355 lines
11 KiB
PHP
355 lines
11 KiB
PHP
<?php
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/*
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* base58.php
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*
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* PHP Base58 codec
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*
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* Based on https://github.com/MoneroPy/moneropy/base58.py and https://github.com/mymonero/mymonero-core-js/cryptonote_utils/cryptonote_base58.js
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*
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*/
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class base58 {
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/**
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* @var string
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*/
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static $alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
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static $encoded_block_sizes = [0, 2, 3, 5, 6, 7, 9, 10, 11];
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static $full_block_size = 8;
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static $full_encoded_block_size = 11;
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/**
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*
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* Convert a hexadecimal string to a binary array
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*
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* @param string $hex A hexadecimal string to convert to a binary array
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* @return array
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*
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*/
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private function hex_to_bin($hex) {
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if (gettype($hex) != 'string') {
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throw new Exception('base58->hex_to_bin(): Invalid input type (must be a string)');
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}
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if (strlen($hex) % 2 != 0) {
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throw new Exception('base58->hex_to_bin(): Invalid input length (must be even)');
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}
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$res = array_fill(0, strlen($hex) / 2, 0);
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for ($i = 0; $i < strlen($hex) / 2; $i++) {
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$res[$i] = intval(substr($hex, $i * 2, $i * 2 + 2 - $i * 2), 16);
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}
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return $res;
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}
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/**
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*
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* Convert a binary array to a hexadecimal string
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*
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* @param array $bin A binary array to convert to a hexadecimal string
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* @return string
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*
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*/
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private function bin_to_hex($bin) {
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if (gettype($bin) != 'array') {
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throw new Exception('base58->bin_to_hex(): Invalid input type (must be an array)');
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}
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$res = [];
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for ($i = 0; $i < count($bin); $i++) {
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$res[] = substr('0'.dechex($bin[$i]), -2);
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}
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return join($res);
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}
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/**
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*
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* Convert a string to a binary array
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*
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* @param string $str A string to convert to a binary array
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* @return array
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*
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*/
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private function str_to_bin($str) {
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if (gettype($str) != 'string') {
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throw new Exception('base58->str_to_bin(): Invalid input type (must be a string)');
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}
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$res = array_fill(0, strlen($str), 0);
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for ($i = 0; $i < strlen($str); $i++) {
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$res[$i] = ord($str[$i]);
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}
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return $res;
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}
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/**
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*
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* Convert a binary array to a string
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*
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* @param array $bin A binary array to convert to a string
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* @return string
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*
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*/
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private function bin_to_str($bin) {
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if (gettype($bin) != 'array') {
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throw new Exception('base58->bin_to_str(): Invalid input type (must be an array)');
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}
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$res = array_fill(0, count($bin), 0);
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for ($i = 0; $i < count($bin); $i++) {
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$res[$i] = chr($bin[$i]);
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}
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return preg_replace('/[[:^print:]]/', '', join($res)); // preg_replace necessary to strip errant non-ASCII characters eg. ''
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}
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/**
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*
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* Convert a UInt8BE (one unsigned big endian byte) array to UInt64
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*
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* @param array $data A UInt8BE array to convert to UInt64
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* @return number
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*
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*/
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private function uint8_be_to_64($data) {
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if (gettype($data) != 'array') {
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throw new Exception ('base58->uint8_be_to_64(): Invalid input type (must be an array)');
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}
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$res = 0;
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$i = 0;
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switch (9 - count($data)) {
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case 1:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 2:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 3:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 4:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 5:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 6:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 7:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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case 8:
