Scalr\Model\Entity\SshKey::getPuttyPrivateKey PHP Метод

    public function getPuttyPrivateKey()
    {
        $descriptorSpec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("pipe", "w"));
        $pemPrivateKey = tempnam("/tmp", "SSHPEM");
        @file_put_contents($pemPrivateKey, $this->privateKey);
        @chmod($pemPrivateKey, 0600);
        $ppkPrivateKey = tempnam("/tmp", "SSHPPK");
        $keyName = $this->cloudKeyName;
        if ($this->cloudLocation) {
            $keyName .= ".{$this->cloudLocation}";
        }
        $puttygenExecPackage = '/opt/scalr-server/embedded/bin/puttygen';
        $puttygenExec = is_executable($puttygenExecPackage) ? $puttygenExecPackage : 'puttygen';
        $pipes = array();
        $process = @proc_open("{$puttygenExec} {$pemPrivateKey} -C {$keyName} -o {$ppkPrivateKey}", $descriptorSpec, $pipes);
        if (@is_resource($process)) {
            @fclose($pipes[0]);
            stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            fclose($pipes[2]);
        }
        $retval = file_get_contents($ppkPrivateKey);
        @unlink($pemPrivateKey);
        @unlink($ppkPrivateKey);
        return $retval;
    }