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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\Backend\SignatureBackend; |
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use SimpleSAML\XMLSecurity\Exception\UnsupportedAlgorithmException; |
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use SimpleSAML\XMLSecurity\Key\KeyInterface; |
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/** |
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* An abstract class that implements a generic digital signature algorithm. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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abstract class AbstractSigner implements SignatureAlgorithmInterface |
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{ |
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/** @var \SimpleSAML\XMLSecurity\Backend\SignatureBackend */ |
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protected SignatureBackend $backend; |
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/** |
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* Build a signature algorithm. |
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* |
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* Extend this class to implement your own signers. |
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* |
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* WARNING: remember to adjust the type of the key to the one that works with your algorithm! |
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* |
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* @param \SimpleSAML\XMLSecurity\Key\KeyInterface $key The signing key. |
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* @param string $algId The identifier of this algorithm. |
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* @param string $digest The identifier of the digest algorithm to use. |
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*/ |
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public function __construct( |
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private KeyInterface $key, |
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protected string $algId, |
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protected string $digest, |
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) { |
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Assert::oneOf( |
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$algId, |
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static::getSupportedAlgorithms(), |
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sprintf('Unsupported algorithm for %s', static::class), |
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UnsupportedAlgorithmException::class, |
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); |
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$this->backend = new (static::DEFAULT_BACKEND)(); |
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$this->backend->setDigestAlg($digest); |
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} |
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/** |
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* @return string |
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*/ |
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public function getAlgorithmId(): string |
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{ |
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return $this->algId; |
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} |
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/** |
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* @return string |
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*/ |
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public function getDigest(): string |
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{ |
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return $this->digest; |
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} |
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/** |
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* @return \SimpleSAML\XMLSecurity\Key\KeyInterface |
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*/ |
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public function getKey(): KeyInterface |
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{ |
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return $this->key; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function setBackend(?SignatureBackend $backend): void |
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{ |
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if ($backend === null) { |
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return; |
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} |
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$this->backend = $backend; |
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$this->backend->setDigestAlg($this->digest); |
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} |
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/** |
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* Sign a given plaintext with the current algorithm and key. |
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* |
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* @param string $plaintext The plaintext to sign. |
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* |
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* @return string The (binary) signature corresponding to the given plaintext. |
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*/ |
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final public function sign(string $plaintext): string |
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{ |
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return $this->backend->sign($this->key, $plaintext); |
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} |
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/** |
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* Verify a signature with the current algorithm and key. |
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* |
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* @param string $plaintext The original signed text. |
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* @param string $signature The (binary) signature to verify. |
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* |
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* @return boolean True if the signature can be verified, false otherwise. |
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*/ |
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final public function verify(string $plaintext, string $signature): bool |
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{ |
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return $this->backend->verify($this->key, $plaintext, $signature); |
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} |
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} |
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simplesamlphp /
xml-security
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