(PHP 5 >= 5.6.0, PHP 7)
openssl_spki_verify — Verifies a signed public key and challenge
openssl_spki_verify ( string &$spkac ) : string
Validates the supplied signed public key and challenge
spkac
Expects a valid signed public key and challenge
Returns a boolean on success or failure.
Emits an E_WARNING level error if an invalid argument is passed via the spkac parameter.
Example #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";
}
?> Example #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">
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https://www.php.net/manual/en/function.openssl-spki-verify.php