Google Authenticator验证的php客户端

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计算代码如下
参考：用php计算Google Authenticator二次验证的验证码
https://www.529i.com/archives/611.html

新建GoogleAuthenticator.php

<?php
class PHPGangsta_GoogleAuthenticator
{
    protected $_codeLength = 6;

    public function createSecret($secretLength = 16)
    {
        $validChars = $this->_getBase32LookupTable();

        if ($secretLength < 16 || $secretLength > 128) {
            throw new Exception('Bad secret length');
        }
        $secret = '';
        $rnd = false;
        if (function_exists('random_bytes')) {
            $rnd = random_bytes($secretLength);
        } elseif (function_exists('mcrypt_create_iv')) {
            $rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM);
        } elseif (function_exists('openssl_random_pseudo_bytes')) {
            $rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong);
            if (!$cryptoStrong) {
                $rnd = false;
            }
        }
        if ($rnd !== false) {
            for ($i = 0; $i < $secretLength; ++$i) {
                $secret .= $validChars[ord($rnd[$i]) & 31];
            }
        } else {
            throw new Exception('No source of secure random');
        }

        return $secret;
    }
    public function getCode($secret, $timeSlice = null)
    {
        if ($timeSlice === null) {
            $timeSlice = floor(time() / 30);
        }

        $secretkey = $this->_base32Decode($secret);

        $time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice);

        $hm = hash_hmac('SHA1', $time, $secretkey, true);

        $offset = ord(substr($hm, -1)) & 0x0F;

        $hashpart = substr($hm, $offset, 4);

        $value = unpack('N', $hashpart);
        $value = $value[1];

        $value = $value & 0x7FFFFFFF;

        $modulo = pow(10, $this->_codeLength);

        return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT);
    }

    public function getQRCodeGoogleUrl($name, $secret, $title = null, $params = array())
    {
        $width = !empty($params['width']) && (int) $params['width'] > 0 ? (int) $params['width'] : 200;
        $height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 200;
        $level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'M';

        $urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.'');
        if (isset($title)) {
            $urlencoded .= urlencode('&issuer='.urlencode($title));
        }

        return 'https://chart.googleapis.com/chart?chs='.$width.'x'.$height.'&chld='.$level.'|0&cht=qr&chl='.$urlencoded.'';
    }

    public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null)
    {
        if ($currentTimeSlice === null) {
            $currentTimeSlice = floor(time() / 30);
        }

        if (strlen($code) != 6) {
            return false;
        }

        for ($i = -$discrepancy; $i <= $discrepancy; ++$i) {
            $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);
            if ($this->timingSafeEquals($calculatedCode, $code)) {
                return true;
            }
        }

        return false;
    }

    public function setCodeLength($length)
    {
        $this->_codeLength = $length;

        return $this;
    }

    protected function _base32Decode($secret)
    {
        if (empty($secret)) {
            return '';
        }

        $base32chars = $this->_getBase32LookupTable();
        $base32charsFlipped = array_flip($base32chars);

        $paddingCharCount = substr_count($secret, $base32chars[32]);
        $allowedValues = array(6, 4, 3, 1, 0);
        if (!in_array($paddingCharCount, $allowedValues)) {
            return false;
        }
        for ($i = 0; $i < 4; ++$i) {
            if ($paddingCharCount == $allowedValues[$i] &&
                substr($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) {
                return false;
            }
        }
        $secret = str_replace('=', '', $secret);
        $secret = str_split($secret);
        $binaryString = '';
        for ($i = 0; $i < count($secret); $i = $i + 8) {
            $x = '';
            if (!in_array($secret[$i], $base32chars)) {
                return false;
            }
            for ($j = 0; $j < 8; ++$j) {
                $x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
            }
            $eightBits = str_split($x, 8);
            for ($z = 0; $z < count($eightBits); ++$z) {
                $binaryString .= (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';
            }
        }

        return $binaryString;
    }

    protected function _getBase32LookupTable()
    {
        return array(
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', //  7
            'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15
            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23
            'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31
            '=',
        );
    }

    private function timingSafeEquals($safeString, $userString)
    {
        if (function_exists('hash_equals')) {
            return hash_equals($safeString, $userString);
        }
        $safeLen = strlen($safeString);
        $userLen = strlen($userString);

        if ($userLen != $safeLen) {
            return false;
        }

        $result = 0;

        for ($i = 0; $i < $userLen; ++$i) {
            $result |= (ord($safeString[$i]) ^ ord($userString[$i]));
        }

        return $result === 0;
    }
}

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<?php

class PHPGangsta_GoogleAuthenticator

{

protected $_codeLength = 6;

public function createSecret($secretLength = 16)

