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Description

resource openssl_pkey_get_public ( mixed certificate )

Returns a positive key resource identifier on success, or FALSE on error.

openssl_get_publickey() extracts the public key from certificate and prepares it for use by other functions. certificate can be one of the following:

an X.509 certificate resource
a string having the format file://path/to/file.pem. The named file must contain a PEM encoded certificate/private key (it may contain both).
A PEM formatted private key.

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openssl_pkey_get_public

07-May-2007 12:40


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 08:52


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 11:44


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.

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