자바 jce 대칭 암호 화 알고리즘 인 스 턴 스 (jdk 1.6)

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        128 、192  256 。
		kg.init(56);
		//       
		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;

	}
}