GmpMath::leftShift() - Code Metrics - Inspection of "Custom ECDH methods based on mdanter/phpecc" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

Push — v7 ( a687dc...e264c8 )

by Florent

created 2017-09-10 19:59 UTC

GmpMath::leftShift() A

↳ Parent: GmpMath

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	5
rs	9.4285
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	2

<?php

namespace Jose\Component\Core\Util\Ecc\Math;

use Jose\Component\Core\Util\Ecc\Util\BinaryString;

final class GmpMath
{
    /**
     * {@inheritDoc}
     * @see GmpMath::cmp()
     */
    public function cmp(\GMP $first, \GMP $other)
    {
        return gmp_cmp($first, $other);
    }

    /**
     * @param \GMP $first
     * @param \GMP $other
     * @return bool
     */
    public function equals(\GMP $first, \GMP $other)
    {
        return gmp_cmp($first, $other) === 0;
    }
    
    /**
     * {@inheritDoc}
     * @see GmpMath::mod()
     */
    public function mod(\GMP $number, \GMP $modulus)
    {
        return gmp_mod($number, $modulus);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::add()
     */
    public function add(\GMP $augend, \GMP $addend)
    {
        return gmp_add($augend, $addend);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::sub()
     */
    public function sub(\GMP $minuend, \GMP $subtrahend)
    {
        return gmp_sub($minuend, $subtrahend);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::mul()
     */
    public function mul(\GMP $multiplier, \GMP $multiplicand)
    {
        return gmp_mul($multiplier, $multiplicand);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::div()
     */
    public function div(\GMP $dividend, \GMP $divisor)
    {
        return gmp_div($dividend, $divisor);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::pow()
     */
    public function pow(\GMP $base, $exponent)
    {
        return gmp_pow($base, $exponent);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::bitwiseAnd()
     */
    public function bitwiseAnd(\GMP $first, \GMP $other)
    {
        return gmp_and($first, $other);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::rightShift()
     */
    public function rightShift(\GMP $number, $positions)
    {
        // Shift 1 right = div / 2
        return gmp_div($number, gmp_pow(gmp_init(2, 10), $positions));
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::bitwiseXor()
     */
    public function bitwiseXor(\GMP $first, \GMP $other)
    {
        return gmp_xor($first, $other);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::leftShift()
     */
    public function leftShift(\GMP $number, $positions)
    {
        // Shift 1 left = mul by 2
        return gmp_mul($number, gmp_pow(2, $positions));
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::toString()
     */
    public function toString(\GMP $value)
    {
        return gmp_strval($value);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::hexDec()
     */
    public function hexDec($hex)
    {
        return gmp_strval(gmp_init($hex, 16), 10);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::decHex()
     */
    public function decHex($dec)
    {
        $dec = gmp_init($dec, 10);

        if (gmp_cmp($dec, 0) < 0) {
            throw new \InvalidArgumentException('Unable to convert negative integer to string');
        }

        $hex = gmp_strval($dec, 16);

        if (BinaryString::length($hex) % 2 != 0) {
            $hex = '0'.$hex;
        }

        return $hex;
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::powmod()
     */
    public function powmod(\GMP $base, \GMP $exponent, \GMP $modulus)
    {
        if ($this->cmp($exponent, gmp_init(0, 10)) < 0) {
            throw new \InvalidArgumentException("Negative exponents (" . $this->toString($exponent) . ") not allowed.");
        }

        return gmp_powm($base, $exponent, $modulus);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::isPrime()
     */
    public function isPrime(\GMP $n)
    {
        $prob = gmp_prob_prime($n);

        if ($prob > 0) {
            return true;
        }

        return false;
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::nextPrime()
     */
    public function nextPrime(\GMP $starting_value)
    {
        return gmp_nextprime($starting_value);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::inverseMod()
     */
    public function inverseMod(\GMP $a, \GMP $m)
    {
        return gmp_invert($a, $m);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::jacobi()
     */
    public function jacobi(\GMP $a, \GMP $n)
    {
        return gmp_jacobi($a, $n);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::intToString()
     */
    public function intToString(\GMP $x)
    {
        if (gmp_cmp($x, 0) < 0) {
            throw new \InvalidArgumentException('Unable to convert negative integer to string');
        }

        $hex = gmp_strval($x, 16);

        if (BinaryString::length($hex) % 2 != 0) {
            $hex = '0'.$hex;
        }

        return pack('H*', $hex);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::stringToInt()
     */
    public function stringToInt($s)
    {
        $result = gmp_init(0, 10);
        $sLen = BinaryString::length($s);

        for ($c = 0; $c < $sLen; $c ++) {
            $result = gmp_add(gmp_mul(256, $result), gmp_init(ord($s[$c]), 10));
        }

        return $result;
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::digestInteger()
     */
    public function digestInteger(\GMP $m)
    {
        return $this->stringToInt(hash('sha1', $this->intToString($m), true));
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::gcd2()
     */
    public function gcd2(\GMP $a, \GMP $b)
    {
        while ($this->cmp($a, gmp_init(0)) > 0) {
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
            $temp = $a;
            $a = $this->mod($b, $a);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
            $b = $temp;
        }

        return $b;
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::baseConvert()
     */
    public function baseConvert($number, $from, $to)
    {
        return gmp_strval(gmp_init($number, $from), $to);
    }

