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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.bc.BcPGPObjectFactory;
import org.spongycastle.openpgp.jcajce.JcaPGPObjectFactory;
import org.spongycastle.openpgp.operator.KeyFingerPrintCalculator;
import org.spongycastle.openpgp.operator.bc.BcKeyFingerprintCalculator;
/**
* General class for reading a PGP object stream.
* <p/>
* Note: if this class finds a {@link PGPPublicKey} or a {@link PGPSecretKey} it will create a
* {@link PGPPublicKeyRing}, or a {@link PGPSecretKeyRing} for each key found. If all you are trying
* to do is read a key ring file use either {@link PGPPublicKeyRingCollection} or
* {@link PGPSecretKeyRingCollection}.
* <p/>
* This factory supports reading the following types of objects:
* <ul>
* <li>{@link PacketTags#SIGNATURE} - produces a {@link PGPSignatureList}</li>
* <li>{@link PacketTags#SECRET_KEY} - produces a {@link PGPSecretKeyRing}</li>
* <li>{@link PacketTags#PUBLIC_KEY} - produces a {@link PGPPublicKeyRing}</li>
* <li>{@link PacketTags#PUBLIC_SUBKEY} - produces a {@link PGPPublicKey}</li>
* <li>{@link PacketTags#COMPRESSED_DATA} - produces a {@link PGPCompressedData}</li>
* <li>{@link PacketTags#LITERAL_DATA} - produces a {@link PGPLiteralData}</li>
* <li>{@link PacketTags#PUBLIC_KEY_ENC_SESSION} - produces a {@link PGPEncryptedDataList}</li>
* <li>{@link PacketTags#SYMMETRIC_KEY_ENC_SESSION} - produces a {@link PGPEncryptedDataList}</li>
* <li>{@link PacketTags#ONE_PASS_SIGNATURE} - produces a {@link PGPOnePassSignatureList}</li>
* <li>{@link PacketTags#MARKER} - produces a {@link PGPMarker}</li>
* </ul>
*/
public class PGPObjectFactory
{
private BCPGInputStream in;
private KeyFingerPrintCalculator fingerPrintCalculator;
/**
* @deprecated use {@link JcaPGPObjectFactory} or {@link BcPGPObjectFactory}
*/
public PGPObjectFactory(
InputStream in)
{
this(in, new BcKeyFingerprintCalculator());
}
/**
* Create an object factory suitable for reading PGP objects such as keys, key rings and key
* ring collections, or PGP encrypted data.
*
* @param in stream to read PGP data 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;
}
/**
* @deprecated use JcaPGPObjectFactory or BcPGPObjectFactory
*/
public PGPObjectFactory(
byte[] bytes)
{
this(new ByteArrayInputStream(bytes));
}
/**
* Create an object factory suitable for reading PGP objects such as keys, key rings and key
* ring collections, or PGP encrypted data.
*
* @param bytes PGP encoded data.
* @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 <code>null</code> if the end of stream is reached.
*
* @return one of the supported objects - see class docs for details.
* @throws IOException if an error occurs reading from the wrapped stream or parsing data.
*/
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.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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