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<?php declare(strict_types=1); namespace Mdanter\Ecc\Random; use Mdanter\Ecc\Math\GmpMathInterface; use Mdanter\Ecc\Util\NumberSize; class RandomNumberGenerator implements RandomNumberGeneratorInterface { /** * @var GmpMathInterface */ private $adapter; /** * RandomNumberGenerator constructor. * @param GmpMathInterface $adapter */ public function __construct(GmpMathInterface $adapter) { $this->adapter = $adapter; } /** * @param \GMP $max * @return \GMP */ public function generate(\GMP $max): \GMP { $numBits = NumberSize::bnNumBits($this->adapter, $max); $numBytes = (int) ceil($numBits / 8); // Generate an integer of size >= $numBits $bytes = random_bytes($numBytes); $value = $this->adapter->stringToInt($bytes); $mask = gmp_sub(gmp_pow(2, $numBits), 1); $integer = gmp_and($value, $mask); return $integer; } }