RSA - Code Metrics - Inspection of "Methods renamed to fit on PSR-1 requirement" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

Push — master ( 7fd11e...04be58 )

by Florent

created 2016-08-11 06:36 UTC

RSA A

↳ Parent: Project

Complexity

Total Complexity

Size/Duplication

Total Lines	371
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	4

Importance

Changes	5
Bugs	1	Features	2

Metric	Value
wmc	30
c	5
b	1
f	2
lcom	1
cbo	4
dl	0
loc	371
rs	10

16 Methods

Rating	Name	Size	Complexity
A	convertIntegerToOctetString()	9	2
A	convertOctetStringToInteger()	4	1
A	exponentiate()	19	3
A	encodeEMSAPSS()	18	1
A	verifyEMSAPSS()	23	1
A	encrypt()	16	2
A	decrypt()	14	2
A	sign()	13	1
A	verify()	15	1
A	getRSAEP()	8	3
A	getRSADP()	8	3
A	getRSASP1()	8	3
A	getRSAVP1()	8	3
A	getMGF1()	11	2
A	encryptRSAESOAEP()	19	1
A	getRSAESOAEP()	21	1

<?php

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose\Util;

use Assert\Assertion;
use Jose\KeyConverter\RSAKey;

final class RSA
{
    /**
     * Integer-to-Octet-String primitive.
     *
     * @param \Jose\Util\BigInteger $x
     * @param int                   $xLen
     *
     * @return string
     */
    private static function convertIntegerToOctetString($x, $xLen)
    {
        $x = $x->toBytes();
        if (strlen($x) > $xLen) {
            return false;
        }

        return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
    }

    /**
     * Octet-String-to-Integer primitive.
     *
     * @param string $x
     *
     * @return \Jose\Util\BigInteger
     */
    private static function convertOctetStringToInteger($x)
    {
        return BigInteger::createFromBinaryString($x);
    }

    /**
     * Exponentiate with or without Chinese Remainder Theorem.
     * Operation with primes 'p' and 'q' is appox. 2x faster.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param \Jose\Util\BigInteger     $c
     *
     * @return \Jose\Util\BigInteger
     */
    private static function exponentiate(RSAKey $key, BigInteger $c)
    {
        if ($key->isPublic() || empty($key->getPrimes())) {
            return $c->modPow($key->getExponent(), $key->getModulus());
        }

        $p = $key->getPrimes()[0];
        $q = $key->getPrimes()[1];
        $dP = $key->getExponents()[0];
        $dQ = $key->getExponents()[1];
        $qInv = $key->getCoefficient();

        $m1 = $c->modPow($dP, $p);
        $m2 = $c->modPow($dQ, $q);
        $h = $qInv->multiply($m1->subtract($m2)->add($p))->mod($p);
        $m = $m2->add($h->multiply($q));

        return $m;
    }

    /**
     * RSA EP.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param \Jose\Util\BigInteger     $m
     *
     * @return \Jose\Util\BigInteger|false
     */
    private static function getRSAEP(RSAKey $key, BigInteger $m)
    {
        if ($m->compare(BigInteger::createFromDecimal(0)) < 0 || $m->compare($key->getModulus()) > 0) {
            return false;
        }

        return self::exponentiate($key, $m);
    }

    /**
     * RSA DP.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param \Jose\Util\BigInteger     $c
     *
     * @return \Jose\Util\BigInteger|false
     */
    private static function getRSADP(RSAKey $key, BigInteger $c)
    {
        if ($c->compare(BigInteger::createFromDecimal(0)) < 0 || $c->compare($key->getModulus()) > 0) {
            return false;
        }

        return self::exponentiate($key, $c);
    }

    /**
     * RSA SP1.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param \Jose\Util\BigInteger     $m
     *
     * @return \Jose\Util\BigInteger|false
     */
    private static function getRSASP1(RSAKey $key, BigInteger $m)
    {
        if ($m->compare(BigInteger::createFromDecimal(0)) < 0 || $m->compare($key->getModulus()) > 0) {
            return false;
        }

