<?php

namespace PHPCensor\Helper;

use PHPCensor\Config;

/**

* Helper class for dealing with SSH keys.

*/

class SshKey

{

/**

* Uses ssh-keygen to generate a public/private key pair.

*

* @return array

*/

public function generate()

{

$tempPath = sys_get_temp_dir() . '/';

$keyFile = $tempPath . md5(microtime(true));

if (!is_dir($tempPath)) {

mkdir($tempPath);

}

$return = [

'ssh_private_key' => '',

'ssh_public_key' => ''

];

$sshStrength = Config::getInstance()->get('php-censor.ssh.strength', 2048);

$sshComment = Config::getInstance()->get('php-censor.ssh.comment', 'admin@php-censor');

$output = @shell_exec(

sprintf(

'ssh-keygen -t rsa -b %s -f %s -N "" -C "%s"',

$sshStrength,

$keyFile,

$sshComment

)

);

if (!empty($output)) {

$pub = file_get_contents($keyFile . '.pub');

$prv = file_get_contents($keyFile);

if (!empty($pub)) {

$return['ssh_public_key'] = $pub;

}

if (!empty($prv)) {

$return['ssh_private_key'] = $prv;

}

}

return $return;

}

}