openssl_spki_export_challenge

    (PHP 5 >= 5.6.0, PHP 7, PHP 8)

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

    Description

    openssl_spki_export_challenge(string $spki): string|false

    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">

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