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103 lines
2.3 KiB
PHP
103 lines
2.3 KiB
PHP
<?php
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/**
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* A port of yocLIB Multibase Base58 encoding/decoding by Yocto.
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*
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* Original source: https://github.com/yocto/yoclib-multibase-php
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* License: GPL-3.0
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*/
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namespace FAIR\Updater;
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/**
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* Base58BTC encoding and decoding.
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*/
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class Base58BTC {
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const PREFIX = 'z';
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const ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
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/**
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* @param array $source
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* @param int $sourceBase
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* @param int $targetBase
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* @return array
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*/
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private static function convertBase(array $source, int $sourceBase, int $targetBase): array{
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$result = [];
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while ($count = count($source)) {
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$quotient = [];
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$remainder = 0;
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for ($i = 0; $i !== $count; $i++) {
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$accumulator = $source[$i] + $remainder * $sourceBase;
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/* Same as PHP 7 intdiv($accumulator, $targetBase) */
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$digit = ($accumulator - ($accumulator % $targetBase)) / $targetBase;
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$remainder = $accumulator % $targetBase;
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if (count($quotient) || $digit) {
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$quotient[] = $digit;
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}
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}
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array_unshift($result, $remainder);
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$source = $quotient;
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}
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return $result;
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}
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/**
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* @param string $data
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* @param string $alphabet
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* @return string
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*/
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public static function decode(string $data): string{
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$data = str_split($data);
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if ($data[0] === self::PREFIX) {
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array_shift($data);
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}
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$data = array_map(static function($character) {
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return strpos(self::ALPHABET,$character);
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}, $data);
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$leadingZeroes = 0;
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while (!empty($data) && 0 === $data[0]) {
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$leadingZeroes++;
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array_shift($data);
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}
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$converted = self::convertBase($data, 58, 256);
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if (0 < $leadingZeroes) {
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$converted = array_merge(
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array_fill(0, $leadingZeroes, 0),
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$converted
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);
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}
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return implode("", array_map("chr", $converted));
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}
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public static function encode(string $data,string $alphabet): string{
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$data = str_split($data);
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$data = array_map("ord", $data);
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$leadingZeroes = 0;
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while (!empty($data) && 0 === $data[0]) {
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$leadingZeroes++;
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array_shift($data);
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}
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$converted = self::convertBase($data, 256, 58);
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if (0 < $leadingZeroes) {
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$converted = array_merge(
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array_fill(0, $leadingZeroes, 0),
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$converted
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);
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}
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return implode('',array_map(static function($index) use($alphabet){
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return $alphabet[$index];
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},$converted));
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}
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}
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