Decrypting files using GnuPG (GPG) via PHP

By: Darrell Brogdon Emailed: 1674 times Printed: 2149 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

Decrypting an encrypted file with PHP and GnuPG can be a bit more complex than encrypting, since you are required to provide a GnuPG passphrase. The solution to having to type the passphrase every time the script is run lies in a handy little gpg switch called --passphrase-fd. This switch tells GnuPG to accept the passphrase from a file descriptor, which means that you can echo the passphrase and pipe the output to gpg, as seen in the following example.

<?php 
$gpg = '/usr/bin/gpg'; 
$passphrase = 'My secret pass phrase.'; 
$encrypted_file = 'foo.gpg'; 
$unencrypted_file = 'foo.txt'; 

echo shell_exec("echo $passphrase | $gpg --passphrase-fd 0 -o $unencrypted_file -d $encrypted_file"); 
?>

This script tells gpg to accept the passphrase from STDIN (indicated by the 0 following the switch) and decrypt the information into a file named "foo.txt".

As with encrypting information, you can leave off the -oswitch to gpg and let the decrypted data be captured inside a variable. 

It should be noted that the -o switch should always come before the -d switch.


PHP Home | All PHP Tutorials | Latest PHP Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.



Bookmark and Share

Comments(0)


Be the first one to add a comment

Your name (required):


Your email(required, will not be shown to the public):


Your sites URL (optional):


Your comments:



More Tutorials by Darrell Brogdon
Decrypting files using GnuPG (GPG) via PHP
Encrypting files using GnuPG (GPG) via PHP
How to use GnuPG (GPG)?
What is PGP?

More Tutorials in PHP
PHP code to import from CSV file to MySQL
PHP code to write to a CSV file from MySQL query
PHP code to write to a CSV file for Microsoft Applications
Convert XML to CSV in PHP
Password must include both numeric and alphabetic characters - Magento
PHP file upload (Large Files)
PHP file upload prompts authentication for anonymous users
PHP file upload with IIS on windows XP/2000 etc
Error: Length parameter must be greater than 0
Multiple File Upload in PHP using IFRAME
Resume or Pause File Uploads in PHP
Exception in module wampmanager.exe at 000F15A0 in Windows 8
Handling file locks in PHP
HTML table output using Nested for loops in PHP
Count occurrences of a character in a String in PHP

More Latest News
Most Viewed Articles (in PHP )
Different versions of PHP - History and evolution of PHP
Input Validation in PHP
PHP code to write to a CSV file from MySQL query
public, protected, and private Properties in PHP
preg_split() and explode() in PHP
Using Codeigniter for PHP application development
Parent: child process exited with status 3221225477 -- Restarting
Convert a hex string into a 32-bit IEEE 754 float number in PHP
isset() function in PHP
Encrypting files using GnuPG (GPG) via PHP
func_get_arg() and func_get_args() functions in PHP
use() in PHP
Here-docs (<<<) in PHP
Traversing Arrays Using list() and each() in PHP
Binary Operators in PHP
Most Emailed Articles (in PHP)
PHP code to write to a CSV file for Microsoft Applications
Counting Lines, Paragraphs, or Records in a File using pc_split_paragraphs() in PHP
Reading word by word from a file in PHP
PHP code to import from CSV file to MySQL
PHP code to write to a CSV file from MySQL query
Convert XML to CSV in PHP
Using list() in PHP
Constants in PHP
Decrypting files using GnuPG (GPG) via PHP
Perl's Encoding::FixLatin equivalent in PHP
Password must include both numeric and alphabetic characters - Magento
Here-docs (<<<) in PHP
if Statements in PHP
for Loops in PHP
public, protected, and private Properties in PHP