openssl_spki_verify()

(PHP 5 >= 5.6.0, PHP 7)

验证签名公钥和挑战。

说明

openssl_spki_verify(string &$spkac): string

验证所提供的签名公钥和挑战。

参数

$spkac: 期望一个有效的签名公钥和挑战。

返回值

成功，返回true,失败返回false.

错误／异常

如果$spkac参数不是一个可用的参数，将会抛出一个E_WARNING等级的错误。

范例

openssl_spki_verify()范例：

验证现有签名公钥和挑战

<?php
$pkey = openssl_pkey_new('secret password');
$spkac = openssl_spki_new($pkey, 'challenge string');
if (openssl_spki_verify(preg_replace('/SPKAC=/', '', $spkac))) {
    echo $spkac;
} else {
    echo "SPKAC validation failed";
}
?>

openssl_spki_verify() example from <keygen>

通过<keygen>元素验证现有签名公钥和挑战

<?php
if (openssl_spki_verify(preg_replace('/SPKAC=/', '', $_POST['spkac']))) {
    echo $spkac;
} else {
    echo "SPKAC validation failed";
}
?>
<keygen name="spkac" challenge="challenge string" keytype="RSA">

参见

openssl_spki_new()生成一个新的签名公钥和挑战
openssl_spki_export_challenge()导出与签名公钥和挑战相关的挑战字符串
openssl_spki_export()通过签名公钥和挑战导出一个可用的PEM格式的公钥
openssl_md_method()
openssl_csr_new()生成一个 CSR
openssl_csr_sign()用另一个证书签署 CSR(或者本身)并且生成一个证书

This openssl_spki_* funcs are very usefull to use with <keygen/> tag in html5.
Example:
<?php
session_start();
// form submitted... (?)
if(isset($_POST['security']))
{
  // If true, the send from <keygen/> is valid and you can
  // test the challenge too
  if(openssl_spki_verify($_POST['security']))
  {
    // Gets challenge string
    $challenge = openssl_spki_export_challenge($_POST['security']);
    // If true... you are not trying to trick it.
    // If user open 2 windows to prevent data lost from a "mistake" or him just press "back" button
    // and re-send last data... you can handle it using something like it.
    if($challenge == $_SESSION['lastForm'])
    {
      echo 'Ok, this one is valid.', '<br><br>';
    }
    else
    {
      echo 'Nice try... nice try...', '<br><br>'; 
    }
  }
}
// If you open two window, the challenge won't match!
$_SESSION['lastForm'] = hash('md5', microtime(true));
?>
<!DOCTYPE html>
<html>
<body>
<form action="/index.php" method="post">
 Encryption: <keygen name="security" keytype="rsa" challenge="<?php echo $_SESSION['lastForm']; ?>"/>
 <input type="submit">
</form>
</body>
</html>