public
abstract
class
SecureRandomSpi
extends Object
implements
Serializable
| java.lang.Object | |
| ↳ | java.security.SecureRandomSpi |
This class defines the Service Provider Interface (SPI)
for the SecureRandom class.
All the abstract methods in this class must be implemented by each
service provider who wishes to supply the implementation
of a cryptographically strong pseudo-random number generator.
See also:
Public constructors | |
|---|---|
SecureRandomSpi()
|
|
Protected methods | |
|---|---|
abstract
byte[]
|
engineGenerateSeed(int numBytes)
Returns the given number of seed bytes. |
abstract
void
|
engineNextBytes(byte[] bytes)
Generates a user-specified number of random bytes. |
abstract
void
|
engineSetSeed(byte[] seed)
Reseeds this random object. |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
byte[] engineGenerateSeed (int numBytes)
Returns the given number of seed bytes. This call may be used to seed other random number generators.
| Parameters | |
|---|---|
numBytes |
int:
the number of seed bytes to generate. |
| Returns | |
|---|---|
byte[] |
the seed bytes. |
void engineNextBytes (byte[] bytes)
Generates a user-specified number of random bytes.
If a call to engineSetSeed had not occurred previously,
the first call to this method forces this SecureRandom implementation
to seed itself. This self-seeding will not occur if
engineSetSeed was previously called.
| Parameters | |
|---|---|
bytes |
byte:
the array to be filled in with random bytes.
|
void engineSetSeed (byte[] seed)
Reseeds this random object. The given seed supplements, rather than replaces, the existing seed. Thus, repeated calls are guaranteed never to reduce randomness.
| Parameters | |
|---|---|
seed |
byte:
the seed.
|
Developers