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package gnu.crypto.sig;
// ----------------------------------------------------------------------------
// $Id: SignatureFactory.java,v 1.4 2003/09/27 00:00:30 raif Exp $
//
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 59 Temple Place - Suite 330,
// Boston, MA 02111-1307
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.Registry;
import gnu.crypto.sig.dss.DSSSignature;
import gnu.crypto.sig.rsa.RSAPSSSignature;
import gnu.crypto.sig.rsa.RSAPKCS1V1_5Signature;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* A Factory to instantiate signature-with-appendix handlers.
*
* @version $Revision: 1.4 $
*/
public class SignatureFactory {
// Constants and variables
// -------------------------------------------------------------------------
// Constructor(s)
// -------------------------------------------------------------------------
/** Trivial constructor to enforce Singleton pattern. */
private SignatureFactory() {
super();
}
// Class methods
// -------------------------------------------------------------------------
/**
* Returns an instance of a signature-with-appendix scheme given its name.
*
* @param ssa the case-insensitive signature-with-appendix scheme name.
* @return an instance of the scheme, or null if none found.
*/
public static final ISignature getInstance(String ssa) {
if (ssa == null) {
return null;
}
ssa = ssa.trim();
ISignature result = null;
if (ssa.equalsIgnoreCase(Registry.DSA_SIG) || ssa.equals(Registry.DSS_SIG)) {
result = new DSSSignature();
} else if (ssa.equalsIgnoreCase(Registry.RSA_PSS_SIG)) {
result = new RSAPSSSignature();
} else if (ssa.equalsIgnoreCase(Registry.RSA_PKCS1_V1_5_SIG)) {
result = new RSAPKCS1V1_5Signature();
}
return result;
}
/**
* Returns a {@link Set} of signature-with-appendix scheme names supported
* by this Factory.
*
* @return a {@link Set} of signature-with-appendix scheme names (Strings).
*/
public static final Set getNames() {
HashSet hs = new HashSet();
hs.add(Registry.DSS_SIG);
hs.add(Registry.RSA_PSS_SIG);
hs.add(Registry.RSA_PKCS1_V1_5_SIG);
return Collections.unmodifiableSet(hs);
}
// Instance methods
// -------------------------------------------------------------------------
}