TestAES256--这才是加密的最佳方式，目前。毕竟是advance

//代码与DES的基本一致，除了使用规范，初始化长度替换下
//注意事项：需要替换jre/lib/security下的*_policy.jar，附上全版本替换JCE附件。
//链接: http://pan.baidu.com/s/1dDLE1Gl 提取密码: 6sqw
import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class TestAES256 {
	
public static String KEY_ALGORITHM ="AES";
	
	public static String CIPHER_ALOGITHM ="AES/ECB/PKCS5Padding";
	
	public static void main(String[] args) throws Exception{
		String s = "AES";
		System.out.println("原文： " + s);
		byte[] key = initKey();
		System.out.println("密钥： " + Base64.encodeBase64String(key));
		byte[] afterEncrypt = encrypt(s.getBytes(), key);
		System.out.println("加密后:" + Base64.encodeBase64String(afterEncrypt));
		
		byte[] afterDecrypt = decrypt(afterEncrypt, key);
		System.out.println("解密后：" + new String(afterDecrypt));
		
	}
	
	public static byte[] initKey() throws Exception {
		KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
		kg.init(256);
		SecretKey sk = kg.generateKey();
		return sk.getEncoded();
	}
	
	/**
	 * 转换密钥
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static Key toKey(byte[] key) throws Exception {
		//获取密钥模具，规范
		SecretKey ss = new SecretKeySpec(key, KEY_ALGORITHM);

		return ss;
	}
	
	public static byte[] encrypt(byte[] date, byte[] key) throws Exception {
		//还原密钥
		Key k = toKey(key);
		Cipher cipher = Cipher.getInstance(CIPHER_ALOGITHM);
		cipher.init(Cipher.ENCRYPT_MODE, k);
		return cipher.doFinal(date);
	}
	
	/**
	 * 解密
	 * @param date
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decrypt(byte[] date, byte[] key) throws Exception {
		//还原密钥
		Key k = toKey(key);
		Cipher cipher = Cipher.getInstance(CIPHER_ALOGITHM);
		cipher.init(Cipher.DECRYPT_MODE, k);
		return cipher.doFinal(date);
	}

}