/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * 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 http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.security;

import java.security.GeneralSecurityException;
import java.util.HashMap;

/**
 * Class that contains a map with the different encryption algorithms.
 */
public class EncryptionAlgorithms {

	/** Maps IDs of encryption algorithms with its human-readable name. */
	static final HashMap<String, String> algorithmNames = new HashMap<String, String>();

	static {
        algorithmNames.put("1.2.840.113549.1.1.1", "RSA");
        algorithmNames.put("1.2.840.10040.4.1", "DSA");
        algorithmNames.put("1.2.840.113549.1.1.2", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.4", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.5", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.14", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.11", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.12", "RSA");
        algorithmNames.put("1.2.840.113549.1.1.13", "RSA");
        algorithmNames.put("1.2.840.10040.4.3", "DSA");
        algorithmNames.put("2.16.840.1.101.3.4.3.1", "DSA");
        algorithmNames.put("2.16.840.1.101.3.4.3.2", "DSA");
        algorithmNames.put("1.3.14.3.2.29", "RSA");
        algorithmNames.put("1.3.36.3.3.1.2", "RSA");
        algorithmNames.put("1.3.36.3.3.1.3", "RSA");
        algorithmNames.put("1.3.36.3.3.1.4", "RSA");
        algorithmNames.put("1.2.643.2.2.19", "ECGOST3410");
	}

	/**
	 * Gets the algorithm name for a certain id.
	 * @param oid	an id (for instance "1.2.840.113549.1.1.1")
	 * @return	an algorithm name (for instance "RSA")
	 */
	public static String getAlgorithm(String oid) {
	    String ret = algorithmNames.get(oid);
	    if (ret == null)
	        return oid;
	    else
	        return ret;
	}
	
	/**
	 * Allows new oid to be added.
	 * @param oid
	 * @param name
	 */
	public static boolean addAlgorithm(String oid, String name) throws GeneralSecurityException{
		boolean status = false;
		if(oid!=null && !oid.equals("")){
			if(!algorithmNames.containsKey(oid)){
				algorithmNames.put(oid, name);
				status = true;
			}else if(algorithmNames.get(oid).equals(name)){
				status = false;
			} else{
				throw new GeneralSecurityException("already registered oid="+oid+", with name="+algorithmNames.get(oid));
			}
		} else{
			throw new GeneralSecurityException("Can not register oid's with null or empty");
		}
		return status;
	}     
}


