org.bouncycastle.jcajce.spec

Class DHDomainParameterSpec

java.lang.Object

javax.crypto.spec.DHParameterSpec

org.bouncycastle.jcajce.spec.DHDomainParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec

public class DHDomainParameterSpec
extends DHParameterSpec

Extension class for DHParameterSpec that wraps a DHDomainParameters object and provides the q domain parameter.

Constructor Summary

Constructors

Constructor and Description
DHDomainParameterSpec(BigInteger p, BigInteger q, BigInteger g) Minimal constructor for parameters able to be used to verify a public key, or use with MQV.
DHDomainParameterSpec(BigInteger p, BigInteger q, BigInteger g, BigInteger j, int l) X9.42 parameters with private value length.
DHDomainParameterSpec(BigInteger p, BigInteger q, BigInteger g, BigInteger j, int m, int l) Base constructor - the full domain parameter set.
DHDomainParameterSpec(BigInteger p, BigInteger q, BigInteger g, int l) Minimal constructor for parameters able to be used to verify a public key, or use with MQV, and a private value length.
DHDomainParameterSpec(DHParameters domainParameters) Base constructor - use the values in an existing set of domain parameters.

Method Summary

Modifier and Type	Method and Description
DHParameters	getDomainParameters() Return the DHDomainParameters object we represent.
BigInteger	getJ() Return the J value for the domain parameter set if available.
int	getM() Return the minimum bitlength for a private value to be generated from these parameters, 0 if not set.
BigInteger	getQ() Return the Q value for the domain parameter set.

Methods inherited from class javax.crypto.spec.DHParameterSpec

getG, getL, getP

Methods inherited from class java.lang.Object

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

Constructor Detail

DHDomainParameterSpec

public DHDomainParameterSpec(DHParameters domainParameters)

Base constructor - use the values in an existing set of domain parameters.

Parameters:

domainParameters - the Diffie-Hellman domain parameters to wrap.

DHDomainParameterSpec

public DHDomainParameterSpec(BigInteger p,
                             BigInteger q,
                             BigInteger g)

Minimal constructor for parameters able to be used to verify a public key, or use with MQV.

Parameters:

p - the prime p defining the Galois field.

g - the generator of the multiplicative subgroup of order g.

q - specifies the prime factor of p - 1

DHDomainParameterSpec

public DHDomainParameterSpec(BigInteger p,
                             BigInteger q,
                             BigInteger g,
                             int l)

Minimal constructor for parameters able to be used to verify a public key, or use with MQV, and a private value length.

Parameters:

p - the prime p defining the Galois field.

g - the generator of the multiplicative subgroup of order g.

q - specifies the prime factor of p - 1

l - the maximum bit length for the private value.

DHDomainParameterSpec

public DHDomainParameterSpec(BigInteger p,
                             BigInteger q,
                             BigInteger g,
                             BigInteger j,
                             int l)

X9.42 parameters with private value length.

Parameters:

p - the prime p defining the Galois field.

g - the generator of the multiplicative subgroup of order g.

q - specifies the prime factor of p - 1

j - optionally specifies the value that satisfies the equation p = jq+1

l - the maximum bit length for the private value.

DHDomainParameterSpec

public DHDomainParameterSpec(BigInteger p,
                             BigInteger q,
                             BigInteger g,
                             BigInteger j,
                             int m,
                             int l)

Base constructor - the full domain parameter set.

Parameters:

p - the prime p defining the Galois field.

g - the generator of the multiplicative subgroup of order g.

q - specifies the prime factor of p - 1

j - optionally specifies the value that satisfies the equation p = jq+1

m - the minimum bit length for the private value.

l - the maximum bit length for the private value.

Method Detail

getQ

public BigInteger getQ()

Return the Q value for the domain parameter set.

Returns:

the value Q.

getJ

public BigInteger getJ()

Return the J value for the domain parameter set if available.

Returns:

the value J, null otherwise.

getM

public int getM()

Return the minimum bitlength for a private value to be generated from these parameters, 0 if not set.

Returns:

minimum bitlength for private value.

getDomainParameters

public DHParameters getDomainParameters()

Return the DHDomainParameters object we represent.

Returns:

the internal DHDomainParameters.