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$res = bcadd(bcmul($res, bcpow(2, 8)), $data[$i++]);
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break;
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default:
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throw new Exception('base58->uint8_be_to_64: Invalid input length (1 <= count($data) <= 8)');
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}
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return $res;
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}
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/**
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*
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* Convert a UInt64 (unsigned 64 bit integer) to a UInt8BE array
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*
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* @param number $num A UInt64 number to convert to a UInt8BE array
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* @param integer $size Size of array to return
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* @return array
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*
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*/
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private function uint64_to_8_be($num, $size) {
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if (gettype($num) != ('integer' || 'double')) {
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throw new Exception ('base58->uint64_to_8_be(): Invalid input type ($num must be a number)');
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}
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if (gettype($size) != 'integer') {
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throw new Exception ('base58->uint64_to_8_be(): Invalid input type ($size must be an integer)');
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}
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if ($size < 1 || $size > 8) {
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throw new Exception ('base58->uint64_to_8_be(): Invalid size (1 <= $size <= 8)');
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}
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$res = array_fill(0, $size, 0);
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for ($i = $size - 1; $i >= 0; $i--) {
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$res[$i] = bcmod($num, bcpow(2, 8));
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$num = bcdiv($num, bcpow(2, 8));
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}
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return $res;
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}
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/**
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*
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* Convert a hexadecimal (Base16) array to a Base58 string
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*
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* @param array $data
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* @param array $buf
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* @param number $index
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* @return array
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*
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*/
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private function encode_block($data, $buf, $index) {
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if (gettype($data) != 'array') {
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throw new Exception('base58->encode_block(): Invalid input type ($data must be an array)');
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}
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if (gettype($buf) != 'array') {
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throw new Exception('base58->encode_block(): Invalid input type ($buf must be an array)');
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}
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if (gettype($index) != ('integer' || 'double')) {
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throw new Exception('base58->encode_block(): Invalid input type ($index must be a number)');
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}
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if (count($data) < 1 or count($data) > self::$full_encoded_block_size) {
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throw new Exception('base58->encode_block(): Invalid input length (1 <= count($data) <= 8)');
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}
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$num = self::uint8_be_to_64($data);
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$i = self::$encoded_block_sizes[count($data)] - 1;
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while ($num > 0) {
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$remainder = bcmod($num, 58);
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$num = bcdiv($num, 58);
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$buf[$index + $i] = ord(self::$alphabet[$remainder]);
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$i--;
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}
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return $buf;
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}
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/**
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*
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* Encode a hexadecimal (Base16) string to Base58
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*
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* @param string $hex A hexadecimal (Base16) string to convert to Base58
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* @return string
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*
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*/
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public function encode($hex) {
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if (gettype($hex) != 'string') {
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throw new Exception ('base58->encode(): Invalid input type (must be a string)');
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}
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$data = self::hex_to_bin($hex);
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if (count($data) == 0) {
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return '';
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}
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$full_block_count = floor(count($data) / self::$full_block_size);
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$last_block_size = count($data) % self::$full_block_size;
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$res_size = $full_block_count * self::$full_encoded_block_size + self::$encoded_block_sizes[$last_block_size];
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$res = array_fill(0, $res_size, 0);
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for ($i = 0; $i < $res_size; $i++) {
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$res[$i] = self::$alphabet[0];
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}
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for ($i = 0; $i < $full_block_count; $i++) {
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$res = self::encode_block(array_slice($data, $i * self::$full_block_size, ($i * self::$full_block_size + self::$full_block_size) - ($i * self::$full_block_size)), $res, $i * self::$full_encoded_block_size);
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}
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if ($last_block_size > 0) {
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$res = self::encode_block(array_slice($data, $full_block_count * self::$full_block_size, $full_block_count * self::$full_block_size + $last_block_size), $res, $full_block_count * self::$full_encoded_block_size);
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}
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return self::bin_to_str($res);
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}
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/**
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*
