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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.signatures;

import java.security.GeneralSecurityException;
import java.security.MessageDigest;

/**
 * ExternalDigest allows the use of implementations of {@link java.security.MessageDigest} other than {@link com.itextpdf.signatures.BouncyCastleDigest}.
 */
public interface IExternalDigest {

    /**
     * Returns the MessageDigest associated with the provided hashing algorithm.
     *
     * @param hashAlgorithm                 String value representing the hashing algorithm
     * @return MessageDigest                MessageDigest object
     * @throws GeneralSecurityException     Thrown when something goes wrong in calculating the digest
     */
    MessageDigest getMessageDigest(String hashAlgorithm) throws GeneralSecurityException;
}