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


      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[]`