Encrypt large data using public key .ASC in php

Question

I have a public key with extension .asc that I need to use to encrypt data and to send it in a plain text file. I am trying to accomplish this in a windows machine using php. Any ideas? Thanks,

In PECL, there is a gnupg extension http://www.php.net/manual/en/book.gnupg.php — gen_Eric, Jan 21 '14 at 18:36
rocket-hazmat: I don't have any problem configuring it in linux. Windows is what being a pain... I was hoping to find the dll I can refer to within the INI file but I don't see any out there — Voltaire, Jan 21 '14 at 19:50

score 1 · Accepted Answer · answered Jan 21 '14 at 19:26

1

Make sure you installed the gnupg extension for PHP.

$gpg = new gnupg();
$publicData = file_get_contents('public.asc');
$publicKey = $gpg->import($publicData);
$gpg->addencryptkey($publicKey['fingerprint']);
echo $gpg->encrypt('Data to encrypt');

Instead of encrypting a constant, replace by the file contents, and store the encrypted message wherever you want.

answered Jan 21 '14 at 19:26

Jens Erat

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gnupg extension isn't that straight forward in windows. I tried installing it using PECL but getting an error "ERROR: The DSP gnupg.dsp does not exist." I may have to compile it from the source ... – Voltaire Jan 21 '14 at 19:56
You might be happier just calling the binary. Make sure to put the public key into the web servers GnuPG directory, and just call `gpg.exe -r DEADBEEF -d file-to-encrypt >encrypted-file.asc`. You might have to use GnuPG's full path. Or simply use a Linux box as web server... – Jens Erat Jan 21 '14 at 23:10
Not a bad idea. Thanks Jens Erat. – Voltaire Feb 04 '14 at 19:38

score 0 · Answer 2 · answered Nov 16 '22 at 09:47

first create new folder owner by www-data

mkdir /var/www/.gnupg
sudo chown -R www-data:www-data  /var/www/.gnupg

second try follow php code:

    putenv("GNUPGHOME=/var/www/.gnupg");
    $gpg = new gnupg();
    $publicData = file_get_contents('/var/www/html/web/resources/keys/public.asc');
    $privateData = file_get_contents('/var/www/html/web/resources/keys/SECRET.asc');
    $publicKey = $gpg->import($publicData);
    $gpg->addencryptkey($publicKey['fingerprint']);
    $encrypt = ($gpg->encrypt('Data to encrypt'));
    echo $encrypt;

Encrypt large data using public key .ASC in php

2 Answers2