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<?php |
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declare(strict_types = 1); |
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namespace Sop\CryptoTypes\Asymmetric\EC; |
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use Sop\ASN1\Type\Primitive\BitString; |
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use Sop\ASN1\Type\Primitive\Integer; |
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use Sop\ASN1\Type\Primitive\OctetString; |
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/** |
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* Implements data type conversions from SEC 1: Elliptic Curve Cryptography. |
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* |
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* @see http://www.secg.org/sec1-v2.pdf |
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*/ |
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class ECConversion |
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{ |
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/** |
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* Perform Bit-String-to-Octet-String Conversion. |
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* |
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* Defined in SEC 1 section 2.3.1. |
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* |
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* @param BitString $bs |
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* |
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* @throws \RuntimeException |
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* |
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* @return OctetString |
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*/ |
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public static function bitStringToOctetString(BitString $bs): OctetString |
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{ |
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$str = $bs->string(); |
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if ($bs->unusedBits()) { |
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// @todo pad string |
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throw new \RuntimeException('Unaligned bitstrings to supported'); |
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} |
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return new OctetString($str); |
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} |
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/** |
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* Perform Octet-String-to-Bit-String Conversion. |
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* |
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* Defined in SEC 1 section 2.3.2. |
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* |
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* @param OctetString $os |
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* |
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* @return BitString |
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*/ |
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public static function octetStringToBitString(OctetString $os): BitString |
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{ |
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return new BitString($os->string()); |
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} |
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/** |
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* Perform Integer-to-Octet-String Conversion. |
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* |
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* Defined in SEC 1 section 2.3.7. |
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* |
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* @param Integer $num |
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* @param null|int $mlen Optional desired output length |
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* |
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* @throws \UnexpectedValueException |
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* |
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* @return OctetString |
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*/ |
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public static function integerToOctetString(Integer $num, ?int $mlen = null): OctetString |
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{ |
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$gmp = gmp_init($num->number(), 10); |
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$str = gmp_export($gmp, 1, GMP_MSW_FIRST | GMP_BIG_ENDIAN); |
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if (null !== $mlen) { |
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$len = strlen($str); |
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if ($len > $mlen) { |
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throw new \RangeException('Number is too large.'); |
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} |
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// pad with zeroes |
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if ($len < $mlen) { |
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$str = str_repeat("\0", $mlen - $len) . $str; |
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} |
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} |
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return new OctetString($str); |
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} |
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/** |
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* Perform Octet-String-to-Integer Conversion. |
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* |
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* Defined in SEC 1 section 2.3.8. |
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* |
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* @param OctetString $os |
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* |
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* @return Integer |
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*/ |
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public static function octetStringToInteger(OctetString $os): Integer |
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{ |
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$num = gmp_import($os->string(), 1, GMP_MSW_FIRST | GMP_BIG_ENDIAN); |
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assert($num instanceof \GMP, new \RuntimeException('gmp_import() failed.')); |
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return new Integer(gmp_strval($num, 10)); |
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} |
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/** |
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* Convert a base-10 number to octets. |
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* |
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* This is a convenicence method for integer <-> octet string conversion |
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* without the need for external ASN.1 dependencies. |
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* |
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* @param int|string $num Number in base-10 |
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* @param null|int $mlen Optional desired output length |
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* |
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* @return string |
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*/ |
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public static function numberToOctets($num, ?int $mlen = null): string |
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{ |
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return self::integerToOctetString(new Integer($num), $mlen)->string(); |
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} |
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/** |
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* Convert octets to a base-10 number. |
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* |
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* This is a convenicence method for integer <-> octet string conversion |
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* without the need for external ASN.1 dependencies. |
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* |
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* @param string $str |
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* |
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* @return string Number in base-10 |
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*/ |
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public static function octetsToNumber(string $str): string |
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{ |
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return self::octetStringToInteger(new OctetString($str))->number(); |
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} |
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} |
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sop /
crypto-types
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