openssl_pkey_new

(PHP 4 >= 4.2.0, PHP 5)

openssl_pkey_new — Generates a new private key

说明

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: 必须安装有效的 openssl.cnf 以保证此函数正确运行。参考有关安装的说明以获得更多信息。

参数

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.

返回值

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

用户评论:

[#1] scott at brynen dot com [2015-02-24 21:36:42]

If you try and generate a new key using openssl_pkey_new(), and need to specify the size of the key, the key MUST be type-bound to integer

// works
$keysize = 1024;
$ssl = openssl_pkey_new (array('private_key_bits' => $keysize));

// fails
$keysize = "1024";
$ssl = openssl_pkey_new (array('private_key_bits' => $keysize));

// works (force to int)
$keysize = "1024";
$ssl = openssl_pkey_new (array('private_key_bits' => (int)$keysize));

[#2] dirt at awoms dot com [2013-03-26 20:52:09]

Working example:

$config = array(
    "digest_alg" => "sha512",
    "private_key_bits" => 4096,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
);

// Create the private and public key
$res = openssl_pkey_new($config);

// Extract the private key from $res to $privKey
openssl_pkey_export($res, $privKey);

// Extract the public key from $res to $pubKey
$pubKey = openssl_pkey_get_details($res);
$pubKey = $pubKey["key"];

$data = 'plaintext data goes here';

// Encrypt the data to $encrypted using the public key
openssl_public_encrypt($data, $encrypted, $pubKey);

// Decrypt the data using the private key and store the results in $decrypted
openssl_private_decrypt($encrypted, $decrypted, $privKey);

echo $decrypted;

[#3] zelnaga at gmail dot com [2012-06-07 17:21:16]

Getting the public key corresponding to a particular private key, through the methods provided for by OpenSSL, is a bit cumbersome. An easier way to do it is to use phpseclib, a pure PHP RSA implementation:

<?php include('Crypt/RSA.php'); $rsa = new Crypt_RSA(); $rsa->loadKey('...'); $privatekey = $rsa->getPrivateKey(); $publickey = $rsa->getPublicKey(); ?>

Doesn't require any extensions be installed. It'll use bcmath or gmp if they're available, for speed, but doesn't even require those.

[#4] jthijssen at notloxic dot nl [2011-02-11 06:17:53]

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.

[#5] Brad [2008-04-02 12:17:50]

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"]; ?>

[#6] NOSPAM dot alchaemist at hiperlinux dot com dot ar [2004-05-30 00:17:25]

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:

<?php $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.