<?php
|
include_once "errorCode.php";
|
/**
|
* PKCS7Encoder class
|
*
|
* 提供基于PKCS7算法的加解密接口.
|
*/
|
class PKCS7Encoder
|
{
|
public static $block_size = 32;
|
/**
|
* 对需要加密的明文进行填充补位
|
* @param $text 需要进行填充补位操作的明文
|
* @return 补齐明文字符串
|
*/
|
function encode($text)
|
{
|
$block_size = PKCS7Encoder::$block_size;
|
$text_length = strlen($text);
|
//计算需要填充的位数
|
$amount_to_pad = PKCS7Encoder::$block_size - ($text_length % PKCS7Encoder::$block_size);
|
if ($amount_to_pad == 0) {
|
$amount_to_pad = PKCS7Encoder::block_size;
|
}
|
//获得补位所用的字符
|
$pad_chr = chr($amount_to_pad);
|
$tmp = "";
|
for ($index = 0; $index < $amount_to_pad; $index++) {
|
$tmp .= $pad_chr;
|
}
|
return $text . $tmp;
|
}
|
/**
|
* 对解密后的明文进行补位删除
|
* @param decrypted 解密后的明文
|
* @return 删除填充补位后的明文
|
*/
|
function decode($text)
|
{
|
$pad = ord(substr($text, -1));
|
if ($pad < 1 || $pad > PKCS7Encoder::$block_size) {
|
$pad = 0;
|
}
|
return substr($text, 0, (strlen($text) - $pad));
|
}
|
}
|
/**
|
* Prpcrypt class
|
*
|
* 提供接收和推送给公众平台消息的加解密接口.
|
*/
|
class Prpcrypt
|
{
|
public $key = null;
|
public $iv = null;
|
/**
|
* Prpcrypt constructor.
|
* @param $k
|
*/
|
public function __construct($k)
|
{
|
$this->key = base64_decode($k . '=');
|
$this->iv = substr($this->key, 0, 16);
|
}
|
/**
|
* 加密
|
*
|
* @param $text
|
* @param $receiveId
|
* @return array
|
*/
|
public function encrypt($text, $receiveId)
|
{
|
try {
|
//拼接
|
$text = $this->getRandomStr() . pack('N', strlen($text)) . $text . $receiveId;
|
//添加PKCS#7填充
|
$pkc_encoder = new PKCS7Encoder;
|
$text = $pkc_encoder->encode($text);
|
//加密
|
$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
|
return [ErrorCode::$OK, $encrypted];
|
} catch (Exception $e) {
|
print $e;
|
return [MyErrorCode::$EncryptAESError, null];
|
}
|
}
|
/**
|
* 解密
|
*
|
* @param $encrypted
|
* @param $receiveId
|
* @return array
|
*/
|
public function decrypt($encrypted, $receiveId)
|
{
|
try {
|
//解密
|
$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
|
} catch (Exception $e) {
|
return [ErrorCode::$DecryptAESError, null];
|
}
|
try {
|
//删除PKCS#7填充
|
$pkc_encoder = new PKCS7Encoder;
|
$result = $pkc_encoder->decode($decrypted);
|
if (strlen($result) < 16) {
|
return [];
|
}
|
//拆分
|
$content = substr($result, 16, strlen($result));
|
$len_list = unpack('N', substr($content, 0, 4));
|
$xml_len = $len_list[1];
|
$xml_content = substr($content, 4, $xml_len);
|
$from_receiveId = substr($content, $xml_len + 4);
|
} catch (Exception $e) {
|
print $e;
|
return [ErrorCode::$IllegalBuffer, null];
|
}
|
if ($from_receiveId != $receiveId) {
|
return [ErrorCode::$ValidateCorpidError, null];
|
}
|
return [0, $xml_content];
|
}
|
/**
|
* 生成随机字符串
|
*
|
* @return string
|
*/
|
private function getRandomStr()
|
{
|
$str = '';
|
$str_pol = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyl';
|
$max = strlen($str_pol) - 1;
|
for ($i = 0; $i < 16; $i++) {
|
$str .= $str_pol[mt_rand(0, $max)];
|
}
|
return $str;
|
}
|
}
|
?>
|
