Java.DES算法

package com.orifound.security; import java.security.*; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; /** * 字符串工具集合 * * @author LIMING */ public class DESClass { private static final String PASSWORD_CRYPT_KEY = "ORIFOUND"; private final static String DES = "DES"; /** * 加密 * * @param src * 数据源 * @param key * 密钥，长度必须是8的倍数 * @return 返回加密后的数据 * @throws Exception */ public static byte[] encrypt(byte[] src, byte[] key) throws Exception { // DES算法要求有一个可信任的随机数源 SecureRandom sr = new SecureRandom(); // 从原始密匙数据创建DESKeySpec对象 DESKeySpec dks = new DESKeySpec(key); // 创建一个密匙工厂，然后用它把DESKeySpec转换成 // 一个SecretKey对象 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES); SecretKey securekey = keyFactory.generateSecret(dks); // Cipher对象实际完成加密操作 Cipher cipher = Cipher.getInstance(DES); // 用密匙初始化Cipher对象 cipher.init(Cipher.ENCRYPT_MODE, securekey, sr); // 现在，获取数据并加密 // 正式执行加密操作 return cipher.doFinal(src); } /** * 解密 * * @param src * 数据源 * @param key * 密钥，长度必须是8的倍数 * @return 返回解密后的原始数据 * @throws Exception */ public static byte[] decrypt(byte[] src, byte[] key) throws Exception { // DES算法要求有一个可信任的随机数源 SecureRandom sr = new SecureRandom(); // 从原始密匙数据创建一个DESKeySpec对象 DESKeySpec dks = new DESKeySpec(key); // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成 // 一个SecretKey对象 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES); SecretKey securekey = keyFactory.generateSecret(dks); // Cipher对象实际完成解密操作 Cipher cipher = Cipher.getInstance(DES); // 用密匙初始化Cipher对象 cipher.init(Cipher.DECRYPT_MODE, securekey, sr); // 现在，获取数据并解密 // 正式执行解密操作 return cipher.doFinal(src); } /** * 密码解密 * * @param data * @return * @throws Exception */ public final static String decrypt(String data) { try { byte[] dd=decrypt(hex2byte(data.getBytes("Unicode")), PASSWORD_CRYPT_KEY.getBytes()); return new String(dd); } catch (Exception e) { } return null; } /** * 密码加密 * * @param password * @return * @throws Exception */ public final static String encrypt(String password) { try { byte[] aa=password.getBytes("Unicode"); byte[] aa1=new byte[aa.length-2]; for(int i=2;i<aa.length;i++) aa1[i-2]=aa[i]; byte[] temp=encrypt(aa1, PASSWORD_CRYPT_KEY.getBytes()); return byte2hex(temp); } catch (Exception e) { } return null; } /** * 二行制转字符串 * @param b * @return */ public static String byte2hex(byte[] b) { String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); if (stmp.length() == 1) hs = hs + "0" + stmp; else hs = hs + stmp; } return hs.toUpperCase(); } public static byte[] hex2byte(byte[] b) { if ((b.length % 2) != 0) throw new IllegalArgumentException("长度不是偶数"); byte[] b2 = new byte[b.length / 2]; for (int n = 0; n < b.length; n += 2) { String item = new String(b, n, 2); b2[n / 2] = (byte) Integer.parseInt(item, 16); } return b2; } }