Package gnu.crypto.prng

Class FortunaStandalone.Generator

java.lang.Object

gnu.crypto.prng.BasePRNGStandalone

gnu.crypto.prng.FortunaStandalone.Generator

All Implemented Interfaces:

IRandomStandalone, Serializable, Cloneable

Enclosing class:

FortunaStandalone

public static class FortunaStandalone.Generator
extends BasePRNGStandalone
implements Cloneable

The Fortuna generator function. The generator is a PRNG in its own right; Fortuna itself is basically a wrapper around this generator that manages reseeding in a secure way.

See Also:

• Serialized Form

Field Summary

Fields inherited from class gnu.crypto.prng.BasePRNGStandalone

buffer, initialised, name, ndx

Constructor Summary

Constructors

Constructor	Description
Generator()

Method Summary

Modifier and Type	Method	Description
final void	addRandomByte(byte b)	Supplement, or possibly replace, the random state of this PRNG with a random byte.
final void	addRandomBytes(byte[] seed, int offset, int length)	Supplement, or possibly replace, the random state of this PRNG with a sequence of new random bytes.
final void	fillBlock()
final byte	nextByte()	Returns the next 8 bits of random data generated from this instance.
final void	nextBytes(byte[] out, int offset, int length)	Fills the designated byte array, starting from byte at index offset, for a maximum of length bytes with the output of this generator instance.
void	setup(Map<String,byte[]> attributes)

Methods inherited from class gnu.crypto.prng.BasePRNGStandalone

addRandomBytes, clone, init, isInitialised, name, nextBytes

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Generator

public Generator()

Method Details

nextByte

public final byte nextByte()

Description copied from interface: IRandomStandalone

Returns the next 8 bits of random data generated from this instance.

Specified by:

nextByte in interface IRandomStandalone

Overrides:

nextByte in class BasePRNGStandalone

Returns:

the next 8 bits of random data generated from this instance.

nextBytes

public final void nextBytes(byte[] out,
 int offset,
 int length)

Description copied from interface: IRandomStandalone

Fills the designated byte array, starting from byte at index offset, for a maximum of length bytes with the output of this generator instance.

Specified by:

nextBytes in interface IRandomStandalone

Overrides:

nextBytes in class BasePRNGStandalone

Parameters:

out - the placeholder to contain the generated random bytes.

offset - the starting index in out to consider. This method does nothing if this parameter is not within 0 and out.length.

length - the maximum number of required random bytes. This method does nothing if this parameter is less than 1.

addRandomByte

public final void addRandomByte(byte b)

Description copied from interface: IRandomStandalone

Supplement, or possibly replace, the random state of this PRNG with a random byte.

Implementations are not required to implement this method in any meaningful way; this may be a no-operation, and implementations may throw an UnsupportedOperationException.

Specified by:

addRandomByte in interface IRandomStandalone

Overrides:

addRandomByte in class BasePRNGStandalone

Parameters:

b - The byte to add.

addRandomBytes

public final void addRandomBytes(byte[] seed,
 int offset,
 int length)

Description copied from interface: IRandomStandalone

Supplement, or possibly replace, the random state of this PRNG with a sequence of new random bytes.

Implementations are not required to implement this method in any meaningful way; this may be a no-operation, and implementations may throw an UnsupportedOperationException.

Specified by:

addRandomBytes in interface IRandomStandalone

Overrides:

addRandomBytes in class BasePRNGStandalone

Parameters:

seed - The buffer of new random bytes to add.

offset - The offset from whence to begin reading random bytes.

length - The number of random bytes to add.

fillBlock

public final void fillBlock()

Specified by:

fillBlock in class BasePRNGStandalone

setup

public void setup(Map<String,byte[]> attributes)

Specified by:

setup in class BasePRNGStandalone