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/**
* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
*
* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
*/
package org.spongycastle.openpgp.operator.jcajce;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPublicKeyEncryptedData;
import org.spongycastle.openpgp.operator.PGPDataDecryptor;
import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import java.nio.ByteBuffer;
import java.util.Map;
public class CachingDataDecryptorFactory implements PublicKeyDataDecryptorFactory
{
private final PublicKeyDataDecryptorFactory mWrappedDecryptor;
private final Map<ByteBuffer, byte[]> mSessionKeyCache;
private OperatorHelper mOperatorHelper;
public CachingDataDecryptorFactory(String providerName,
final Map<ByteBuffer,byte[]> sessionKeyCache)
{
mWrappedDecryptor = null;
mSessionKeyCache = sessionKeyCache;
mOperatorHelper = new OperatorHelper(new NamedJcaJceHelper(providerName));
}
public CachingDataDecryptorFactory(PublicKeyDataDecryptorFactory wrapped,
final Map<ByteBuffer,byte[]> sessionKeyCache)
{
mWrappedDecryptor = wrapped;
mSessionKeyCache = sessionKeyCache;
}
public boolean hasCachedSessionData(PGPPublicKeyEncryptedData encData) throws PGPException {
ByteBuffer bi = ByteBuffer.wrap(encData.getSessionKey()[0]);
return mSessionKeyCache.containsKey(bi);
}
public Map<ByteBuffer, byte[]> getCachedSessionKeys() {
return mSessionKeyCache;
}
public boolean canDecrypt() {
return mWrappedDecryptor != null;
}
@Override
public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData) throws PGPException {
ByteBuffer bi = ByteBuffer.wrap(secKeyData[0]); // encoded MPI
if (mSessionKeyCache.containsKey(bi)) {
return mSessionKeyCache.get(bi);
}
byte[] sessionData = mWrappedDecryptor.recoverSessionData(keyAlgorithm, secKeyData);
mSessionKeyCache.put(bi, sessionData);
return sessionData;
}
@Override
public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
throws PGPException {
if (mWrappedDecryptor != null) {
return mWrappedDecryptor.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
}
return mOperatorHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
}
}
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