OpenSSL Functions
PHP Manual

openssl_spki_export

Exports a valid PEM formatted public key signed public key and challenge

Description

stringfalse openssl_spki_export(string $spki)

Exports PEM formatted public key from encoded signed public key and challenge

Parameters

spki

Expects a valid signed public key and challenge

Return Values

Returns the associated PEM formatted public key or false on failure.

Errors/Exceptions

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

Examples

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">

See Also

  • openssl_spki_new
  • openssl_spki_verify
  • openssl_spki_export_challenge
  • openssl_get_md_methods
  • openssl_csr_new
  • openssl_csr_sign