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package org.spongycastle.openpgp.operator.bc;
import org.spongycastle.crypto.BlockCipher;
import org.spongycastle.crypto.BufferedBlockCipher;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.operator.PBEDataDecryptorFactory;
import org.spongycastle.openpgp.operator.PGPDataDecryptor;
/**
* A decryptor factory for handling PBE decryption operations.
*/
public class BcPBEDataDecryptorFactory
extends PBEDataDecryptorFactory
{
/**
* Base constructor.
*
* @param pass the passphrase to use as the primary source of key material.
* @param calculatorProvider a digest calculator provider to provide calculators to support the key generation calculation required.
*/
public BcPBEDataDecryptorFactory(char[] pass, BcPGPDigestCalculatorProvider calculatorProvider)
{
super(pass, calculatorProvider);
}
public byte[] recoverSessionData(int keyAlgorithm, byte[] key, byte[] secKeyData)
throws PGPException
{
try
{
if (secKeyData != null && secKeyData.length > 0)
{
BlockCipher engine = BcImplProvider.createBlockCipher(keyAlgorithm);
BufferedBlockCipher cipher = BcUtil.createSymmetricKeyWrapper(false, engine, key, new byte[engine.getBlockSize()]);
byte[] out = new byte[secKeyData.length];
int len = cipher.processBytes(secKeyData, 0, secKeyData.length, out, 0);
len += cipher.doFinal(out, len);
return out;
}
else
{
byte[] keyBytes = new byte[key.length + 1];
keyBytes[0] = (byte)keyAlgorithm;
System.arraycopy(key, 0, keyBytes, 1, key.length);
return keyBytes;
}
}
catch (Exception e)
{
throw new PGPException("Exception recovering session info", e);
}
}
public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
throws PGPException
{
BlockCipher engine = BcImplProvider.createBlockCipher(encAlgorithm);
return BcUtil.createDataDecryptor(withIntegrityPacket, engine, key);
}
}
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