Top Description Fields Constructors Methods
org.bouncycastle.crypto.prng.drbg

public Class HashSP800DRBG

extends Object
implements SP80090DRBG
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.prng.drbg.SP80090DRBG
Imports
java.util.Hashtable, org.bouncycastle.crypto.Digest, org.bouncycastle.crypto.prng.EntropySource, org.bouncycastle.util.Arrays, .Integers
A SP800-90A Hash DRBG.

Field Summary

Modifier and TypeField and Description
private byte[]
_C

private Digest
_digest

private EntropySource
_entropySource

private long
_reseedCounter

private int
_securityStrength

private int
_seedLength

private byte[]
_V

private static final int
MAX_BITS_REQUEST

private static final byte[]
ONE

private static final long
RESEED_MAX

private static final Hashtable<K, V>
seedlens

Constructor Summary

AccessConstructor and Description
public
HashSP800DRBG(Digest
source digest to use for DRB stream.
digest, int
security strength required (in bits)
securityStrength, EntropySource
source of entropy to use for seeding/reseeding.
entropySource, byte[]
personalization string to distinguish this DRBG (may be null).
personalizationString, byte[]
nonce to further distinguish this DRBG (may be null).
nonce)

Construct a SP800-90A Hash DRBG.

Method Summary

Modifier and TypeMethod and Description
private void
addTo(byte[] longer, byte[] shorter)

private void
doHash(byte[] input, byte[] output)

public int

Returns:

number of bits generated, -1 if a reseed required.
generate(byte[]
output array for generated bits.
output, byte[]
additional input to be added to the DRBG in this step.
additionalInput, boolean
true if a reseed should be forced, false otherwise.
predictionResistant)

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.generate.

Populate a passed in array with random data.

public int

Returns:

the number of bits produced on each internal round of the DRBG.
getBlockSize()

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.getBlockSize.

Return the block size (in bits) of the DRBG.

private byte[]
getEntropy()

private byte[]
hash(byte[] input)

private byte[]
hashgen(byte[] input, int lengthInBits)

public void
reseed(byte[]
additional input to be added to the DRBG in this step.
additionalInput)

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.reseed.

Reseed the DRBG.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

_Cback to summary
private byte[] _C
_digestback to summary
private Digest _digest
_entropySourceback to summary
private EntropySource _entropySource
_reseedCounterback to summary
private long _reseedCounter
_securityStrengthback to summary
private int _securityStrength
_seedLengthback to summary
private int _seedLength
_Vback to summary
private byte[] _V
MAX_BITS_REQUESTback to summary
private static final int MAX_BITS_REQUEST
ONEback to summary
private static final byte[] ONE
RESEED_MAXback to summary
private static final long RESEED_MAX
seedlensback to summary
private static final Hashtable<K, V> seedlens

Constructor Detail

HashSP800DRBGback to summary
public HashSP800DRBG(Digest digest, int securityStrength, EntropySource entropySource, byte[] personalizationString, byte[] nonce)

Construct a SP800-90A Hash DRBG.

Minimum entropy requirement is the security strength requested.

Parameters
digest:Digest

source digest to use for DRB stream.

securityStrength:int

security strength required (in bits)

entropySource:EntropySource

source of entropy to use for seeding/reseeding.

personalizationString:byte[]

personalization string to distinguish this DRBG (may be null).

nonce:byte[]

nonce to further distinguish this DRBG (may be null).

Method Detail

addToback to summary
private void addTo(byte[] longer, byte[] shorter)
doHashback to summary
private void doHash(byte[] input, byte[] output)
generateback to summary
public int generate(byte[] output, byte[] additionalInput, boolean predictionResistant)

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.generate.

Populate a passed in array with random data.

Parameters
output:byte[]

output array for generated bits.

additionalInput:byte[]

additional input to be added to the DRBG in this step.

predictionResistant:boolean

true if a reseed should be forced, false otherwise.

Returns:int

number of bits generated, -1 if a reseed required.

getBlockSizeback to summary
public int getBlockSize()

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.getBlockSize.

Return the block size (in bits) of the DRBG.

Returns:int

the number of bits produced on each internal round of the DRBG.

getEntropyback to summary
private byte[] getEntropy()
hashback to summary
private byte[] hash(byte[] input)
hashgenback to summary
private byte[] hashgen(byte[] input, int lengthInBits)
reseedback to summary
public void reseed(byte[] additionalInput)

Implements org.bouncycastle.crypto.prng.drbg.SP80090DRBG.reseed.

Reseed the DRBG.

Parameters
additionalInput:byte[]

additional input to be added to the DRBG in this step.