        return self::exponentiate($key, $m);
    }

    /**
     * RSAVP1.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param \Jose\Util\BigInteger     $s
     *
     * @return \Jose\Util\BigInteger|false
     */
    private static function getRSAVP1(RSAKey $key, BigInteger $s)
    {
        if ($s->compare(BigInteger::createFromDecimal(0)) < 0 || $s->compare($key->getModulus()) > 0) {
            return false;
        }

        return self::exponentiate($key, $s);
    }

    /**
     * MGF1.
     *
     * @param string          $mgfSeed
     * @param int             $maskLen
     * @param \Jose\Util\Hash $mgfHash
     *
     * @return string
     */
    private static function getMGF1($mgfSeed, $maskLen, Hash $mgfHash)
    {
        $t = '';
        $count = ceil($maskLen / $mgfHash->getLength());
        for ($i = 0; $i < $count; $i++) {
            $c = pack('N', $i);
            $t .= $mgfHash->hash($mgfSeed.$c);
        }

        return mb_substr($t, 0, $maskLen, '8bit');
    }

    /**
     * RSAES-OAEP-ENCRYPT.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $m
     * @param \Jose\Util\Hash           $hash
     *
     * @return string
     */
    private static function encryptRSAESOAEP(RSAKey $key, $m, Hash $hash)
    {
        $mLen = mb_strlen($m, '8bit');
        $lHash = $hash->hash('');
        $ps = str_repeat(chr(0), $key->getModulusLength() - $mLen - 2 * $hash->getLength() - 2);
        $db = $lHash.$ps.chr(1).$m;
        $seed = random_bytes($hash->getLength());
        $dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/*MGF*/);
        $maskedDB = $db ^ $dbMask;
        $seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/*MGF*/);
        $maskedSeed = $seed ^ $seedMask;
        $em = chr(0).$maskedSeed.$maskedDB;

        $m = self::convertOctetStringToInteger($em);
        $c = self::getRSAEP($key, $m);
        $c = self::convertIntegerToOctetString($c, $key->getModulusLength());
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}

        return $c;
    }

    /**
     * RSAES-OAEP-DECRYPT.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $c
     * @param \Jose\Util\Hash           $hash
     *
     * @return string
     */
    private static function getRSAESOAEP(RSAKey $key, $c, Hash $hash)
    {
        $c = self::convertOctetStringToInteger($c);
        $m = self::getRSADP($key, $c);
        Assertion::isInstanceOf($m, BigInteger::class);
        $em = self::convertIntegerToOctetString($m, $key->getModulusLength());
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}
        $lHash = $hash->hash('');
        $maskedSeed = mb_substr($em, 1, $hash->getLength(), '8bit');
        $maskedDB = mb_substr($em, $hash->getLength() + 1, null, '8bit');
        $seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/*MGF*/);
        $seed = $maskedSeed ^ $seedMask;
        $dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/*MGF*/);
        $db = $maskedDB ^ $dbMask;
        $lHash2 = mb_substr($db, 0, $hash->getLength(), '8bit');
        $m = mb_substr($db, $hash->getLength(), null, '8bit');
        Assertion::eq($lHash, $lHash2);
        $m = ltrim($m, chr(0));
        Assertion::eq(ord($m[0]), 1);

        return mb_substr($m, 1, null, '8bit');
    }

    /**
     * EMSA-PSS-ENCODE.
     *
     * @param string          $m
     * @param int             $emBits
     * @param \Jose\Util\Hash $hash
     *
     * @return string|bool
     */
    private static function encodeEMSAPSS($m, $emBits, Hash $hash)
    {
        $emLen = ($emBits + 1) >> 3;
        $sLen = $hash->getLength();
        $mHash = $hash->hash($m);
        Assertion::greaterThan($emLen, $hash->getLength() + $sLen + 2);
        $salt = random_bytes($sLen);
        $m2 = "\0\0\0\0\0\0\0\0".$mHash.$salt;
        $h = $hash->hash($m2);
        $ps = str_repeat(chr(0), $emLen - $sLen - $hash->getLength() - 2);
        $db = $ps.chr(1).$salt;
        $dbMask = self::getMGF1($h, $emLen - $hash->getLength() - 1, $hash/*MGF*/);
        $maskedDB = $db ^ $dbMask;
        $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
        $em = $maskedDB.$h.chr(0xBC);

