openssl_spki_verify

(PHP 5 >= 5.6.0, PHP 7, PHP 8)

openssl_spki_verify — Verifies a signed public key and challenge

Beschreibung

openssl_spki_verify(string $spki): bool

Validates the supplied signed public key and challenge

Parameter-Liste

spki: Expects a valid signed public key and challenge

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

Fehler/Exceptions

Emits an E_WARNING level error if an invalid argument is passed via the spki parameter.

Beispiele

Beispiel #1 openssl_spki_verify() example

Validates an existing signed public key and challenge

<?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";
}
?>

Beispiel #2 openssl_spki_verify() example from <keygen>

Validates an existing signed public key and challenge issued from the <keygen> element

<?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">

Siehe auch

openssl_spki_new() - Generate a new signed public key and challenge
openssl_spki_export_challenge() - Exports the challenge associated with a signed public key and challenge
openssl_spki_export() - Exports a valid PEM formatted public key signed public key and challenge
openssl_get_md_methods() - Gets available digest methods
openssl_csr_new() - Erzeugt einen CSR
openssl_csr_sign() - Signiert einen CSR mit einem anderen Zertifikat (oder sich selbst) und generiert ein Zertifikat

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User Contributed Notes 2 notes

down

carloshlfzanon at gmail dot com ¶

7 years ago

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>

down

neat at neato dot com ¶

4 years ago

The challenge is not how to very a "trick". It is used as a partial non-repudiation method.

The idea was the challenge could be extracted from the base64 encoded ASN.1 PKCS#1 bits provided from the 'keygen' element.

The SPKAC is a form of CSR which if the right about of information such as the commonName, emailAddress, countryName, stateOrProvinceName, localityName et al., a signed x509 could generated and provided to the requestor.

This would then be installed in the browser and if the webserver was configured to accept client x509 certificates, it would be used in lieu of a password for authentication.

A recommendation was to use the 'challenge' as a form of non-repudiation in the event someone else was on your keyboard. If the application required it could prompt you for the challenge and compare it to a hashed version it stored upon the initial SPKAC process.

Hope that helps clear it up.

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