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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.

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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;
}