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17 years ago
To complete the examples below that use proc_open to encrypt a string using GPG, here is a decrypt function:



<?php

function gpg_decrypt($string, $secret) {

    $homedir = ''; // path to you gpg keyrings

    $tmp_file = '/tmp/gpg_tmp.asc' ; // tmp file to write to        

    file_put_contents($tmp_file, $string);



    $text = '';

    $error = '';

    $descriptorspec = array(

        0 => array("pipe", "r"),  // stdin

        1 => array("pipe", "w"),  // stdout

        2 => array("pipe", "w")   // stderr ?? instead of a file

        );

    $command = 'gpg --homedir ' . $homedir . ' --batch --no-verbose --passphrase-fd 0 -d ' . $tmp_file . ' ';

    $process = proc_open($command, $descriptorspec, $pipes);

    if (is_resource($process)) {

        fwrite($pipes[0], $secret);

        fclose($pipes[0]);

        while($s= fgets($pipes[1], 1024)) {

          // read from the pipe

          $text .= $s;

        }

        fclose($pipes[1]);

        // optional:

        while($s= fgets($pipes[2], 1024)) {

          $error .= $s . "\n";

        }

        fclose($pipes[2]);

    }

            

    file_put_contents($tmp_file, '');

    

    if (preg_match('/decryption failed/i', $error)) {

        return false;

    } else {

        return $text;

    }

}

?>
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