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The FIPS 140-2 Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms certified to FIPS 140-2 level 1. This jar contains the debug version JCE provider and low-level API for the BC-FJA version 1.0.2.3, FIPS Certificate #3514. Please note the debug jar is not certified.

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package org.bouncycastle.crypto;

/**
 * Basic interface for key agreement implementations.
 * @param  the parameters class for the particular version.
 */
public interface Agreement
{
    /**
     * Return the parameters being used by this agreement.
     *
     * @return the key agreement parameters.
     */
    T getParameters();

    /**
     * Calculate the agreement using the passed in public key.
     *
     * @param key the public key of the other party.
     * @return the agreement value.
     */
    byte[] calculate(AsymmetricPublicKey key);
}