PHP通过加密计算出短信验证码，无需缓存验证码

通过加密计算出短信验证码，无需缓存验证码

 

<?php

class XixiOtp {
    private $iKeeptime; // 验证码有效期
    private $sKey; // 加密用的密钥
    private $p1Len = 1; // 验证码前缀长度(建议1~2)
    private $p2Len = 5; // 验证码后缀长度(建议3~7)
    public function __construct($sKey, $iKeeptime = 600) {
        $this->sKey = $sKey;
        $this->iKeeptime = $iKeeptime;
    }
    public function setAccount($sAccount) {
        // 设置要生成的账号
        $this->sAccount = $sAccount;
    }
    private function numPad($n, $len) {
        return str_pad($n, $len, '0', STR_PAD_LEFT);
    }
    private function getCrc32($str) {
        return sprintf('%u', crc32($str));
    }
    private function getP2($iT1, $iP1) {
        // 通过时间和验证码前缀来计算验证码的后缀
        $iT2 = intval(($iT1 - $iP1 * $this->iKeeptime / pow(10, $this->p1Len)) / $this->iKeeptime);
        $sP1 = $this->numPad($iP1, $this->p1Len);
        $arr = array($this->sAccount, $iT2, $sP1, $this->sKey);
        $crc = $this->getCrc32(implode(',', $arr));
        $iP2 = $crc % pow(10, $this->p2Len);
        return $this->numPad($iP2, $this->p2Len);
    }
    public function getCode() {
        // 取得Otp验证码
        $iT1 = time();
        $m = $iT1 % $this->iKeeptime;
        $iP1 = intval($m * pow(10, $this->p1Len) / $this->iKeeptime);
        $iP2 = $this->getP2($iT1, $iP1);
        return $this->numPad($iP1, $this->p1Len) . $iP2;
    }
    public function verify($code) {
        // 校验Otp验证码是否有效
        $iT1 = time();
        $sP1 = substr($code, 0, $this->p1Len);
        $sP2 = substr($code, $this->p1Len);
        return $sP2 === $this->getP2($iT1, intval($sP1));
    }
    public static function test() {
        // 测试代码
        $iKeeptime = 600;
        $otp = new XixiOtp('feieryun.cn', $iKeeptime);
        $otp->setAccount('309385018@qq.com');
        $sCode = $otp->getCode();
        echo($sCode . "\r\n");
        for ($i = 0; $i <= $iKeeptime; $i++) {
            echo $i . ':';
            var_dump($otp->verify($sCode));
            sleep(1);
        }
    }
}
XixiOtp::test();

 

可用于发邮件或短信验证码，无需创建表存储验证码