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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto.tls;

import org.spongycastle.crypto.DSA;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.params.DSAPublicKeyParameters;
import org.spongycastle.crypto.signers.DSASigner;
import org.spongycastle.crypto.signers.HMacDSAKCalculator;

public class TlsDSSSigner
    extends TlsDSASigner
{
    public boolean isValidPublicKey(AsymmetricKeyParameter publicKey)
    {
        return publicKey instanceof DSAPublicKeyParameters;
    }

    protected DSA createDSAImpl(short hashAlgorithm)
    {
        return new DSASigner(new HMacDSAKCalculator(TlsUtils.createHash(hashAlgorithm)));
    }

    protected short getSignatureAlgorithm()
    {
        return SignatureAlgorithm.dsa;
    }
}