Class EdDSAParameterSpec

java.lang.Object
java.security.spec.EdDSAParameterSpec
All Implemented Interfaces:
AlgorithmParameterSpec
public class EdDSAParameterSpec extends Object implements AlgorithmParameterSpec
A class used to specify EdDSA signature and verification parameters. All algorithm modes in RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA) can be specified using combinations of the settings in this class.
  • If prehash is true, then the mode is Ed25519ph or Ed448ph
  • Otherwise, if a context is present, the mode is Ed25519ctx or Ed448
  • Otherwise, the mode is Ed25519 or Ed448
Since:
15
External Specifications

  • Constructor Summary

    Constructors
    Constructor
    Description
    EdDSAParameterSpec(boolean prehash)
    Construct an EdDSAParameterSpec by specifying whether the prehash mode is used.
    EdDSAParameterSpec(boolean prehash, byte[] context)
    Construct an EdDSAParameterSpec by specifying a context and whether the prehash mode is used.

  • Method Summary

    Modifier and Type
    Method
    Description
    Optional<byte[]>
    getContext()
    Get the context that the signature will use.
    boolean
    isPrehash()
    Get whether the prehash mode is specified.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Constructor Details

    • EdDSAParameterSpec

      public EdDSAParameterSpec(boolean prehash)
      Construct an EdDSAParameterSpec by specifying whether the prehash mode is used. No context is provided so this constructor specifies a mode in which the context is null. Note that this mode may be different from the mode in which an empty array is used as the context.
      Parameters:
      prehash - whether the prehash mode is specified.

    • EdDSAParameterSpec

      public EdDSAParameterSpec(boolean prehash, byte[] context)
      Construct an EdDSAParameterSpec by specifying a context and whether the prehash mode is used. The context may not be null, but it may be an empty array. The mode used when the context is an empty array may not be the same as the mode used when the context is absent.
      Parameters:
      prehash - whether the prehash mode is specified.
      context - the context is copied and bound to the signature.
      Throws:
      NullPointerException - if context is null.
      InvalidParameterException - if context length is greater than 255.

  • Method Details

    • isPrehash

      public boolean isPrehash()
      Get whether the prehash mode is specified.
      Returns:
      whether the prehash mode is specified.

    • getContext

      public Optional<byte[]> getContext()
      Get the context that the signature will use.
      Returns:
      Optional contains a copy of the context or empty if context is null.