OpenSSL Functions
PHP Manual

openssl_spki_export_challenge

Exports the challenge associated with a signed public key and challenge

Description

stringfalse openssl_spki_export_challenge(string $spki)

Exports challenge from encoded signed public key and challenge

Parameters

spki

Expects a valid signed public key and challenge

Return Values

Returns the associated challenge string 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_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">

See Also

  • openssl_spki_new
  • openssl_spki_verify
  • openssl_spki_export
  • openssl_get_md_methods
  • openssl_csr_new
  • openssl_csr_sign