        return $em;
    }

    /**
     * EMSA-PSS-VERIFY.
     *
     * @param string          $m
     * @param string          $em
     * @param int             $emBits
     * @param \Jose\Util\Hash $hash
     *
     * @return string
     */
    private static function verifyEMSAPSS($m, $em, $emBits, Hash $hash)
    {
        $emLen = ($emBits + 1) >> 3;
        $sLen = $hash->getLength();
        $mHash = $hash->hash($m);
        Assertion::greaterThan($emLen, $hash->getLength() + $sLen + 2);
        Assertion::eq($em[mb_strlen($em, '8bit') - 1], chr(0xBC));
        $maskedDB = mb_substr($em, 0, -$hash->getLength() - 1, '8bit');
        $h = mb_substr($em, -$hash->getLength() - 1, $hash->getLength(), '8bit');
        $temp = chr(0xFF << ($emBits & 7));
        Assertion::eq(~$maskedDB[0] & $temp, $temp);
        $dbMask = self::getMGF1($h, $emLen - $hash->getLength() - 1, $hash/*MGF*/);
        $db = $maskedDB ^ $dbMask;
        $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
        $temp = $emLen - $hash->getLength() - $sLen - 2;
        Assertion::eq(mb_substr($db, 0, $temp, '8bit'), str_repeat(chr(0), $temp));
        Assertion::eq(ord($db[$temp]), 1);
        $salt = mb_substr($db, $temp + 1, null, '8bit'); // should be $sLen long
        $m2 = "\0\0\0\0\0\0\0\0".$mHash.$salt;
        $h2 = $hash->hash($m2);

        return hash_equals($h, $h2);
    }

    /**
     * Encryption.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $plaintext
     * @param string                    $hash_algorithm
     *
     * @return string
     */
    public static function encrypt(RSAKey $key, $plaintext, $hash_algorithm)
    {
        /**
         * @var Hash
         */
        $hash = Hash::$hash_algorithm();
        $length = $key->getModulusLength() - 2 * $hash->getLength() - 2;
        Assertion::greaterThan($length, 0);
        $plaintext = str_split($plaintext, $length);
        $ciphertext = '';
        foreach ($plaintext as $m) {
            $ciphertext .= self::encryptRSAESOAEP($key, $m, $hash);
        }

        return $ciphertext;
    }

    /**
     * Decryption.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $ciphertext
     * @param string                    $hash_algorithm
     *
     * @return string
     */
    public static function decrypt(RSAKey $key, $ciphertext, $hash_algorithm)
    {
        Assertion::greaterThan($key->getModulusLength(), 0);
        $hash = Hash::$hash_algorithm();
        $ciphertext = str_split($ciphertext, $key->getModulusLength());
        $ciphertext[count($ciphertext) - 1] = str_pad($ciphertext[count($ciphertext) - 1], $key->getModulusLength(), chr(0), STR_PAD_LEFT);
        $plaintext = '';
        foreach ($ciphertext as $c) {
            $temp = self::getRSAESOAEP($key, $c, $hash);
            $plaintext .= $temp;
        }

        return $plaintext;
    }

    /**
     * Create a signature.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $message
     * @param string                    $hash
     *
     * @return string
     */
    public static function sign(RSAKey $key, $message, $hash)
    {
        Assertion::string($message);
        Assertion::string($hash);
        Assertion::inArray($hash, ['sha256', 'sha384', 'sha512']);
        $em = self::encodeEMSAPSS($message, 8 * $key->getModulusLength() - 1, Hash::$hash());
        Assertion::string($em);
        $message = self::convertOctetStringToInteger($em);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
        $signature = self::getRSASP1($key, $message);
        Assertion::isInstanceOf($signature, BigInteger::class);

        return self::convertIntegerToOctetString($signature, $key->getModulusLength());
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}
    }

    /**
     * Verifies a signature.
     *
     * @param \Jose\KeyConverter\RSAKey $key
     * @param string                    $message
     * @param string                    $signature
     * @param string                    $hash
     *
     * @return bool
     */
    public static function verify(RSAKey $key, $message, $signature, $hash)
    {
        Assertion::string($message);
        Assertion::string($signature);
        Assertion::string($hash);
        Assertion::inArray($hash, ['sha256', 'sha384', 'sha512']);
        Assertion::eq(strlen($signature), $key->getModulusLength());
        $modBits = 8 * $key->getModulusLength();
        $s2 = self::convertOctetStringToInteger($signature);
        $m2 = self::getRSAVP1($key, $s2);
        Assertion::isInstanceOf($m2, BigInteger::class);
        $em = self::convertIntegerToOctetString($m2, $modBits >> 3);
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}

        return self::verifyEMSAPSS($message, $em, $modBits - 1, Hash::$hash());
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}
    }
}


