3DES加密解密的例子
package com.snailteam.adserver.until;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import javax.crypto.*;import javax.crypto.spec.SecretKeySpec;/** * @author :xiaofancn * @version ：2011-11-11 上午11:02:22 * */ public class Tool3DES {private static final String Algorithm = "DESede"; // 定义 加密算法,可用private static final int Keysize = 168;/** * 将byte[]转化成16进制字符串 * @param buf * @return */public static String parseByte2HexStr(byte buf[]) {StringBuffer sb = new StringBuffer();for (int i = 0; i < buf.length; i++) {String hex = Integer.toHexString(buf[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}sb.append(hex.toUpperCase());}return sb.toString();}/** * 将16进制字符串转化成byte[] * @param buf * @return */public static byte[] parseHexStr2Byte(String hexStr) {if (hexStr.length() < 1)return null;byte[] result = new byte[hexStr.length() / 2];for (int i = 0; i < hexStr.length() / 2; i++) {int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),16);result[i] = (byte) (high * 16 + low);}return result;}/** * 加密 * message->密文byte[]->16进制密文字符串 * @param password * @param message * @return */public static String encrypt(String password, String message) {try {KeyGenerator kgen = KeyGenerator.getInstance(Algorithm);kgen.init(Keysize, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, Algorithm);Cipher cipher = Cipher.getInstance(Algorithm);// 创建密码器byte[] byteContent = message.getBytes("utf-8");cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化byte[] result = cipher.doFinal(byteContent);return parseByte2HexStr(result);} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}/** * 解密 * 16进制密文字符串->byte[]->解密 * @param password * @param message * @return */public static String decrypt(String password, String message) {KeyGenerator kgen;try {kgen = KeyGenerator.getInstance(Algorithm);kgen.init(Keysize, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, Algorithm);Cipher cipher = Cipher.getInstance(Algorithm);// 创建密码器byte[] byteContent = parseHexStr2Byte(message);cipher.init(Cipher.DECRYPT_MODE, key);// 初始化byte[] result = cipher.doFinal(byteContent);return new String(result);} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}return null;}public static void main(String[] args) {String content = "你好";String password = "123456789";System.out.println("加密前："+content);String temp = encrypt(password, content);System.out.println("加密后："+temp);temp = decrypt(password, temp);System.out.println("解密后："+temp);}}?