mirror of
https://github.com/danog/tgseclib.git
synced 2024-12-11 08:39:43 +01:00
80 lines
3.0 KiB
PHP
80 lines
3.0 KiB
PHP
<?php
|
|
|
|
/**
|
|
* secp192r1
|
|
*
|
|
* This is the NIST P-192 curve
|
|
*
|
|
* PHP version 5 and 7
|
|
*
|
|
* @category Crypt
|
|
* @package EC
|
|
* @author Jim Wigginton <terrafrost@php.net>
|
|
* @copyright 2017 Jim Wigginton
|
|
* @license http://www.opensource.org/licenses/mit-license.html MIT License
|
|
* @link http://pear.php.net/package/Math_BigInteger
|
|
*/
|
|
|
|
namespace phpseclib\Crypt\EC\Curves;
|
|
|
|
use phpseclib\Crypt\EC\BaseCurves\Prime;
|
|
use phpseclib\Math\BigInteger;
|
|
|
|
class secp192r1 extends Prime
|
|
{
|
|
public function __construct()
|
|
{
|
|
$modulo = new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF', 16);
|
|
$this->setModulo($modulo);
|
|
|
|
// algorithm 2.27 from http://diamond.boisestate.edu/~liljanab/MATH308/GuideToECC.pdf#page=66
|
|
/* in theory this should be faster than regular modular reductions save for one small issue.
|
|
to convert to / from base-2**8 with BCMath you have to call bcmul() and bcdiv() a lot.
|
|
to convert to / from base-2**8 with PHP64 you have to call base256_rshift() a lot.
|
|
in short, converting to / from base-2**8 is pretty expensive and that expense is
|
|
enough to offset whatever else might be gained by a simplified reduction algorithm.
|
|
now, if PHP supported unsigned integers things might be different. no bit-shifting
|
|
would be required for the PHP engine and it'd be a lot faster. but as is, BigInteger
|
|
uses base-2**31 or base-2**26 depending on whether or not the system is has a 32-bit
|
|
or a 64-bit OS.
|
|
*/
|
|
/*
|
|
$m_length = $this->getLengthInBytes();
|
|
$this->setReduction(function($c) use ($m_length) {
|
|
$cBytes = $c->toBytes();
|
|
$className = $this->className;
|
|
|
|
if (strlen($cBytes) > 2 * $m_length) {
|
|
list(, $r) = $c->divide($className::$modulo);
|
|
return $r;
|
|
}
|
|
|
|
$c = str_pad($cBytes, 48, "\0", STR_PAD_LEFT);
|
|
$c = array_reverse(str_split($c, 8));
|
|
|
|
$null = "\0\0\0\0\0\0\0\0";
|
|
$s1 = new BigInteger($c[2] . $c[1] . $c[0], 256);
|
|
$s2 = new BigInteger($null . $c[3] . $c[3], 256);
|
|
$s3 = new BigInteger($c[4] . $c[4] . $null, 256);
|
|
$s4 = new BigInteger($c[5] . $c[5] . $c[5], 256);
|
|
|
|
$r = $s1->add($s2)->add($s3)->add($s4);
|
|
while ($r->compare($className::$modulo) >= 0) {
|
|
$r = $r->subtract($className::$modulo);
|
|
}
|
|
|
|
return $r;
|
|
});
|
|
*/
|
|
|
|
$this->setCoefficients(
|
|
new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC', 16),
|
|
new BigInteger('64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1', 16)
|
|
);
|
|
$this->setBasePoint(
|
|
new BigInteger('188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012', 16),
|
|
new BigInteger('07192B95FFC8DA78631011ED6B24CDD573F977A11E794811', 16)
|
|
);
|
|
$this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831', 16));
|
|
}
|
|
} |