Subversion Repositories oidplus

Rev

Rev 874 | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 874 Rev 1042
Line 3... Line 3...
3 
/**
 3 
/**
4 
 * BCMath BigInteger Engine
 4 
 * BCMath BigInteger Engine
5 
 *
 5 
 *
6 
 * PHP version 5 and 7
 6 
 * PHP version 5 and 7
7 
 *
 7 
 *
8 
 * @category  Math
 - 
 
9 
 * @package   BigInteger
 - 
 
10 
 * @author    Jim Wigginton <terrafrost@php.net>
 8 
 * @author    Jim Wigginton <terrafrost@php.net>
11 
 * @copyright 2017 Jim Wigginton
 9 
 * @copyright 2017 Jim Wigginton
12 
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 10 
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
13 
 * @link      http://pear.php.net/package/Math_BigInteger
 11 
 * @link      http://pear.php.net/package/Math_BigInteger
14 
 */
 12 
 */
15 
 
 13 
 
16 
namespace phpseclib3\Math\BigInteger\Engines;
 14 
namespace phpseclib3\Math\BigInteger\Engines;
17 
 
 15 
 
18 
use ParagonIE\ConstantTime\Hex;
 16 
use phpseclib3\Common\Functions\Strings;
19 
use phpseclib3\Exception\BadConfigurationException;
 17 
use phpseclib3\Exception\BadConfigurationException;
20 
 
 18 
 
21 
/**
 19 
/**
22 
 * BCMath Engine.
 20 
 * BCMath Engine.
23 
 *
 21 
 *
24 
 * @package BCMath
 - 
 
25 
 * @author  Jim Wigginton <terrafrost@php.net>
 22 
 * @author  Jim Wigginton <terrafrost@php.net>
26 
 * @access  public
 - 
 
27 
 */
 23 
 */
28 
class BCMath extends Engine
 24 
class BCMath extends Engine
29 
{
 25 
{
30 
    /**
 26 
    /**
31 
     * Can Bitwise operations be done fast?
 27 
     * Can Bitwise operations be done fast?
32 
     *
 28 
     *
33 
     * @see parent::bitwise_leftRotate()
 29 
     * @see parent::bitwise_leftRotate()
34 
     * @see parent::bitwise_rightRotate()
 30 
     * @see parent::bitwise_rightRotate()
35 
     * @access protected
 - 
 
36 
     */
 31 
     */
37 
    const FAST_BITWISE = false;
 32 
    const FAST_BITWISE = false;
38 
 
 33 
 
39 
    /**
 34 
    /**
40 
     * Engine Directory
 35 
     * Engine Directory
41 
     *
 36 
     *
42 
     * @see parent::setModExpEngine
 37 
     * @see parent::setModExpEngine
43 
     * @access protected
 - 
 
44 
     */
 38 
     */
45 
    const ENGINE_DIR = 'BCMath';
 39 
    const ENGINE_DIR = 'BCMath';
46 
 
 40 
 
47 
    /**
 41 
    /**
48 
     * Test for engine validity
 42 
     * Test for engine validity
Line 85... Line 79...
85 
    protected function initialize($base)
 79 
    protected function initialize($base)
86 
    {
 80 
    {
87 
        switch (abs($base)) {
 81 
        switch (abs($base)) {
88 
            case 256:
 82 
            case 256:
89 
                // round $len to the nearest 4
 83 
                // round $len to the nearest 4
90 
                $len = (strlen($this->value) + 3) & 0xFFFFFFFC;
 84 
                $len = (strlen($this->value) + 3) & ~3;
91 
 
 85 
 
92 
                $x = str_pad($this->value, $len, chr(0), STR_PAD_LEFT);
 86 
                $x = str_pad($this->value, $len, chr(0), STR_PAD_LEFT);
93 
 
 87 
 
94 
                $this->value = '0';
 88 
                $this->value = '0';
95 
                for ($i = 0; $i < $len; $i += 4) {
 89 
                for ($i = 0; $i < $len; $i += 4) {
Line 107... Line 101...
107 
                    $this->value = '-' . $this->value;
 101 
                    $this->value = '-' . $this->value;
108 
                }
 102 
                }
109 
                break;
 103 
                break;
110 
            case 16:
 104 
            case 16:
111 
                $x = (strlen($this->value) & 1) ? '0' . $this->value : $this->value;
 105 
                $x = (strlen($this->value) & 1) ? '0' . $this->value : $this->value;
112 
                $temp = new self(Hex::decode($x), 256);
 106 
                $temp = new self(Strings::hex2bin($x), 256);
113 
                $this->value = $this->is_negative ? '-' . $temp->value : $temp->value;
 107 
                $this->value = $this->is_negative ? '-' . $temp->value : $temp->value;
114 
                $this->is_negative = false;
 108 
                $this->is_negative = false;
115 
                break;
 109 
                break;
116 
            case 10:
 110 
            case 10:
117 
                // explicitly casting $x to a string is necessary, here, since doing $x[0] on -1 yields different
 111 
                // explicitly casting $x to a string is necessary, here, since doing $x[0] on -1 yields different