
      byte[] inputByteArray;
      inputByteArray=Encoding.Default.GetBytes(Text);
      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      System.IO.MemoryStream ms=new System.IO.MemoryStream();
      CryptoStream cs=new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write);
      cs.Write(inputByteArray,0,inputByteArray.Length);
      cs.FlushFinalBlock();
      StringBuilder ret=new StringBuilder();
      foreach( byte b in ms.ToArray())
      {
        ret.AppendFormat("{0:X2}",b);
      }
      return ret.ToString();
    }
 
    #endregion
     
    #region ========  ========
  
 
    /// 
    ///   
    /// 
    /// 
    /// 
    public static string Decrypt(string Text)
    {
      return Decrypt(Text,"sharejs.com");
    }
    /// 
    ///     
    /// 
    /// 
    /// 
    /// 
    public static string Decrypt(string Text,string sKey)
    {
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
      int len;
      len=Text.Length/2;
      byte[] inputByteArray = new byte[len];
      int x,i;
      for(x=0;x 
 

例2: /// public class Help_Encrypt { /// /// /// /// public static string Encode(string str, string key) { try { DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8)); provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8)); byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str); MemoryStream stream = new MemoryStream(); CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write); stream2.Write(bytes, 0, bytes.Length); stream2.FlushFinalBlock(); StringBuilder builder = new StringBuilder(); foreach (byte num in stream.ToArray()) { builder.AppendFormat("{0:X2}", num); } stream.Close(); return builder.ToString(); } catch (Exception) { return "xxxx"; } } /// /// /// /// public static string Decode(string str, string key) { try { DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8)); provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8)); byte[] buffer = new byte[str.Length / 2]; for (int i = 0; i < (str.Length / 2); i++) { int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10); buffer[i] = (byte)num2; } MemoryStream stream = new MemoryStream(); CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write); stream2.Write(buffer, 0, buffer.Length); stream2.FlushFinalBlock(); stream.Close(); return Encoding.GetEncoding("GB2312").GetString(stream.ToArray()); } catch (Exception) { return ""; } } } JAVADES package com.bgxt.messages; import java.io.UnsupportedEncodingException; import java.security.*; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; /** * * @author Liudong */ public class StringUtils { private static final String PASSWORD_CRYPT_KEY = XmlUtil.getConfig().getPasswdKey().substring(0,8); //private final static String DES = "DES"; //private static final byte[] desKey; // public static String decrypt(String message,String key) throws Exception { byte[] bytesrc =convertHexString(message); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = keyFactory.generateSecret(desKeySpec); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); cipher.init(Cipher.DECRYPT_MODE, secretKey, iv); byte[] retByte = cipher.doFinal(bytesrc); return new String(retByte); } public static byte[] encrypt(String message, String key) throws Exception { Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = keyFactory.generateSecret(desKeySpec); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv); return cipher.doFinal(message.getBytes("UTF-8")); } public static String encrypt(String value){ String result=""; try{ value=java.net.URLEncoder.encode(value, "utf-8"); result=toHexString(encrypt(value, PASSWORD_CRYPT_KEY)).toUpperCase(); }catch(Exception ex){ ex.printStackTrace(); return ""; } return result; } public static byte[] convertHexString(String ss) { byte digest[] = new byte[ss.length() / 2]; for(int i = 0; i < digest.length; i++) { String byteString = ss.substring(2 * i, 2 * i + 2); int byteValue = Integer.parseInt(byteString, 16); digest[i] = (byte)byteValue; } return digest; } public static String toHexString(byte b[]) { StringBuffer hexString = new StringBuffer(); for (int i = 0; i < b.length; i++) { String plainText = Integer.toHexString(0xff & b[i]); if (plainText.length() < 2) plainText = "0" + plainText; hexString.append(plainText); } return hexString.toString(); } public static void main(String[] args) throws Exception { String value="01"; System.out.println(" :"+value); System.out.println(" :"+XmlUtil.getConfig().getPasswdKey()); String a=encrypt( value); System.out.println(" :"+a); } }
以上が本文のすべてですが、お好きになってください.