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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;

/**
 * Interface describing a symmetric key.
 */
public interface SymmetricKey
    extends Key
{
    /**
     * Return the bytes associated with this key.
     *
     * @return key bytes, null or exception if they are not available.
     */
    byte[] getKeyBytes();
}