weworkapi_php/callback/pkcs7Encoder.php at master · EternalSuno/weworkapi_php · GitHub

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<?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

if (function_exists('openssl_encrypt')) {

$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);

} else {

$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->key, base64_decode($text), MCRYPT_MODE_CBC, $this->iv);

}

return array(ErrorCode::$OK, $encrypted);

} catch (Exception $e) {

print $e;

return array(MyErrorCode::$EncryptAESError, null);

}

/**

* 解密

* @param $encrypted

* @param $receiveId

* @return array

public function decrypt($encrypted, $receiveId)

{

try {

//解密

if (function_exists('openssl_decrypt')) {

$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);

} else {

$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->key, base64_decode($encrypted), MCRYPT_MODE_CBC, $this->iv);

}

} catch (Exception $e) {

return array(ErrorCode::$DecryptAESError, null);

}

try {

//删除PKCS#7填充

$pkc_encoder = new PKCS7Encoder;

$result = $pkc_encoder->decode($decrypted);

if (strlen($result) < 16) {

return array();

}

//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 array(ErrorCode::$IllegalBuffer, null);

}

if ($from_receiveId != $receiveId) {

return array(ErrorCode::$ValidateCorpidError, null);

}

return array(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;

}

weworkapi_php/callback/pkcs7Encoder.php at master · EternalSuno/weworkapi_php · GitHub

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