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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.
package org.bouncycastle.openpgp;
import java.io.EOFException;
import java.io.InputStream;
import org.bouncycastle.bcpg.AEADEncDataPacket;
import org.bouncycastle.bcpg.BCPGInputStream;
import org.bouncycastle.bcpg.InputStreamPacket;
import org.bouncycastle.bcpg.PublicKeyEncSessionPacket;
import org.bouncycastle.bcpg.SymmetricEncIntegrityPacket;
import org.bouncycastle.bcpg.SymmetricKeyAlgorithmTags;
import org.bouncycastle.openpgp.operator.PGPDataDecryptor;
import org.bouncycastle.openpgp.operator.PGPDataDecryptorFactory;
import org.bouncycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import org.bouncycastle.openpgp.operator.SessionKeyDataDecryptorFactory;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.TeeInputStream;
/**
* A public key encrypted data object.
*/
public class PGPPublicKeyEncryptedData
extends PGPEncryptedData
{
PublicKeyEncSessionPacket keyData;
PGPPublicKeyEncryptedData(
PublicKeyEncSessionPacket keyData,
InputStreamPacket encData)
{
super(encData);
this.keyData = keyData;
}
private boolean confirmCheckSum(
byte[] sessionInfo)
{
int check = 0;
for (int i = 1; i != sessionInfo.length - 2; i++)
{
check += sessionInfo[i] & 0xff;
}
return (sessionInfo[sessionInfo.length - 2] == (byte)(check >> 8))
&& (sessionInfo[sessionInfo.length - 1] == (byte)(check));
}
/**
* Return the keyID for the key used to encrypt the data.
*
* @return long
*/
public long getKeyID()
{
return keyData.getKeyID();
}
/**
* Return the symmetric key algorithm required to decrypt the data protected by this object.
*
* @param dataDecryptorFactory decryptor factory to use to recover the session data.
* @return the identifier of the {@link SymmetricKeyAlgorithmTags encryption algorithm} used to
* encrypt this object.
* @throws PGPException if the session data cannot be recovered.
*/
public int getSymmetricAlgorithm(
PublicKeyDataDecryptorFactory dataDecryptorFactory)
throws PGPException
{
byte[] plain = dataDecryptorFactory.recoverSessionData(keyData.getAlgorithm(), keyData.getEncSessionKey());
return plain[0];
}
/**
* Return the symmetric session key required to decrypt the data protected by this object.
*
* @param dataDecryptorFactory decryptor factory to use to recover the session data.
* @return session key used to decrypt the data protected by this object
* @throws PGPException if the session data cannot be recovered.
*/
public PGPSessionKey getSessionKey(
PublicKeyDataDecryptorFactory dataDecryptorFactory)
throws PGPException
{
byte[] sessionData = dataDecryptorFactory.recoverSessionData(keyData.getAlgorithm(), keyData.getEncSessionKey());
if (!confirmCheckSum(sessionData))
{
throw new PGPKeyValidationException("key checksum failed");
}
return new PGPSessionKey(sessionData[0] & 0xff, Arrays.copyOfRange(sessionData, 1, sessionData.length - 2));
}
/**
* Open an input stream which will provide the decrypted data protected by this object.
*
* @param dataDecryptorFactory decryptor factory to use to recover the session data and provide the stream.
* @return the resulting input stream
* @throws PGPException if the session data cannot be recovered or the stream cannot be created.
*/
public InputStream getDataStream(
PublicKeyDataDecryptorFactory dataDecryptorFactory)
throws PGPException
{
return getDataStream(dataDecryptorFactory, getSessionKey(dataDecryptorFactory));
}
/**
* @deprecated will be removed in 1.74, use PGPEncryptedDataList.extractSessionKeyEncryptedData() and then apply the dataDecryptorFactory.
*/
public InputStream getDataStream(
SessionKeyDataDecryptorFactory dataDecryptorFactory)
throws PGPException
{
return getDataStream(dataDecryptorFactory, dataDecryptorFactory.getSessionKey());
}
/**
* Open an input stream which will provide the decrypted data protected by this object.
*
* @param dataDecryptorFactory decryptor factory to use to recover the session data and provide the stream.
* @param sessionKey the session key for the stream.
* @return the resulting input stream
* @throws PGPException if the session data cannot be recovered or the stream cannot be created.
*/
private InputStream getDataStream(
PGPDataDecryptorFactory dataDecryptorFactory,
PGPSessionKey sessionKey)
throws PGPException
{
if (sessionKey.getAlgorithm() != SymmetricKeyAlgorithmTags.NULL)
{
try
{
if (encData instanceof AEADEncDataPacket)
{
AEADEncDataPacket aeadData = (AEADEncDataPacket)encData;
if (aeadData.getAlgorithm() != sessionKey.getAlgorithm())
{
throw new PGPException("session key and AEAD algorithm mismatch");
}
PGPDataDecryptor dataDecryptor = dataDecryptorFactory.createDataDecryptor(aeadData.getAEADAlgorithm(), aeadData.getIV(), aeadData.getChunkSize(), sessionKey.getAlgorithm(), sessionKey.getKey());
BCPGInputStream encIn = encData.getInputStream();
encStream = new BCPGInputStream(dataDecryptor.getInputStream(encIn));
}
else
{
boolean withIntegrityPacket = encData instanceof SymmetricEncIntegrityPacket;
PGPDataDecryptor dataDecryptor = dataDecryptorFactory.createDataDecryptor(withIntegrityPacket, sessionKey.getAlgorithm(), sessionKey.getKey());
BCPGInputStream encIn = encData.getInputStream();
encStream = new BCPGInputStream(dataDecryptor.getInputStream(encIn));
if (withIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
integrityCalculator = dataDecryptor.getIntegrityCalculator();
encStream = new TeeInputStream(truncStream, integrityCalculator.getOutputStream());
}
byte[] iv = new byte[dataDecryptor.getBlockSize()];
for (int i = 0; i != iv.length; i++)
{
int ch = encStream.read();
if (ch < 0)
{
throw new EOFException("unexpected end of stream.");
}
iv[i] = (byte)ch;
}
int v1 = encStream.read();
int v2 = encStream.read();
if (v1 < 0 || v2 < 0)
{
throw new EOFException("unexpected end of stream.");
}
//
// some versions of PGP appear to produce 0 for the extra
// bytes rather than repeating the two previous bytes
//
/*
* Commented out in the light of the oracle attack.
if (iv[iv.length - 2] != (byte)v1 && v1 != 0)
{
throw new PGPDataValidationException("data check failed.");
}
if (iv[iv.length - 1] != (byte)v2 && v2 != 0)
{
throw new PGPDataValidationException("data check failed.");
}
*/
}
return encStream;
}
catch (PGPException e)
{
throw e;
}
catch (Exception e)
{
throw new PGPException("Exception starting decryption", e);
}
}
else
{
return encData.getInputStream();
}
}
public int getAlgorithm()
{
return keyData.getAlgorithm();
}
public int getVersion()
{
return keyData.getVersion();
}
}