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;

	}
}

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