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<?php |
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namespace MadWizard\WebAuthn\Format; |
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use MadWizard\WebAuthn\Exception\CborException; |
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final class CborEncoder |
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{ |
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public static function encodeInteger(int $i): string |
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{ |
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if ($i < 0) { |
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$i = -($i + 1); |
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$major = Cbor::MAJOR_NEGATIVE_INT; |
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} else { |
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$major = Cbor::MAJOR_UNSIGNED_INT; |
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} |
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$bytes = self::integerBytes($i, $minorVal); |
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return chr(($major << 5) | $minorVal) . $bytes; |
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} |
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public static function encodeTextString(string $text): string |
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{ |
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$lengthBytes = self::integerBytes(\strlen($text), $minorVal); |
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return chr((Cbor::MAJOR_TEXT_STRING << 5) | $minorVal) . $lengthBytes . $text; |
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} |
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public static function encodeByteString(ByteBuffer $bytes): string |
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{ |
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$lengthBytes = self::integerBytes($bytes->getLength(), $minorVal); |
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return chr((Cbor::MAJOR_BYTE_STRING << 5) | $minorVal) . $lengthBytes . $bytes->getBinaryString(); |
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} |
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private static function sortAndEncodeMapEntries(array $map): string |
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{ |
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// Use canonical sorting. Shorter keys (as CBOR bytes) always go before longer keys. When length is the same |
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// a byte for byte comparison is done. |
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uksort($map, function (string $key1, string $key2) { |
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$cmp = \strlen($key1) <=> \strlen($key2); |
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return ($cmp === 0) ? ($key1 <=> $key2) : $cmp; |
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}); |
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$mapContent = ''; |
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foreach ($map as $k => $v) { |
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$mapContent .= $k . $v; |
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} |
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$lengthBytes = self::integerBytes(count($map), $minorVal); |
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return chr((Cbor::MAJOR_MAP << 5) | $minorVal) . $lengthBytes . $mapContent; |
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} |
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public static function encodeMap(CborMap $map): string |
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{ |
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$mapValues = []; |
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foreach ($map->getEntries() as $entry) { |
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$mapValues[self::encodeSingleValue($entry[0])] = self::encodeSingleValue($entry[1]); |
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} |
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return self::sortAndEncodeMapEntries($mapValues); |
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} |
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private static function integerBytes(int $i, ?int &$minorVal): string |
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{ |
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if ($i < 24) { |
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$minorVal = $i; |
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return ''; |
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} |
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if ($i < 2 ** 8) { |
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$minorVal = 24; |
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return pack('C', $i); |
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} |
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if ($i < 2 ** 16) { |
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$minorVal = 25; |
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return pack('n', $i); |
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} |
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if (PHP_INT_SIZE < 8 || $i < 2 ** 32) { |
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$minorVal = 26; |
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return pack('N', $i); |
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} |
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$minorVal = 27; |
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return pack('J', $i); |
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} |
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/** |
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* @param int|string|ByteBuffer|CborMap|bool|null $value |
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* |
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* @throws CborException |
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*/ |
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public static function encodeSingleValue($value): string |
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{ |
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if (\is_int($value)) { |
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return self::encodeInteger($value); |
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} |
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if (\is_string($value)) { |
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return self::encodeTextString($value); |
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} |
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if ($value instanceof ByteBuffer) { |
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return self::encodeByteString($value); |
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} |
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if ($value instanceof CborMap) { |
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return self::encodeMap($value); |
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} |
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if ($value === false) { |
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return chr(0xF4); |
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} |
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1 |
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if ($value === true) { |
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return chr(0xF5); |
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} |
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if ($value === null) { |
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return chr(0xF6); |
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} |
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// @phpstan-ignore-next-line |
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throw new CborException(sprintf('Unsupported type "%s" for encodeSingleValue', gettype($value))); |
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} |
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} |
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madwizard-org /
webauthn-server
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