1			<?php
2
3			/*
4			* The MIT License (MIT)
5			*
6			* Copyright (c) 2014-2016 Spomky-Labs
7			*
8			* This software may be modified and distributed under the terms
9			* of the MIT license. See the LICENSE file for details.
10			*/
11
12			namespace Jose\Util;
13
14			use Assert\Assertion;
15			use Jose\KeyConverter\RSAKey;
16
17			final class RSA
18			{
19			/**
20			* Integer-to-Octet-String primitive.
21			*
22			* @param \Jose\Util\BigInteger $x
23			* @param int $xLen
24			*
25			* @return string
26			*/
27			private static function convertIntegerToOctetString($x, $xLen)
28			{
29			$x = $x->toBytes();
30			if (strlen($x) > $xLen) {
31			return false;
32			}
33
34			return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
35			}
36
37			/**
38			* Octet-String-to-Integer primitive.
39			*
40			* @param string $x
41			*
42			* @return \Jose\Util\BigInteger
43			*/
44			private static function convertOctetStringToInteger($x)
45			{
46			return BigInteger::createFromBinaryString($x);
47			}
48
49			/**
50			* Exponentiate with or without Chinese Remainder Theorem.
51			* Operation with primes 'p' and 'q' is appox. 2x faster.
52			*
53			* @param \Jose\KeyConverter\RSAKey $key
54			* @param \Jose\Util\BigInteger $c
55			*
56			* @return \Jose\Util\BigInteger
57			*/
58			private static function exponentiate(RSAKey $key, BigInteger $c)
59			{
60			if ($key->isPublic() \|\| empty($key->getPrimes())) {
61			return $c->modPow($key->getExponent(), $key->getModulus());
62			}
63
64			$p = $key->getPrimes()[0];
65			$q = $key->getPrimes()[1];
66			$dP = $key->getExponents()[0];
67			$dQ = $key->getExponents()[1];
68			$qInv = $key->getCoefficient();
69
70			$m1 = $c->modPow($dP, $p);
71			$m2 = $c->modPow($dQ, $q);
72			$h = $qInv->multiply($m1->subtract($m2)->add($p))->mod($p);
73			$m = $m2->add($h->multiply($q));
74
75			return $m;
76			}
77
78			/**
79			* RSA EP.
80			*
81			* @param \Jose\KeyConverter\RSAKey $key
82			* @param \Jose\Util\BigInteger $m
83			*
84			* @return \Jose\Util\BigInteger\|false
85			*/
86			private static function getRSAEP(RSAKey $key, BigInteger $m)
87			{
88			if ($m->compare(BigInteger::createFromDecimal(0)) < 0 \|\| $m->compare($key->getModulus()) > 0) {
89			return false;
90			}
91
92			return self::exponentiate($key, $m);
93			}
94
95			/**
96			* RSA DP.
97			*
98			* @param \Jose\KeyConverter\RSAKey $key
99			* @param \Jose\Util\BigInteger $c
100			*
101			* @return \Jose\Util\BigInteger\|false
102			*/
103			private static function getRSADP(RSAKey $key, BigInteger $c)
104			{
105			if ($c->compare(BigInteger::createFromDecimal(0)) < 0 \|\| $c->compare($key->getModulus()) > 0) {
106			return false;
107			}
108
109			return self::exponentiate($key, $c);
110			}
111
112			/**
113			* RSA SP1.
114			*
115			* @param \Jose\KeyConverter\RSAKey $key
116			* @param \Jose\Util\BigInteger $m
117			*
118			* @return \Jose\Util\BigInteger\|false
119			*/
120			private static function getRSASP1(RSAKey $key, BigInteger $m)
121			{
122			if ($m->compare(BigInteger::createFromDecimal(0)) < 0 \|\| $m->compare($key->getModulus()) > 0) {
123			return false;
124			}
125
126			return self::exponentiate($key, $m);
127			}
128
129			/**
130			* RSAVP1.
131			*
132			* @param \Jose\KeyConverter\RSAKey $key
133			* @param \Jose\Util\BigInteger $s
134			*
135			* @return \Jose\Util\BigInteger\|false
136			*/
137			private static function getRSAVP1(RSAKey $key, BigInteger $s)
138			{
139			if ($s->compare(BigInteger::createFromDecimal(0)) < 0 \|\| $s->compare($key->getModulus()) > 0) {
