java 实现des加密！

flm_llx · 发表于 2013-1-26 16:39:26

DES.java

package Lion.Security.Cryptography;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
/**
   * DES加密的，文件中共有两个方法,加密、解密
   * @author Lion
   * @author www.lionsky.net
   */
public class DES {
         private String Algorithm = "DES";
         private KeyGenerator keygen;
         private SecretKey deskey;
         private Cipher c;
         private byte[] cipherByte;

         /**
         * 初始化 DES 实例
         */
         public DES() {
                     init();
         }

         public void init() {
               Security.addProvider(new com.sun.crypto.provider.SunJCE());
               try {
                              keygen = KeyGenerator.getInstance(Algorithm);
                              deskey = keygen.generateKey();
                              c = Cipher.getInstance(Algorithm);
                  }
                  catch(NoSuchAlgorithmException ex){
                        ex.printStackTrace();
               }
                  catch(NoSuchPaddingException ex){
                        ex.printStackTrace();
               }
               }

         /**
         * 对 String 进行加密
         * @param str 要加密的数据
         * @return 返回加密后的 byte 数组
         */
         public byte[] createEncryptor(String str) {
               try {
                           c.init(Cipher.ENCRYPT_MODE, deskey);
                           cipherByte = c.doFinal(str.getBytes());
               }
               catch(java.security.InvalidKeyException ex){
                        ex.printStackTrace();
               }
               catch(javax.crypto.BadPaddingException ex){
                        ex.printStackTrace();
               }
               catch(javax.crypto.IllegalBlockSizeException ex){
                        ex.printStackTrace();
               }
               return cipherByte;
         }

         /**
         * 对 Byte 数组进行解密
         * @param buff 要解密的数据
         * @return 返回加密后的 String
         */
         public String createDecryptor(byte[] buff) {
               try {
                     c.init(Cipher.DECRYPT_MODE, deskey);
                     cipherByte = c.doFinal(buff);
               }
               catch(java.security.InvalidKeyException ex){
                        ex.printStackTrace();
               }
               catch(javax.crypto.BadPaddingException ex){
                        ex.printStackTrace();
               }
               catch(javax.crypto.IllegalBlockSizeException ex){
                        ex.printStackTrace();
               }
               return (new String(cipherByte));
         }
}



DES.jsp

<%@ page c %>
<jsp:useBean id="DES" scope="page" class="Lion.Security.Cryptography.DES" />
<html>
<head><title>DES File</title></head>

<body bgcolor="#FFFFFF">
<div align="center"><center>
<%
String Test = request.getParameter("Test");
if(Test==null || Test.equals("")) {
%>
         <form name="form" method="post">
         <input type="text" name="Test" size="25" value=""/>
         <input type="submit" name="button" value=" 确定 "/>
         </form>
         <%
}else{
                        out.println("加密前的数据："+Test +"<br/>");
                        out.println("加密后的数据："+DES.createEncryptor(Test) +"<br/>");
                        out.println("解密后的数据："+DES.createDecryptor(DES.createEncryptor(Test)) +"<br/>");
            }
         %>
</center></div>
</body>
</html>

  Top
6 楼laughsmile（海边的星空）回复于 2005-06-08 21:09:56 得分 60
import javax.crypto.*;
import java.io.*;
import javax.crypto.spec.*;
import java.security.spec.*;

public class DesEncrypter {
               Cipher ecipher;
               Cipher dcipher;

               // 8-byte Salt
               byte[] salt = {
                        (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
                        (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
               };

               // Iteration count
               int iterationCount = 19;

               DesEncrypter(String passPhrase) {
                        try {
                                 // Create the key
                                 KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
                                 SecretKey key = SecretKeyFactory.getInstance(
                                       "PBEWithMD5AndDES").generateSecret(keySpec);
                                 ecipher = Cipher.getInstance(key.getAlgorithm());
                                 dcipher = Cipher.getInstance(key.getAlgorithm());

                                 // Prepare the parameter to the ciphers
                                 AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

                                 // Create the ciphers
                                 ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
                                 dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
                        } catch (java.security.InvalidAlgorithmParameterException e) {
                        } catch (java.security.spec.InvalidKeySpecException e) {
                        } catch (javax.crypto.NoSuchPaddingException e) {
                        } catch (java.security.NoSuchAlgorithmException e) {
                        } catch (java.security.InvalidKeyException e) {
                        }
               }

               public String encrypt(String str) {
                        try {
                                 // Encode the string into bytes using utf-8
                                 byte[] utf8 = str.getBytes("UTF8");

                                 // Encrypt
                                 byte[] enc = ecipher.doFinal(utf8);

                                 // Encode bytes to base64 to get a string
                                 return new sun.misc.BASE64Encoder().encode(enc);
                        } catch (javax.crypto.BadPaddingException e) {
                        } catch (IllegalBlockSizeException e) {
                        } catch (UnsupportedEncodingException e) {
                        } catch (java.io.IOException e) {
                        }
                        return null;
               }

               public String decrypt(String str) {
                        try {
                                 // Decode base64 to get bytes
                                 byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);

                                 // Decrypt
                                 byte[] utf8 = dcipher.doFinal(dec);

                                 // Decode using utf-8
                                 return new String(utf8, "UTF8");
                        } catch (javax.crypto.BadPaddingException e) {
                        } catch (IllegalBlockSizeException e) {
                        } catch (UnsupportedEncodingException e) {
                        } catch (java.io.IOException e) {
                        }
                        return null;
               }

         // Here is an example that uses the class

public static void main(String s[])
{
try {
               // Create encrypter/decrypter class
               DesEncrypter encrypter = new DesEncrypter("crypto");

               // Encrypt
               String encrypted = encrypter.encrypt("11");
System.out.println(encrypted);
               // Decrypt
               String decrypted = encrypter.decrypt(encrypted);
System.out.println(decrypted);
         } catch (Exception e) {e.printStackTrace(); }

}
}

		自动登录	找回密码
密码			立即注册

java 实现des加密！

浏览过的版块