org.bouncycastle.tls.ServerSRPParams 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.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;

import org.bouncycastle.util.Arrays;

public class ServerSRPParams
{
    protected BigInteger N, g, B;
    protected byte[] s;

    public ServerSRPParams(BigInteger N, BigInteger g, byte[] s, BigInteger B)
    {
        this.N = N;
        this.g = g;
        this.s = Arrays.clone(s);
        this.B = B;
    }

    public BigInteger getB()
    {
        return B;
    }
    
    public BigInteger getG()
    {
        return g;
    }

    public BigInteger getN()
    {
        return N;
    }

    public byte[] getS()
    {
        return s;
    }

    /**
     * Encode this {@link ServerSRPParams} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        TlsSRPUtils.writeSRPParameter(N, output);
        TlsSRPUtils.writeSRPParameter(g, output);
        TlsUtils.writeOpaque8(s, output);
        TlsSRPUtils.writeSRPParameter(B, output);
    }

    /**
     * Parse a {@link ServerSRPParams} from an {@link InputStream}.
     * 
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link ServerSRPParams} object.
     * @throws IOException
     */
    public static ServerSRPParams parse(InputStream input) throws IOException
    {
        BigInteger N = TlsSRPUtils.readSRPParameter(input);
        BigInteger g = TlsSRPUtils.readSRPParameter(input);
        byte[] s = TlsUtils.readOpaque8(input, 1);
        BigInteger B = TlsSRPUtils.readSRPParameter(input);

        return new ServerSRPParams(N, g, s, B);
    }
}