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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 java.io.IOException;
import java.io.OutputStream;

import org.spongycastle.crypto.CryptoException;
import org.spongycastle.crypto.Signer;

public class BcSignerOutputStream
    extends OutputStream
{
    private Signer sig;

    BcSignerOutputStream(Signer sig)
    {
        this.sig = sig;
    }

    public void write(byte[] bytes, int off, int len)
        throws IOException
    {
        sig.update(bytes, off, len);
    }

    public void write(byte[] bytes)
        throws IOException
    {
        sig.update(bytes, 0, bytes.length);
    }

    public void write(int b)
        throws IOException
    {
        sig.update((byte)b);
    }

    byte[] getSignature()
        throws CryptoException
    {
        return sig.generateSignature();
    }

    boolean verify(byte[] expected)
    {
        return sig.verifySignature(expected);
    }
}