PHP Manual
OpenSSL Functions
Exports the challenge associated with a signed public key and challenge

openssl_spki_export_challenge

(PHP 5 >= 5.6.0, PHP 7)

openssl_spki_export_challenge — Exports the challenge associated with a signed public key and challenge

Description

openssl_spki_export_challenge ( string &$spkac ) : string

Exports challenge from encoded signed public key and challenge

Parameters

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() 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">

openssl_spki_new() - Generate a new signed public key and challenge
openssl_spki_verify() - Verifies a signed public key and challenge
openssl_spki_export() - Exports a valid PEM formatted public key signed public key and challenge
openssl_get_md_methods() - Gets available digest methods
openssl_csr_new() - Generates a CSR
openssl_csr_sign() - Sign a CSR with another certificate (or itself) and generate a certificate

Php/docs/function.openssl-spki-export-challenge

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