Last updated: Fri, 14 Aug 2009

openssl_pkey_get_public

(PHP 4 >= 4.2.0, PHP 5)

openssl_pkey_get_public — Extrait une clé privée d'un certificat, et la prépare

Description

resource openssl_pkey_get_public ( mixed $certificate )

openssl_get_publickey() extrait la clé publique du certificat certificate et la prépare pour être utilisée par les autres fonctions.

Liste de paramètres

certificate

certificate peut avoir l'une des valeurs suivantes :

Une ressource d'un certificat X.509.
Une chaîne au format file://path/to/file.pem. Le fichier ainsi désigné doit contenir une clé privée ou un certificat au format PEM (éventuellement les deux).
Une clé privée au format PEM.

Valeurs de retour

Retourne une ressource positive, représentant une clé en cas de succès, ou FALSE si une erreur survient.

openssl_pkey_new

openssl_pkey_get_private

Last updated: Fri, 14 Aug 2009

add a note User Contributed Notes
openssl_pkey_get_public

thelen dot shar at gmail dot com
25-Jan-2009 08:08


Found it difficult to get my head around this due to lack of documentation.



But the process I followed for all this was:

Generate private key:

openssl genrsa -des3 -out private.pem 1024



Generate public key:

openssl rsa -in private.pem -out public.pem -outform PEM -pubout



Then in PHP:

$passphrase = 'somestring';

$key_private = openssl_get_privatekey(file_get_contents('private.pem'), $passphrase);

$key_public = openssl_get_publickey(file_get_contents('public.pem'));



Probably not the best way of doing it, but a lot simpler than the other examples on the site. I was having trouble getting the pubkey, it wasn't exactly specified very well, and I had made a mistake in generating it so it wasn't working for that reason as well.

VaD
06-Jun-2008 05:36


Small error in this code:



$pub_key = openssl_pkey_get_public(file_get_contents('./cert.crt'));

$keyData = openssl_pkey_get_details($pub_key);

file_put_contents('./key.pub', $keyData['key']);

07-May-2007 07:40


you can get (and save to file) public key using openssl_pkey_get_details(resource $key ) function:



<?php

$pub_key = openssl_pkey_get_public(file_get_contents('./cert.crt'));

$keyData = openssl_pkey_get_details($pub_key);

fule_put_contents('./key.pub', $keyData['key']);

?>

dankybastard at hotmail
09-Feb-2005 04:52


You must also use the string representation of the certificate to get the public key resource:



$dn = array();  // use defaults

$res_privkey = openssl_pkey_new();

$res_csr = openssl_csr_new($dn, $res_privkey);

$res_cert = openssl_csr_sign($res_csr, null, $res_privkey, $ndays);



openssl_x509_export($res_cert, $str_cert);



$res_pubkey = openssl_pkey_get_public($str_cert);

09-Aug-2004 06:44


This documentation notes it can take a PEM-formatted private key, but as per bug #25614, this is not possible in any form. The function simply returns a FALSE.



The only thing you can get public keys out of are X.509 certificates.



Furthermore, there is NO way to export a public key into a PEM-encoded form.

add a note

openssl_pkey_new

openssl_pkey_get_private

Last updated: Fri, 14 Aug 2009