org.spongycastle.crypto.prng.drbg

Class DualECPoints

java.lang.Object

org.spongycastle.crypto.prng.drbg.DualECPoints

public class DualECPoints
extends java.lang.Object

General class for providing point pairs for use with DualEC DRBG. See NIST SP 800-90A for further details.

Constructor Summary

Constructors

Constructor and Description
DualECPoints(int securityStrength, ECPoint p, ECPoint q, int cofactor) Base Constructor.

Method Summary

Modifier and Type	Method and Description
int	getCofactor()
int	getMaxOutlen()
ECPoint	getP()
ECPoint	getQ()
int	getSecurityStrength()
int	getSeedLen()

Methods inherited from class java.lang.Object

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

Constructor Detail

DualECPoints

public DualECPoints(int securityStrength,
                    ECPoint p,
                    ECPoint q,
                    int cofactor)

Base Constructor.

The cofactor is used to calculate the output block length (maxOutlen) according to

     max_outlen = largest multiple of 8 less than ((field size in bits) - (13 + log2(cofactor))
 

Parameters:

securityStrength - maximum security strength to be associated with these parameters

p - the P point.

q - the Q point.

cofactor - cofactor associated with the domain parameters for the point generation.

Method Detail

getSeedLen

public int getSeedLen()

getMaxOutlen

public int getMaxOutlen()

getP

public ECPoint getP()

getQ

public ECPoint getQ()

getSecurityStrength

public int getSecurityStrength()

getCofactor

public int getCofactor()