140			return false;
141			}
142
143			return self::exponentiate($key, $s);
144			}
145
146			/**
147			* MGF1.
148			*
149			* @param string $mgfSeed
150			* @param int $maskLen
151			* @param \Jose\Util\Hash $mgfHash
152			*
153			* @return string
154			*/
155			private static function getMGF1($mgfSeed, $maskLen, Hash $mgfHash)
156			{
157			$t = '';
158			$count = ceil($maskLen / $mgfHash->getLength());
159			for ($i = 0; $i < $count; $i++) {
160			$c = pack('N', $i);
161			$t .= $mgfHash->hash($mgfSeed.$c);
162			}
163
164			return mb_substr($t, 0, $maskLen, '8bit');
165			}
166
167			/**
168			* RSAES-OAEP-ENCRYPT.
169			*
170			* @param \Jose\KeyConverter\RSAKey $key
171			* @param string $m
172			* @param \Jose\Util\Hash $hash
173			*
174			* @return string
175			*/
176			private static function encryptRSAESOAEP(RSAKey $key, $m, Hash $hash)
177			{
178			$mLen = mb_strlen($m, '8bit');
179			$lHash = $hash->hash('');
180			$ps = str_repeat(chr(0), $key->getModulusLength() - $mLen - 2 * $hash->getLength() - 2);
181			$db = $lHash.$ps.chr(1).$m;
182			$seed = random_bytes($hash->getLength());
183			$dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/MGF/);
184			$maskedDB = $db ^ $dbMask;
185			$seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/MGF/);
186			$maskedSeed = $seed ^ $seedMask;
187			$em = chr(0).$maskedSeed.$maskedDB;
188
189			$m = self::convertOctetStringToInteger($em);
190			$c = self::getRSAEP($key, $m);
191			$c = self::convertIntegerToOctetString($c, $key->getModulusLength());
			0 ignored issues – show Security Bug introduced 2016-07-30 20:41 UTC by Report Bug Copy Issue Report It seems like `$c` defined by `self::convertIntegerToOc...ey->getModulusLength())` on line `191` can also be of type `false`; however, `Jose\Util\RSA::convertIntegerToOctetString()` does only seem to accept `object<Jose\Util\BigInteger>`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
192
193			return $c;
194			}
195
196			/**
197			* RSAES-OAEP-DECRYPT.
198			*
199			* @param \Jose\KeyConverter\RSAKey $key
200			* @param string $c
201			* @param \Jose\Util\Hash $hash
202			*
203			* @return string
204			*/
205			private static function getRSAESOAEP(RSAKey $key, $c, Hash $hash)
206			{
207			$c = self::convertOctetStringToInteger($c);
208			$m = self::getRSADP($key, $c);
209			Assertion::isInstanceOf($m, BigInteger::class);
210			$em = self::convertIntegerToOctetString($m, $key->getModulusLength());
			0 ignored issues – show Security Bug introduced 2016-08-11 06:39 UTC by Report Bug Copy Issue Report It seems like `$m` defined by `self::getRSADP($key, $c)` on line `208` can also be of type `false`; however, `Jose\Util\RSA::convertIntegerToOctetString()` does only seem to accept `object<Jose\Util\BigInteger>`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
211			$lHash = $hash->hash('');
212			$maskedSeed = mb_substr($em, 1, $hash->getLength(), '8bit');
213			$maskedDB = mb_substr($em, $hash->getLength() + 1, null, '8bit');
214			$seedMask = self::getMGF1($maskedDB, $hash->getLength(), $hash/MGF/);
215			$seed = $maskedSeed ^ $seedMask;
216			$dbMask = self::getMGF1($seed, $key->getModulusLength() - $hash->getLength() - 1, $hash/MGF/);
217			$db = $maskedDB ^ $dbMask;
218			$lHash2 = mb_substr($db, 0, $hash->getLength(), '8bit');
219			$m = mb_substr($db, $hash->getLength(), null, '8bit');
220			Assertion::eq($lHash, $lHash2);
221			$m = ltrim($m, chr(0));
222			Assertion::eq(ord($m[0]), 1);
223
224			return mb_substr($m, 1, null, '8bit');
