Enum Class DrbgParameters.Capability

java.lang.Object
java.lang.Enum<DrbgParameters.Capability>
java.security.DrbgParameters.Capability
All Implemented Interfaces:
Serializable, Comparable<DrbgParameters.Capability>, Constable
Enclosing class:
DrbgParameters
public static enum DrbgParameters.Capability extends Enum<DrbgParameters.Capability>
The reseedable and prediction resistance capabilities of a DRBG.

When this object is passed to a SecureRandom.getInstance() call, it is the requested minimum capability. When it's returned from SecureRandom.getParameters(), it is the effective capability.

Please note that while the Instantiate_function defined in NIST SP 800-90Ar1 only includes a prediction_resistance_flag parameter, the Capability type includes an extra value RESEED_ONLY because reseeding is an optional function. If NONE is used in an Instantiation object in calling the SecureRandom.getInstance method, the returned DRBG instance is not guaranteed to support reseeding. If RESEED_ONLY or PR_AND_RESEED is used, the instance must support reseeding.

The table below lists possible effective values if a certain capability is requested, i.e. 

Capability requested = ...;
SecureRandom s = SecureRandom.getInstance("DRBG",
        DrbgParameters(-1, requested, null));
Capability effective = ((DrbgParametes.Initiate) s.getParameters())
        .getCapability();
requested and effective capabilities
Requested Value Possible Effective Values
NONENONE, RESEED_ONLY, PR_AND_RESEED
RESEED_ONLYRESEED_ONLY, PR_AND_RESEED
PR_AND_RESEEDPR_AND_RESEED

A DRBG implementation supporting prediction resistance must also support reseeding.

Since:
9

  • Nested Class Summary

    Nested classes/interfaces declared in class Enum

    Enum.EnumDesc<E>
    Modifier and Type
    Class
    Description
    static final class 
    Enum.EnumDesc<E extends Enum<E>>
    A nominal descriptor for an enum constant.

  • Enum Constant Summary

    Enum Constants
    Enum Constant
    Description
    NONE
    Neither prediction resistance nor reseed.
    PR_AND_RESEED
    Both prediction resistance and reseed.
    RESEED_ONLY
    Reseed but no prediction resistance.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    supportsPredictionResistance()
    Returns whether this capability supports prediction resistance.
    boolean
    supportsReseeding()
    Returns whether this capability supports reseeding.
    static DrbgParameters.Capability
    valueOf(String name)
    Returns the enum constant of this class with the specified name.
    static DrbgParameters.Capability[]
    values()
    Returns an array containing the constants of this enum class, in the order they are declared.

    Methods declared in class Enum

    clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
    Modifier and Type
    Method
    Description
    protected final Object
    clone()
    Throws CloneNotSupportedException.
    final int
    compareTo(DrbgParameters.Capability o)
    Compares this enum with the specified object for order.
    final Optional<Enum.EnumDesc<DrbgParameters.Capability>>
    describeConstable()
    Returns an enum descriptor EnumDesc for this instance, if one can be constructed, or an empty Optional if one cannot be.
    final boolean
    equals(Object other)
    Returns true if the specified object is equal to this enum constant.
    protected final void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization has been deprecated for removal.
    final Class<DrbgParameters.Capability>
    getDeclaringClass()
    Returns the Class object corresponding to this enum constant's enum type.
    final int
    hashCode()
    Returns a hash code for this enum constant.
    final String
    name()
    Returns the name of this enum constant, exactly as declared in its enum declaration.
    final int
    ordinal()
    Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).
    String
    toString()
    Returns the name of this enum constant, as contained in the declaration.
    static <T extends Enum<T>>
    T
    valueOf(Class<T> enumClass, String name)
    Returns the enum constant of the specified enum class with the specified name.

    Methods declared in class Object

    getClass, notify, notifyAll, wait, wait, wait
    Modifier and Type
    Method
    Description
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of 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.
    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.

  • Enum Constant Details

  • Method Details

    • values

      public static DrbgParameters.Capability[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static DrbgParameters.Capability valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null

    • supportsReseeding

      public boolean supportsReseeding()
      Returns whether this capability supports reseeding.
      Returns:
      true for PR_AND_RESEED and RESEED_ONLY, and false for NONE

    • supportsPredictionResistance

      public boolean supportsPredictionResistance()
      Returns whether this capability supports prediction resistance.
      Returns:
      true for PR_AND_RESEED, and false for RESEED_ONLY and NONE