    /**
     * {@inheritDoc}
     * @see GmpMath::getNumberTheory()
     */
    public function getNumberTheory()
    {
        return new NumberTheory($this);
    }

    /**
     * @param \GMP $modulus
     * @return ModularArithmetic
     */
    public function getModularArithmetic(\GMP $modulus)
    {
        return new ModularArithmetic($this, $modulus);
    }
}


1			<?php
2
3			namespace Jose\Component\Core\Util\Ecc\Math;
4
5			use Jose\Component\Core\Util\Ecc\Util\BinaryString;
6
7			final class GmpMath
8			{
9			/**
10			* {@inheritDoc}
11			* @see GmpMath::cmp()
12			*/
13			public function cmp(\GMP $first, \GMP $other)
14			{
15			return gmp_cmp($first, $other);
16			}
17
18			/**
19			* @param \GMP $first
20			* @param \GMP $other
21			* @return bool
22			*/
23			public function equals(\GMP $first, \GMP $other)
24			{
25			return gmp_cmp($first, $other) === 0;
26			}
27
28			/**
29			* {@inheritDoc}
30			* @see GmpMath::mod()
31			*/
32			public function mod(\GMP $number, \GMP $modulus)
33			{
34			return gmp_mod($number, $modulus);
35			}
36
37			/**
38			* {@inheritDoc}
39			* @see GmpMath::add()
40			*/
41			public function add(\GMP $augend, \GMP $addend)
42			{
43			return gmp_add($augend, $addend);
44			}
45
46			/**
47			* {@inheritDoc}
48			* @see GmpMath::sub()
49			*/
50			public function sub(\GMP $minuend, \GMP $subtrahend)
51			{
52			return gmp_sub($minuend, $subtrahend);
53			}
54
55			/**
56			* {@inheritDoc}
57			* @see GmpMath::mul()
58			*/
59			public function mul(\GMP $multiplier, \GMP $multiplicand)
60			{
61			return gmp_mul($multiplier, $multiplicand);
62			}
63
64			/**
65			* {@inheritDoc}
66			* @see GmpMath::div()
67			*/
68			public function div(\GMP $dividend, \GMP $divisor)
69			{
70			return gmp_div($dividend, $divisor);
71			}
72
73			/**
74			* {@inheritDoc}
75			* @see GmpMath::pow()
76			*/
77			public function pow(\GMP $base, $exponent)
78			{
79			return gmp_pow($base, $exponent);
80			}
81
82			/**
83			* {@inheritDoc}
84			* @see GmpMath::bitwiseAnd()
85			*/
86			public function bitwiseAnd(\GMP $first, \GMP $other)
87			{
88			return gmp_and($first, $other);
89			}
90
91			/**
92			* {@inheritDoc}
93			* @see GmpMath::rightShift()
94			*/
95			public function rightShift(\GMP $number, $positions)
96			{
97			// Shift 1 right = div / 2
98			return gmp_div($number, gmp_pow(gmp_init(2, 10), $positions));
99			}
100
101			/**
102			* {@inheritDoc}
103			* @see GmpMath::bitwiseXor()
104			*/
105			public function bitwiseXor(\GMP $first, \GMP $other)
106			{
107			return gmp_xor($first, $other);
108			}
109
110			/**
111			* {@inheritDoc}
112			* @see GmpMath::leftShift()
113			*/
114			public function leftShift(\GMP $number, $positions)
115			{
116			// Shift 1 left = mul by 2
117			return gmp_mul($number, gmp_pow(2, $positions));
118			}
119
120			/**
121			* {@inheritDoc}
122			* @see GmpMath::toString()
123			*/
124			public function toString(\GMP $value)
125			{
126			return gmp_strval($value);
127			}
128
129			/**
130			* {@inheritDoc}
131			* @see GmpMath::hexDec()
132			*/
133			public function hexDec($hex)
134			{
135			return gmp_strval(gmp_init($hex, 16), 10);
136			}
137
138			/**
139			* {@inheritDoc}
140			* @see GmpMath::decHex()
141			*/
142			public function decHex($dec)
143			{
144			$dec = gmp_init($dec, 10);
145
146			if (gmp_cmp($dec, 0) < 0) {
147			throw new \InvalidArgumentException('Unable to convert negative integer to string');
148			}
149
150			$hex = gmp_strval($dec, 16);
151
152			if (BinaryString::length($hex) % 2 != 0) {
153			$hex = '0'.$hex;
154			}
155
156			return $hex;
157			}
158
159			/**
160			* {@inheritDoc}
161			* @see GmpMath::powmod()
162			*/
163			public function powmod(\GMP $base, \GMP $exponent, \GMP $modulus)
164			{
165			if ($this->cmp($exponent, gmp_init(0, 10)) < 0) {
166			throw new \InvalidArgumentException("Negative exponents (" . $this->toString($exponent) . ") not allowed.");
167			}
168
