How do you use the PHP OpenPGP library?

StackOverflow https://stackoverflow.com/questions/12411738

  •  01-07-2021
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Question

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?

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Solution

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 <test@example.com>');

$wkey = new OpenPGP_Crypt_RSA($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));

?>

OTHER TIPS

They are very good examples based on PHP extension port has you have requested and we would take a look at some examples

Using GnuPG with PHP -- Full Tutorials

Example

Getting Key Information 

putenv('GNUPGHOME=/home/sender/.gnupg');

// create new GnuPG object
$gpg = new gnupg();

// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 

// get list of keys containing string 'example'
try {
  $keys = $gpg->keyinfo('example');
  print_r($info);
} catch (Exception $e) {
  echo 'ERROR: ' . $e->getMessage();
}

Encrypt a Simple Mail 

// set path to keyring directory
// set path to keyring directory
putenv('GNUPGHOME=/home/sender/.gnupg');

// create new GnuPG object
$gpg = new gnupg();

// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 

// recipient's email address
$recipient = 'dgar@example.org';

// plaintext message
$plaintext = 
"Dear Dave,\n
  The answer is 42.\n
John";

// find key matching email address
// encrypt plaintext message
// display and also write to file
try {
  $gpg->addencryptkey($recipient);
  $ciphertext = $gpg->encrypt($plaintext);
  echo '<pre>' . $ciphertext . '</pre>';
  file_put_contents('/tmp/ciphertext.gpg', $ciphertext);
} catch (Exception $e) {
  die('ERROR: ' . $e->getMessage());
}

Decryption The Mail 

// set path to keyring directory
putenv('GNUPGHOME=/home/recipient/.gnupg');

// create new GnuPG object
$gpg = new gnupg();

// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 

// recipient's email address
$recipient = 'dgar@example.org';

// ciphertext message
$ciphertext = file_get_contents('/tmp/ciphertext.gpg');

// register secret key by providing passphrase
// decrypt ciphertext with secret key
// display plaintext message
try {
  $gpg->adddecryptkey($recipient, 'guessme');
  $plaintext = $gpg->decrypt($ciphertext);
  echo '<pre>' . $plaintext . '</pre>';
} catch (Exception $e) {
  die('ERROR: ' . $e->getMessage());
}

You should also look at the Example

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