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Aide for base32 encoding and decoding

functions or class to allow encoding or decoding strings using RFC4648 base32 algorithm.

Caution

Sub-split of Aide for Base32.
⚠️ this is a sub-split, for pull requests and issues, visit: https://github.com/bakame-php/aide

Installation

Composer

composer require bakame-php/aide-base32

System Requirements

You need:

  • PHP >= 8.1 but the latest stable version of PHP is recommended

Usage

The package provides a userland base32 encoding and decoding mechanism.

base32_encode(string $decoded, string $alphabet = PHP_BASE32_ASCII, $padding = '='): string
base32_decode(string $encoded, string $alphabet = PHP_BASE32_ASCII, $padding = '=', bool $strict = false): string

Parameters:

  • $decoded : the data to encode for base32_encode
  • $encoded : the data to decode for base32_decode
  • $alphabet : the base32 alphabet, by default PHP_BASE32_ASCII.
  • $padding : the padding character

If $alphabet is PHP_BASE32_ASCII and the $padding is =, conversion is performed per RFC4648 US-ASCII standard. If $alphabet is PHP_BASE32_HEXC and the $padding is =, conversion is performed per RFC4648 HEX standard.

You can provide your own alphabet of 32 characters and your own padding character.

  • $strict : tell whether we need to perform strict decoding or not

If the strict parameter is set to true then the base32_decode() function will return false

  • if encoded sequence length is invalid
  • if the input contains character from outside the base64 alphabet.
  • if padding is invalid
  • if encoded characters do not follow the alphabet lettercase.

otherwise listed constraints are silently ignored or discarded.

<?php

base32_encode('Bangui');                                      // returns 'IJQW4Z3VNE======'
base32_decode('IJQW4Z3VNE======');                            // returns 'Bangui'
base32_decode('IJQW4Z083VNE======');                          // returns 'Bangui'
base32_decode('IJQW4Z083VNE======', PHP_BASE32_ASCII, true);  // return false
base32_encode('Bangui', PHP_BASE32_HEX, '*');                 // returns '89GMSPRLD4******'
base32_decode('89GMSPRLD4******', PHP_BASE32_HEX, '*', true); // returns 'Bangui'