[转]JAVA AES 加密算法

本文转自：http://blog.sina.com.cn/s/blog_7c8eb1590100svr0.html

package com.siro.tools;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class AESPlus {

    public static String encrypt(String strKey, String strIn) throws Exception {
        SecretKeySpec skeySpec = getKey(strKey);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(strIn.getBytes());

        return new BASE64Encoder().encode(encrypted);
    }

    public static String decrypt(String strKey, String strIn) throws Exception {
        SecretKeySpec skeySpec = getKey(strKey);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] encrypted1 = new BASE64Decoder().decodeBuffer(strIn);

        byte[] original = cipher.doFinal(encrypted1);
        String originalString = new String(original);
        return originalString;
    }

    private static SecretKeySpec getKey(String strKey) throws Exception {
        byte[] arrBTmp = strKey.getBytes();
        byte[] arrB = new byte[16]; // 创建一个空的16位字节数组（默认值为0）

        for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
            arrB[i] = arrBTmp[i];
        }

        SecretKeySpec skeySpec = new SecretKeySpec(arrB, "AES");

        return skeySpec;
    }

    public static void main(String[] args) throws Exception {
        String Code = "中文ABc123";
        String key = "1q2w3e4r";
        String codE;

        codE = AESPlus.encrypt(key, Code);

        System.out.println("原文：" + Code);
        System.out.println("密钥：" + key);
        System.out.println("密文：" + codE);
        System.out.println("解密：" + AESPlus.decrypt(key, codE));
    }
}