40 lines
879 B
PHP
40 lines
879 B
PHP
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<?php
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define('MSZ_BASE32_CHARS', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567');
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function base32_decode(string $string): string
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{
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$out = '';
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$length = strlen($string);
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$char = $shift = 0;
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for ($i = 0; $i < $length; $i++) {
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$char <<= 5;
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$char += stripos(MSZ_BASE32_CHARS, $string[$i]);
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$shift = ($shift + 5) % 8;
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$out .= $shift < 5 ? chr(($char & (0xFF << $shift)) >> $shift) : '';
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}
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return $out;
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}
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function base32_encode(string $data): string
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{
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$bin = '';
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$encoded = '';
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$length = strlen($data);
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for ($i = 0; $i < $length; $i++) {
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$bin .= sprintf('%08b', ord($data[$i]));
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}
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$bin = str_split($bin, 5);
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$last = array_pop($bin);
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$bin[] = str_pad($last, 5, '0', STR_PAD_RIGHT);
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foreach ($bin as $part) {
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$encoded .= MSZ_BASE32_CHARS[bindec($part)];
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}
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return $encoded;
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}
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