org.bouncycastle.openpgp.PGPPublicKeyRing Maven / Gradle / Ivy
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package org.bouncycastle.openpgp;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.bouncycastle.bcpg.BCPGInputStream;
import org.bouncycastle.bcpg.Packet;
import org.bouncycastle.bcpg.PacketTags;
import org.bouncycastle.bcpg.PublicKeyPacket;
import org.bouncycastle.bcpg.TrustPacket;
import org.bouncycastle.openpgp.operator.KeyFingerPrintCalculator;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Iterable;
/**
* Class to hold a single master public key and its subkeys.
*
* Often PGP keyring files consist of multiple master keys, if you are trying to process
* or construct one of these you should use the PGPPublicKeyRingCollection class.
*/
public class PGPPublicKeyRing
extends PGPKeyRing
implements Iterable
{
List keys;
public PGPPublicKeyRing(
byte[] encoding,
KeyFingerPrintCalculator fingerPrintCalculator)
throws IOException
{
this(new ByteArrayInputStream(encoding), fingerPrintCalculator);
}
private static List checkKeys(List keys)
{
List rv = new ArrayList(keys.size());
for (int i = 0; i != keys.size(); i++)
{
PGPPublicKey k = (PGPPublicKey)keys.get(i);
if (i == 0)
{
if (!k.isMasterKey())
{
throw new IllegalArgumentException("key 0 must be a master key");
}
}
else
{
if (k.isMasterKey())
{
throw new IllegalArgumentException("key 0 can be only master key");
}
}
rv.add(k);
}
return rv;
}
/**
* Base constructor from a list of keys representing a public key ring (a master key and its
* associated sub-keys).
*
* @param pubKeys the list of keys making up the ring.
*/
public PGPPublicKeyRing(
List pubKeys)
{
this.keys = checkKeys(pubKeys);
}
public PGPPublicKeyRing(
InputStream in,
KeyFingerPrintCalculator fingerPrintCalculator)
throws IOException
{
this.keys = new ArrayList();
BCPGInputStream pIn = wrap(in);
int initialTag = pIn.skipMarkerPackets();
if (initialTag != PacketTags.PUBLIC_KEY && initialTag != PacketTags.PUBLIC_SUBKEY)
{
throw new IOException(
"public key ring doesn't start with public key tag: " +
"tag 0x" + Integer.toHexString(initialTag));
}
PublicKeyPacket pubPk = readPublicKeyPacket(pIn);
TrustPacket trustPk = readOptionalTrustPacket(pIn);
// direct signatures and revocations
List keySigs = readSignaturesAndTrust(pIn);
List ids = new ArrayList();
List idTrusts = new ArrayList();
List idSigs = new ArrayList();
readUserIDs(pIn, ids, idTrusts, idSigs);
try
{
keys.add(new PGPPublicKey(pubPk, trustPk, keySigs, ids, idTrusts, idSigs, fingerPrintCalculator));
// Read subkeys
while (pIn.nextPacketTag() == PacketTags.PUBLIC_SUBKEY)
{
keys.add(readSubkey(pIn, fingerPrintCalculator));
}
}
catch (PGPException e)
{
throw new IOException("processing exception: " + e.toString());
}
}
/**
* Return the first public key in the ring.
*
* @return PGPPublicKey
*/
public PGPPublicKey getPublicKey()
{
return (PGPPublicKey)keys.get(0);
}
/**
* Return the public key referred to by the passed in keyID if it
* is present.
*
* @param keyID the full keyID of the key of interest.
* @return PGPPublicKey with matching keyID, null if it is not present.
*/
public PGPPublicKey getPublicKey(
long keyID)
{
for (int i = 0; i != keys.size(); i++)
{
PGPPublicKey k = (PGPPublicKey)keys.get(i);
if (keyID == k.getKeyID())
{
return k;
}
}
return null;
}
/**
* Return the public key with the passed in fingerprint if it
* is present.
*
* @param fingerprint the full fingerprint of the key of interest.
* @return PGPPublicKey with the matching fingerprint, null if it is not present.
*/
public PGPPublicKey getPublicKey(byte[] fingerprint)
{
for (int i = 0; i != keys.size(); i++)
{
PGPPublicKey k = (PGPPublicKey)keys.get(i);
if (Arrays.areEqual(fingerprint, k.getFingerprint()))
{
return k;
}
}
return null;
}
/**
* Return any keys carrying a signature issued by the key represented by keyID.
*
* @param keyID the key id to be matched against.
