Package org.opensaml.xmlsec.algorithm

Class AlgorithmRegistry

java.lang.Object
org.opensaml.xmlsec.algorithm.AlgorithmRegistry
public class AlgorithmRegistry
extends Object
A registry of AlgorithmDescriptor instances, to support various use cases for working with algorithm URIs.

  • Field Details

  • Constructor Details

    • AlgorithmRegistry

      public AlgorithmRegistry()
      Constructor.

  • Method Details

    • get

      @Nullable public AlgorithmDescriptor get​(@Nullable String algorithmURI)
      Get the algorithm descriptor instance associated with the specified algorithm URI.
      Parameters:
      algorithmURI - the algorithm URI to resolve
      Returns:
      the resolved algorithm descriptor or null

    • isRuntimeSupported

      public boolean isRuntimeSupported​(@Nullable String algorithmURI)
      Retrieve indication of whether the runtime environment supports the algorithm.

      This evaluation is performed dynamically when the algorithm is registered.

      Parameters:
      algorithmURI - the algorithm URI to evaluate
      Returns:
      true if the algorithm is supported by the current runtime environment, false otherwise

    • clear

      public void clear()
      Clear all registered algorithms.

    • register

      public void register​(@Nonnull AlgorithmDescriptor descriptor)
      Register an algorithm.
      Parameters:
      descriptor - the algorithm

    • deregister

      public void deregister​(@Nonnull AlgorithmDescriptor descriptor)
      Deregister an algorithm.
      Parameters:
      descriptor - the algorithm

    • deregister

      public void deregister​(@Nonnull String uri)
      Deregister an algorithm.
      Parameters:
      uri - the algorithm URI

    • getDigestAlgorithm

      @Nullable public DigestAlgorithm getDigestAlgorithm​(@Nonnull String digestMethod)
      Lookup a digest method algorithm descriptor by the JCA digest method ID.
      Parameters:
      digestMethod - the JCA digest method ID.
      Returns:
      the algorithm descriptor, or null

    • getSignatureAlgorithm

      @Nullable public SignatureAlgorithm getSignatureAlgorithm​(@Nonnull String keyType, @Nonnull String digestMethod)
      Lookup a signature algorithm descriptor by the JCA key algorithm and digest method IDs.
      Parameters:
      keyType - the JCA key algorithm ID.
      digestMethod - the JCA digest method ID.
      Returns:
      the algorithm descriptor, or null

    • getRegisteredURIsByType

      @Nonnull @NonnullElements @Unmodifiable @NotLive public Set<String> getRegisteredURIsByType​(@Nonnull AlgorithmDescriptor.AlgorithmType type)
      Get the set of algorithm URIs registered for the given type.
      Parameters:
      type - the algorithm type
      Returns:
      the set of URIs for the given type, may be empty

    • getRegisteredByType

      @Nonnull @NonnullElements @Unmodifiable @NotLive public Set<AlgorithmDescriptor> getRegisteredByType​(@Nonnull AlgorithmDescriptor.AlgorithmType type)
      Get the set of AlgorithmDescriptor registered for the given type.
      Parameters:
      type - the algorithm type
      Returns:
      the set of descriptors for the given type, may be empty

    • index

      private void index​(AlgorithmDescriptor descriptor)
      Add the algorithm descriptor to the indexes which support the various lookup methods available via the registry's API.
      Parameters:
      descriptor - the algorithm

    • deindex

      private void deindex​(AlgorithmDescriptor descriptor)
      Remove the algorithm descriptor from the indexes which support the various lookup methods available via the registry's API.
      Parameters:
      descriptor - the algorithm

    • checkRuntimeSupports

      private boolean checkRuntimeSupports​(AlgorithmDescriptor descriptor)
      Evaluate whether the algorithm is supported by the current runtime environment.
      Parameters:
      descriptor - the algorithm
      Returns:
      true if runtime supports the algorithm, false otherwise

    • checkCipherSupportedKeyLength

      private boolean checkCipherSupportedKeyLength​(AlgorithmDescriptor descriptor) throws NoSuchAlgorithmException
      Check if the key length of the specified Cipher-based algorithm, if known, is supported by the current runtime.
      Parameters:
      descriptor - the algorithm
      Returns:
      true if key length supported, false otherwise
      Throws:
      NoSuchAlgorithmException - if the associated JCA algorithm is not supported by the runtime

    • checkSpecialCasesRuntimeSupport

      private boolean checkSpecialCasesRuntimeSupport​(AlgorithmDescriptor descriptor)
      Check for special cases of runtime support which failed the initial simple service class load check.
      Parameters:
      descriptor - the algorithm
      Returns:
      true if algorithm is supported by the runtime environment, false otherwise