225			}
226
227			/**
228			* EMSA-PSS-ENCODE.
229			*
230			* @param string $m
231			* @param int $emBits
232			* @param \Jose\Util\Hash $hash
233			*
234			* @return string\|bool
235			*/
236			private static function encodeEMSAPSS($m, $emBits, Hash $hash)
237			{
238			$emLen = ($emBits + 1) >> 3;
239			$sLen = $hash->getLength();
240			$mHash = $hash->hash($m);
241			Assertion::greaterThan($emLen, $hash->getLength() + $sLen + 2);
242			$salt = random_bytes($sLen);
243			$m2 = "\0\0\0\0\0\0\0\0".$mHash.$salt;
244			$h = $hash->hash($m2);
245			$ps = str_repeat(chr(0), $emLen - $sLen - $hash->getLength() - 2);
246			$db = $ps.chr(1).$salt;
247			$dbMask = self::getMGF1($h, $emLen - $hash->getLength() - 1, $hash/MGF/);
248			$maskedDB = $db ^ $dbMask;
249			$maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
250			$em = $maskedDB.$h.chr(0xBC);
251
252			return $em;
253			}
254
255			/**
256			* EMSA-PSS-VERIFY.
257			*
258			* @param string $m
259			* @param string $em
260			* @param int $emBits
261			* @param \Jose\Util\Hash $hash
262			*
263			* @return string
264			*/
265			private static function verifyEMSAPSS($m, $em, $emBits, Hash $hash)
266			{
267			$emLen = ($emBits + 1) >> 3;
268			$sLen = $hash->getLength();
269			$mHash = $hash->hash($m);
270			Assertion::greaterThan($emLen, $hash->getLength() + $sLen + 2);
271			Assertion::eq($em[mb_strlen($em, '8bit') - 1], chr(0xBC));
272			$maskedDB = mb_substr($em, 0, -$hash->getLength() - 1, '8bit');
273			$h = mb_substr($em, -$hash->getLength() - 1, $hash->getLength(), '8bit');
274			$temp = chr(0xFF << ($emBits & 7));
275			Assertion::eq(~$maskedDB[0] & $temp, $temp);
276			$dbMask = self::getMGF1($h, $emLen - $hash->getLength() - 1, $hash/MGF/);
277			$db = $maskedDB ^ $dbMask;
278			$db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
279			$temp = $emLen - $hash->getLength() - $sLen - 2;
280			Assertion::eq(mb_substr($db, 0, $temp, '8bit'), str_repeat(chr(0), $temp));
281			Assertion::eq(ord($db[$temp]), 1);
282			$salt = mb_substr($db, $temp + 1, null, '8bit'); // should be $sLen long
283			$m2 = "\0\0\0\0\0\0\0\0".$mHash.$salt;
284			$h2 = $hash->hash($m2);
285
286			return hash_equals($h, $h2);
287			}
288
289			/**
290			* Encryption.
291			*
292			* @param \Jose\KeyConverter\RSAKey $key
293			* @param string $plaintext
294			* @param string $hash_algorithm
295			*
296			* @return string
297			*/
298			public static function encrypt(RSAKey $key, $plaintext, $hash_algorithm)
299			{
300			/**
301			* @var Hash
302			*/
303			$hash = Hash::$hash_algorithm();
304			$length = $key->getModulusLength() - 2 * $hash->getLength() - 2;
305			Assertion::greaterThan($length, 0);
306			$plaintext = str_split($plaintext, $length);
307			$ciphertext = '';
308			foreach ($plaintext as $m) {
309			$ciphertext .= self::encryptRSAESOAEP($key, $m, $hash);
310			}
311
312			return $ciphertext;
313			}
314
315			/**
316			* Decryption.
317			*
318			* @param \Jose\KeyConverter\RSAKey $key
319			* @param string $ciphertext
320			* @param string $hash_algorithm
321			*
322			* @return string
323			*/
324			public static function decrypt(RSAKey $key, $ciphertext, $hash_algorithm)
325			{
326			Assertion::greaterThan($key->getModulusLength(), 0);
327			$hash = Hash::$hash_algorithm();
328			$ciphertext = str_split($ciphertext, $key->getModulusLength());
329			$ciphertext[count($ciphertext) - 1] = str_pad($ciphertext[count($ciphertext) - 1], $key->getModulusLength(), chr(0), STR_PAD_LEFT);
330			$plaintext = '';
