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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.cms;

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

class SigOutputStream extends OutputStream
{
    private final Signature sig;

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

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

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