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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.io;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.spongycastle.crypto.Signer;

public class SignerInputStream
    extends FilterInputStream
{
    protected Signer signer;

    public SignerInputStream(
        InputStream stream,
        Signer      signer)
    {
        super(stream);
        this.signer = signer;
    }

    public int read()
        throws IOException
    {
        int b = in.read();

        if (b >= 0)
        {
            signer.update((byte)b);
        }
        return b;
    }

    public int read(
        byte[] b,
        int off,
        int len)
        throws IOException
    {
        int n = in.read(b, off, len);
        if (n > 0)
        {
            signer.update(b, off, n);
        }
        return n;
    }

    public Signer getSigner()
    {
        return signer;
    }
}