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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.jcajce.provider.asymmetric.util;

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

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

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