nl.open.jwtdependency.org.bouncycastle.crypto.params.DHParameters Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of java-jwt-nodependencies Show documentation

This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

The newest version!

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)
        {
            if (l > p.bitLength())
            {
                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);
    }
}