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content/vendor/paragonie/random_compat/lib/random_int.php
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204
content/vendor/paragonie/random_compat/lib/random_int.php
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<?php
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if (!is_callable('random_int')) {
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/**
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* Random_* Compatibility Library
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* for using the new PHP 7 random_* API in PHP 5 projects
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/**
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* Fetch a random integer between $min and $max inclusive
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*
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* @param int $min
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* @param int $max
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*
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* @throws Exception
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*
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* @return int
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*/
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function random_int($min, $max)
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{
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/**
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* Type and input logic checks
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*
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* If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
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* (non-inclusive), it will sanely cast it to an int. If you it's equal to
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* ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
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* lose precision, so the <= and => operators might accidentally let a float
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* through.
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*/
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try {
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/** @var int $min */
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$min = RandomCompat_intval($min);
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} catch (TypeError $ex) {
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throw new TypeError(
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'random_int(): $min must be an integer'
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);
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}
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try {
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/** @var int $max */
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$max = RandomCompat_intval($max);
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} catch (TypeError $ex) {
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throw new TypeError(
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'random_int(): $max must be an integer'
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);
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}
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/**
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* Now that we've verified our weak typing system has given us an integer,
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* let's validate the logic then we can move forward with generating random
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* integers along a given range.
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*/
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if ($min > $max) {
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throw new Error(
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'Minimum value must be less than or equal to the maximum value'
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);
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}
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if ($max === $min) {
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return (int) $min;
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}
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/**
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* Initialize variables to 0
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*
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* We want to store:
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* $bytes => the number of random bytes we need
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* $mask => an integer bitmask (for use with the &) operator
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* so we can minimize the number of discards
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*/
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$attempts = $bits = $bytes = $mask = $valueShift = 0;
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/** @var int $attempts */
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/** @var int $bits */
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/** @var int $bytes */
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/** @var int $mask */
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/** @var int $valueShift */
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/**
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* At this point, $range is a positive number greater than 0. It might
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* overflow, however, if $max - $min > PHP_INT_MAX. PHP will cast it to
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* a float and we will lose some precision.
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*
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* @var int|float $range
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*/
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$range = $max - $min;
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/**
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* Test for integer overflow:
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*/
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if (!is_int($range)) {
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/**
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* Still safely calculate wider ranges.
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* Provided by @CodesInChaos, @oittaa
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*
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* @ref https://gist.github.com/CodesInChaos/03f9ea0b58e8b2b8d435
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*
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* We use ~0 as a mask in this case because it generates all 1s
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*
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* @ref https://eval.in/400356 (32-bit)
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* @ref http://3v4l.org/XX9r5 (64-bit)
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*/
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$bytes = PHP_INT_SIZE;
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/** @var int $mask */
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$mask = ~0;
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} else {
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/**
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* $bits is effectively ceil(log($range, 2)) without dealing with
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* type juggling
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*/
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while ($range > 0) {
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if ($bits % 8 === 0) {
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++$bytes;
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}
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++$bits;
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$range >>= 1;
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/** @var int $mask */
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$mask = $mask << 1 | 1;
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}
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$valueShift = $min;
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}
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/** @var int $val */
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$val = 0;
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/**
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* Now that we have our parameters set up, let's begin generating
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* random integers until one falls between $min and $max
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*/
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/** @psalm-suppress RedundantCondition */
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do {
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/**
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* The rejection probability is at most 0.5, so this corresponds
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* to a failure probability of 2^-128 for a working RNG
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*/
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if ($attempts > 128) {
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throw new Exception(
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'random_int: RNG is broken - too many rejections'
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);
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}
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/**
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* Let's grab the necessary number of random bytes
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*/
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$randomByteString = random_bytes($bytes);
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/**
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* Let's turn $randomByteString into an integer
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*
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* This uses bitwise operators (<< and |) to build an integer
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* out of the values extracted from ord()
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*
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* Example: [9F] | [6D] | [32] | [0C] =>
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* 159 + 27904 + 3276800 + 201326592 =>
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* 204631455
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*/
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$val &= 0;
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for ($i = 0; $i < $bytes; ++$i) {
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$val |= ord($randomByteString[$i]) << ($i * 8);
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}
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/** @var int $val */
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/**
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* Apply mask
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*/
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$val &= $mask;
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$val += $valueShift;
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++$attempts;
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/**
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* If $val overflows to a floating point number,
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* ... or is larger than $max,
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* ... or smaller than $min,
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* then try again.
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*/
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} while (!is_int($val) || $val > $max || $val < $min);
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return (int) $val;
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}
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}
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