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

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package org.bouncycastle.crypto;

import java.math.BigInteger;

/**
 * An "extended" interface for classes implementing DSA-style algorithms, that provides access to
 * the group order.
 */
public interface DSAExt
    extends DSA
{
    /**
     * Get the order of the group that the r, s values in signatures belong to.
     */
    public BigInteger getOrder();
}