前言

由于工作关系,经常需要和机构对接接口,遇到各种各样的加密方式,踩了不少的坑,特别是网上php加密的示例代码都是调用mcrypt扩展包函数,而这个扩展在php71开始就废弃了. 这一系列文章将对各种加密做一个总结,示例代码包含php和java两个版本,方便大家对照.

AES

AES加密

java示例

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.util.Base64;

public class Test
{

    public static void main(String[] args)
    {
        new Test().go();
    }

    public void go()
    {
        Base64.Encoder encode = Base64.getEncoder();
        Base64.Decoder decoder = Base64.getDecoder();

        // 实例化 aes类
        Aes aes = new Aes("D2E31857FB4C4C9439EDED69F5A85775");
        try {
            // 需要加密字符串
            String context = "hello world!";
            byte[] aesByte = aes.encode(context);
            // 将ase_encode的结果base64_encode处理
            String aesString = encode.encodeToString(aesByte);
            System.out.println(aesString);

            //将加密后的字符串先base64_decode处理
            aesByte = decoder.decode(aesString);
            //解密
            String desString = aes.decode(aesByte);
            System.out.println(desString);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    class Aes
    {
        private String key;

        public Aes(String key)
        {
            this.key = key;
        }

        /**
         * @param context
         * @return byte[]
         * @throws Exception
         */
        public byte[] encode(String context) throws Exception
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");

            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(key.getBytes());
            kgen.init(128, secureRandom);

            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
            return cipher.doFinal(context.getBytes("utf8"));
        }

        public String decode(byte[] encryptBytes) throws Exception
        {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(key.getBytes());
            kgen.init(128, secureRandom);

            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
            byte[] decryptBytes = cipher.doFinal(encryptBytes);
            return new String(decryptBytes, "UTF-8");
        }
    }
}

// 输出
//kp/X5brtF+IKUO5+7aCRDw==
//hello world!

接下来看看php

<?php
class Aes
{
    private $key;

    public function __construct($key)
    {
        $this->key = $key;
    }
    public function encode($str)
    {
        $key = $this->getSslKey();
        return openssl_encrypt($str, 'AES-128-ECB', $key, 1);
    }

    public function decode($str)
    {
        $key = $this->getSslKey();
        return openssl_decrypt($t, 'AES-128-ECB', $key, 1);
    }

    public function getSslKey()
    {
        $key = substr(openssl_digest(openssl_digest($this->key, 'sha1', true), 'sha1', true), 0, 16);
        return $key;
    }
}

$str = "hello world!";
$aes = new Aes('D2E31857FB4C4C9439EDED69F5A85775');
$encode_str = base64_encode($aes->encode($str));
echo $encode_str . PHP_EOL;
echo $aes->encode(base64_decode($encode_str)) . PHP_EOL;

// 输出
//kp/X5brtF+IKUO5+7aCRDw==
//hello world!

结语

未完待续