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Code Issues Releases Wiki Activity

New experimental plugin 'secure mail'

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fabrixxm 2014-12-29 18:10:32 +01:00
parent 9aefbf3def
commit e17cb70379
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securemail/php-gpg/libs/GPG.php Normal file
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<?php
/** @package php-gpg */
/** require supporting files */
require_once("GPG/Expanded_Key.php");
require_once("GPG/Public_Key.php");
require_once("GPG/AES.php");
require_once("GPG/globals.php");
/**
* Pure PHP implementation of PHP/GPG encryption.
* Supports RSA, DSA public key length of 2,4,8,16,512,1024,2048 or 4096
* Currently supports only encrypt
*
* @package php-gpg::Encryption
* @link http://www.verysimple.com/
* @copyright 1997-2012 VerySimple, Inc.
* @license http://www.gnu.org/licenses/gpl.html GPL
* @todo implement decryption
* @version 1.1
*
* @example
* require_once 'libs/GPG.php';
* $gpg = new GPG();
* $pub_key = new GPG_Public_Key($public_key_ascii);
* $encrypted = $gpg->encrypt($pub_key,$plain_text_string);
*/
class GPG
{
private $width = 16;
private $el = array(3, 5, 9, 17, 513, 1025, 2049, 4097);
private $version = "1.4.7";
private function gpg_encrypt($key, $text) {
$i = 0;
$i = 0;
$len = strlen($text);
$len = strlen($text);
$iblock = array_fill(0, $this->width, 0);
$rblock = array_fill(0, $this->width, 0);
$ct = array_fill(0, $this->width + 2, 0);
$cipher = "";
if($len % $this->width) {
for($i = ($len % $this->width); $i < $this->width; $i++) $text .= "\0";
}
$ekey = new Expanded_Key($key);
for($i = 0; $i < $this->width; $i++) {
$iblock[$i] = 0;
$rblock[$i] = GPG_Utility::c_random();
}
$iblock = GPG_AES::encrypt($iblock, $ekey);
for($i = 0; $i < $this->width; $i++) {
$ct[$i] = ($iblock[$i] ^= $rblock[$i]);
}
$iblock = GPG_AES::encrypt($iblock, $ekey);
$ct[$this->width] = ($iblock[0] ^ $rblock[$this->width - 2]);
$ct[$this->width + 1] = ($iblock[1] ^ $rblock[$this->width - 1]);
for($i = 0; $i < $this->width + 2; $i++) $cipher .= chr($ct[$i]);
$iblock = array_slice($ct, 2, $this->width + 2);
for($n = 0; $n < strlen($text); $n += $this->width) {
$iblock = GPG_AES::encrypt($iblock, $ekey);
for($i = 0; $i < $this->width; $i++) {
$iblock[$i] ^= ord($text[$n + $i]);
$cipher .= chr($iblock[$i]);
}
}
return substr($cipher, 0, $len + $this->width + 2);
}
private function gpg_header($tag, $len)
{
if ($len > 0xff) $tag += 1;
$h = chr($tag);
if ($len > 0xff) $h .= chr($len / 0x100);
$h .= chr($len % 0x100);
return $h;
}
private function gpg_session($key_id, $key_type, $session_key, $public_key)
{
$mod = array();
$exp = array();
$enc = "";
$s = base64_decode($public_key);
$l = floor((ord($s[0]) * 256 + ord($s[1]) + 7) / 8);
$mod = mpi2b(substr($s, 0, $l + 2));
if($key_type) {
$grp = array();
$y = array();
$B = array();
$C = array();
$l2 = floor((ord($s[$l + 2]) * 256 + ord($s[$l + 3]) + 7) / 8) + 2;
$grp = mpi2b(substr($s, $l + 2, $l2));
$y = mpi2b(substr($s, $l + 2 + $l2));
$exp[0] = $this->el[GPG_Utility::c_random() & 7];
$B = bmodexp($grp, $exp, $mod);
$C = bmodexp($y, $exp, $mod);
} else {
$exp = mpi2b(substr($s, $l + 2));
}
$c = 0;
$lsk = strlen($session_key);
for($i = 0; $i < $lsk; $i++) $c += ord($session_key[$i]);
$c &= 0xffff;
$lm = ($l - 2) * 8 + 2;
$m = chr($lm / 256) . chr($lm % 256) .
chr(2) . GPG_Utility::s_random($l - $lsk - 6, 1) . "\0" .
chr(7) . $session_key .
chr($c / 256) . chr($c & 0xff);
if($key_type) {
$enc = b2mpi($B) . b2mpi(bmod(bmul(mpi2b($m), $C), $mod));
return $this->gpg_header(0x84,strlen($enc) + 10) .
chr(3) . $key_id . chr(16) . $enc;
} else {
$enc = b2mpi(bmodexp(mpi2b($m), $exp, $mod));
return $this->gpg_header(0x84, strlen($enc) + 10) .
chr(3) . $key_id . chr(1) . $enc;
}
}
private function gpg_literal($text)
{
if (strpos($text, "\r\n") === false)
$text = str_replace("\n", "\r\n", $text);
return
$this->gpg_header(0xac, strlen($text) + 10) . "t" .
chr(4) . "file\0\0\0\0" . $text;
}
private function gpg_data($key, $text)
{
$enc = $this->gpg_encrypt($key, $this->gpg_literal($text));
return $this->gpg_header(0xa4, strlen($enc)) . $enc;
}
/**
* GPG Encypts a message to the provided public key
*
* @param GPG_Public_Key $pk
* @param string $plaintext
* @return string encrypted text
*/
function encrypt($pk, $plaintext)
{
// normalize the public key
$key_id = $pk->GetKeyId();
$key_type = $pk->GetKeyType();
$public_key = $pk->GetPublicKey();
$session_key = GPG_Utility::s_random($this->width, 0);
$key_id = GPG_Utility::hex2bin($key_id);
$cp = $this->gpg_session($key_id, $key_type, $session_key, $public_key) .
$this->gpg_data($session_key, $plaintext);
$code = base64_encode($cp);
$code = wordwrap($code, 60, "\n", 1);
return
"-----BEGIN PGP MESSAGE-----\nVersion: VerySimple PHP-GPG v".$this->version."\n\n" .
$code . "\n=" . base64_encode(GPG_Utility::crc24($cp)) .
"\n-----END PGP MESSAGE-----\n";
}
}
?>