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package java.security.spec;

import java.util.Objects;

/**

 * A class representing elliptic curve private keys as defined in

 * <a href="https://tools.ietf.org/html/rfc8032">RFC 8032: Edwards-Curve

 * Digital Signature Algorithm (EdDSA)</a>, including the curve and other

 * algorithm parameters. The private key is a bit string represented using

 * a byte array. This class only supports bit string lengths that are a

 * multiple of 8.

 *

 * @since 15

 */

public final class EdECPrivateKeySpec implements KeySpec {

    private final NamedParameterSpec params;

    private final byte[] bytes;

    /**

     * Construct a private key spec using the supplied parameters and

     * bit string.

     *

     * @param params the algorithm parameters.

     * @param bytes the key as a byte array. This array is copied

     *              to protect against subsequent modification.

     *

     * @throws NullPointerException if {@code params} or {@code bytes}

     *                              is null.

     */

    public EdECPrivateKeySpec(NamedParameterSpec params, byte[] bytes) {

        Objects.requireNonNull(params, "params must not be null");

        Objects.requireNonNull(bytes, "bytes must not be null");

        this.params = params;

        this.bytes = bytes.clone();

    }

    /**

     * Get the algorithm parameters that define the curve and other settings.

     *

     * @return the algorithm parameters.

     */

    public NamedParameterSpec getParams() {

        return params;

    }

    /**

     * Get the byte array representing the private key. A new copy of the array

     * is returned each time this method is called.

     *

     * @return the private key as a byte array.

     */

    public byte[] getBytes() {

        return bytes.clone();

    }

}