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<?php
// +----------------------------------------------------------------------
// | wechat-php-sdk
// +----------------------------------------------------------------------
// | 版权所有 2014~2017 广州楚才信息科技有限公司 [ http://www.cuci.cc ]
// +----------------------------------------------------------------------
// | 官方文档: https://www.kancloud.cn/zoujingli/wechat-php-sdk
// +----------------------------------------------------------------------
// | 开源协议 ( https://mit-license.org )
// +----------------------------------------------------------------------
// | github开源项目：https://github.com/zoujingli/wechat-php-sdk
// +----------------------------------------------------------------------
/**
* PKCS7算法 加解密
* @category WechatSDK
* @subpackage library
* @date 2016/06/28 11:59
*/
class PKCS7Encoder
{
public static $block_size = 32;
/**
* 对需要加密的明文进行填充补位
* @param string $text 需要进行填充补位操作的明文
* @return string 补齐明文字符串
*/
function encode($text)
{
$amount_to_pad = PKCS7Encoder::$block_size - (strlen($text) % PKCS7Encoder::$block_size);
if ($amount_to_pad == 0) {
$amount_to_pad = PKCS7Encoder::$block_size;
}
$pad_chr = chr($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 string $text 解密后的明文
* @return string 删除填充补位后的明文
*/
function decode($text)
{
$pad = ord(substr($text, -1));
if ($pad < 1 || $pad > PKCS7Encoder::$block_size) {
$pad = 0;
}
return substr($text, 0, (strlen($text) - $pad));
}
}
/**
* 接收和推送给公众平台消息的加解密
* @category WechatSDK
* @subpackage library
* @date 2016/06/28 11:59
*/
class Prpcrypt
{
public $key;
function __construct($k)
{
$this->key = base64_decode($k . "=");
}
/**
* 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 {
//获得16位随机字符串，填充到明文之前
$random = $this->getRandomStr();//"aaaabbbbccccdddd";
$text = $random . pack("N", strlen($text)) . $text . $appid;
$iv = substr($this->key, 0, 16);
$pkc_encoder = new PKCS7Encoder;
$text = $pkc_encoder->encode($text);
$encrypted = openssl_encrypt($text, 'AES-256-CBC', substr($this->key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
return array(ErrorCode::$OK, $encrypted);
} catch (Exception $e) {
return array(ErrorCode::$EncryptAESError, null);
}
}
/**
* 对密文进行解密
* @param string $encrypted 需要解密的密文
* @param string $appid 公众号APPID
* @return array
*/
public function decrypt($encrypted, $appid)
{
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 $e) {
return array(ErrorCode::$DecryptAESError, null);
}
try {
$pkc_encoder = new PKCS7Encoder;
$result = $pkc_encoder->decode($decrypted);
if (strlen($result) < 16) {
return array(ErrorCode::$DecryptAESError, null);
}
$content = substr($result, 16, strlen($result));
$len_list = unpack("N", substr($content, 0, 4));
$xml_len = $len_list[1];
$xml_content = substr($content, 4, $xml_len);
$from_appid = substr($content, $xml_len + 4);
return array(0, $xml_content, $from_appid);
} catch (Exception $e) {
return array(ErrorCode::$IllegalBuffer, null);
}
}
/**
* 随机生成16位字符串
* @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;
}
}
/**
* 仅用作类内部使用
* 不用于官方API接口的errCode码
* Class ErrorCode
*/
class ErrorCode
{
public static $OK = 0;
public static $ValidateSignatureError = 40001;
public static $ParseXmlError = 40002;
public static $ComputeSignatureError = 40003;
public static $IllegalAesKey = 40004;
public static $ValidateAppidError = 40005;
public static $EncryptAESError = 40006;
public static $DecryptAESError = 40007;
public static $IllegalBuffer = 40008;
public static $EncodeBase64Error = 40009;
public static $DecodeBase64Error = 40010;
public static $GenReturnXmlError = 40011;
public static $errCode = array(
'0' => '处理成功',
'40001' => '校验签名失败',
'40002' => '解析xml失败',
'40003' => '计算签名失败',
'40004' => '不合法的AESKey',
'40005' => '校验AppID失败',
'40006' => 'AES加密失败',
'40007' => 'AES解密失败',
'40008' => '公众平台发送的xml不合法',
'40009' => 'Base64编码失败',
'40010' => 'Base64解码失败',
'40011' => '公众帐号生成回包xml失败'
);
/**
* 获取错误消息内容
* @param string $err
* @return bool
*/
public static function getErrText($err)
{
if (isset(self::$errCode[$err])) {
return self::$errCode[$err];
}
return false;
}
}