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package zeroecho.core.alg.ed448;

import zeroecho.core.alg.common.eddsa.AbstractEncodedPublicKeyBuilder;
import zeroecho.core.spec.AlgorithmKeySpec;

/**
 * <h2>Ed448 Public Key Builder</h2>
 *
 * Concrete builder for importing Ed448 public keys from their X.509-encoded
 * representation.
 *
 * <p>
 * This class extends {@link AbstractEncodedPublicKeyBuilder} and specifies the
 * Ed448 algorithm. It reconstructs {@link java.security.PublicKey} instances
 * from {@link Ed448PublicKeySpec}, which carries the raw encoded form.
 * </p>
 *
 * <h2>Responsibilities</h2>
 * <ul>
 * <li>Provide the canonical JCA key factory algorithm name
 * ({@code "Ed448"}).</li>
 * <li>Extract the X.509-encoded key bytes from {@link Ed448PublicKeySpec}.</li>
 * <li>Delegate actual key reconstruction to
 * {@link java.security.KeyFactory}.</li>
 * </ul>
 *
 * <h2>Usage</h2> <pre>{@code
 * // Import an Ed448 public key from encoded bytes
 * Ed448PublicKeySpec spec = new Ed448PublicKeySpec(x509Bytes);
 * PublicKey key = new Ed448PublicKeyBuilder().importPublic(spec);
 * }</pre>
 *
 * <h2>Thread-safety</h2> Stateless and safe for concurrent use. Each call to
 * {@link zeroecho.core.spi.PublicKeyImporter#importPublic(AlgorithmKeySpec)}
 * creates a new {@link java.security.KeyFactory}.
 *
 * @since 1.0
 */
public final class Ed448PublicKeyBuilder extends AbstractEncodedPublicKeyBuilder<Ed448PublicKeySpec> {
    /**
     * Returns the canonical JCA key factory algorithm name for Ed448.
     *
     * @return the string {@code "Ed448"}
     */
    @Override
    protected String jcaKeyFactoryAlg() {
        return "Ed448";
    }

    /**
     * Returns the X.509-encoded public key bytes from the given specification.
     *
     * @param spec the {@link Ed448PublicKeySpec} holding encoded public key data
     * @return raw X.509-encoded public key bytes
     */
    @Override
    protected byte[] encodedX509(Ed448PublicKeySpec spec) {
        return spec.encoded();
    }
}
