org.bouncycastle.tls.DefaultTlsSRPConfigVerifier Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.math.BigInteger;
import java.util.Vector;

import org.bouncycastle.tls.crypto.SRP6Group;
import org.bouncycastle.tls.crypto.SRP6StandardGroups;
import org.bouncycastle.tls.crypto.TlsSRPConfig;

public class DefaultTlsSRPConfigVerifier
    implements TlsSRPConfigVerifier
{
    private static final Vector DEFAULT_GROUPS = new Vector();

    static
    {
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_1024);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_1536);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_2048);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_3072);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_4096);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_6144);
        DEFAULT_GROUPS.addElement(SRP6StandardGroups.rfc5054_8192);
    }

    // Vector is (SRP6Group)
    protected final Vector groups;

    /**
     * Accept only the group parameters specified in RFC 5054 Appendix A.
     */
    public DefaultTlsSRPConfigVerifier()
    {
        this(DEFAULT_GROUPS);
    }

    /**
     * Specify a custom set of acceptable group parameters.
     * 
     * @param groups a {@link Vector} of acceptable {@link SRP6Group}.
     */
    public DefaultTlsSRPConfigVerifier(Vector groups)
    {
        this.groups = new Vector(groups);
    }

    public boolean accept(TlsSRPConfig srpConfig)
    {
        for (int i = 0; i < groups.size(); ++i)
        {
            if (areGroupsEqual(srpConfig, (SRP6Group)groups.elementAt(i)))
            {
                return true;
            }
        }
        return false;
    }

    protected boolean areGroupsEqual(TlsSRPConfig a, SRP6Group b)
    {
        BigInteger[] ng = a.getExplicitNG();
        return areParametersEqual(ng[0], b.getN()) && areParametersEqual(ng[1], b.getG());
    }

    protected boolean areParametersEqual(BigInteger a, BigInteger b)
    {
        return a == b || a.equals(b);
    }
}