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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.openpgp.operator.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.Signature;
import java.security.SignatureException;

class SignatureOutputStream
    extends OutputStream
{
    private Signature sig;

    SignatureOutputStream(Signature sig)
    {
        this.sig = sig;
    }

    public void write(byte[] bytes, int off, int len)
        throws IOException
    {
        try
        {
            sig.update(bytes, off, len);
        }
        catch (SignatureException e)
        {
            throw new IOException("signature update caused exception: " + e.getMessage());
        }
    }

    public void write(byte[] bytes)
        throws IOException
    {
        try
        {
            sig.update(bytes);
        }
        catch (SignatureException e)
        {
            throw new IOException("signature update caused exception: " + e.getMessage());
        }
    }

    public void write(int b)
        throws IOException
    {
        try
        {
            sig.update((byte)b);
        }
        catch (SignatureException e)
        {
            throw new IOException("signature update caused exception: " + e.getMessage());
        }
    }
}