169			return gmp_powm($base, $exponent, $modulus);
170			}
171
172			/**
173			* {@inheritDoc}
174			* @see GmpMath::isPrime()
175			*/
176			public function isPrime(\GMP $n)
177			{
178			$prob = gmp_prob_prime($n);
179
180			if ($prob > 0) {
181			return true;
182			}
183
184			return false;
185			}
186
187			/**
188			* {@inheritDoc}
189			* @see GmpMath::nextPrime()
190			*/
191			public function nextPrime(\GMP $starting_value)
192			{
193			return gmp_nextprime($starting_value);
194			}
195
196			/**
197			* {@inheritDoc}
198			* @see GmpMath::inverseMod()
199			*/
200			public function inverseMod(\GMP $a, \GMP $m)
201			{
202			return gmp_invert($a, $m);
203			}
204
205			/**
206			* {@inheritDoc}
207			* @see GmpMath::jacobi()
208			*/
209			public function jacobi(\GMP $a, \GMP $n)
210			{
211			return gmp_jacobi($a, $n);
212			}
213
214			/**
215			* {@inheritDoc}
216			* @see GmpMath::intToString()
217			*/
218			public function intToString(\GMP $x)
219			{
220			if (gmp_cmp($x, 0) < 0) {
221			throw new \InvalidArgumentException('Unable to convert negative integer to string');
222			}
223
224			$hex = gmp_strval($x, 16);
225
226			if (BinaryString::length($hex) % 2 != 0) {
227			$hex = '0'.$hex;
228			}
229
230			return pack('H*', $hex);
231			}
232
233			/**
234			* {@inheritDoc}
235			* @see GmpMath::stringToInt()
236			*/
237			public function stringToInt($s)
238			{
239			$result = gmp_init(0, 10);
240			$sLen = BinaryString::length($s);
241
242			for ($c = 0; $c < $sLen; $c ++) {
243			$result = gmp_add(gmp_mul(256, $result), gmp_init(ord($s[$c]), 10));
244			}
245
246			return $result;
247			}
248
249			/**
250			* {@inheritDoc}
251			* @see GmpMath::digestInteger()
252			*/
253			public function digestInteger(\GMP $m)
254			{
255			return $this->stringToInt(hash('sha1', $this->intToString($m), true));
256			}
257
258			/**
259			* {@inheritDoc}
260			* @see GmpMath::gcd2()
261			*/
262			public function gcd2(\GMP $a, \GMP $b)
263			{
264			while ($this->cmp($a, gmp_init(0)) > 0) {
			1 ignored issue – show Bug introduced 2017-09-10 20:02 UTC by Report Bug Copy Issue Report It seems like `$a` defined by `$this->mod($b, $a)` on line `266` can also be of type `resource`; however, `Jose\Component\Core\Util\Ecc\Math\GmpMath::cmp()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
265			$temp = $a;
266			$a = $this->mod($b, $a);
			2 ignored issues – show Bug introduced 2017-09-10 20:02 UTC by Report Bug Copy Issue Report It seems like `$b` defined by `$temp` on line `267` can also be of type `resource`; however, `Jose\Component\Core\Util\Ecc\Math\GmpMath::mod()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string / function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history... Bug introduced 2017-09-10 20:02 UTC by Report Bug Copy Issue Report It seems like `$a` defined by `$this->mod($b, $a)` on line `266` can also be of type `resource`; however, `Jose\Component\Core\Util\Ecc\Math\GmpMath::mod()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /* * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
267			$b = $temp;
268			}
269
270			return $b;
271			}
272
273			/**
274			* {@inheritDoc}
275			* @see GmpMath::baseConvert()
276			*/
277			public function baseConvert($number, $from, $to)
278			{
279			return gmp_strval(gmp_init($number, $from), $to);
280			}
281
282			/**
283			* {@inheritDoc}
284			* @see GmpMath::getNumberTheory()
285			*/
286			public function getNumberTheory()
287			{
288			return new NumberTheory($this);
289			}
290
291			/**
292			* @param \GMP $modulus
293			* @return ModularArithmetic
294			*/
295			public function getModularArithmetic(\GMP $modulus)
296			{
297			return new ModularArithmetic($this, $modulus);
298			}
299			}
300

Spomky-Labs / jose

Push — v7 ( a687dc...e264c8 )

GmpMath::leftShift() A

Complexity

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Duplication

Importance

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