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本文實例講述了PHP實現的AES加密、解密封裝類與用法。分享給大家供大家參考，具體如下：

001<?php
002/**
003 * Class AES
004 * 用于AES加解密數據
005 * time:2018-04-27
006 */
007class AES
008{
009  protected $cipher = MCRYPT_RIJNDAEL_256; //AES加密算法
010  protected $mode = MCRYPT_MODE_CBC; //采用cbc加密模式
011  protected $key; //密鑰
012  protected $iv; //cbc模式加密向量，如為空將采用密鑰代替
013  /**
014   * AES constructor.
015   *
016   * @param   $key 密鑰
017   * @param null $iv 向量 可選 如為空將采用密鑰代替
018   *
019   * @throws Exception
020   */
021  public function __construct($key, $iv = NULL)
022  {
023    if (!extension_loaded("mcrypt")) {
024//      throw new \Exception("mcrypt extension do not exist. it was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0. use OpenSSL instead");
025    }
026    $this->key = $key;
027    $this->iv = $iv;
028  }
029  /**
030   * 加密數據
031   * @param $data
032   *
033   * @return string
034   */
035  public function encrypt($data)
036  {
037    $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
038    $key = hash("sha256", $this->key, true);
039    $iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
040    $data = $this->padding($data);
041    mcrypt_generic_init($td, $key, $iv);
042    $encryptedData = base64_encode(mcrypt_generic($td, $data));
043    mcrypt_generic_deinit($td);
044    mcrypt_module_close($td);
045    return $encryptedData;
046  }
047  /**
048   * 解密數據
049   * @param $data
050   *
051   * @return bool|string
052   */
053  public function decrypt($data)
054  {
055    $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
056    $key = hash("sha256", $this->key, true);
057    $iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
058    mcrypt_generic_init($td, $key, $iv);
059    $decrypted_data = mdecrypt_generic($td, base64_decode($data));
060    mcrypt_generic_deinit($td);
061    mcrypt_module_close($td);
062    return $this->unPadding($decrypted_data);
063  }
064  /**
065   * 填充數據到分組大小的整數倍
066   * @param null $data
067   *
068   * @return string
069   */
070  protected function padding($data = null)
071  {
072    $blockSize = 32; //MCRYPT_RIJNDAEL_256算法的分組大小是32字節
073    $pad = $blockSize - (strlen($data) % $blockSize);
074    return $data . str_repeat(chr($pad), $pad);
075  }
076  /**
077   * 去掉填充的數據
078   * @param null $data
079   *
080   * @return bool|string
081   */
082  protected function unPadding($data = null)
083  {
084    $pad = ord($data[strlen($data) - 1]);
085    if ($pad > strlen($data)) {
086      return false;
087    }
088    if (strspn($data, chr($pad), strlen($data) - $pad) != $pad) {
089      return false;
090    }
091    return substr($data, 0, -1 * $pad);
092  }
093  /**
094   * @return mixed
095   */
096  public function getSecretKey()
097  {
098    return $this->key;
099  }
100  /**
101   * @param mixed $key
102   */
103  public function setSecretKey($key)
104  {
105    $this->key = $key;
106  }
107  /**
108   * @return null
109   */
110  public function getIv()
111  {
112    return $this->iv;
113  }
114  /**
115   * @param null $iv
116   */
117  public function setIv($iv)
118  {
119    $this->iv = $iv;
120  }
121}
122//使用方法：
123$keyStr = 'sq8f77fwhksk';
124$aes = new AES($keyStr);
125$str = 'www.zmynmublwnt.cn';
126$chgstr = $aes->encrypt($str);
127echo $chgstr;
128echo "<br/>";
129$rstr = $aes->decrypt($chgstr);
130echo $rstr;
131?>