Added in API level 35

Summary: Enums | Methods | Inherited Methods

DrbgParameters.Capability

public static final enum DrbgParameters.Capability
extends Enum<DrbgParameters.Capability>

java.lang.Object
↳	java.lang.Enum<java.security.DrbgParameters.Capability>
	↳	java.security.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
NONE	NONE, RESEED_ONLY, PR_AND_RESEED
RESEED_ONLY	RESEED_ONLY, PR_AND_RESEED
PR_AND_RESEED	PR_AND_RESEED

A DRBG implementation supporting prediction resistance must also support reseeding.

Summary

Enum values
DrbgParameters.Capability	NONE Neither prediction resistance nor reseed.
DrbgParameters.Capability	PR_AND_RESEED Both prediction resistance and reseed.
DrbgParameters.Capability	RESEED_ONLY Reseed but no prediction resistance.

Public methods
boolean	supportsPredictionResistance() Returns whether this capability supports prediction resistance.
boolean	supportsReseeding() Returns whether this capability supports reseeding.
String	toString() Returns the name of this enum constant, as contained in the declaration.
static DrbgParameters.Capability	valueOf(String name)
static final Capability[]	values()

Inherited methods
From class java.lang.Enum final Object clone() Throws CloneNotSupportedException. final int compareTo(DrbgParameters.Capability o) Compares this enum with the specified object for order. final boolean equals(Object other) Returns true if the specified object is equal to this enum constant. final void finalize() enum classes cannot have finalize methods. 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.
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
From interface java.lang.Comparable abstract int compareTo(DrbgParameters.Capability o) Compares this object with the specified object for order.

Enum values

NONE

Added in API level 35

public static final DrbgParameters.Capability NONE

Neither prediction resistance nor reseed.

PR_AND_RESEED

Added in API level 35

public static final DrbgParameters.Capability PR_AND_RESEED

Both prediction resistance and reseed.

RESEED_ONLY

Added in API level 35

public static final DrbgParameters.Capability RESEED_ONLY

Reseed but no prediction resistance.

Public methods

supportsPredictionResistance

Added in API level 35

public boolean supportsPredictionResistance ()

Returns whether this capability supports prediction resistance.

Returns
boolean	true for PR_AND_RESEED, and false for RESEED_ONLY and NONE

supportsReseeding

Added in API level 35

public boolean supportsReseeding ()

Returns whether this capability supports reseeding.

Returns
boolean	true for PR_AND_RESEED and RESEED_ONLY, and false for NONE

toString

Added in API level 35

public String toString ()

Returns the name of this enum constant, as contained in the declaration. This method may be overridden, though it typically isn't necessary or desirable. An enum class should override this method when a more "programmer-friendly" string form exists.

Returns
String	the name of this enum constant

valueOf

public static DrbgParameters.Capability valueOf (String name)

Parameters
name	String

Returns
DrbgParameters.Capability

values

public static final Capability[] values ()

Returns
Capability[]