java jce 对称加密算法实例(jdk1.6)
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package com.simon.security;import java.io.UnsupportedEncodingException;import java.security.Key;import java.security.NoSuchAlgorithmException;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;public class JceTest {public static void main(String[] args) throws NoSuchAlgorithmException, UnsupportedEncodingException{KeyGenerator kg = KeyGenerator.getInstance("DES");// AES 要求密钥长度为128位、192位或256位。kg.init(56);// 生成秘密密钥SecretKey secretKey = kg.generateKey();byte[] key = secretKey.getEncoded();System.out.println(secretKey);System.out.println(key);byte[] encode = getEncCode(new String("hello").getBytes(), secretKey);byte[] decode = getDesCode(encode, secretKey);System.out.println( encode );System.out.println( new String(decode,"UTF-8") );}public static byte[] getEncCode(byte[] byteS, Key key) {byte[] byteFina = null;Cipher cipher;try {cipher = Cipher.getInstance("DES");cipher.init(Cipher.ENCRYPT_MODE, key);byteFina = cipher.doFinal(byteS);} catch (Exception e) {e.printStackTrace();} finally {cipher = null;}return byteFina;}public static byte[] getDesCode(byte[] byteD , Key key) {Cipher cipher;byte[] byteFina = null;try {cipher = Cipher.getInstance("DES");cipher.init(Cipher.DECRYPT_MODE, key);byteFina = cipher.doFinal(byteD);} catch (Exception e) {e.printStackTrace();} finally {cipher = null;}return byteFina;}}