(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