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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.operator.bc;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.Signer;
import org.spongycastle.crypto.signers.DSADigestSigner;
import org.spongycastle.crypto.signers.ECDSASigner;
import org.spongycastle.operator.OperatorCreationException;

public class BcECContentSignerBuilder
    extends BcContentSignerBuilder
{
    public BcECContentSignerBuilder(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
    {
        super(sigAlgId, digAlgId);
    }

    protected Signer createSigner(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
        throws OperatorCreationException
    {
        Digest dig = digestProvider.get(digAlgId);

        return new DSADigestSigner(new ECDSASigner(), dig);
    }
}