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* Convert a Base58 input to hexadecimal (Base16)
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*
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* @param array $data
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* @param array $buf
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* @param integer $index
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* @return array
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*
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*/
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private function decode_block($data, $buf, $index) {
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if (gettype($data) != 'array') {
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throw new Exception('base58->decode_block(): Invalid input type ($data must be an array)');
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}
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if (gettype($buf) != 'array') {
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throw new Exception('base58->decode_block(): Invalid input type ($buf must be an array)');
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}
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if (gettype($index) != ('integer' || 'double')) {
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throw new Exception('base58->decode_block(): Invalid input type ($index must be a number)');
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}
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$res_size = self::index_of(self::$encoded_block_sizes, count($data));
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if ($res_size <= 0) {
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throw new Exception('base58->decode_block(): Invalid input length ($data must be a value from base58::$encoded_block_sizes)');
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}
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$res_num = 0;
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$order = 1;
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for ($i = count($data) - 1; $i >= 0; $i--) {
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$digit = strpos(self::$alphabet, chr($data[$i]));
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if ($digit < 0) {
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throw new Exception("base58->decode_block(): Invalid character ($digit \"{$digit}\" not found in base58::$alphabet)");
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}
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$product = bcadd(bcmul($order, $digit), $res_num);
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if ($product > bcpow(2, 64)) {
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throw new Exception('base58->decode_block(): Integer overflow ($product exceeds the maximum 64bit integer)');
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}
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$res_num = $product;
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$order = bcmul($order, 58);
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}
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if ($res_size < self::$full_block_size && bcpow(2, 8 * $res_size) <= 0) {
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throw new Exception('base58->decode_block(): Integer overflow (bcpow(2, 8 * $res_size) exceeds the maximum 64bit integer)');
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}
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$tmp_buf = self::uint64_to_8_be($res_num, $res_size);
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for ($i = 0; $i < count($tmp_buf); $i++) {
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$buf[$i + $index] = $tmp_buf[$i];
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}
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return $buf;
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}
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/**
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*
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* Decode a Base58 string to hexadecimal (Base16)
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*
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* @param string $hex A Base58 string to convert to hexadecimal (Base16)
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* @return string
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*
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*/
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public function decode($enc) {
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if (gettype($enc) != 'string') {
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throw new Exception ('base58->decode(): Invalid input type (must be a string)');
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}
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$enc = self::str_to_bin($enc);
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if (count($enc) == 0) {
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return '';
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}
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$full_block_count = floor(bcdiv(count($enc), self::$full_encoded_block_size));
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$last_block_size = bcmod(count($enc), self::$full_encoded_block_size);
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$last_block_decoded_size = self::index_of(self::$encoded_block_sizes, $last_block_size);
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$data_size = $full_block_count * self::$full_block_size + $last_block_decoded_size;
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$data = array_fill(0, $data_size, 0);
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for ($i = 0; $i <= $full_block_count; $i++) {
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$data = self::decode_block(array_slice($enc, $i * self::$full_encoded_block_size, ($i * self::$full_encoded_block_size + self::$full_encoded_block_size) - ($i * self::$full_encoded_block_size)), $data, $i * self::$full_block_size);
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}
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if ($last_block_size > 0) {
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$data = self::decode_block(array_slice($enc, $full_block_count * self::$full_encoded_block_size, $full_block_count * self::$full_encoded_block_size + $last_block_size), $data, $full_block_count * self::$full_block_size);
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}
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return self::bin_to_hex($data);
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}
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/**
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*
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* Search an array for a value
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* Source: https://stackoverflow.com/a/30994678
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*
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* @param array $haystack An array to search
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* @param string $needle A string to search for
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* @return number The index of the element found (or -1 for no match)
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*
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*/
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private function index_of($haystack, $needle) {
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if (gettype($haystack) != 'array') {
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throw new Exception ('base58->decode(): Invalid input type ($haystack must be an array)');
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}
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// if (gettype($needle) != 'string') {
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// throw new Exception ('base58->decode(): Invalid input type ($needle must be a string)');
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// }
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foreach ($haystack as $key => $value) if ($value === $needle) return $key;
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return -1;
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}
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}
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?>
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