Capability
class Capability
kotlin.Any | ||
↳ | kotlin.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 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 | |
---|---|
Neither prediction resistance nor reseed. |
|
Both prediction resistance and reseed. |
|
Reseed but no prediction resistance. |
Public methods | |
---|---|
Boolean |
Returns whether this capability supports prediction resistance. |
Boolean |
Returns whether this capability supports reseeding. |
String |
toString() |
Enum values
NONE
enum val NONE : DrbgParameters.Capability
Neither prediction resistance nor reseed.
PR_AND_RESEED
enum val PR_AND_RESEED : DrbgParameters.Capability
Both prediction resistance and reseed.
RESEED_ONLY
enum val RESEED_ONLY : DrbgParameters.Capability
Reseed but no prediction resistance.
Public methods
supportsPredictionResistance
fun supportsPredictionResistance(): Boolean
Returns whether this capability supports prediction resistance.
Return | |
---|---|
Boolean |
true for PR_AND_RESEED , and false for RESEED_ONLY and NONE |
supportsReseeding
fun supportsReseeding(): Boolean
Returns whether this capability supports reseeding.
Return | |
---|---|
Boolean |
true for PR_AND_RESEED and RESEED_ONLY , and false for NONE |