AES加解密在php接口请求过程中的应用示例

<?php

/**
 * 加密基础类
 */

class Crypt_AES
{
  protected $_cipher = "rijndael-128";
  protected $_mode = "cbc";
  protected $_key;
  protected $_iv = null;
  protected $_descriptor = null;

  /**
   * 是否按照PKCS #7 的标准进行填充
   * 为否默认将填充“\0”补位
   * @var boolean
   */
  protected $_PKCS7 = false;

  /**
   * 构造函数，对于密钥key应区分2进制字符串和16进制的。
   * 如需兼容PKCS#7标准，应选项设置开启PKCS7，默认关闭
   * @param string $key 
   * @param mixed $iv   向量值
   * @param array $options
   */
  public function __construct($key = null, $iv = null, $options = null)
  {
    if (null !== $key) {
      $this->setKey($key);
    }

    if (null !== $iv) {
      $this->setIv($iv);
    }

    if (null !== $options) {
      if (isset($options['chipher'])) {
        $this->setCipher($options['chipher']);
      }

      if (isset($options['PKCS7'])) {
        $this->isPKCS7Padding($options['PKCS7']);
      }

      if (isset($options['mode'])) {
        $this->setMode($options['mode']);
      }
    }
  }

  /**
   * PKCS#7状态查看，传入Boolean值进行设置
   * @param boolean $flag
   * @return boolean
   */
  public function isPKCS7Padding($flag = null)
  {
    if (null === $flag) {
      return $this->_PKCS7;
    }
    $this->_PKCS7 = (bool) $flag;
  }

  /**
   * 开启加密算法
   * @param string $algorithm_directory locate the encryption 
   * @param string $mode_directory
   * @return Crypt_AES
   */
  public function _openMode($algorithm_directory = "" , $mode_directory = "") 
  {
    $this->_descriptor = mcrypt_module_open($this->_cipher, 
                        $algorithm_directory, 
                        $this->_mode,
                        $mode_directory);
    return $this;
  }

  public function getDescriptor()
  {
    if (null === $this->_descriptor) {
      $this->_openMode();
    }
    return $this->_descriptor;
  }

  protected function _genericInit()
  {
    return mcrypt_generic_init($this->getDescriptor(), $this->getKey(), $this->getIv());
  }

  protected function _genericDeinit()
  {
    return mcrypt_generic_deinit($this->getDescriptor());
  }

  public function getMode()
  {
    return $this->_mode;
  }
  
  public function setMode($mode)
  {
    $this->_mode = $mode;
    return $this;
  }

  public function getCipher()
  {
    return $this->_cipher;
  }
  
  public function setCipher($cipher)
  {
    $this->_cipher = $cipher;
    return $this;
  }  
  /**
   * 获得key
   * @return string
   */
  public function getKey()
  {
    return $this->_key;
  }
  
  /**
   * 设置可以
   * @param string $key
   */
  public function setKey($key)
  {
    $this->_key = $key;
    return $this;
  }  


  /**
   * 获得加密向量块,如果其为null时将追加当前Descriptor的IV大小长度
   *
   * @return string
   */
  public function getIv()
  {
    if (null === $this->_iv && in_array($this->_mode, array( "cbc", "cfb", "ofb", ))) {
      $size = mcrypt_enc_get_iv_size($this->getDescriptor());
      $this->_iv = str_pad("", 16, "\0");
    }
    return $this->_iv;
  }

  /**
   * 获得向量块
   *
   * @param string $iv
   * @return Crypt_AES $this
   */
  public function setIv($iv)
  {
    $this->_iv = $iv;
    return $this;
  }  

  /**
   * 加密
   * @param string $str 被加密文本
   * @return string
   */
  public function encrypt($str){
    $td = $this->getDescriptor();
    $this->_genericInit();
    $bin = mcrypt_generic($td, $this->padding($str));
    $this->_genericDeinit();

    return $bin;
  }
 
  public function padding($dat)
  {
    if ($this->isPKCS7Padding()) {
      $block = mcrypt_enc_get_block_size($this->getDescriptor());
   
