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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.

There is a newer version: 1.46.99.3-UNOFFICIAL-ROBERTO-RELEASE

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package org.spongycastle.cms;

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

import javax.crypto.Mac;

class MacOutputStream extends OutputStream
{
    private final Mac mac;

    MacOutputStream(Mac mac)
    {
        this.mac = mac;
    }

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

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