1 <?php

     1 <?php

     2 /**

     2 /**

     4  * for using the new PHP 7 random_* API in PHP 5 projects

     4  * for using the new PHP 7 random_* API in PHP 5 projects

     6  * The MIT License (MIT)

     6  * The MIT License (MIT)

     7  *

     7  *

    10  * Permission is hereby granted, free of charge, to any person obtaining a copy

    10  * Permission is hereby granted, free of charge, to any person obtaining a copy

    11  * of this software and associated documentation files (the "Software"), to deal

    11  * of this software and associated documentation files (the "Software"), to deal

    12  * in the Software without restriction, including without limitation the rights

    12  * in the Software without restriction, including without limitation the rights

    13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    14  * copies of the Software, and to permit persons to whom the Software is

    14  * copies of the Software, and to permit persons to whom the Software is

    15  * furnished to do so, subject to the following conditions:

    15  * furnished to do so, subject to the following conditions:

    17  * The above copyright notice and this permission notice shall be included in

    17  * The above copyright notice and this permission notice shall be included in

    18  * all copies or substantial portions of the Software.

    18  * all copies or substantial portions of the Software.

    20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    41      * @return string

    41      * @return string

    42      */

    42      */

    43     function random_bytes($bytes)

    43     function random_bytes($bytes)

    44     {

    44     {

    45         try {

    45         try {

    46             $bytes = RandomCompat_intval($bytes);

    47             $bytes = RandomCompat_intval($bytes);

    47         } catch (TypeError $ex) {

    48         } catch (TypeError $ex) {

    48             throw new TypeError(

    49             throw new TypeError(

    49                 'random_bytes(): $bytes must be an integer'

    50                 'random_bytes(): $bytes must be an integer'

    50             );

    51             );

    58 

    59 

    59         /**

    60         /**

    60          * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be

    61          * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be

    61          * generated in one invocation.

    62          * generated in one invocation.

    62          */

    63          */

    63         if ($bytes > 2147483647) {

    65         if ($bytes > 2147483647) {

    64             $buf = '';

    66             $buf = '';

    65             for ($i = 0; $i < $bytes; $i += 1073741824) {

    67             for ($i = 0; $i < $bytes; $i += 1073741824) {

    66                 $n = ($bytes - $i) > 1073741824

    68                 $n = ($bytes - $i) > 1073741824

    67                     ? 1073741824

    69                     ? 1073741824

    68                     : $bytes - $i;

    70                     : $bytes - $i;

    69                 $buf .= \Sodium\randombytes_buf($n);

    71                 $buf .= \Sodium\randombytes_buf($n);

    70             }

    72             }

    71         } else {

    73         } else {

    72             $buf = \Sodium\randombytes_buf($bytes);

    75             $buf = \Sodium\randombytes_buf($bytes);

    73         }

    76         }

    74 

    77 

    76             if (RandomCompat_strlen($buf) === $bytes) {

    79             if (RandomCompat_strlen($buf) === $bytes) {

    77                 return $buf;

    80                 return $buf;

    78             }

    81             }

    79         }

    82         }

    80 

    83