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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.bcpg;

import java.io.IOException;

/**
 * Secret key of type {@link PublicKeyAlgorithmTags#X25519}.
 * This type was introduced with Crypto-Refresh 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 ECSecretBCPGKey} with
 * {@link PublicKeyAlgorithmTags#ECDH}.
 * Note: Contrary to {@link ECSecretBCPGKey} using {@link PublicKeyAlgorithmTags#ECDH}, which uses big-endian
 * MPI encoding to encode the secret key material, {@link X25519SecretBCPGKey} uses native little-endian encoding.
 *
 * @see 
 *     Crypto-Refresh - Algorithm-Specific Part for X25519 Keys
 */
public class X25519SecretBCPGKey
    extends OctetArrayBCPGKey
{
    // 32 octets of the native secret key
    public static final int LENGTH = 32;

    public X25519SecretBCPGKey(BCPGInputStream in)
            throws IOException
    {
        super(LENGTH, in);
    }

    public X25519SecretBCPGKey(byte[] key)
    {
        super(LENGTH, key);
    }
}