public GarlicMessage(EGGarlic garlic)
{
// TODO: remove memory copying
CachedGarlic = garlic;
AllocateBuffer(garlic.Data.Length);
Payload.Poke(garlic.Data, 0);
}
public GarlicCreationInfo(
I2PIdentHash dest,
GarlicCloveDelivery[] cloves,
EGGarlic msg,
KeyUsed key,
int tags,
uint trackingid,
uint?ackmsgid,
uint egackmsgid)
{
Destination = dest;
Cloves = cloves;
Garlic = msg;
TrackingId = trackingid;
KeyType = key;
AesTagsAvailable = tags;
EGAckMessageId = egackmsgid;
AckMessageId = ackmsgid;
}
public Garlic DecryptMessage(EGGarlic message)
{
lock ( SessionTags )
{
var old = SessionTags.Where(p => p.Key.Created.DeltaToNow.ToMinutes > (I2PSessionTag.TagLifetimeMinutes + 2)).ToArray();
foreach (var one in old)
{
SessionTags.Remove(one.Key);
}
}
var egdata = message.EGData;
var tag = new I2PSessionTag(new BufRefLen(egdata, 0, 32));
I2PSessionKey sessionkey;
bool found;
lock ( SessionTags )
{
found = SessionTags.TryGetValue(tag, out sessionkey);
}
BufLen aesbuf;
if (found)
{
aesbuf = new BufLen(egdata, 32);
lock ( SessionTags )
{
SessionTags.Remove(tag);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Working tag found for EGarlic.");
#endif
var pivh = I2PHashSHA256.GetHash(tag.Value);
Cipher.Init(false, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
Cipher.ProcessBytes(aesbuf);
}
else
{
BufLen egheader;
try
{
var egbuf = new BufLen(egdata, 0, 514);
egheader = ElGamalCrypto.Decrypt(egbuf, Key, true);
}
catch (Exception ex)
{
DebugUtils.Log("ReceivedSessions", ex);
return(null);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Using ElGamal to decrypt.");
#endif
sessionkey = new I2PSessionKey(new BufLen(egheader, 0, 32));
var preiv = new BufLen(egheader, 32, 32);
var egpadding = new BufLen(egheader, 64);
aesbuf = new BufLen(egdata, 514);
var pivh = I2PHashSHA256.GetHash(preiv);
Cipher.Init(false, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
Cipher.ProcessBytes(aesbuf);
}
GarlicAESBlock aesblock;
try
{
aesblock = new GarlicAESBlock(new BufRefLen(aesbuf));
}
catch (Exception ex)
{
DebugUtils.Log("ReceivedSessions", ex);
return(null);
}
if (!aesblock.VerifyPayloadHash())
{
DebugUtils.LogDebug("ReceivedSessions: DecryptMessage: AES block SHA256 check failed.");
return(null);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Working Aes block received. " + SessionTags.Count.ToString() + " tags available.");
#endif
if (aesblock.Tags.Count > 0)
{
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: " + aesblock.Tags.Count.ToString() + " new tags received.");
#endif
lock ( SessionTags )
{
foreach (var onetag in aesblock.Tags.ToArray())
{
SessionTags[new I2PSessionTag(new BufRef(onetag))] = sessionkey;
}
}
}
return(new Garlic((BufRefLen)aesblock.Payload));
}
void UpdateCachedFields(BufRef reader)
{
CachedGarlic = new EGGarlic(reader);
}
