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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.8 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.bcpg;

import java.io.IOException;

/**
 * Secret key of type {@link PublicKeyAlgorithmTags#X448}.
 * This type was introduced with RFC9580 and can be used with v4, v6 keys.
 * Note however, that legacy implementations might not understand this key type yet.
 * For a key type compatible with legacy v4 implementations, see {@link ECDHPublicBCPGKey} with
 * {@link PublicKeyAlgorithmTags#ECDH}.
 *
 * @see 
 *     OpenPGP - Algorithm-Specific Part for X448 Keys
 */
public class X448SecretBCPGKey
    extends OctetArrayBCPGKey
{
    // 56 octets of the native secret key
    public static final int LENGTH = 56;

    public X448SecretBCPGKey(BCPGInputStream in)
            throws IOException
    {
        super(LENGTH, in);
    }

    public X448SecretBCPGKey(byte[] key)
    {
        super(LENGTH, key);
    }
}