- All Implemented Interfaces:
Serializable,Comparable<DrbgParameters.Capability>,Constable
- Enclosing class:
DrbgParameters
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 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.
- Since:
- 9
-
Nested Class Summary
Nested classes/interfaces declared in class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>> -
Enum Constant Summary
Enum ConstantsEnum ConstantDescriptionNeither prediction resistance nor reseed.Both prediction resistance and reseed.Reseed but no prediction resistance. -
Method Summary
Modifier and TypeMethodDescriptionbooleanReturns whether this capability supports prediction resistance.booleanReturns whether this capability supports reseeding.static DrbgParameters.CapabilityReturns 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.
-
Enum Constant Details
-
PR_AND_RESEED
Both prediction resistance and reseed. -
RESEED_ONLY
Reseed but no prediction resistance. -
NONE
Neither prediction resistance nor reseed.
-
-
Method Details
-
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
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 nameNullPointerException- if the argument is null
-
supportsReseeding
public boolean supportsReseeding()Returns whether this capability supports reseeding.- Returns:
trueforPR_AND_RESEEDandRESEED_ONLY, andfalseforNONE
-
supportsPredictionResistance
public boolean supportsPredictionResistance()Returns whether this capability supports prediction resistance.- Returns:
trueforPR_AND_RESEED, andfalseforRESEED_ONLYandNONE
-