org.bouncycastle.tls.TlsSRPUtils 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 java.util.Hashtable;

import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.Integers;

public class TlsSRPUtils
{
    public static final Integer EXT_SRP = Integers.valueOf(ExtensionType.srp);

    public static void addSRPExtension(Hashtable extensions, byte[] identity) throws IOException
    {
        extensions.put(EXT_SRP, createSRPExtension(identity));
    }

    public static byte[] getSRPExtension(Hashtable extensions) throws IOException
    {
        byte[] extensionData = TlsUtils.getExtensionData(extensions, EXT_SRP);
        return extensionData == null ? null : readSRPExtension(extensionData);
    }

    public static byte[] createSRPExtension(byte[] identity) throws IOException
    {
        if (identity == null)
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }

        return TlsUtils.encodeOpaque8(identity);
    }

    public static byte[] readSRPExtension(byte[] extensionData) throws IOException
    {
        if (extensionData == null)
        {
            throw new IllegalArgumentException("'extensionData' cannot be null");
        }

        return TlsUtils.decodeOpaque8(extensionData, 1);
    }

    public static BigInteger readSRPParameter(InputStream input) throws IOException
    {
        return new BigInteger(1, TlsUtils.readOpaque16(input, 1));
    }

    public static void writeSRPParameter(BigInteger x, OutputStream output) throws IOException
    {
        TlsUtils.writeOpaque16(BigIntegers.asUnsignedByteArray(x), output);
    }

    public static boolean isSRPCipherSuite(int cipherSuite)
    {
        switch (TlsUtils.getKeyExchangeAlgorithm(cipherSuite))
        {
        case KeyExchangeAlgorithm.SRP:
        case KeyExchangeAlgorithm.SRP_DSS:
        case KeyExchangeAlgorithm.SRP_RSA:
            return true;

        default:
            return false;
        }
    }
}