AES128.java

package com.drcom.Android.DrCOMWS.Tool;

/**
 * Created by brady on 15-9-18.
 */

import android.util.Log;


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

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

/**
 *
 * @author Administrator
 *
 */
public class AES128 {

    // 加密
    public static String encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            System.out.print("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

        return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

    // 解密
    public static String decrypt(String sSrc, String sKey) throws Exception {
        try {
            // 判断Key是否正确
            Log.e("AES","start:"+String.valueOf(sKey)+"end");
            if (sKey == null) {
                Log.e("AES","Key为空null");
                return null;
            }
            Log.e("AES","checkpoint2");

            // 判断Key是否为16位
            if (sKey.length() != 16) {
                Log.e("AES"," Key长度不是16位");
                Log.e("AES",sKey);
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            Log.e("AES", "checkpoint3");

            byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
            try {
                Log.e("AES","checkpoint4");

                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,"utf-8");
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }


}

//源代码片段来自云代码http://yuncode.net