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

public Class HMacSP800DRBG

extends Object
implements SP80090DRBG
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.prng.drbg.SP80090DRBG
Imports
org.bouncycastle.crypto.Mac, org.bouncycastle.crypto.params.KeyParameter, org.bouncycastle.crypto.prng.EntropySource, org.bouncycastle.util.Arrays
A SP800-90A HMAC DRBG.

Field Summary

Modifier and TypeField and Description
private EntropySource
_entropySource

private Mac
_hMac

private byte[]
_K

private long
_reseedCounter

private int
_securityStrength

private byte[]
_V

private static final int
MAX_BITS_REQUEST

private static final long
RESEED_MAX

Constructor Summary

AccessConstructor and Description
public
HMacSP800DRBG(Mac
Hash MAC to base the DRBG on.
hMac, 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
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 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 void
hmac_DRBG_Update(byte[] seedMaterial)

private void
hmac_DRBG_Update_Func(byte[] seedMaterial, byte vValue)

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

_entropySourceback to summary
private EntropySource _entropySource
_hMacback to summary
private Mac _hMac
_Kback to summary
private byte[] _K
_reseedCounterback to summary
private long _reseedCounter
_securityStrengthback to summary
private int _securityStrength
_Vback to summary
private byte[] _V
MAX_BITS_REQUESTback to summary
private static final int MAX_BITS_REQUEST
RESEED_MAXback to summary
private static final long RESEED_MAX

Constructor Detail

HMacSP800DRBGback to summary
public HMacSP800DRBG(Mac hMac, int securityStrength, EntropySource entropySource, byte[] personalizationString, byte[] nonce)

Construct a SP800-90A Hash DRBG.

Minimum entropy requirement is the security strength requested.

Parameters
hMac:Mac

Hash MAC to base the DRBG on.

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

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 round of the DRBG.

getEntropyback to summary
private byte[] getEntropy()
hmac_DRBG_Updateback to summary
private void hmac_DRBG_Update(byte[] seedMaterial)
hmac_DRBG_Update_Funcback to summary
private void hmac_DRBG_Update_Func(byte[] seedMaterial, byte vValue)
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.