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<?php |
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namespace TQ\Shamir; |
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use OutOfBoundsException; |
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use TQ\Shamir\Algorithm\Algorithm; |
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use TQ\Shamir\Algorithm\RandomGeneratorAware; |
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use TQ\Shamir\Algorithm\Shamir; |
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use TQ\Shamir\Random\Generator; |
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use TQ\Shamir\Random\PhpGenerator; |
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/** |
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* Class Secret |
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* |
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* This is a simple static facade to Shamir's shared secret algorithm |
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* |
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* @package TQ\Shamir |
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*/ |
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class Secret |
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{ |
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/** |
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* The random generator |
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* |
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* @var Generator|null |
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*/ |
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protected static $randomGenerator; |
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/** |
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* The algorithm |
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* |
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* @var Algorithm|null |
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*/ |
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protected static $algorithm; |
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/** |
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* Overrides the random generator to use |
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* |
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* @param Generator|null $randomGenerator The random generator |
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* @param boolean $returnOld True to return the old random generator |
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* |
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* @return Generator|null The old random generator if $returnOld is true |
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*/ |
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public static function setRandomGenerator(Generator $randomGenerator = null, $returnOld = true) |
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{ |
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if ($returnOld) { |
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$oldRandomGenerator = self::getRandomGenerator(); |
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} else { |
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$oldRandomGenerator = null; |
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} |
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self::$randomGenerator = $randomGenerator; |
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$algorithm = self::$algorithm; |
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if ($algorithm instanceof RandomGeneratorAware) { |
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$algorithm->setRandomGenerator(self::getRandomGenerator()); |
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} |
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return $oldRandomGenerator; |
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} |
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/** |
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* Returns the random generator |
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* |
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* @return Generator |
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*/ |
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public static function getRandomGenerator() |
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{ |
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if (!self::$randomGenerator) { |
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self::$randomGenerator = new PhpGenerator(); |
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} |
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return self::$randomGenerator; |
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} |
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/** |
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* Returns the algorithm |
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*/ |
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public static function getAlgorithm(): ?Algorithm |
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{ |
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if (!self::$algorithm) { |
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self::setAlgorithm(new Shamir(), false); |
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} |
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return self::$algorithm; |
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} |
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/** |
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* Overrides the algorithm to use |
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* |
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* @param Algorithm|null $algorithm |
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* @param boolean $returnOld True to return the old algorithm |
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* |
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* @return Algorithm|null The old algorithm if $returnOld is true |
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*/ |
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public static function setAlgorithm(Algorithm $algorithm = null, $returnOld = true): ?Algorithm |
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{ |
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if ($returnOld) { |
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$oldAlgorithm = self::getAlgorithm(); |
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} else { |
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$oldAlgorithm = null; |
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} |
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if ($algorithm instanceof RandomGeneratorAware) { |
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$algorithm->setRandomGenerator(self::getRandomGenerator()); |
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} |
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self::$algorithm = $algorithm; |
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return $oldAlgorithm; |
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} |
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/** |
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* Generate shared secrets |
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* |
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* @param string $secret Secret |
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* @param int $shares Number of parts to share |
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* @param int $threshold Minimum number of shares required for decryption |
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* |
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* @return array Secret shares |
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* @throws OutOfBoundsException |
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*/ |
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public static function share(string $secret, int $shares, int $threshold = 2): array |
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{ |
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return self::getAlgorithm()->share($secret, $shares, $threshold); |
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} |
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/** |
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* Recovers the secret from the given shared keys |
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*/ |
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public static function recover(array $keys): string |
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{ |
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return self::getAlgorithm()->recover($keys); |
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} |
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} |
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teqneers /
shamir
