php man page for openssl_spki_export_challenge

OPENSSL_SPKI_EXPORT_CHALLENGE(3)					 1					  OPENSSL_SPKI_EXPORT_CHALLENGE(3)

openssl_spki_export_challenge - Exports the challenge assoicated with a signed public key and challenge

SYNOPSIS
       string openssl_spki_export_challenge (string  &$spkac)

DESCRIPTION
	Exports challenge from encoded signed public key and challenge

PARAMETERS
	      o $spkac
		- Expects a valid signed public key and challenge

RETURN VALUES
	Returns the associated challenge string or NULL on failure.

ERRORS
/EXCEPTIONS
	Emits an E_WARNING level error if an invalid argument is passed via the $spkac parameter.

EXAMPLES
       Example #1

	      openssl_spki_export_challenge(3) 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(3) 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(3), openssl_spki_verify(3), openssl_spki_export(3), openssl_md_method(3), openssl_csr_new(3), openssl_csr_sign(3).

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