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<?php |
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declare(strict_types = 1); |
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namespace ASN1\Type\Primitive; |
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use ASN1\Element; |
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use ASN1\Component\Identifier; |
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use ASN1\Component\Length; |
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use ASN1\Feature\ElementBase; |
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use ASN1\Type\PrimitiveType; |
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use ASN1\Type\UniversalClass; |
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use ASN1\Util\BigInt; |
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/** |
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* Implements <i>INTEGER</i> type. |
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*/ |
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class Integer extends Element |
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{ |
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use UniversalClass; |
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use PrimitiveType; |
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/** |
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* The number. |
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* |
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* @var BigInt |
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*/ |
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private $_number; |
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/** |
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* Constructor. |
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* |
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* @param int|string $number Base 10 integer |
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*/ |
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public function __construct($number) |
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{ |
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$this->_typeTag = self::TYPE_INTEGER; |
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if (!self::_validateNumber($number)) { |
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$var = is_scalar($number) ? strval($number) : gettype($number); |
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throw new \InvalidArgumentException("'$var' is not a valid number."); |
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} |
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$this->_number = new BigInt($number); |
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} |
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/** |
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* Get the number as a base 10. |
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* |
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* @return string Integer as a string |
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*/ |
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public function number(): string |
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{ |
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return $this->_number->base10(); |
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} |
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/** |
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* Get the number as an integer type. |
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* |
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* @return int |
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*/ |
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public function intNumber(): int |
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{ |
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return $this->_number->intVal(); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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*/ |
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protected function _encodedContentDER(): string |
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{ |
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$num = $this->_number->gmpObj(); |
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switch (gmp_sign($num)) { |
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// positive |
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case 1: |
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return self::_encodePositiveInteger($num); |
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// negative |
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case -1: |
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return self::_encodeNegativeInteger($num); |
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} |
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// zero |
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return "\0"; |
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} |
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/** |
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* Encode positive integer to DER content. |
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* |
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* @param \GMP|resource $num |
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* @return string |
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*/ |
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private static function _encodePositiveInteger(\GMP $num): string |
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{ |
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$bin = gmp_export($num, 1, GMP_MSW_FIRST | GMP_BIG_ENDIAN); |
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// if first bit is 1, prepend full zero byte |
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// to represent positive two's complement |
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if (ord($bin[0]) & 0x80) { |
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$bin = chr(0x00) . $bin; |
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} |
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return $bin; |
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} |
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/** |
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* Encode negative integer to DER content. |
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* |
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* @param \GMP|resource $num |
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* @return string |
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*/ |
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private static function _encodeNegativeInteger(\GMP $num): string |
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{ |
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$num = gmp_abs($num); |
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// compute number of bytes required |
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$width = 1; |
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if ($num > 128) { |
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$tmp = $num; |
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do { |
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$width++; |
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$tmp >>= 8; |
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} while ($tmp > 128); |
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} |
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// compute two's complement 2^n - x |
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$num = gmp_pow("2", 8 * $width) - $num; |
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$bin = gmp_export($num, 1, GMP_MSW_FIRST | GMP_BIG_ENDIAN); |
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// if first bit is 0, prepend full inverted byte |
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// to represent negative two's complement |
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if (!(ord($bin[0]) & 0x80)) { |
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$bin = chr(0xff) . $bin; |
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} |
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return $bin; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @return self |
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*/ |
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protected static function _decodeFromDER(Identifier $identifier, string $data, |
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int &$offset): ElementBase |
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{ |
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$idx = $offset; |
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$length = Length::expectFromDER($data, $idx)->intLength(); |
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$bytes = substr($data, $idx, $length); |
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$idx += $length; |
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$neg = ord($bytes[0]) & 0x80; |
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// negative, apply inversion of two's complement |
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if ($neg) { |
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$len = strlen($bytes); |
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for ($i = 0; $i < $len; $i++) { |
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$bytes[$i] = ~$bytes[$i]; |
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} |
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} |
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$num = gmp_init(bin2hex($bytes), 16); |
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// negative, apply addition of two's complement |
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// and produce negative result |
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if ($neg) { |
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$num = gmp_neg($num + 1); |
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} |
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$offset = $idx; |
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// late static binding since enumerated extends integer type |
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return new static(gmp_strval($num, 10)); |
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} |
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/** |
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* Test that number is valid for this context. |
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* |
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* @param mixed $num |
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* @return bool |
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*/ |
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private static function _validateNumber($num): bool |
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{ |
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if (is_int($num)) { |
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return true; |
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} |
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if (is_string($num) && preg_match('/-?\d+/', $num)) { |
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return true; |
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} |
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return false; |
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} |
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} |
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sop /
asn1
