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108 lines
3.2 KiB
PHP
Executable File
108 lines
3.2 KiB
PHP
Executable File
<?php
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namespace addons\kefu\library\WechatCrypto;
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use addons\kefu\library\WechatCrypto\ErrorCode;
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use addons\kefu\library\WechatCrypto\PKCS7Encoder;
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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 $key;
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function __construct($k)
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{
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$this->key = base64_decode($k . "=");
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}
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/**
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* 对明文进行加密
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* @param string $text 需要加密的明文
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* @return string 加密后的密文
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*/
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public function encrypt($text, $appid)
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{
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try {
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//获得16位随机字符串，填充到明文之前
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$random = $this->getRandomStr();
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$text = $random . pack("N", strlen($text)) . $text . $appid;
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$iv = substr($this->key, 0, 16);
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$pkc_encoder = new PKCS7Encoder;
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$text = $pkc_encoder->encode($text);
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$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
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//print(base64_encode($encrypted));
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//使用BASE64对加密后的字符串进行编码
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return [ErrorCode::$OK, base64_encode($encrypted)];
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} catch (Exception $e) {
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//print $e;
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return [ErrorCode::$EncryptAESError, null];
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}
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}
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/**
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* 随机生成16位字符串
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* @return string 生成的字符串
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*/
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function getRandomStr()
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{
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$str = "";
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$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
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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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* 对密文进行解密
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* @param string $encrypted 需要解密的密文
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* @return string 解密得到的明文
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*/
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public function decrypt($encrypted, $appid)
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{
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try {
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//使用BASE64对需要解密的字符串进行解码
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$ciphertext_dec = base64_decode($encrypted);
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$iv = substr($this->key, 0, 16);
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$decrypted = openssl_decrypt($ciphertext_dec, 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $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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//去除补位字符
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$pkc_encoder = new PKCS7Encoder;
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$result = $pkc_encoder->decode($decrypted);
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//去除16位随机字符串,网络字节序和AppId
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if (strlen($result) < 16) {
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return "";
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}
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$content = substr($result, 16, strlen($result));
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$len_list = unpack("N", substr($content, 0, 4));
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$xml_len = $len_list[1];
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$xml_content = substr($content, 4, $xml_len);
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$from_appid = substr($content, $xml_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_appid != $appid) {
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return [ErrorCode::$ValidateAppidError, null];
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}
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return [0, $xml_content];
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}
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} |