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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\Alg\Signature; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XMLSecurity\Constants as C; |
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use SimpleSAML\XMLSecurity\Exception\BlacklistedAlgorithmException; |
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use SimpleSAML\XMLSecurity\Exception\UnsupportedAlgorithmException; |
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use SimpleSAML\XMLSecurity\Key\KeyInterface; |
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use function array_key_exists; |
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use function in_array; |
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use function sprintf; |
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/** |
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* Factory class to create and configure digital signature algorithms. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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final class SignatureAlgorithmFactory |
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{ |
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/** |
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* A cache of algorithm implementations indexed by algorithm ID. |
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* |
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* @var array<string, \SimpleSAML\XMLSecurity\Alg\Signature\SignatureAlgorithmInterface> |
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*/ |
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protected static array $cache = []; |
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/** |
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* Whether the factory has been initialized or not. |
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* |
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* @var bool |
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*/ |
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protected static bool $initialized = false; |
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/** |
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* An array of blacklisted algorithms. |
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* |
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* Defaults to RSA-SHA1 & HMAC-SHA1 due to the weakness of SHA1. |
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* |
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* @var string[] |
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*/ |
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private const DEFAULT_BLACKLIST = [ |
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C::SIG_RSA_SHA1, |
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C::SIG_HMAC_SHA1, |
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]; |
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/** |
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* An array of default algorithms that can be used. |
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* |
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* @var class-string[] |
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*/ |
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private const SUPPORTED_DEFAULTS = [ |
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RSA::class, |
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HMAC::class, |
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]; |
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/** |
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* Build a factory that creates algorithms. |
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* |
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* @param string[]|null $blacklist A list of algorithms forbidden for their use. |
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*/ |
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public function __construct( |
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protected ?array $blacklist = self::DEFAULT_BLACKLIST, |
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) { |
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// initialize the cache for supported algorithms per known implementation |
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if (!self::$initialized && $blacklist !== null) { |
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foreach (self::SUPPORTED_DEFAULTS as $algorithm) { |
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foreach ($algorithm::getSupportedAlgorithms() as $algId) { |
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if (array_key_exists($algId, self::$cache)) { |
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/* |
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* If the key existed before initialization, that means someone registered a handler for this |
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* algorithm, so we should respect that and skip registering the default here. |
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*/ |
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continue; |
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} |
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self::$cache[$algId] = $algorithm; |
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} |
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} |
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self::$initialized = true; |
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} |
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} |
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/** |
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* Get a new object implementing the given digital signature algorithm. |
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* |
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* @param string $algId The identifier of the algorithm desired. |
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* @param \SimpleSAML\XMLSecurity\Key\KeyInterface $key The key to use with the given algorithm. |
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* |
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* @return \SimpleSAML\XMLSecurity\Alg\Signature\SignatureAlgorithmInterface An object implementing the given |
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* algorithm. |
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* |
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* @throws \SimpleSAML\XMLSecurity\Exception\UnsupportedAlgorithmException If an error occurs, e.g. the given |
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* algorithm is blacklisted, unknown or the given key is not suitable for it. |
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*/ |
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public function getAlgorithm(string $algId, KeyInterface $key): SignatureAlgorithmInterface |
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{ |
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Assert::false( |
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($this->blacklist !== null) && in_array($algId, $this->blacklist, true), |
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sprintf('Blacklisted algorithm: \'%s\'.', $algId), |
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BlacklistedAlgorithmException::class, |
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); |
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Assert::keyExists( |
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self::$cache, |
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$algId, |
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sprintf('Unknown or unsupported algorithm: \'%s\'.', $algId), |
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UnsupportedAlgorithmException::class, |
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); |
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return new self::$cache[$algId]($key, $algId); |
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} |
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/** |
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* Register an implementation of some algorithm(s) for its use. |
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* |
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* @param class-string $className |
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*/ |
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public static function registerAlgorithm(string $className): void |
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{ |
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Assert::implementsInterface( |
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$className, |
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SignatureAlgorithmInterface::class, |
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sprintf( |
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'Cannot register algorithm "%s", must implement %s.', |
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$className, |
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SignatureAlgorithmInterface::class, |
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), |
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); |
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foreach ($className::getSupportedAlgorithms() as $algId) { |
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self::$cache[$algId] = $className; |
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} |
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} |
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} |
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simplesamlphp /
xml-security
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