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/*
 *  Copyright 2008 biaoping.yin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.frameworkset.common.poolman.security;

import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;

/**
 * 
 * 

Title: DESCipher.java

* *

Description: 一个采用DES算法的加密解密类,可以通过设置密钥或使用默认密钥,对字符串和字节数组进行加密和解密运算。

* *

Copyright: Copyright (c) 2007

* @Date 2012-3-14 下午3:23:03 * @author biaoping.yin * @version 1.0 */ public class DESCipher { private static final String DEFAULTKEY = "BBOSSGRP"; private Cipher encryptCipher = null; private Cipher decryptCipher = null; /** * 将参数字节数组转换为16进制值表示组合而成的字符串。 * * @param byte[] 需要转换的byte数组 * @return String 转换后的字符串 * @throws Exception * JAVA异常 */ public static String byteGrpToHexStr(byte[] arrB) throws Exception { int iLen = arrB.length; StringBuilder tempSB = new StringBuilder(iLen * 2); for (int i = 0; i < iLen; i++) { int intTmp = arrB[i]; while (intTmp < 0) { intTmp = intTmp + 256; } if (intTmp < 16) { tempSB.append("0"); } tempSB.append(Integer.toString(intTmp, 16)); } return tempSB.toString(); } /** * 将参数16进制值表示组合而成的字符串转换为字节数组。 * * @param String * 需要转换的字符串 * @return byte[] 转换后的byte数组 * @throws Exception * JAVA异常 */ public static byte[] hexStrToByteGrp(String strIn) throws Exception { byte[] arrB = strIn.getBytes(); int iLen = arrB.length; byte[] arrOut = new byte[iLen / 2]; for (int i = 0; i < iLen; i = i + 2) { String strTmp = new String(arrB, i, 2); arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16); } return arrOut; } /** * 默认构造方法,使用默认密钥 * * @throws Exception */ public DESCipher() throws Exception { this(DEFAULTKEY); } /** * 指定密钥构造方法 * * @param String * 指定的密钥 * @throws Exception * JAVA异常 */ public DESCipher(String strKey) throws Exception { Security.addProvider(new com.sun.crypto.provider.SunJCE()); Key key = getKey(strKey.getBytes()); encryptCipher = Cipher.getInstance("DES"); encryptCipher.init(Cipher.ENCRYPT_MODE, key); decryptCipher = Cipher.getInstance("DES"); decryptCipher.init(Cipher.DECRYPT_MODE, key); } /** * 加密字节数组 * * @param byte[] 需加密的字节数组 * @return byte[] 加密后的字节数组 * @throws Exception * JAVA异常 */ public byte[] encrypt(byte[] arrB) throws Exception { return encryptCipher.doFinal(arrB); } /** * 加密字符串 * 将字符串转换为字节数组后重用encrypt(byte[])方法进行加密,并将得到字节数组转换为字符串返回 * * @param String * 需加密的字符串 * @return String 加密后的字符串 * @throws Exception * JAVA异常 */ public String encrypt(String strIn) throws Exception { return byteGrpToHexStr(encrypt(strIn.getBytes())); } /** * 解密字节数组 * * @param byte[] 需解密的字节数组 * @return byte[] 解密后的字节数组 * @throws Exception * JAVA异常 */ public byte[] decrypt(byte[] arrB) throws Exception { return decryptCipher.doFinal(arrB); } /** * 解密字符串 * 将参数字符串转换为字节数组后重用decrypt(String)方法进行解密,并将得到的解密字符数组转换为字符串后返回。 * * @param String * 需解密的字符串 * @return String 解密后的字符串 * @throws Exception * JAVA异常 */ public String decrypt(String strIn) throws Exception { return new String(decrypt(hexStrToByteGrp(strIn))); } /** * 从指定字符串生成密钥,密钥所需的字节数组长度为8位 不足8位时后面补0,超出8位只取前8位 * * @param byte[] 构成该字符串的字节数组 * @return Key 生成的密钥 * @throws Exception * JAVA异常 */ private Key getKey(byte[] arrBTmp) throws Exception { byte[] arrB = new byte[8]; for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) { arrB[i] = arrBTmp[i]; } Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES"); return key; } public static void main(String[] args){ System.out.println(DEFAULTKEY.getBytes().length); } }




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