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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.jce.provider;

import java.math.BigInteger;
import java.io.IOException;

public interface DSAEncoder
{
    byte[] encode(BigInteger r, BigInteger s)
        throws IOException;

    BigInteger[] decode(byte[] sig)
        throws IOException;
}