/*******************************************************************************
 * Copyright (C) 2026, Leo Galambos
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. All advertising materials mentioning features or use of this software must
 *    display the following acknowledgement:
 *    This product includes software developed by the Egothor project.
 *
 * 4. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
package zeroecho.core.spec;

/**
 * Marker interface for algorithm-specific key specifications.
 * <p>
 * Implementations carry the parameters required to construct or validate a key
 * for a specific algorithm family (e.g., AES, ChaCha20, HMAC, X25519). Typical
 * fields include key size, algorithm identifier, or the raw key material to be
 * imported.
 *
 * <h2>Design</h2>
 * <ul>
 * <li>Separates algorithm parameters from key builders such as
 * operation-specific key generator or importer.</li>
 * <li>Provides a type-safe way to pass algorithm requirements around instead of
 * raw integers or opaque byte arrays.</li>
 * <li>Allows higher layers to work generically with {@code AlgorithmKeySpec}
 * while still permitting algorithm-specific extensions.</li>
 * </ul>
 *
 * <h2>Usage</h2>
 * <p>
 * Applications never implement this interface directly. Instead, use provided
 * spec classes such as {@code AesKeySpec}, {@code ChaChaKeySpec}, etc.
 * Libraries may extend it when introducing new algorithm families.
 *
 * <p>
 * <b>Thread safety:</b> Implementations should be immutable and serializable
 * only if necessary for configuration. Raw key material should be handled with
 * care to avoid accidental exposure.
 * </p>
 *
 * @since 1.0
 */
public interface AlgorithmKeySpec {
}
