/*
 * $Id: 7d7b8c6e472844a8e2c2bd40d38733372d866aed $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2015 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.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.bouncycastle.jcajce.provider.digest.*;

/**
 * Implementation for digests accessed directly from the BouncyCastle library bypassing
 * any provider definition.
 */
public class BouncyCastleDigest implements ExternalDigest {

    public MessageDigest getMessageDigest(String hashAlgorithm) throws GeneralSecurityException {
        String oid = DigestAlgorithms.getAllowedDigests(hashAlgorithm);
        if (oid == null)
            throw new NoSuchAlgorithmException(hashAlgorithm);
        if (oid.equals("1.2.840.113549.2.2")) { //MD2
            return new MD2.Digest();
        }
        else if (oid.equals("1.2.840.113549.2.5")) { //MD5
            return new MD5.Digest();
        }
        else if (oid.equals("1.3.14.3.2.26")) { //SHA1
            return new SHA1.Digest();
        }
        else if (oid.equals("2.16.840.1.101.3.4.2.4")) { //SHA224
            return new SHA224.Digest();
        }
        else if (oid.equals("2.16.840.1.101.3.4.2.1")) { //SHA256
            return new SHA256.Digest();
        }
        else if (oid.equals("2.16.840.1.101.3.4.2.2")) { //SHA384
            return new SHA384.Digest();
        }
        else if (oid.equals("2.16.840.1.101.3.4.2.3")) { //SHA512
            return new SHA512.Digest();
        }
        else if (oid.equals("1.3.36.3.2.2")) { //RIPEMD128
            return new RIPEMD128.Digest();
        }
        else if (oid.equals("1.3.36.3.2.1")) { //RIPEMD160
            return new RIPEMD160.Digest();
        }
        else if (oid.equals("1.3.36.3.2.3")) { //RIPEMD256
            return new RIPEMD256.Digest();
        }
        else if (oid.equals("1.2.643.2.2.9")) { //GOST3411
            return new GOST3411.Digest();
        }
        throw new NoSuchAlgorithmException(hashAlgorithm); //shouldn't get here
    }
}
