There is a PHP extension port of the gnupg PGP library. However, I'm having a hard time finding examples that explain how to use the library.
How do you properly create keys for application users, and then use them to encrypt/decrypt text using the GnuPG library?
See this URL it is very help full to you. Download example and try it.
https://github.com/singpolyma/openpgp-php
Or Try it:-
You can download lib/openpgp.php and lib/openpgp_crypt_rsa.php files in above the URL.
examples/keygen.php
<?php
require dirname(__FILE__).'/../lib/openpgp.php';
require dirname(__FILE__).'/../lib/openpgp_crypt_rsa.php';
$rsa = new Crypt_RSA();
$k = $rsa->createKey(512);
$rsa->loadKey($k['privatekey']);
$nkey = new OpenPGP_SecretKeyPacket(array(
'n' => $rsa->modulus->toBytes(),
'e' => $rsa->publicExponent->toBytes(),
'd' => $rsa->exponent->toBytes(),
'p' => $rsa->primes[1]->toBytes(),
'q' => $rsa->primes[2]->toBytes(),
'u' => $rsa->coefficients[2]->toBytes()
));
$uid = new OpenPGP_UserIDPacket('Test <[email protected]>');
$wkey = new OpenPGP_Crypt_RSA($nkey);
$m = $wkey->sign_key_userid(array($nkey, $uid));
print $m->to_bytes();
examples/sign.php
<?php
require dirname(__FILE__).'/../lib/openpgp.php';
require dirname(__FILE__).'/../lib/openpgp_crypt_rsa.php';
/* Parse secret key from STDIN, the key must not be password protected */
$wkey = OpenPGP_Message::parse(file_get_contents('php://stdin'));
$wkey = $wkey[0];
/* Create a new literal data packet */
$data = new OpenPGP_LiteralDataPacket('This is text.', array('format' => 'u', 'filename' => 'stuff.txt'));
/* Create a signer from the key */
$sign = new OpenPGP_Crypt_RSA($wkey);
/* The message is the signed data packet */
$m = $sign->sign($data);
/* Output the raw message bytes to STDOUT */
echo $m->to_bytes();
?>
examples/verify.php
<?php
require dirname(__FILE__).'/../lib/openpgp.php';
require dirname(__FILE__).'/../lib/openpgp_crypt_rsa.php';
/* Parse public key from STDIN */
$wkey = OpenPGP_Message::parse(file_get_contents('php://stdin'));
$wkey = $wkey[0];
/* Parse signed message from file named "t" */
$m = OpenPGP_Message::parse(file_get_contents('t'));
/* Create a verifier for the key */
$verify = new OpenPGP_Crypt_RSA($wkey);
/* Dump verification information to STDOUT */
var_dump($verify->verify($m));
?>