Prpcrypt.php
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<?php
// +----------------------------------------------------------------------
// | WeChatDeveloper
// +----------------------------------------------------------------------
// | 版权所有 2014~2022 广州楚才信息科技有限公司 [ http://www.cuci.cc ]
// +----------------------------------------------------------------------
// | 官方网站: https://thinkadmin.top
// +----------------------------------------------------------------------
// | 开源协议 ( https://mit-license.org )
// +----------------------------------------------------------------------
// | github开源项目：https://github.com/zoujingli/WeChatDeveloper
// +----------------------------------------------------------------------
namespace WeChat\Prpcrypt;
/**
* 公众号消息 - 加解密
* Class Prpcrypt
*/
class Prpcrypt
{
public $key;
/**
* Prpcrypt constructor.
* @param $key
*/
function __construct($key)
{
$this->key = base64_decode("{$key}=");
}
/**
* 对明文进行加密
* @param string $text 需要加密的明文
* @param string $appid 公众号APPID
* @return array
*/
public function encrypt($text, $appid)
{
try {
$random = $this->getRandomStr();
$iv = substr($this->key, 0, 16);
$pkcEncoder = new PKCS7Encoder();
$text = $pkcEncoder->encode($random . pack("N", strlen($text)) . $text . $appid);
$encrypted = openssl_encrypt($text, 'AES-256-CBC', substr($this->key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
return [ErrorCode::$OK, $encrypted];
} catch (\Exception $e) {
return [ErrorCode::$EncryptAESError, null];
}
}
/**
* 对密文进行解密
* @param string $encrypted 需要解密的密文
* @return array
*/
public function decrypt($encrypted)
{
try {
$iv = substr($this->key, 0, 16);
$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', substr($this->key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
} catch (\Exception $e) {
return [ErrorCode::$DecryptAESError, null];
}
try {
$pkcEncoder = new PKCS7Encoder();
$result = $pkcEncoder->decode($decrypted);
if (strlen($result) < 16) {
return [ErrorCode::$DecryptAESError, null];
}
$content = substr($result, 16, strlen($result));
$len_list = unpack("N", substr($content, 0, 4));
$xml_len = $len_list[1];
return [0, substr($content, 4, $xml_len), substr($content, $xml_len + 4)];
} catch (\Exception $e) {
return [ErrorCode::$IllegalBuffer, null];
}
}
/**
* 随机生成16位字符串
* @param string $str
* @return string 生成的字符串
*/
function getRandomStr($str = "")
{
$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
$max = strlen($str_pol) - 1;
for ($i = 0; $i < 16; $i++) {
$str .= $str_pol[mt_rand(0, $max)];
}
return $str;
}
}