function __construct($data = NULL, $opt = array())
{
parent::__construct();
$this->data = $data;
$this->format = $opt['format'] ? $opt['format'] : 'b';
$this->filename = $opt['filename'] ? $opt['filename'] : 'data';
$this->timestamp = $opt['timestamp'] ? $opt['timestamp'] : time();
}
function __construct($sha1 = '')
{
parent::__construct();
$this->data = $sha1;
}
/**
*/
public function decrypt($msg, $key)
{
$decryptor = new OpenPGP_Crypt_RSA($key->message);
$elgamal = null;
foreach ($msg->message as $val) {
if ($val instanceof OpenPGP_AsymmetricSessionKeyPacket) {
$pkey = $decryptor->key($val->keyid);
if (!$pkey instanceof OpenPGP_PublicKeyPacket) {
continue;
}
switch ($pkey->algorithm) {
case 1:
case 2:
return new Horde_Pgp_Element_Message($decryptor->decrypt($msg->message));
case 16:
$elgamal = new Horde_Pgp_Crypt_Elgamal($pkey);
/* Put encrypted data into a packet object to take
* advantage of built-in MPI read methods. */
$edata = new OpenPGP_Packet();
$edata->input = $val->encrypted_data;
$sk_data = $elgamal->decrypt($edata->read_mpi() . $edata->read_mpi());
$sk = substr($sk_data, 1, strlen($sk_data) - 3);
/* Last 2 bytes are checksum */
$chk = unpack('n', substr($sk_data, -2));
$chk = reset($chk);
$sk_chk = 0;
for ($i = 0, $j = strlen($sk); $i < $j; ++$i) {
$sk_chk = ($sk_chk + ord($sk[$i])) % 65536;
}
if ($sk_chk != $chk) {
throw new RuntimeException();
}
return new Horde_Pgp_Element_Message(OpenPGP_Crypt_Symmetric::decryptPacket(OpenPGP_Crypt_Symmetric::getEncryptedData($msg->message), ord($sk_data[0]), $sk));
}
}
}
throw new RuntimeException();
}
