(PHP 5 >= 5.6.0, PHP 7, PHP 8)
openssl_spki_export_challenge — Exports the challenge associated with a signed public key and challenge
$spki
): string|falseExports challenge from encoded signed public key and challenge
spki
Expects a valid signed public key and challenge
Returns the associated challenge string or false
on failure.
Emits an E_WARNING
level error if an invalid argument
is passed via the spki
parameter.
Example #1 openssl_spki_export_challenge() example
Extracts the associated challenge string or NULL on failure.
<?php$pkey = openssl_pkey_new('secret password');$spkac = openssl_spki_new($pkey, 'challenge string');$challenge = openssl_spki_export_challenge(preg_replace('/SPKAC=/', '', $spkac));?>
Example #2 openssl_spki_export_challenge() example from <keygen>
Extracts the associated challenge string issued from the <keygen> element
<?php$challenge = openssl_spki_export_challenge(preg_replace('/SPKAC=/', '', $_POST['spkac']));?><keygen name="spkac" challenge="challenge string" keytype="RSA">