DES/3DES加密算法源代码-转载
网上看到 一个这样加密的程序,也许以后能用到,故摘录下来.网址:http://www.1cn.biz/index.php?q=node/89使用方法：
encryptedTextXXXDES.getInstance().encrypt("your plain text");
plainText=XXXDES.getInstance().decrypt("your encrypted text");
代码：
package com.xxxxx.utils;import java.io.FileInputStream;import java.io.ObjectInputStream;import java.security.NoSuchAlgorithmException;import java.security.Security;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;public class DES { private String Algorithm = "DESede"; //"DESede" for Triple DES private KeyGenerator keygen; private SecretKey deskey; private Cipher c; private byte[] cipherByte; public DES() {init(); } public DES(String filename) {init(filename); } public SecretKey genKey() {try { keygen = KeyGenerator.getInstance(Algorithm); deskey = keygen.generateKey(); //利用JavaBean的持久化将key保存为文件XXX.key} catch (NoSuchAlgorithmException ex) { ex.printStackTrace();} catch (Exception ex) { ex.printStackTrace();}return deskey; } /*** * @param filename*/ public void init(String filename) {//restore keySecurity.addProvider(new com.sun.crypto.provider.SunJCE());try { FileInputStream fis = new FileInputStream(filename); fis = new FileInputStream(filename); ObjectInputStream ois = new ObjectInputStream(fis); deskey = (SecretKey) ois.readObject(); ois.close(); fis.close(); c = Cipher.getInstance(Algorithm);} catch (NoSuchAlgorithmException ex) { ex.printStackTrace();} catch (NoSuchPaddingException ex) { ex.printStackTrace();} catch (Exception ex) { ex.printStackTrace();} } 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();} } public byte[] encryptor(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();} catch (Exception ex) { ex.printStackTrace();}return cipherByte; } public String decryptor(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();} catch (Exception ex) { ex.printStackTrace();}return (new String(cipherByte)); }}/* * Project xxxx * Package com.xxxx.utils * Created on 2003-11-24 * Author Derys * */package com.xxxx.utils;/** ** */public class XXXDES { private static XXXDES instance = new XXXDES(); public XXXDES() { } /*** * @param str* @return*/ public String encrypt(String str) {StringBuffer buffer = new StringBuffer();DES des = new DES("XXX.key");byte[] en = des.encryptor(str);for (int i = 0; i < en.length; i++) { buffer.append((char) en);}return buffer.toString(); } /*** * @param str* @return*/ public String decrypt(String str) {DES des = new DES("XXX.key");byte[] en = new byte;for (int i = 0; i < str.length(); i++) { en = (byte) str.charAt(i);}String de = des.decryptor(en);return de; } /*** * @param str* @return*/ public String replaceChar(String str) { StringBuffer buffer = new StringBuffer(); int index = str.indexOf("'"); if (index == -1) { return str; } while (index > -1) { buffer.append(str.substring(0, index)); buffer.append("''"); str = str.substring(index + 1); index = str.indexOf("'"); } buffer.append(str); return buffer.toString();} /*** * @return*/ public static XXXDES getInstance(){if(instance == null){ instance = new XXXDES();}return instance; }}
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