Enum DrbgParameters.Capability
- java.lang.Object
-
- java.lang.Enum<DrbgParameters.Capability>
-
- java.security.DrbgParameters.Capability
- All Implemented Interfaces:
-
Serializable
,Comparable<DrbgParameters.Capability>
- 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 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
Enum Constant Summary
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 type with the specified name. |
static DrbgParameters.Capability[] | values() | Returns an array containing the constants of this enum type, in the order they are declared. |
Methods declared in class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
Methods declared in class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
Enum Constant Detail
PR_AND_RESEED
public static final DrbgParameters.Capability PR_AND_RESEED
Both prediction resistance and reseed.
RESEED_ONLY
public static final DrbgParameters.Capability RESEED_ONLY
Reseed but no prediction resistance.
NONE
public static final DrbgParameters.Capability NONE
Neither prediction resistance nor reseed.
Method Detail
values
public static DrbgParameters.Capability[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
for (DrbgParameters.Capability c : DrbgParameters.Capability.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
valueOf
public static DrbgParameters.Capability valueOf(String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type 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
forPR_AND_RESEED
andRESEED_ONLY
, andfalse
forNONE
supportsPredictionResistance
public boolean supportsPredictionResistance()
Returns whether this capability supports prediction resistance.
- Returns:
-
true
forPR_AND_RESEED
, andfalse
forRESEED_ONLY
andNONE