PHP解密支付宝小程序的加密数据，手机号等。

1.小程序端代码示例

my.getPhoneNumber({
    success: (res) => {
        let encryptedData = res.response;
        my.httpRequest({
            url: '你的后端服务端',
            data: encryptedData,
        });
    },
    fail: (res) => {
        console.log(res);
        console.log('getPhoneNumber_fail');
    },
});

2.PHP后端解密示例

 public static function decryptData($encryptedData, $key = '开发设置-接口内容加密方式-查看-字符串')
    {
        $encrys = json_decode($encryptedData, true);
        $encryptedData = $encrys['response'];
        $str = base64_decode($encryptedData);
        $screct_key = base64_decode($key);

        //设置全0的IV
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $iv = str_repeat("\0", $iv_size);

        $decrypt_str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_CBC, $iv);
        $decrypt_str = self::stripPKSC7Padding($decrypt_str);
        return $decrypt_str;
    }

  public static function stripPKSC7Padding($source)
    {
        $char = substr($source, -1);
        $num = ord($char);
        if ($num == 62) return $source;
        $source = substr($source, 0, -$num);
        return $source;
    }

3.解密返回

{"code":"10000","msg":"Success","mobile":"185xxxxx111"}