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Stateless OpenPGP Protocol API for Java
There is a newer version: 10.0.3
// SPDX-FileCopyrightText: 2021 Paul Schaub 
//
// SPDX-License-Identifier: Apache-2.0

package sop;

import sop.operation.Armor;
import sop.operation.Dearmor;
import sop.operation.Decrypt;
import sop.operation.Encrypt;
import sop.operation.ExtractCert;
import sop.operation.GenerateKey;
import sop.operation.InlineDetach;
import sop.operation.InlineSign;
import sop.operation.InlineVerify;
import sop.operation.DetachedSign;
import sop.operation.DetachedVerify;
import sop.operation.ListProfiles;
import sop.operation.Version;

/**
 * Stateless OpenPGP Interface.
 * This class provides a stateless interface to various OpenPGP related operations.
 * 

 * Note: Subcommand objects acquired by calling any method of this interface are not intended for reuse.
 * If you for example need to generate multiple keys, make a dedicated call to {@link #generateKey()} once per
 * key generation.
 */
public interface SOP {

    /**
     * Get information about the implementations name and version.
     *
     * @return version
     */
    Version version();

    /**
     * Generate a secret key.
     * Customize the operation using the builder {@link GenerateKey}.
     *
     * @return builder instance
     */
    GenerateKey generateKey();

    /**
     * Extract a certificate (public key) from a secret key.
     * Customize the operation using the builder {@link ExtractCert}.
     *
     * @return builder instance
     */
    ExtractCert extractCert();

    /**
     * Create detached signatures.
     * Customize the operation using the builder {@link DetachedSign}.
     *
     * If you want to sign a message inline, use {@link #inlineSign()} instead.
     *
     * @return builder instance
     */
    default DetachedSign sign() {
        return detachedSign();
    }

    /**
     * Create detached signatures.
     * Customize the operation using the builder {@link DetachedSign}.
     *
     * If you want to sign a message inline, use {@link #inlineSign()} instead.
     *
     * @return builder instance
     */
    DetachedSign detachedSign();

    /**
     * Sign a message using inline signatures.
     *
     * If you need to create detached signatures, use {@link #detachedSign()} instead.
     *
     * @return builder instance
     */
    InlineSign inlineSign();

    /**
     * Verify detached signatures.
     * Customize the operation using the builder {@link DetachedVerify}.
     *
     * If you need to verify an inline-signed message, use {@link #inlineVerify()} instead.
     *
     * @return builder instance
     */
    default DetachedVerify verify() {
        return detachedVerify();
    }

    /**
     * Verify detached signatures.
     * Customize the operation using the builder {@link DetachedVerify}.
     *
     * If you need to verify an inline-signed message, use {@link #inlineVerify()} instead.
     *
     * @return builder instance
     */
    DetachedVerify detachedVerify();

    /**
     * Verify signatures of an inline-signed message.
     *
     * If you need to verify detached signatures over a message, use {@link #detachedVerify()} instead.
     *
     * @return builder instance
     */
    InlineVerify inlineVerify();

    /**
     * Detach signatures from an inline signed message.
     *
     * @return builder instance
     */
    InlineDetach inlineDetach();

    /**
     * Encrypt a message.
     * Customize the operation using the builder {@link Encrypt}.
     *
     * @return builder instance
     */
    Encrypt encrypt();

    /**
     * Decrypt a message.
     * Customize the operation using the builder {@link Decrypt}.
     *
     * @return builder instance
     */
    Decrypt decrypt();

    /**
     * Convert binary OpenPGP data to ASCII.
     * Customize the operation using the builder {@link Armor}.
     *
     * @return builder instance
     */
    Armor armor();

    /**
     * Converts ASCII armored OpenPGP data to binary.
     * Customize the operation using the builder {@link Dearmor}.
     *
     * @return builder instance
     */
    Dearmor dearmor();

    /**
     * List supported {@link Profile Profiles} of a subcommand.
     *
     * @return builder instance
     */
    ListProfiles listProfiles();
}