* @return an iterator (possibly empty) of PGPPublicKey objects carrying signatures from keyID.
*/
public Iterator getKeysWithSignaturesBy(long keyID)
{
List keysWithSigs = new ArrayList();
for (int i = 0; i != keys.size(); i++)
{
PGPPublicKey k = (PGPPublicKey)keys.get(i);
Iterator sigIt = k.getSignaturesForKeyID(keyID);
if (sigIt.hasNext())
{
keysWithSigs.add(k);
}
}
return keysWithSigs.iterator();
}
/**
* Return an iterator containing all the public keys.
*
* @return Iterator
*/
public Iterator getPublicKeys()
{
return Collections.unmodifiableList(keys).iterator();
}
/**
* Support method for Iterable where available.
*/
public Iterator iterator()
{
return getPublicKeys();
}
public byte[] getEncoded()
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
this.encode(bOut);
return bOut.toByteArray();
}
/**
* Return an encoding of the key ring, with trust packets stripped out if forTransfer is true.
*
* @param forTransfer if the purpose of encoding is to send key to other users.
* @return a encoded byte array representing the key.
* @throws IOException in case of encoding error.
*/
public byte[] getEncoded(boolean forTransfer)
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
this.encode(bOut, forTransfer);
return bOut.toByteArray();
}
public void encode(
OutputStream outStream)
throws IOException
{
encode(outStream, false);
}
/**
* Encode the key ring to outStream, with trust packets stripped out if forTransfer is true.
*
* @param outStream stream to write the key encoding to.
* @param forTransfer if the purpose of encoding is to send key to other users.
* @throws IOException in case of encoding error.
*/
public void encode(
OutputStream outStream,
boolean forTransfer)
throws IOException
{
for (int i = 0; i != keys.size(); i++)
{
PGPPublicKey k = (PGPPublicKey)keys.get(i);
k.encode(outStream, forTransfer);
}
}
/**
* Returns a new key ring with the public key passed in
* either added or replacing an existing one.
*
* @param pubRing the public key ring to be modified
* @param pubKey the public key to be inserted.
* @return a new keyRing
*/
public static PGPPublicKeyRing insertPublicKey(
PGPPublicKeyRing pubRing,
PGPPublicKey pubKey)
{
List keys = new ArrayList(pubRing.keys);
boolean found = false;
boolean masterFound = false;
for (int i = 0; i != keys.size();i++)
{
PGPPublicKey key = (PGPPublicKey)keys.get(i);
if (key.getKeyID() == pubKey.getKeyID())
{
found = true;
keys.set(i, pubKey);
}
if (key.isMasterKey())
{
masterFound = true;
}
}
if (!found)
{
if (pubKey.isMasterKey())
{
if (masterFound)
{
throw new IllegalArgumentException("cannot add a master key to a ring that already has one");
}
keys.add(0, pubKey);
}
else
{
keys.add(pubKey);
}
}
return new PGPPublicKeyRing(keys);
}
/**
* Returns a new key ring with the public key passed in
* removed from the key ring.
*
* @param pubRing the public key ring to be modified
* @param pubKey the public key to be removed.
* @return a new keyRing, null if pubKey is not found.
*/
public static PGPPublicKeyRing removePublicKey(
PGPPublicKeyRing pubRing,
PGPPublicKey pubKey)
{
List keys = new ArrayList(pubRing.keys);
boolean found = false;
for (int i = 0; i < keys.size();i++)
{
PGPPublicKey key = (PGPPublicKey)keys.get(i);
if (key.getKeyID() == pubKey.getKeyID())
{
found = true;
keys.remove(i);
}
}
if (!found)
{
return null;
}
return new PGPPublicKeyRing(keys);
}
static PublicKeyPacket readPublicKeyPacket(BCPGInputStream in)
throws IOException
{
Packet packet = in.readPacket();
if (!(packet instanceof PublicKeyPacket))
{
throw new IOException("unexpected packet in stream: " + packet);
}
return (PublicKeyPacket)packet;
}
static PGPPublicKey readSubkey(BCPGInputStream in, KeyFingerPrintCalculator fingerPrintCalculator)
throws IOException, PGPException
{
PublicKeyPacket pk = readPublicKeyPacket(in);
TrustPacket kTrust = readOptionalTrustPacket(in);
// PGP 8 actually leaves out the signature.
List sigList = readSignaturesAndTrust(in);
return new PGPPublicKey(pk, kTrust, sigList, fingerPrintCalculator);
}
}