(PHP 5 >= 5.6.0, PHP 7)
openssl_spki_export — Exports a valid PEM formatted public key signed public key and challenge
openssl_spki_export ( string &$spkac ) : string
Exports PEM formatted public key from encoded signed public key and challenge
spkac
Expects a valid signed public key and challenge
Returns the associated PEM formatted public key or NULL on failure.
Emits an E_WARNING level error if an invalid argument is passed via the spkac parameter.
Example #1 openssl_spki_export() example
Extracts the associated PEM formatted public key or NULL on failure.
<?php
$pkey = openssl_pkey_new('secret password');
$spkac = openssl_spki_new($pkey, 'challenge string');
$pubKey = openssl_spki_export(preg_replace('/SPKAC=/', '', $spkac));
if ($pubKey) {
echo $pubKey;
}
?> Example #2 openssl_spki_export() example from <keygen>
Extracts the associated PEM formatted public key issued from the <keygen> element
<?php
$spkac = openssl_spki_export(preg_replace('/SPKAC=/', '', $_POST['spkac']));
if ($spkac != NULL) {
echo $spkac;
} else {
echo "Extraction of pub key failed";
}
?>
<keygen name="spkac" challenge="challenge string" keytype="RSA">
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https://www.php.net/manual/en/function.openssl-spki-export.php