meshachviktor / secure-random
A simple library for securely generating random values.
Requires
- php: ^7.2 || ^8.0
This package is not auto-updated.
Last update: 2024-11-04 14:25:51 UTC
README
This library was originally built with resources from Arteri Africa.
Introduction
SecureRandom is a library designed for generating random values. With SecureRandom you can generate the following types of values:
- Raw bytes
- Floating point numbers
- Integers
- Hexadecimal strings
- Alphanumeric strings (mixed case)
- Universally Unique Identifiers (Version 4)
All values generated by SecureRandom come from cryptographically secure sources. Integers and Floating point numbers generated by SecureRandom are sourced from PHP's random_int() function. All other types are sourced from the random_bytes() function. These functions, according to the PHP documentation, are suitable for cryptographic use as the values they produce are from a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). The randomness of the values generated by these functions consequentially applies to the values generated by SecureRandom.
SecureRandom is useful for generating the following:
- One-Time passwords
- Temporary/default passwords
- Two-Factor Authentication (2FA) codes
- API keys
- Password salts
- File names
The list above is not exhaustive. You can use SecureRandom for a lot more.
Usage
To use SecureRandom add the dependency to your project using the following composer command.
composer require meshachviktor/secure-random
Then import the library to your project as shown below.
use Meshachviktor\SecureRandom\SecureRandom;
Generating random bytes
You can generate random bytes using the library by calling the bytes() method.
SecureRandom::bytes(int $length) :string
This method takes an optional integer argument named $length. By default $length has a value of 64 but can be any number between the range of 1 and 64 (inclusive). Supplying a value less than 1 or greater than 64 will result in the method throwing \RangeException. The bytes() method is limited to returning a maximum of 64 bytes due to a lot of reasons. If you need more than 64 bytes use PHP's built in random_bytes() instead.
Examples
$bytes = SecureRandom::bytes(); // Returns 64 bytes. $bytes = SecureRandom::bytes(1); // Returns 1 byte. $bytes = SecureRandom::bytes(32); // Returns 32 bytes. $bytes = SecureRandom::bytes(0); // Throws \RangeException $bytes = SecureRandom::bytes(65); // Throws \RangeException
Generating random floats
The library provides some methods for generating random floating point numbers. The fractional part of all floating point numbers generated are limited to a maximum of 14 decimal digits. All numbers returned by these methods are less than 1. Negative values are in the range of -0.99999999999999 to -0.1 while positive values are in the range of 0.1 to 0.99999999999999.
SecureRandom::float(int $fractional_digits = 14) :float
The float() method returns a random positive or negative floating point number. The method takes an optional integer argument, $fractional_digits, whose value defaults to 14. The value of $fractional_digits determines how many decimal digits will appear after the decimal point of the floating point number generated. Supplying a value less than 1 or greater than 14 causes the method to throw \RangeException.
Examples
$float = SecureRandom::float(); // 0.13456788654122 $float = SecureRandom::float(2); // 0.41 $float = SecureRandom::float(10); // -0.5774096379 $float = SecureRandom::float(0); // Throws \RangeException $float = SecureRandom::float(15); // Throws \RangeException
SecureRandom::positiveFloat(int $fractional_digits = 14) :float
The positiveFloat() method returns a random positive floating point number. The method takes an optional integer argument, $fractional_digits, whose value defaults to 14. The value of $fractional_digits determines how many decimal digits will appear after the decimal point of the floating point number generated. Supplying a value less than 1 or greater than 14 causes the method to throw \RangeException.
Examples
$float = SecureRandom::positiveFloat(); // 0.92120198810972 $float = SecureRandom::positiveFloat(2); // 0.12 $float = SecureRandom::positiveFloat(10); // 0.7222526563 $float = SecureRandom::positiveFloat(0); // Throws \RangeException $float = SecureRandom::positiveFloat(15); // Throws \RangeException
SecureRandom::negativeFloat(int $fractional_digits = 14) :float
The negativeFloat() method returns a random negative floating point number. The method takes an optional integer argument, $fractional_digits, whose value defaults to 14. The value of $fractional_digits determines how many decimal digits will appear after the decimal point of the floating point number generated. Supplying a value less than 1 or greater than 14 causes the method to throw \RangeException.
Examples
$float = SecureRandom::negativeFloat(); // -0.13456788654122 $float = SecureRandom::negativeFloat(2); // -0.41 $float = SecureRandom::negativeFloat(10); // -0.5774096379 $float = SecureRandom::negativeFloat(0); // Throws \RangeException $float = SecureRandom::negativeFloat(15); // Throws \RangeException
SecureRandom::floatBetween(float $min, float $max) :float
The floatBetween() method takes two float arguments $min and $max and returns a floating point number between the range of $min and $max (inclusive). The method accepts only positive float values and as a results only returns positive values. The method will throw \RangeException if the value of $min or $max is outside of the range 0.1 and 0.99999999999999. The method will also throw Meshachviktor\SecureRandom\Exception\ValueException if the value of $min is greater than the value of $max.