{

$validChars = $this->_getBase32LookupTable();

if ($secretLength < 16 || $secretLength > 128) {

throw new Exception('Bad secret length');

}

$secret = '';

$rnd = false;

if (function_exists('random_bytes')) {

$rnd = random_bytes($secretLength);

} elseif (function_exists('mcrypt_create_iv')) {

$rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM);

} elseif (function_exists('openssl_random_pseudo_bytes')) {

$rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong);

if (!$cryptoStrong) {

$rnd = false;

}

if ($rnd !== false) {

for ($i = 0; $i < $secretLength; ++$i) {

$secret .= $validChars[ord($rnd[$i]) & 31];

}

} else {

throw new Exception('No source of secure random');

}

return $secret;

}

public function getCode($secret, $timeSlice = null)

{

if ($timeSlice === null) {

$timeSlice = floor(time() / 30);

}

$secretkey = $this->_base32Decode($secret);

$time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice);

$hm = hash_hmac('SHA1', $time, $secretkey, true);

$offset = ord(substr($hm, -1)) & 0x0F;

$hashpart = substr($hm, $offset, 4);

$value = unpack('N', $hashpart);

$value = $value[1];

$value = $value & 0x7FFFFFFF;

$modulo = pow(10, $this->_codeLength);

return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT);

}

public function getQRCodeGoogleUrl($name, $secret, $title = null, $params = array())

{

$width = !empty($params['width']) && (int) $params['width'] > 0 ? (int) $params['width'] : 200;

$height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 200;

$level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'M';

$urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.'');

if (isset($title)) {

$urlencoded .= urlencode('&issuer='.urlencode($title));

}

return 'https://chart.googleapis.com/chart?chs='.$width.'x'.$height.'&chld='.$level.'|0&cht=qr&chl='.$urlencoded.'';

}

public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null)

{

if ($currentTimeSlice === null) {

$currentTimeSlice = floor(time() / 30);

}

if (strlen($code) != 6) {

return false;

}

for ($i = -$discrepancy; $i <= $discrepancy; ++$i) {

$calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);

if ($this->timingSafeEquals($calculatedCode, $code)) {

return true;

}

return false;

}

public function setCodeLength($length)

{

$this->_codeLength = $length;

return $this;

}

protected function _base32Decode($secret)

{

if (empty($secret)) {

return '';

}

$base32chars = $this->_getBase32LookupTable();

$base32charsFlipped = array_flip($base32chars);

$paddingCharCount = substr_count($secret, $base32chars[32]);

$allowedValues = array(6, 4, 3, 1, 0);

if (!in_array($paddingCharCount, $allowedValues)) {

return false;

}

for ($i = 0; $i < 4; ++$i) {

if ($paddingCharCount == $allowedValues[$i] &&

substr($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) {

return false;

}

$secret = str_replace('=', '', $secret);

$secret = str_split($secret);

$binaryString = '';

for ($i = 0; $i < count($secret); $i = $i + 8) {

$x = '';

if (!in_array($secret[$i], $base32chars)) {

return false;

}

for ($j = 0; $j < 8; ++$j) {

$x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);

}

$eightBits = str_split($x, 8);

for ($z = 0; $z < count($eightBits); ++$z) {

$binaryString .= (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';

}

return $binaryString;

}

protected function _getBase32LookupTable()

{

return array(

'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 7

'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15

'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23

'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31

'=',

);

}

private function timingSafeEquals($safeString, $userString)

{

if (function_exists('hash_equals')) {

return hash_equals($safeString, $userString);

}

$safeLen = strlen($safeString);

$userLen = strlen($userString);

if ($userLen != $safeLen) {

return false;

}

$result = 0;

for ($i = 0; $i < $userLen; ++$i) {

$result |= (ord($safeString[$i]) ^ ord($userString[$i]));

}

return $result === 0;

}

调用方法如下
新建index.php

<?php

//调用上面计算代码保存的文件
require_once './GoogleAuthenticator.php';
$ga = new PHPGangsta_GoogleAuthenticator();
//要计算的key
$secret = "ZKU7DAJX7S33ZCPM";
echo "Key: ".$secret."\n\n";
$oneCode = $ga->getCode($secret); //服务端计算"一次性验证码"
echo "验证码:".$oneCode."\n\n";

?>

<?php

//调用上面计算代码保存的文件

require_once './GoogleAuthenticator.php';

$ga = new PHPGangsta_GoogleAuthenticator();

//要计算的key

$secret = "ZKU7DAJX7S33ZCPM";

echo "Key: ".$secret."\n\n";

$oneCode = $ga->getCode($secret); //服务端计算"一次性验证码"

echo "验证码:".$oneCode."\n\n";

访问域名/index.php
完成。