154 lines
3.8 KiB
PHP
154 lines
3.8 KiB
PHP
<?php
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include_once "errorCode.php";
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include_once "sha1.php";
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/**
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* PKCS7Encoder class
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*
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* 提供基于PKCS7算法的加解密接口.
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*/
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class PKCS7Encoder
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{
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public static $block_size = 32;
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/**
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* 对需要加密的明文进行填充补位
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* @param $text 需要进行填充补位操作的明文
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* @return 补齐明文字符串
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*/
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function encode($text)
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{
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$block_size = PKCS7Encoder::$block_size;
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$text_length = strlen($text);
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//计算需要填充的位数
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$amount_to_pad = PKCS7Encoder::$block_size - ($text_length % PKCS7Encoder::$block_size);
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if ($amount_to_pad == 0) {
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$amount_to_pad = PKCS7Encoder::block_size;
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}
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//获得补位所用的字符
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$pad_chr = chr($amount_to_pad);
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$tmp = "";
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for ($index = 0; $index < $amount_to_pad; $index++) {
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$tmp .= $pad_chr;
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}
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return $text . $tmp;
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}
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/**
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* 对解密后的明文进行补位删除
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* @param decrypted 解密后的明文
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* @return 删除填充补位后的明文
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*/
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function decode($text)
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{
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$pad = ord(substr($text, -1));
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if ($pad < 1 || $pad > PKCS7Encoder::$block_size) {
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$pad = 0;
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}
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return substr($text, 0, (strlen($text) - $pad));
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}
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}
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/**
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* Prpcrypt class
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*
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* 提供接收和推送给公众平台消息的加解密接口.
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*/
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class Prpcrypt
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{
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public $key = null;
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public $iv = null;
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/**
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* Prpcrypt constructor.
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* @param $k
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*/
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public function __construct($k)
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{
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$this->key = base64_decode($k . '=');
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$this->iv = substr($this->key, 0, 16);
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}
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/**
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* 加密
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*
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* @param $text
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* @param $receiveId
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* @return array
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*/
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public function encrypt($text, $receiveId)
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{
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try {
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//拼接
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$text = $this->getRandomStr() . pack('N', strlen($text)) . $text . $receiveId;
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//添加PKCS#7填充
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$pkc_encoder = new PKCS7Encoder;
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$text = $pkc_encoder->encode($text);
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//加密
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$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
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return [ErrorCode::$OK, $encrypted];
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} catch (Exception $e) {
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print $e;
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return [MyErrorCode::$EncryptAESError, null];
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}
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}
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/**
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* 解密
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*
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* @param $encrypted
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* @param $receiveId
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* @return array
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*/
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public function decrypt($encrypted, $receiveId)
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{
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try {
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//解密
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$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $this->iv);
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} catch (Exception $e) {
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return [ErrorCode::$DecryptAESError, null];
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}
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try {
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//删除PKCS#7填充
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$pkc_encoder = new PKCS7Encoder;
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$result = $pkc_encoder->decode($decrypted);
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if (strlen($result) < 16) {
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return [];
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}
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//拆分
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$content = substr($result, 16, strlen($result));
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$len_list = unpack('N', substr($content, 0, 4));
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$json_len = $len_list[1];
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$json_content = substr($content, 4, $json_len);
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$from_receiveId = substr($content, $json_len + 4);
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} catch (Exception $e) {
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print $e;
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return [ErrorCode::$IllegalBuffer, null];
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}
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if ($from_receiveId != $receiveId) {
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return [ErrorCode::$ValidateCorpidError, null];
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}
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return [0, $json_content];
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}
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/**
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* 生成随机字符串
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*
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* @return string
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*/
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private function getRandomStr()
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{
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$str = '';
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$str_pol = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyl';
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$max = strlen($str_pol) - 1;
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for ($i = 0; $i < 16; $i++) {
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$str .= $str_pol[mt_rand(0, $max)];
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}
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return $str;
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}
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}
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