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package zeroecho.core.alg.ed448;

import zeroecho.core.spec.AlgorithmKeySpec;

/**
 * <h2>Ed448 Key Generation Specification</h2>
 *
 * Marker specification for generating Ed448 key pairs.
 *
 * <p>
 * Unlike parameterized algorithms (e.g., RSA with modulus size), Ed448 has
 * fixed domain parameters defined in
 * <a href="https://www.rfc-editor.org/rfc/rfc8032">RFC 8032</a>. As a result,
 * this spec carries no configuration fields - it serves only as a typed handle
 * linking {@link Ed448KeyGenBuilder} with the surrounding framework.
 * </p>
 *
 * <h2>Usage</h2> <pre>{@code
 * // Generate a new Ed448 key pair using the default spec
 * KeyPair kp = new Ed448KeyGenBuilder().generateKeyPair(Ed448KeyGenSpec.defaultSpec());
 * }</pre>
 *
 * <h2>Thread-safety</h2> The {@link #defaultSpec()} instance is immutable and
 * safe to reuse across threads.
 *
 * @since 1.0
 */
public final class Ed448KeyGenSpec implements AlgorithmKeySpec {
    private static final Ed448KeyGenSpec DEFAULT = new Ed448KeyGenSpec();

    /**
     * Returns the shared default specification instance for Ed448 key generation.
     *
     * <p>
     * Since Ed448 has no configurable generation parameters, all key generation
     * uses this singleton. This avoids unnecessary object allocation and clarifies
     * intent.
     * </p>
     *
     * @return the singleton {@code Ed448KeyGenSpec} instance
     */
    public static Ed448KeyGenSpec defaultSpec() {
        return DEFAULT;
    }
}
