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package org.spongycastle.openpgp;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.spongycastle.bcpg.BCPGInputStream;
import org.spongycastle.bcpg.PacketTags;
import org.spongycastle.openpgp.operator.KeyFingerPrintCalculator;
import org.spongycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
/**
* General class for reading a PGP object stream.
* <p>
* Note: if this class finds a PGPPublicKey or a PGPSecretKey it
* will create a PGPPublicKeyRing, or a PGPSecretKeyRing for each
* key found. If all you are trying to do is read a key ring file use
* either PGPPublicKeyRingCollection or PGPSecretKeyRingCollection.
*/
public class PGPObjectFactory
{
private BCPGInputStream in;
private KeyFingerPrintCalculator fingerPrintCalculator;
public PGPObjectFactory(
InputStream in)
{
this(in, new JcaKeyFingerprintCalculator());
}
/**
* Create an object factor suitable for reading keys, key rings and key ring collections.
*
* @param in stream to read from
* @param fingerPrintCalculator calculator to use in key finger print calculations.
*/
public PGPObjectFactory(
InputStream in,
KeyFingerPrintCalculator fingerPrintCalculator)
{
this.in = new BCPGInputStream(in);
this.fingerPrintCalculator = fingerPrintCalculator;
}
public PGPObjectFactory(
byte[] bytes)
{
this(new ByteArrayInputStream(bytes));
}
/**
* Create an object factor suitable for reading keys, key rings and key ring collections.
*
* @param bytes stream to read from
* @param fingerPrintCalculator calculator to use in key finger print calculations.
*/
public PGPObjectFactory(
byte[] bytes,
KeyFingerPrintCalculator fingerPrintCalculator)
{
this(new ByteArrayInputStream(bytes), fingerPrintCalculator);
}
/**
* Return the next object in the stream, or null if the end is reached.
*
* @return Object
* @throws IOException on a parse error
*/
public Object nextObject()
throws IOException
{
List l;
switch (in.nextPacketTag())
{
case -1:
return null;
case PacketTags.SIGNATURE:
l = new ArrayList();
while (in.nextPacketTag() == PacketTags.SIGNATURE)
{
try
{
l.add(new PGPSignature(in));
}
catch (PGPException e)
{
throw new IOException("can't create signature object: " + e);
}
}
return new PGPSignatureList((PGPSignature[])l.toArray(new PGPSignature[l.size()]));
case PacketTags.SECRET_KEY:
try
{
return new PGPSecretKeyRing(in, fingerPrintCalculator);
}
catch (PGPException e)
{
throw new IOException("can't create secret key object: " + e);
}
case PacketTags.SECRET_SUBKEY:
try
{
return PGPSecretKeyRing.readSubkey(in, fingerPrintCalculator);
}
catch (PGPException e)
{
throw new IOException("processing error: " + e.getMessage());
}
case PacketTags.PUBLIC_KEY:
return new PGPPublicKeyRing(in, fingerPrintCalculator);
case PacketTags.PUBLIC_SUBKEY:
try
{
return PGPPublicKeyRing.readSubkey(in, fingerPrintCalculator);
}
catch (PGPException e)
{
throw new IOException("processing error: " + e.getMessage());
}
case PacketTags.COMPRESSED_DATA:
return new PGPCompressedData(in);
case PacketTags.LITERAL_DATA:
return new PGPLiteralData(in);
case PacketTags.PUBLIC_KEY_ENC_SESSION:
case PacketTags.SYMMETRIC_KEY_ENC_SESSION:
return new PGPEncryptedDataList(in);
case PacketTags.ONE_PASS_SIGNATURE:
l = new ArrayList();
while (in.nextPacketTag() == PacketTags.ONE_PASS_SIGNATURE)
{
try
{
l.add(new PGPOnePassSignature(in));
}
catch (PGPException e)
{
throw new IOException("can't create one pass signature object: " + e);
}
}
return new PGPOnePassSignatureList((PGPOnePassSignature[])l.toArray(new PGPOnePassSignature[l.size()]));
case PacketTags.MARKER:
return new PGPMarker(in);
case PacketTags.EXPERIMENTAL_1:
case PacketTags.EXPERIMENTAL_2:
case PacketTags.EXPERIMENTAL_3:
case PacketTags.EXPERIMENTAL_4:
return in.readPacket();
}
throw new IOException("unknown object in stream: " + in.nextPacketTag());
}
}
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