331			foreach ($ciphertext as $c) {
332			$temp = self::getRSAESOAEP($key, $c, $hash);
333			$plaintext .= $temp;
334			}
335
336			return $plaintext;
337			}
338
339			/**
340			* Create a signature.
341			*
342			* @param \Jose\KeyConverter\RSAKey $key
343			* @param string $message
344			* @param string $hash
345			*
346			* @return string
347			*/
348			public static function sign(RSAKey $key, $message, $hash)
349			{
350			Assertion::string($message);
351			Assertion::string($hash);
352			Assertion::inArray($hash, ['sha256', 'sha384', 'sha512']);
353			$em = self::encodeEMSAPSS($message, 8 * $key->getModulusLength() - 1, Hash::$hash());
354			Assertion::string($em);
355			$message = self::convertOctetStringToInteger($em);
			0 ignored issues – show Bug introduced 2016-07-31 19:01 UTC by Report Bug Copy Issue Report It seems like `$em` defined by `self::encodeEMSAPSS($mes...ose\Util\Hash::$hash())` on line `353` can also be of type `boolean`; however, `Jose\Util\RSA::convertOctetStringToInteger()` does only seem to accept `string`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($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...
356			$signature = self::getRSASP1($key, $message);
357			Assertion::isInstanceOf($signature, BigInteger::class);
358
359			return self::convertIntegerToOctetString($signature, $key->getModulusLength());
			0 ignored issues – show Security Bug introduced 2016-08-11 06:39 UTC by Report Bug Copy Issue Report It seems like `$signature` defined by `self::getRSASP1($key, $message)` on line `356` can also be of type `false`; however, `Jose\Util\RSA::convertIntegerToOctetString()` does only seem to accept `object<Jose\Util\BigInteger>`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
360			}
361
362			/**
363			* Verifies a signature.
364			*
365			* @param \Jose\KeyConverter\RSAKey $key
366			* @param string $message
367			* @param string $signature
368			* @param string $hash
369			*
370			* @return bool
371			*/
372			public static function verify(RSAKey $key, $message, $signature, $hash)
373			{
374			Assertion::string($message);
375			Assertion::string($signature);
376			Assertion::string($hash);
377			Assertion::inArray($hash, ['sha256', 'sha384', 'sha512']);
378			Assertion::eq(strlen($signature), $key->getModulusLength());
379			$modBits = 8 * $key->getModulusLength();
380			$s2 = self::convertOctetStringToInteger($signature);
381			$m2 = self::getRSAVP1($key, $s2);
382			Assertion::isInstanceOf($m2, BigInteger::class);
383			$em = self::convertIntegerToOctetString($m2, $modBits >> 3);
			0 ignored issues – show Security Bug introduced 2016-08-11 06:39 UTC by Report Bug Copy Issue Report It seems like `$m2` defined by `self::getRSAVP1($key, $s2)` on line `381` can also be of type `false`; however, `Jose\Util\RSA::convertIntegerToOctetString()` does only seem to accept `object<Jose\Util\BigInteger>`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
384
385			return self::verifyEMSAPSS($message, $em, $modBits - 1, Hash::$hash());
			0 ignored issues – show Security Bug introduced 2016-07-31 19:01 UTC by Report Bug Copy Issue Report It seems like `$em` defined by `self::convertIntegerToOc...ing($m2, $modBits >> 3)` on line `383` can also be of type `false`; however, `Jose\Util\RSA::verifyEMSAPSS()` does only seem to accept `string`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
386			}
387			}
388

Spomky-Labs / jose

Push — master ( 7fd11e...04be58 )

RSA A

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