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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Bcpg.OpenPgp
{
/// <remarks>
/// Class to hold a single master public key and its subkeys.
/// <p>
/// Often PGP keyring files consist of multiple master keys, if you are trying to process
/// or construct one of these you should use the <c>PgpPublicKeyRingBundle</c> class.
/// </p>
/// </remarks>
public class PgpPublicKeyRing
: PgpKeyRing
{
private readonly IList keys;
public PgpPublicKeyRing(
byte[] encoding)
: this(new MemoryStream(encoding, false))
{
}
internal PgpPublicKeyRing(
IList pubKeys)
{
this.keys = pubKeys;
}
public PgpPublicKeyRing(
Stream inputStream)
{
this.keys = Platform.CreateArrayList();
BcpgInputStream bcpgInput = BcpgInputStream.Wrap(inputStream);
PacketTag initialTag = bcpgInput.NextPacketTag();
if (initialTag != PacketTag.PublicKey && initialTag != PacketTag.PublicSubkey)
{
throw new IOException("public key ring doesn't start with public key tag: "
+ "tag 0x" + ((int)initialTag).ToString("X"));
}
PublicKeyPacket pubPk = ReadPublicKeyPacket(bcpgInput);
TrustPacket trustPk = ReadOptionalTrustPacket(bcpgInput);
// direct signatures and revocations
IList keySigs = ReadSignaturesAndTrust(bcpgInput);
IList ids, idTrusts, idSigs;
ReadUserIDs(bcpgInput, out ids, out idTrusts, out idSigs);
keys.Add(new PgpPublicKey(pubPk, trustPk, keySigs, ids, idTrusts, idSigs));
// Read subkeys
while (bcpgInput.NextPacketTag() == PacketTag.PublicSubkey)
{
keys.Add(ReadSubkey(bcpgInput));
}
}
/// <summary>Return the first public key in the ring.</summary>
public virtual PgpPublicKey GetPublicKey()
{
return (PgpPublicKey) keys[0];
}
/// <summary>Return the public key referred to by the passed in key ID if it is present.</summary>
public virtual PgpPublicKey GetPublicKey(
long keyId)
{
foreach (PgpPublicKey k in keys)
{
if (keyId == k.KeyId)
{
return k;
}
}
return null;
}
/// <summary>Allows enumeration of all the public keys.</summary>
/// <returns>An <c>IEnumerable</c> of <c>PgpPublicKey</c> objects.</returns>
public virtual IEnumerable GetPublicKeys()
{
return new EnumerableProxy(keys);
}
public virtual byte[] GetEncoded()
{
MemoryStream bOut = new MemoryStream();
Encode(bOut);
return bOut.ToArray();
}
public virtual void Encode(
Stream outStr)
{
if (outStr == null)
throw new ArgumentNullException("outStr");
foreach (PgpPublicKey k in keys)
{
k.Encode(outStr);
}
}
/// <summary>
/// Returns a new key ring with the public key passed in either added or
/// replacing an existing one.
/// </summary>
/// <param name="pubRing">The public key ring to be modified.</param>
/// <param name="pubKey">The public key to be inserted.</param>
/// <returns>A new <c>PgpPublicKeyRing</c></returns>
public static PgpPublicKeyRing InsertPublicKey(
PgpPublicKeyRing pubRing,
PgpPublicKey pubKey)
{
IList keys = Platform.CreateArrayList(pubRing.keys);
bool found = false;
bool masterFound = false;
for (int i = 0; i != keys.Count; i++)
{
PgpPublicKey key = (PgpPublicKey) keys[i];
if (key.KeyId == pubKey.KeyId)
{
found = true;
keys[i] = pubKey;
}
if (key.IsMasterKey)
{
masterFound = true;
}
}
if (!found)
{
if (pubKey.IsMasterKey)
{
if (masterFound)
throw new ArgumentException("cannot add a master key to a ring that already has one");
keys.Insert(0, pubKey);
}
else
{
keys.Add(pubKey);
}
}
return new PgpPublicKeyRing(keys);
}
/// <summary>Returns a new key ring with the public key passed in removed from the key ring.</summary>
/// <param name="pubRing">The public key ring to be modified.</param>
/// <param name="pubKey">The public key to be removed.</param>
/// <returns>A new <c>PgpPublicKeyRing</c>, or null if pubKey is not found.</returns>
public static PgpPublicKeyRing RemovePublicKey(
PgpPublicKeyRing pubRing,
PgpPublicKey pubKey)
{
IList keys = Platform.CreateArrayList(pubRing.keys);
bool found = false;
for (int i = 0; i < keys.Count; i++)
{
PgpPublicKey key = (PgpPublicKey) keys[i];
if (key.KeyId == pubKey.KeyId)
{
found = true;
keys.RemoveAt(i);
}
}
return found ? new PgpPublicKeyRing(keys) : null;
}
internal static PublicKeyPacket ReadPublicKeyPacket(BcpgInputStream bcpgInput)
{
Packet packet = bcpgInput.ReadPacket();
if (!(packet is PublicKeyPacket))
throw new IOException("unexpected packet in stream: " + packet);
return (PublicKeyPacket)packet;
}
internal static PgpPublicKey ReadSubkey(BcpgInputStream bcpgInput)
{
PublicKeyPacket pk = ReadPublicKeyPacket(bcpgInput);
TrustPacket kTrust = ReadOptionalTrustPacket(bcpgInput);
// PGP 8 actually leaves out the signature.
IList sigList = ReadSignaturesAndTrust(bcpgInput);
return new PgpPublicKey(pk, kTrust, sigList);
}
}
}
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