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package org.bouncycastle.crypto.params;
import java.math.BigInteger;
import org.bouncycastle.crypto.CipherParameters;
public class DHParameters
implements CipherParameters
{
private static final int DEFAULT_MINIMUM_LENGTH = 160;
// not final due to compiler bug in "simpler" JDKs
private BigInteger g;
private BigInteger p;
private BigInteger q;
private BigInteger j;
private int m;
private int l;
private DHValidationParameters validation;
private static int getDefaultMParam(
int lParam)
{
if (lParam == 0)
{
return DEFAULT_MINIMUM_LENGTH;
}
return lParam < DEFAULT_MINIMUM_LENGTH ? lParam : DEFAULT_MINIMUM_LENGTH;
}
public DHParameters(
BigInteger p,
BigInteger g)
{
this(p, g, null, 0);
}
public DHParameters(
BigInteger p,
BigInteger g,
BigInteger q)
{
this(p, g, q, 0);
}
public DHParameters(
BigInteger p,
BigInteger g,
BigInteger q,
int l)
{
this(p, g, q, getDefaultMParam(l), l, null, null);
}
public DHParameters(
BigInteger p,
BigInteger g,
BigInteger q,
int m,
int l)
{
this(p, g, q, m, l, null, null);
}
public DHParameters(
BigInteger p,
BigInteger g,
BigInteger q,
BigInteger j,
DHValidationParameters validation)
{
this(p, g, q, DEFAULT_MINIMUM_LENGTH, 0, j, validation);
}
public DHParameters(
BigInteger p,
BigInteger g,
BigInteger q,
int m,
int l,
BigInteger j,
DHValidationParameters validation)
{
if (l != 0)
{
BigInteger bigL = BigInteger.valueOf(2L ^ (l - 1));
if (bigL.compareTo(p) == 1)
{
throw new IllegalArgumentException("when l value specified, it must satisfy 2^(l-1) <= p");
}
if (l < m)
{
throw new IllegalArgumentException("when l value specified, it may not be less than m value");
}
}
this.g = g;
this.p = p;
this.q = q;
this.m = m;
this.l = l;
this.j = j;
this.validation = validation;
}
public BigInteger getP()
{
return p;
}
public BigInteger getG()
{
return g;
}
public BigInteger getQ()
{
return q;
}
/**
* Return the subgroup factor J.
*
* @return subgroup factor
*/
public BigInteger getJ()
{
return j;
}
/**
* Return the minimum length of the private value.
*
* @return the minimum length of the private value in bits.
*/
public int getM()
{
return m;
}
/**
* Return the private value length in bits - if set, zero otherwise
*
* @return the private value length in bits, zero otherwise.
*/
public int getL()
{
return l;
}
public DHValidationParameters getValidationParameters()
{
return validation;
}
public boolean equals(
Object obj)
{
if (!(obj instanceof DHParameters))
{
return false;
}
DHParameters pm = (DHParameters)obj;
if (this.getQ() != null)
{
if (!this.getQ().equals(pm.getQ()))
{
return false;
}
}
else
{
if (pm.getQ() != null)
{
return false;
}
}
return pm.getP().equals(p) && pm.getG().equals(g);
}
public int hashCode()
{
return getP().hashCode() ^ getG().hashCode() ^ (getQ() != null ? getQ().hashCode() : 0);
}
}
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