[edit] Last updated: Fri, 18 May 2012

openssl_pkey_new

(PHP 4 >= 4.2.0, PHP 5)

openssl_pkey_new — Generates a new private key

Description

resource openssl_pkey_new ([ array $configargs ] )

openssl_pkey_new() generates a new private and public key pair. The public component of the key can be obtained using openssl_pkey_get_public().

Note: You need to have a valid openssl.cnf installed for this function to operate correctly. See the notes under the installation section for more information.

Parameters

configargs: You can finetune the key generation (such as specifying the number of bits) using configargs. See openssl_csr_new() for more information about configargs.

Return Values

Returns a resource identifier for the pkey on success, or FALSE on error.

openssl_private_decrypt

openssl_pkey_get_public

[edit] Last updated: Fri, 18 May 2012

add a note User Contributed Notes openssl_pkey_new

jthijssen at notloxic dot nl 11-Feb-2011 06:17


If you want to change the default private key size (1024) too something else you can use the following code:

 

<?php 

$config = array('private_key_bits' => 512);

$privKey = openssl_pkey_new($config);



?>



Mind though that the minimum number of bits is 384. Any lower will trigger an error.

Brad 02-Apr-2008 12:17


It's easier than all that, if you just want the keys:



<?php

// Create the keypair

$res=openssl_pkey_new();



// Get private key

openssl_pkey_export($res, $privkey);



// Get public key

$pubkey=openssl_pkey_get_details($res);

$pubkey=$pubkey["key"];

?>

NOSPAM dot alchaemist at hiperlinux dot com dot ar 30-May-2004 12:17


As you probably found, getting the public key is not as direct as you might think with this documentation.



You can easily get into messages like:



Warning: openssl_pkey_get_public(): Don't know how to get public key from this private key (the documentation lied) in D:\www\keys.php on line 4



The correct steps to get the whole thing seem to be these:



<?

$dn = array("countryName" => 'XX', "stateOrProvinceName" => 'State', "localityName" => 'SomewhereCity', "organizationName" => 'MySelf', "organizationalUnitName" => 'Whatever', "commonName" => 'mySelf', "emailAddress" => 'user@domain.com');

$privkeypass = '1234';

$numberofdays = 365;



$privkey = openssl_pkey_new();

$csr = openssl_csr_new($dn, $privkey);

$sscert = openssl_csr_sign($csr, null, $privkey, $numberofdays);

openssl_x509_export($sscert, $publickey);

openssl_pkey_export($privkey, $privatekey, $privkeypass);

openssl_csr_export($csr, $csrStr);



echo $privatekey; // Will hold the exported PriKey

echo $publickey;  // Will hold the exported PubKey

echo $csrStr;     // Will hold the exported Certificate

?>



Now all you need to do is to make some research on each individual function.

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