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org.bouncycastle.crypto.general

pack-priv Class DsaParametersGenerator

Class Inheritance

extends Object

java.lang.Object
org.bouncycastle.crypto.general.DsaParametersGenerator

Imports

java.math.BigInteger, java.security.SecureRandom, org.bouncycastle.crypto.fips.FipsSHS, org.bouncycastle.crypto.internal.Digest, org.bouncycastle.crypto.internal.params.DsaParameterGenerationParameters, .DsaParameters, .DsaValidationParameters, org.bouncycastle.util.Arrays, .BigIntegers, org.bouncycastle.util.encoders.Hex

Generate suitable parameters for DSA, in line with FIPS 186-2, or FIPS 186-3.

Field Summary

Modifier and Type	Field and Description
private int	certainty
private Digest	digest
private int	L
private int	N
private static final BigInteger	ONE
private SecureRandom	random
private static final BigInteger	TWO
private int	usageIndex
private boolean	use186_3
private static final BigInteger	ZERO

Constructor Summary

Access	Constructor and Description
public	DsaParametersGenerator()
public	DsaParametersGenerator(Digest digest)

Method Summary

Modifier and Type	Method and Description
private static BigInteger	calculateGenerator_FIPS186_2(BigInteger p, BigInteger q, SecureRandom r)
private static BigInteger	calculateGenerator_FIPS186_3_Unverifiable(BigInteger p, BigInteger q, SecureRandom r)
private static BigInteger	calculateGenerator_FIPS186_3_Verifiable(Digest d, BigInteger p, BigInteger q, byte[] seed, int index)
public DsaParameters	generateParameters() which generates the p and g values from the given parameters, returning the DsaParameters object.
private DsaParameters	generateParameters_FIPS186_2()
private DsaParameters	generateParameters_FIPS186_3() generate suitable parameters for DSA, in line with FIPS 186-3 A.1 Generation of the FFC Primes p and q.
private static int	getDefaultN(int L)
private static void	hash(Digest d, byte[] input, byte[] output)
private static void	inc(byte[] buf)
public void	init(int size of the key (range 2^512 -> 2^1024 - 64 bit increments) size, int measure of robustness of prime (for FIPS 186-2 compliance this should be at least 80). certainty, SecureRandom random byte source. random) initialise the key generator.
public void	init(DsaParameterGenerationParameters DSA 2 key generation parameters. params) Initialise the key generator for DSA 2.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

certainty	back to summary
private int certainty

digest	back to summary
private Digest digest

L	back to summary
private int L

N	back to summary
private int N

ONE	back to summary
private static final BigInteger ONE

random	back to summary
private SecureRandom random

TWO	back to summary
private static final BigInteger TWO

usageIndex	back to summary
private int usageIndex

use186_3	back to summary
private boolean use186_3

ZERO	back to summary
private static final BigInteger ZERO

Constructor Detail

DsaParametersGenerator	back to summary
public DsaParametersGenerator()

DsaParametersGenerator	back to summary
public DsaParametersGenerator(Digest digest)

Method Detail

calculateGenerator_FIPS186_2	back to summary
private static BigInteger calculateGenerator_FIPS186_2(BigInteger p, BigInteger q, SecureRandom r)

calculateGenerator_FIPS186_3_Unverifiable	back to summary
private static BigInteger calculateGenerator_FIPS186_3_Unverifiable(BigInteger p, BigInteger q, SecureRandom r)

calculateGenerator_FIPS186_3_Verifiable	back to summary
private static BigInteger calculateGenerator_FIPS186_3_Verifiable(Digest d, BigInteger p, BigInteger q, byte[] seed, int index)

generateParameters	back to summary
public DsaParameters generateParameters() which generates the p and g values from the given parameters, returning the DsaParameters object. Note can take a while...

generateParameters_FIPS186_2	back to summary
private DsaParameters generateParameters_FIPS186_2()

generateParameters_FIPS186_3	back to summary
private DsaParameters generateParameters_FIPS186_3() generate suitable parameters for DSA, in line with FIPS 186-3 A.1 Generation of the FFC Primes p and q.

getDefaultN	back to summary
private static int getDefaultN(int L)

hash	back to summary
private static void hash(Digest d, byte[] input, byte[] output)

inc	back to summary
private static void inc(byte[] buf)

init

back to summary

public void init(int size, int certainty, SecureRandom random)

initialise the key generator.

Parameters

size:int: size of the key (range 2^512 -> 2^1024 - 64 bit increments)
certainty:int: measure of robustness of prime (for FIPS 186-2 compliance this should be at least 80).
random:SecureRandom: random byte source.

init

back to summary

public void init(DsaParameterGenerationParameters params)

Initialise the key generator for DSA 2.

Use this init method if you need to generate parameters for DSA 2 keys.

Parameters

params:DsaParameterGenerationParameters: DSA 2 key generation parameters.