org.refcodes.forwardsecrecy.InMemoryDecryptionServer Maven / Gradle / Ivy
// /////////////////////////////////////////////////////////////////////////////
// REFCODES.ORG
// =============================================================================
// This code is copyright (c) by Siegfried Steiner, Munich, Germany, distributed
// on an "AS IS" BASIS WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, and licen-
// sed under the following (see "http://en.wikipedia.org/wiki/Multi-licensing")
// licenses:
// =============================================================================
// GNU General Public License, v3.0 ("http://www.gnu.org/licenses/gpl-3.0.html")
// together with the GPL linking exception applied; as being applied by the GNU
// Classpath ("http://www.gnu.org/software/classpath/license.html")
// =============================================================================
// Apache License, v2.0 ("http://www.apache.org/licenses/TEXT-2.0")
// =============================================================================
// Please contact the copyright holding author(s) of the software artifacts in
// question for licensing issues not being covered by the above listed licenses,
// also regarding commercial licensing models or regarding the compatibility
// with other open source licenses.
// /////////////////////////////////////////////////////////////////////////////
package org.refcodes.forwardsecrecy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* The {@link InMemoryDecryptionServer} is a non-persisting implementation of
* the {@link DecryptionServer} managing the {@link CipherVersion} instances in
* memory only. This implementation provides means to easily set up a quick and
* dirty test setup. The {@link InMemoryDecryptionServer} is the counterpart of
* the {@link InMemoryEncryptionServer} which both work (not doing any
* persistence) hand in hand.
*/
public class InMemoryDecryptionServer implements DecryptionServer {
private final Map> _namespaceToCipherVersions = new HashMap<>();
private final CipherVersionFactory _cipherVersionFactory = new CipherVersionFactoryImpl();
// /////////////////////////////////////////////////////////////////////////
// METHODS:
// /////////////////////////////////////////////////////////////////////////
/**
* {@inheritDoc}
*/
@Override
public List getCipherVersions( String aNamespace, String aMessage, String aSignature ) {
return getCipherVersions( aNamespace );
}
// /////////////////////////////////////////////////////////////////////////
// IMPLEMENTATION SPECIFIC:
// /////////////////////////////////////////////////////////////////////////
/**
* Adds a cipher version to the server. Bad hack for testing purposes.
*
* @param aNamespace The namespace for which to add the cipher
* @param aCipherVersion The cipher version with cipher UID and cipher.
*
* @throws CipherUidAlreadyInUseException in case the given cipher UID has
* already been used.
*/
protected void addCipherVersion( String aNamespace, CipherVersion aCipherVersion ) throws CipherUidAlreadyInUseException {
final List theCipherVersions = getCipherVersions( aNamespace );
final CipherVersion theCipherVersion = _cipherVersionFactory.create( aCipherVersion.getUniversalId(), aCipherVersion.getCipher() );
if ( theCipherVersions.contains( theCipherVersion ) ) {
throw new CipherUidAlreadyInUseException( "A cipher version with the UID <{1}> of namespace <{0}> is already in use!", aNamespace, theCipherVersion.getUniversalId() );
}
theCipherVersions.add( theCipherVersion );
}
// /////////////////////////////////////////////////////////////////////////
// HELPER:
// /////////////////////////////////////////////////////////////////////////
/**
* Lazy getting cipher versions.
*
* @param aNameSsace The namespace for which to get the
* {@link CipherVersion}s
*
* @return The {@link CipherVersion}s or an empty list in case none have
* been created for the given namespace yet.
*/
private List getCipherVersions( String aNameSsace ) {
List theCipherVersions = _namespaceToCipherVersions.get( aNameSsace );
if ( theCipherVersions == null ) {
synchronized ( this ) {
theCipherVersions = _namespaceToCipherVersions.get( aNameSsace );
if ( theCipherVersions == null ) {
theCipherVersions = new ArrayList<>();
_namespaceToCipherVersions.put( aNameSsace, theCipherVersions );
}
}
}
return theCipherVersions;
}
}