PHP-AES加密解密算法

来源：互联网发布：php replace函数用法编辑：程序博客网时间：2024/05/26 02:51
<?phpclass AESUtil{    protected $cipher = MCRYPT_RIJNDAEL_128;    protected $mode = MCRYPT_MODE_ECB;    protected $pad_method = NULL;    protected $secret_key = '';    protected $iv = '';    public function set_cipher($cipher)    {        $this->cipher = $cipher;    }    public function set_mode($mode)    {        $this->mode = $mode;    }    public function set_iv($iv)    {        $this->iv = $iv;    }    public function set_key($key)    {        $this->secret_key = $key;    }    public function require_pkcs5()    {        $this->pad_method = 'pkcs5';    }    protected function pad_or_unpad($str, $ext)    {        if ( is_null($this->pad_method) )        {            return $str;        }        else        {            $this->pkcs5_pad();            $func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';            if ( is_callable($func_name) )            {                $size = mcrypt_get_block_size($this->cipher, $this->mode);                return call_user_func($func_name, $str, $size);            }        }        return $str;    }    protected function pad($str)    {        return $this->pad_or_unpad($str, '');    }    protected function unpad($str)    {        return $this->pad_or_unpad($str, 'un');    }    public function encrypt($str)    {        $str = $this->pad($str);        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');        if ( empty($this->iv) )        {            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);        }        else        {            $iv = $this->iv;        }        mcrypt_generic_init($td, $this->secret_key, $iv);        $cyper_text = mcrypt_generic($td, $str);        $rt=self::base64url_encode($cyper_text);        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $rt;    }    public function decrypt($str)    {        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');        if ( empty($this->iv) )        {            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);        }        else        {            $iv = $this->iv;        }        mcrypt_generic_init($td, $this->secret_key, $iv);        $decrypted_text = mdecrypt_generic($td, self::base64url_decode($str));        $rt = $decrypted_text;        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $this->unpad($rt);    }    public static function pkcs5_pad($text, $blocksize)    {        $pad = $blocksize - (strlen($text) % $blocksize);        return $text . str_repeat(chr($pad), $pad);    }    public static function pkcs5_unpad($text)    {        $pad = ord($text{strlen($text) - 1});        if ($pad > strlen($text)) return false;        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;        return substr($text, 0, -1 * $pad);    }    public static function base64url_encode($data)     {        return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');    }    public static function base64url_decode($data)     {        return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));    }}
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