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114 lines
2.8 KiB
PHP
114 lines
2.8 KiB
PHP
<?php
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namespace MiniFAIR\PLC\Util;
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use Exception;
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const BASE32_BITS_5_RIGHT = 31;
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const BASE32_CHARS = 'abcdefghijklmnopqrstuvwxyz234567';
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/**
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* Encode a binary string into a base64url string.
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*
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* @see https://datatracker.ietf.org/doc/html/rfc4648#section-5
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*
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* @param string $data The binary string to encode.
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* @return string The base64url encoded string.
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*/
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function base64url_encode( string $data ) : string {
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return rtrim( strtr( base64_encode( $data ), '+/', '-_' ), '=' );
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}
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/**
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* Decode a base64url string into a binary string.
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*
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* @see https://datatracker.ietf.org/doc/html/rfc4648#section-5
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*
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* @param string $data The base64url string to decode.
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* @return string The decoded binary string.
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*/
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function base64url_decode( string $data ) : string {
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$translated = strtr( $data, '-_', '+/' );
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$padded = str_pad( $translated, strlen( $data ) % 4, '=', STR_PAD_RIGHT );
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return base64_decode( $padded );
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}
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/**
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* Encode a binary string into a base32 string.
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*
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* @copyright 2016 Denis Borzenko
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* @license https://github.com/bbars/utils/blob/master/LICENSE MIT
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* @see https://github.com/bbars/utils
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*/
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function base32_encode($data, $padRight = false) {
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$dataSize = strlen($data);
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$res = '';
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$remainder = 0;
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$remainderSize = 0;
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for ($i = 0; $i < $dataSize; $i++)
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{
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$b = ord($data[$i]);
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$remainder = ($remainder << 8) | $b;
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$remainderSize += 8;
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while ($remainderSize > 4)
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{
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$remainderSize -= 5;
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$c = $remainder & (BASE32_BITS_5_RIGHT << $remainderSize);
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$c >>= $remainderSize;
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$res .= BASE32_CHARS[$c];
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}
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}
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if ($remainderSize > 0)
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{
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// remainderSize < 5:
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$remainder <<= (5 - $remainderSize);
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$c = $remainder & BASE32_BITS_5_RIGHT;
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$res .= BASE32_CHARS[$c];
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}
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if ($padRight)
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{
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$padSize = (8 - ceil(($dataSize % 5) * 8 / 5)) % 8;
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$res .= str_repeat('=', $padSize);
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}
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return $res;
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}
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/**
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* Decode a binary string into a base32 string.
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*
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* @copyright 2016 Denis Borzenko
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* @license https://github.com/bbars/utils/blob/master/LICENSE MIT
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* @see https://github.com/bbars/utils
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*/
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function base32_decode($data) {
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$data = rtrim($data, "=\x20\t\n\r\0\x0B");
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$dataSize = strlen($data);
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$buf = 0;
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$bufSize = 0;
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$res = '';
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$charMap = array_flip(str_split(BASE32_CHARS)); // char=>value map
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$charMap += array_flip(str_split(strtoupper(BASE32_CHARS))); // add upper-case alternatives
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for ($i = 0; $i < $dataSize; $i++)
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{
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$c = $data[$i];
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if (!isset($charMap[$c]))
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{
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if ($c == " " || $c == "\r" || $c == "\n" || $c == "\t")
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continue; // ignore these safe characters
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throw new Exception('Encoded string contains unexpected char #'.ord($c)." at offset $i (using improper alphabet?)");
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}
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$b = $charMap[$c];
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$buf = ($buf << 5) | $b;
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$bufSize += 5;
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if ($bufSize > 7)
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{
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$bufSize -= 8;
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$b = ($buf & (0xff << $bufSize)) >> $bufSize;
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$res .= chr($b);
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}
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}
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return $res;
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}
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