AES/DES加密工具类

一、业务场景说明：

　　业务功能是实现二维码数据加密传输，并在安卓端和硬件设备端调用，实现动态刷新和时效判断。所以这里使用双层加密，外层BASE64加密，以定位到分钟的时间戳进行加密（二维码时效为一分钟），在被调用时，只需调用端获取（与服务器一直的）本地当前定位到分钟的时间戳进行解密，然后用解密得到的密文数据生成二维码即可，如果不能解密成功，则表示二维码安卓端获取到的当前时间戳已失效。设备端扫描二维码之后，进行内层解密，得到原始数据并进行校验。

二、依赖

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>${commons-codec.version}</version>
</dependency>

　其余依赖JRE中都有

三、代码

package com.xfc.util;// TODO

import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base32;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

public class QREncrypt {

    public static Key DEFAULT_KEY = null;

    public static final String DEFAULT_SECRET_KEY1 = "?:P)(OL><KI*&UJMNHY^%TGBVFR$#EDCXSW@!QAZ";
    public static final String DEFAULT_SECRET_KEY2 = "1qaz2wsx3edc4rfv5tgb6yhn7ujm8ik,9ol.0p;/";
    public static final String DEFAULT_SECRET_KEY3 = "!QAZ@WSX#EDC$RFV%TGB^YHN&UJM*IK<(OL>)P:?";
    public static final String DEFAULT_SECRET_KEY4 = "1qaz@WSX3edc$RFV5tgb^YHN7ujm*IK<9ol.)P:?";
    public static final String DEFAULT_SECRET_KEY5 = "!QAZ2wsx#EDC4rfv%TGB6yhn&UJM8ik,(OL>0p;/";
    public static final String DEFAULT_SECRET_KEY6 = "1qaz2wsx3edc4rfv5tgb^YHN&UJM*IK<(OL>)P:?";
    public static final String DEFAULT_SECRET_KEY = DEFAULT_SECRET_KEY1;

    public static final String AES = "AES";// public static final String DES = "DES";

    public static final Base32 base32 = new Base32();

    static {
        DEFAULT_KEY = obtainKey(DEFAULT_SECRET_KEY);
    }

    /**
     * 获得key
     **/
    public static Key obtainKey(String key) {
        if (key == null) {
            return DEFAULT_KEY;
        }
        KeyGenerator generator = null;
        try {
            generator = KeyGenerator.getInstance(AES);
            //generator.init(new SecureRandom(key.getBytes()));
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
            secureRandom.setSeed(key.getBytes());
            generator.init(secureRandom);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        Key key1 = generator.generateKey();
        generator = null;
        return key1;
    }

    /**
     * 加密<br>
     * String明文输入,String密文输出
     */
    public static String encode(String str) {
        return encode64(null, str);
    }

    /**
     * 加密<br>
     * String明文输入,String密文输出
     */
    public static String encode64(String key, String str) {
        byte[] bytes = obtainEncode(key, str.getBytes());
        return Base64.encodeBase64URLSafeString(bytes);
    }

    /**
     * 加密<br>
     * String明文输入,String密文输出
     */
    public static String encode32(String key, String str) {
        return base32.encodeAsString(obtainEncode(key, str.getBytes())).replaceAll("=", "");
    }

    /**
     * 加密<br>
     * String明文输入,String密文输出
     */
    public static String encode16(String key, String str) {
        return Hex.encodeHexString(obtainEncode(key, str.getBytes()));
    }

    /**
     * 解密<br>
     * 以String密文输入,String明文输出
     */
    public static String decode(String str) {
        return decode64(null, str);
    }

    /**
     * 解密<br>
     * 以String密文输入,String明文输出
     */
    public static String decode64(String key, String str) {
        byte[] bytes = Base64.decodeBase64(str);
        return new String(obtainDecode(key, bytes));
    }

    /**
     * 解密<br>
     * 以String密文输入,String明文输出
     */
    public static String decode32(String key, String str) {
        return new String(obtainDecode(key, base32.decode(str)));
    }

    /**
     * 解密<br>
     * 以String密文输入,String明文输出
     */
    public static String decode16(String key, String str) {
        try {
            return new String(obtainDecode(key, Hex.decodeHex(str.toCharArray())));
        } catch (DecoderException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 加密<br>
     * 以byte[]明文输入,byte[]密文输出
     */
    private static byte[] obtainEncode(String key, byte[] str) {
        byte[] byteFina = null;
        Cipher cipher;
        try {
            Key key1 = obtainKey(key);
            cipher = Cipher.getInstance(AES);
            cipher.init(Cipher.ENCRYPT_MODE, key1);
            byteFina = cipher.doFinal(str);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            cipher = null;
        }
        return byteFina;
    }

    /**
     * 解密<br>
     * 以byte[]密文输入,以byte[]明文输出
     */
    private static byte[] obtainDecode(String key, byte[] str) {
        Cipher cipher;
        byte[] byteFina = null;
        try {
            Key key1 = obtainKey(key);
            cipher = Cipher.getInstance(AES);
            cipher.init(Cipher.DECRYPT_MODE, key1);
            byteFina = cipher.doFinal(str);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            cipher = null;
        }
        return byteFina;
    }

    public static String getQRTimestamp() {
        String time = TimeUtils.formatDate(TimeUtils.DB_TIME_PATTERN_F2);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        time = time.substring(0, time.lastIndexOf(":") + 1) + "00";
        Date date = new Date();
        try{
            date = sdf.parse(time);
        } catch (Exception e) {
            e.printStackTrace();
        }
        long timestamp = date.getTime();
        return String.valueOf(timestamp);
    }

    public static String qrEncrypt(String key, String data) {
        String timestamp = getQRTimestamp();
        String s = encode32(key, data);
        String newData = timestamp + ";" + s;
        System.out.println("newData = " + newData);
        String s1 = encode64(timestamp, newData);
        return s1;
    }

    public static String qrDecrypt(String key, String data) {
        String timestamp = getQRTimestamp();
        String n1 = decode64(timestamp, data);
        String orignTimestamp = n1.split(";")[0];
        String m4 = n1.split(";")[1];
        String n = decode32(key, m4);
        return n;
    }
public static void main(String[] args) {
        String data = "{'username': 'admin', 'password': '123456'}";
        System.out.println("加密前的数据 = " + data);
        String s = qrEncrypt(DEFAULT_SECRET_KEY, data);
        System.out.println("加密后的数据 = " + s);
        String ddd = qrDecrypt(DEFAULT_SECRET_KEY, s);
        System.out.println("解密后的数据 = " + ddd);
        System.out.println("解密后的数据是否与原数据一致： ------ " + data.equals(ddd));
    }
}

四、测试 main() 输出结果

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