openssl_spki_export_challenge
openssl_spki_new
OpenSSL Functions
PHP Manual

# openssl_spki_export

(PHP 5 >= 5.6.0)

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

### Description

string openssl_spki_export ( string `&$spkac` )

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

### Parameters

`spkac`

  Expects a valid signed public key and challenge

### Return Values

Returns the associated PEM formatted public key 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() 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() - Generate a new signed public key and challenge
- openssl_spki_verify() - Verifies a signed public key and challenge
- openssl_spki_export_challenge() - Exports the challenge assoicated with a signed public key and challenge
- openssl_md_method()
- openssl_csr_new() - Generates a CSR
- openssl_csr_sign() - Sign a CSR with another certificate (or itself) and generate a certificate

openssl_spki_export_challenge
openssl_spki_new
OpenSSL Functions
PHP Manual