Examples
$float = SecureRandom::floatBetween(0.1, 0.2); // 0.16708918081238 $float = SecureRandom::floatBetween(0.7777, 0.8888); // 0.8713798653067 $float = SecureRandom::floatBetween(0.25555555, 0.9999999999999999); // Throws \RangeException $float = SecureRandom::floatBetween(0.3, 0.2); // Throws ValueException
Important note
Due to the effect of rounding, the fractional parts of values returned by methods that generate floats will sometimes be one less than the value of $fractional_digits.
Generating random integers
The library provides some functions for generating random integers. Values returned by these functions are between PHP_INT_MIN and PHP_INT_MAX (inclusive).
SecureRandom::integer() :int
The integer() method takes no argument and returns a value between PHP_INT_MIN and PHP_INT_MAX.
Examples
$integer = SecureRandom::integer(); // 3733559955175437818 $integer = SecureRandom::integer(); // -8615169409373723479 $integer = SecureRandom::integer(); // 898224759918621175 $integer = SecureRandom::integer(); // -4550407951101420676
SecureRandom::positiveInteger(int $length = 19) :int
The positiveInteger() method returns a random positive integer. The method takes an integer argument, $length, whose value defaults to 19. Supplying a value less than 1 or greater than 19 causes the method to throw \RangeException. The method returns an integer whose total number of digits equals the value of $length.
Examples
$integer = SecureRandom::positiveInteger(); // 2562604524331120248 (19 digits long by default) $integer = SecureRandom::positiveInteger(6); // 197955 (6 digits long) $integer = SecureRandom::positiveInteger(1); // 7 (1 digit long) $integer = SecureRandom::positiveInteger(0); // Throws \RangeException $integer = SecureRandom::positiveInteger(20); // Throws \RangeException
SecureRandom::negativeInteger(int $length = 19) :int
The negativeInteger() method returns a random negative integer. The method takes an integer argument, $length, whose value defaults to 19. Supplying a value less than 1 or greater than 19 causes the method to throw \RangeException. The method returns a negative integer whose total number of digits equals the value of $length.
Examples
$integer = SecureRandom::negativeInteger(); // -4259319387199823755 (19 digits long by default) $integer = SecureRandom::negativeInteger(6); // -808209 (6 digits long) $integer = SecureRandom::negativeInteger(1); // -5 (1 digit long) $integer = SecureRandom::negativeInteger(0); // Throws \RangeException $integer = SecureRandom::negativeInteger(20); // Throws \RangeException
SecureRandom::integerBetween(int $min, int $max) :int
The integerBetween() method takes two integer arguments $min and $max and returns an integer between the range of $min and $max (inclusive). The method will throw Meshachviktor\SecureRandom\Exception\ValueException if the value of $min is greater than the value of $max.
Examples
$integer = SecureRandom::integerBetween(1, 10); // 2 $integer = SecureRandom::integerBetween(1000, 5000); // 4124` $integer = SecureRandom::integerBetween(-300, -100); // -149 $integer = SecureRandom::integerBetween(-100, -300); // Throws ValueException
Generating random strings
The library provides some functions for generating random strings. There are three types of strings that can be generated.
- Hexadecimal strings.
- Mixed case alphanumeric strings
- Version 4 UUIDs
When generating hexadecimal strings and alphanumric strings the corresponding methods take a single integer argument, $length, which determines how long the generated string should be. The value of $lenth defaults to 64. \RangeException is thrown is the value of $length is less than 1 or if it is greater than 64.
The method that generates UUIDs takes no argument.
SecureRandom::hexadecimalString(int $length = 64) :string
Generates a hexadecimal string of given length.
Examples
$string = SecureRandom::hexadecimalString(8); // 5bc3aac3 $string = SecureRandom::hexadecimalString(16); // 6bc28f1fc391c386 $string = SecureRandom::hexadecimalString(0); // Throws \RangeException $string = SecureRandom::hexadecimalString(65); // Throws \RangeException
SecureRandom::alphanumericString(int $length = 64) :string
Generates an alphanumeric string of given length.
Examples
$string = SecureRandom::alphanumericString(8); // fxbjwCmi $string = SecureRandom::alphanumericString(16); // 84XxE8OY7CKQg0na $string = SecureRandom::alphanumericString(0); // Throws \RangeException $string = SecureRandom::alphanumericString(65); // Throws \RangeException
SecureRandom::uuid() : string
Generates version 4 UUIDs.
Examples
$uuid = SecureRandom::uuid(); // 105f4516-e80c-4c32-b2fe-42dafa85d9cd $uuid = SecureRandom::uuid(); // 54ef56c9-cae6-48c2-824f-6d8a2737a3d6
License
MIT