      $len = strlen($dat);
      $padding = $block - ($len % $block);
      $dat .= str_repeat(chr($padding),$padding);      
    }

    return $dat;
  }

  public function unpadding($str)
  {
    if ($this->isPKCS7Padding()) {
      $pad = ord($str[($len = strlen($str)) - 1]);
      $str = substr($str, 0, strlen($str) - $pad);
    }
    return $str;
  }

  /**
   * 解密
   * @param string $str 
   * @return string
   */
  public function decrypt($str){
    $td = $this->getDescriptor();

    $this->_genericInit();
    $text = mdecrypt_generic($td, $str);
    $this->_genericDeinit();

    return $this->unpadding($text);
  }
  
  /**
   * 16进制转成2进制数据
   * @param string $hexdata 16进制字符串
   * @return string
   */
  public static function hex2bin($hexdata) 
  {
    return pack("H*" , $hexdata);
  }

  /**
   * 字符串转十六进制
   * @param string $hexdata 16进制字符串
   * @return string
   */
  public static function strToHex($string)
  {
    $hex='';
    for($i=0;$i<strlen($string);$i++)
      $hex.=dechex(ord($string[$i]));
    $hex=strtoupper($hex);
    return $hex;
  }

  /**
   * 十六进制转字符串
   * @param string $hexdata 16进制字符串
   * @return string
   */
  function hexToStr($hex)
  {
    $string='';
    for($i=0;$i<strlen($hex)-1;$i+=2)
      $string.=chr(hexdec($hex[$i].$hex[$i+1]));
    return $string;
  }
}

<?php 

include 'AES.php';

$md5Key = 'ThisIsAMd5Key';               // 对应服务端：$md5key = 'ThisIsAMd5Key';
$aesKey = Crypt_AES::strToHex('1qa2ws4rf3edzxcv');   // 对应服务端：$aesKey = '3171613277733472663365647A786376';
$aesKey = Crypt_AES::hex2bin($aesKey);
$aesIV = Crypt_AES::strToHex('dfg452ws');       // 对应服务端：$aesIV = '6466673435327773';
$aes = new Crypt_AES($aesKey,$aesIV,array('PKCS7'=>true, 'mode'=>'cbc'));

// var_dump($aes);

$data['name'] = 'idoubi';
$data['sex']= 'male';
$data['age'] = 23;
$data['signature'] = '白天我是一个程序员，晚上我就是一个有梦想的演员。';

$content = base64_encode($aes->encrypt(json_encode($data)));
$content = urlencode($content);
$sign = md5($content.$md5Key);

$url = 'http://localhost/aesdemo/api.php';
$params = "version=1.0&sign=$sign&content=$content";

// 请求接口
post($url, $params);

/**
 * 接口请求函数
 */
function post($url, $params) {
  $curlPost= $params;
  $ch = curl_init();   //初始化curl
  curl_setopt($ch, CURLOPT_URL, $url);  //提交到指定网页
  curl_setopt($ch, CURLOPT_HEADER, 0);  //设置header
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  //要求结果为字符串且输出到屏幕上
  curl_setopt($ch, CURLOPT_POST, 1);  //post提交方式
  curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
  $result = curl_exec($ch);//运行curl
  curl_close($ch);
  var_dump(json_decode($result, true));
}

<?php 


include 'AES.php';

$data = $_POST; // 接口请求得到的数据
$content = $data['content'];
$sign = $data['sign'];

$aesKey = '3171613277733472663365647A786376';
$aesIV = '6466673435327773';
$md5key = 'ThisIsAMd5Key';

// 校验数据
if(strcasecmp(md5(urlencode($content).$md5key),$sign) == 0) {
  // 数据校验成功
  $key = Crypt_AES::hex2bin($aesKey);
  $aes = new Crypt_AES($key, $aesIV, array('PKCS7'=>true, 'mode'=>'cbc'));

  $decrypt = $aes->decrypt(base64_decode($content));
  if (!$decrypt) {   // 解密失败
    echo json_encode('can not decrypt the data');
  } else {
    echo json_encode($decrypt);   // 解密成功
  }
} else{
  echo json_encode('data is not integrity');    // 数据校验失败
}