Java实现AES加密解密

之前常用两种加密算法：Base64和Md5，前者容易破解，后者不可逆。

AES采用对称加密方式，破解难度非常大，在可逆的基础上，能很好的保证数据的安全性。

这里介绍Java中实现AES加密算法的加密与解密实现：

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

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

import org.springframework.util.Base64Utils;

import org.yaml.snakeyaml.external.biz.base64Coder.Base64Coder;

import javax.crypto.*;

import javax.crypto.spec.SecretKeySpec;

import java.io.UnsupportedEncodingException;

import java.security.Key;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

public class AesUtil {

    public static void main(String[] args) throws UnsupportedEncodingException {

        for (int i = 0; i < 10; i++) {

            String key = generateKey(); // 提前生成的一个key

            String ps = encode(key, "123");

            System.out.println("加密: " + ps);

            String res = decode(key, ps);

            System.out.println("解密: " + res);

        }

    }

    /**

     * 生成key

     * @return

     */

    public static String generateKey() {

        try {

            KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");

            keyGenerator.init(new SecureRandom());

            SecretKey secretKey = keyGenerator.generateKey();

            byte[] byteKey = secretKey.getEncoded();

            return Hex.encodeHexString(byteKey);

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        }

        return null;

    }

    /**

     * AES加密

     * @param thisKey

     * @param data

     * @return

     */

    public static String encode(String thisKey, String data) {

        try {

            // 转换KEY

            Key key = new SecretKeySpec(Hex.decodeHex(thisKey),"AES");

            //System.out.println(thisKey);

            // 加密

            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

            cipher.init(Cipher.ENCRYPT_MODE, key);

            byte[] result = cipher.doFinal(data.getBytes());

            return Hex.encodeHexString(result);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

    /**

     * AES解密

     * @param thisKey

     * @param data

     * @return

     */

    public static String decode(String thisKey, String data) {

        try {

            // 转换KEY

            Key key = new SecretKeySpec(Hex.decodeHex(thisKey),"AES");

            // 解密

            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

            cipher.init(Cipher.DECRYPT_MODE, key);

            byte[] result = cipher.doFinal(Hex.decodeHex(data));

            return new String(result);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

}