C# · 12月 28, 2021

C#编写DES加密、解密类

这个C#类封装的DES加密解密,可以使用默认秘钥进行加密、解密,也可以自定义秘钥进行加密、解密,调用简单方便。

示例一:

using System;using System.Security.Cryptography; using System.Text;namespace DotNet.Utilities{ /// <summary> /// DES加密/解密类。 /// </summary> public class DESEncrypt { public DESEncrypt() { } #region ========加密======== /// <summary> /// 加密 /// </summary> /// <param name=”Text”></param> /// <returns></returns> public static string Encrypt(string Text) { return Encrypt(Text,”sharejs.com”); } /// <summary> /// 加密数据 /// </summary> /// <param name=”Text”></param> /// <param name=”sKey”></param> /// <returns></returns> 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,8)); System.IO.MemoryStream ms=new System.IO.MemoryStream(); CryptoStream cs=new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write); cs.Write(inputByteArray,inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret=new StringBuilder(); foreach( byte b in ms.ToArray()) { ret.AppendFormat(“{0:X2}”,b); } return ret.ToString(); } #endregion #region ========解密======== /// <summary> /// 解密 /// </summary> /// <param name=”Text”></param> /// <returns></returns> public static string Decrypt(string Text) { return Decrypt(Text,”sharejs.com”); } /// <summary> /// 解密数据 /// </summary> /// <param name=”Text”></param> /// <param name=”sKey”></param> /// <returns></returns> 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<len;x++) { i = Convert.ToInt32(Text.Substring(x * 2,2),16); inputByteArray[x]=(byte)i; } des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey,des.CreateDecryptor(),inputByteArray.Length); cs.FlushFinalBlock(); return Encoding.Default.GetString(ms.ToArray()); } #endregion }}

示例二:

///<summary><![CDATA[加密解密帮助类]]></summary> public class Help_Encrypt { ///<summary><![CDATA[字符串DES加密函数]]></summary> ///<param name=”str”><![CDATA[被加密字符串 ]]></param> ///<param name=”key”><![CDATA[密钥 ]]></param> ///<returns><![CDATA[加密后字符串]]></returns> 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,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”; } } ///<summary><![CDATA[字符串DES解密函数]]></summary> ///<param name=”str”><![CDATA[被解密字符串 ]]></param> ///<param name=”key”><![CDATA[密钥 ]]></param> ///<returns><![CDATA[解密后字符串]]></returns> public static string Decode(string str,8)); byte[] buffer = new byte[str.Length / 2]; for (int i = 0; i < (str.Length / 2); i++) { int num2 = Convert.ToInt32(str.Substring(i * 2,0×10); buffer[i] = (byte)num2; } MemoryStream stream = new MemoryStream(); CryptoStream stream2 = new CryptoStream(stream,provider.CreateDecryptor(),CryptoStreamMode.Write); stream2.Write(buffer,buffer.Length); stream2.FlushFinalBlock(); stream.Close(); return Encoding.GetEncoding(“GB2312”).GetString(stream.ToArray()); } catch (Exception) { return “”; } } } JAVADES加密解密类 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; /** * 字符串工具集合 * @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; //解密数据 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,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(“加密数据:”+value); System.out.println(“密码为:”+XmlUtil.getConfig().getpasswdKey()); String a=encrypt( value); System.out.println(“加密后的数据为:”+a); } }

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