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<?php |
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declare(strict_types=1); |
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namespace Mdanter\Ecc\Util; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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class NumberSize |
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{ |
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/** |
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* @param GmpMathInterface $adapter |
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* @param \GMP $x |
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* @return float |
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*/ |
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public static function getCeiledByteSize(GmpMathInterface $adapter, \GMP $x): float |
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{ |
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$log2 = self::bnNumBits($adapter, $x); |
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return ceil($log2 / 8); |
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} |
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/** |
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* @param GmpMathInterface $adapter |
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* @param \GMP $x |
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* @return float |
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*/ |
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public static function getFlooredByteSize(GmpMathInterface $adapter, \GMP $x): float |
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{ |
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$log2 = self::bnNumBits($adapter, $x); |
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return floor($log2 / 8) + 1; |
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} |
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/** |
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* Returns the number of minimum required bytes to store a given number. Non-significant upper bits are not counted. |
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* |
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* @param GmpMathInterface $adapter |
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* @param \GMP $x |
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* @return int |
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* |
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* @link https://www.openssl.org/docs/crypto/BN_num_bytes.html |
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*/ |
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public static function bnNumBytes(GmpMathInterface $adapter, \GMP $x): int |
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{ |
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// https://github.com/luvit/openssl/blob/master/openssl/crypto/bn/bn.h#L402 |
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return (int) floor((self::bnNumBits($adapter, $x) + 7) / 8); |
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} |
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/** |
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* Returns the number of bits used to store this number. Non-significant upper bits are not counted. |
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* |
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* @param GmpMathInterface $adapter |
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* @param \GMP $x |
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* @return int |
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* |
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* @link https://www.openssl.org/docs/crypto/BN_num_bytes.html |
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*/ |
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public static function bnNumBits(GmpMathInterface $adapter, \GMP $x): int |
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{ |
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$zero = gmp_init(0, 10); |
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if ($adapter->equals($x, $zero)) { |
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return 0; |
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} |
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$log2 = 0; |
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while (false === $adapter->equals($x, $zero)) { |
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$x = $adapter->rightShift($x, 1); |
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$log2++; |
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} |
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return $log2 ; |
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} |
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} |
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shanecurran /
phpecc
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