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package org.spongycastle.openpgp;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.spongycastle.bcpg.BCPGInputStream;
import org.spongycastle.bcpg.InputStreamPacket;
import org.spongycastle.bcpg.PacketTags;
import org.spongycastle.bcpg.PublicKeyEncSessionPacket;
import org.spongycastle.bcpg.SymmetricKeyEncSessionPacket;
/**
* A holder for a list of PGP encryption method packets and the encrypted data associated with them.
* <p/>
* This holder supports reading a sequence of the following encryption methods, followed by an
* encrypted data packet:
* <ul>
* <li>{@link PacketTags#SYMMETRIC_KEY_ENC_SESSION} - produces a {@link PGPPBEEncryptedData}</li>
* <li>{@link PacketTags#PUBLIC_KEY_ENC_SESSION} - produces a {@link PGPPublicKeyEncryptedData}</li>
* </ul>
* <p/>
* All of the objects returned from this holder share a reference to the same encrypted data input
* stream, which can only be consumed once.
*/
public class PGPEncryptedDataList
{
List list = new ArrayList();
InputStreamPacket data;
/**
* Construct an encrypted data packet holder, reading PGP encrypted method packets and an
* encrytped data packet from the stream.
* <p/>
* The next packet in the stream should be one of {@link PacketTags#SYMMETRIC_KEY_ENC_SESSION}
* or {@link PacketTags#PUBLIC_KEY_ENC_SESSION}.
*
* @param pIn the PGP object stream being read.
* @throws IOException if an error occurs reading from the PGP input.
*/
public PGPEncryptedDataList(
BCPGInputStream pIn)
throws IOException
{
while (pIn.nextPacketTag() == PacketTags.PUBLIC_KEY_ENC_SESSION
|| pIn.nextPacketTag() == PacketTags.SYMMETRIC_KEY_ENC_SESSION)
{
list.add(pIn.readPacket());
}
data = (InputStreamPacket)pIn.readPacket();
for (int i = 0; i != list.size(); i++)
{
if (list.get(i) instanceof SymmetricKeyEncSessionPacket)
{
list.set(i, new PGPPBEEncryptedData((SymmetricKeyEncSessionPacket)list.get(i), data));
}
else
{
list.set(i, new PGPPublicKeyEncryptedData((PublicKeyEncSessionPacket)list.get(i), data));
}
}
}
/**
* Gets the encryption method object at the specified index.
*
* @param index the encryption method to obtain (0 based).
*/
public Object get(
int index)
{
return list.get(index);
}
/**
* Gets the number of encryption methods in this list.
*/
public int size()
{
return list.size();
}
/**
* Returns <code>true</code> iff there are 0 encryption methods in this list.
*/
public boolean isEmpty()
{
return list.isEmpty();
}
/**
* @deprecated misspelt - use getEncryptedDataObjects()
*/
public Iterator getEncyptedDataObjects()
{
return list.iterator();
}
/**
* Returns an iterator over the encryption method objects held in this list, in the order they
* appeared in the stream they are read from.
*/
public Iterator getEncryptedDataObjects()
{
return list.iterator();
}
}
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