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Author SHA1 Message Date
akwizgran
0a84a01235 Allow identical batches to be sent to multiple contacts. 2011-09-07 11:15:34 +01:00
akwizgran
e80ede4429 Map keys must be unique. 2011-09-07 11:04:03 +01:00
akwizgran
478a22c8db Removed javadocs from prototype repo (push them to the website instead). 2011-09-01 11:13:06 +01:00
akwizgran
472dff3d61 Removed redundant frame number from header. 2011-09-01 11:11:31 +01:00
akwizgran
928ae6288f Javadocs. 2011-08-31 17:44:42 +01:00
akwizgran
3b32aee6be Slightly modified ConnectionWriterImpl to write a full-size frame as 
soon as possible, rather than waiting for the next write.
 2011-08-19 20:10:14 +02:00
akwizgran
0132c1eff4 Fixed a typo. 2011-08-19 19:58:40 +02:00
akwizgran
7e4ff343ea Added PaddedConnectionWriterTest to the ant buildfile. 2011-08-19 19:48:48 +02:00
akwizgran
d11f7ef824 Unit tests for PaddedConnectionWriter. Also broke some shared test 
code out into separate classes.
 2011-08-19 19:47:24 +02:00
akwizgran
4e2a74858b Writer and scheduler for fixed-rate connections (untested). 2011-08-19 17:27:29 +02:00
akwizgran
3084a6b058 Added optional padding to the frame format, so transports that are 
vulnerable to traffic analysis can frame their data independently of
packet boundaries.
 2011-08-19 14:47:16 +02:00
akwizgran
7a53ea7814 Unit tests for ConnectionWriterImpl. 2011-08-19 11:50:47 +02:00
akwizgran
156bafb8a6 Unit tests for ConnectionReaderImpl. 2011-08-19 11:40:30 +02:00
akwizgran
a59ad23e77 Removed unused code. 2011-08-19 11:21:59 +02:00
akwizgran
9dea4d0299 The word "tag" was overloaded, so from now on use "tag" for the 
predefined tags in the protocol and serial components, and "IV" for
the encrypted IVs used to identify connections in the transport
component.
 2011-08-19 11:15:35 +02:00
akwizgran
2411e2008b Frame the encrypted data independently of inter-packet boundaries and 
authenticate each frame before parsing its contents. Each connection
starts with a tag, followed by any number of frames, each starting
with the frame number (32 bits) and payload length (16 bits), and
ending with a MAC (256 bits).

Tags have the following format: 32 bits reserved, 16 bits for the
transport ID, 32 bits for the connection number, 32 bits (set to zero
in the tag) for the frame number, and 16 bits (set to zero in the tag)
for the block number. The tag is encrypted with the tag key in
ECB mode.

Frame numbers for each connection must start from zero and must be
contiguous and strictly increasing. Each frame is encrypted with the
frame key in CTR mode, using the plaintext tag with the appropriate
frame number to initialise the counter.

The maximum frame size is 64 KiB, including header and footer. The
maximum amount of data that can be sent over a connection is 2^32
frames - roughly 2^48 bytes, or 8 terabytes, with the maximum frame
size of 64 KiB. If that isn't sufficient we can add another 16 bits to
the frame counter.
 2011-08-19 01:46:51 +02:00
akwizgran
4dd303d9e1 Changed maximum packet and message sizes in preparation for new 
transport format.
 2011-08-18 15:14:48 +02:00
akwizgran
5e0aadd373 Moved the subscription and transport timestamps out of the contacts 
table so it's not necessary to hold a write lock on the (heavily used)
contacts table to update them.
 2011-08-14 14:46:12 +02:00
akwizgran
2c13e35dc4 Calculate the timestamp outside the subscription/transport update 
writer - this will allow it to be saved so new connections can work
out whether they should send updates.
 2011-08-14 13:36:21 +02:00
akwizgran
4497774311 Derive separate keys for each direction. 2011-08-14 12:18:16 +02:00
akwizgran
254da2da27 Removed the restriction that transport updates have to be written in 
delimited form.
 2011-08-14 11:41:56 +02:00
akwizgran
c2b0f0ab5a Each request packet should contain the unique ID of the offer to which 
it responds.
 2011-08-13 17:46:19 +02:00
akwizgran
e1b9ee247c Integration test for the protocol component. 2011-08-13 16:56:00 +02:00
akwizgran
8853c54930 Made the lock fairness test more precise. 2011-08-13 16:25:45 +02:00
akwizgran
36fc34993d Lock fairness test: check that fair ReentrantReadWriteLocks don't 
allow writers to starve. If this test passes on Java 5 and 6, we can
get rid of SynchronizedDatabaseComponent and merge
ReadWriteLockDatabaseComponent with DatabaseComponentImpl.
 2011-08-13 15:39:09 +02:00
akwizgran
9d25a819d1 Decoupled ProtocolReader (which belongs in the protocol component) 
from PacketReader (which belongs in the transport component).
 2011-08-13 14:18:16 +02:00
akwizgran
5b6fecfb43 Updated FileReadWriteTest to use the transport component for 
encrypting and decrypting packets. Moved the test to the main package
since it's an integration test for several components.
 2011-08-12 23:24:24 +02:00
akwizgran
a8994a3354 Don't forget to check the MAC. 2011-08-12 22:11:56 +02:00
akwizgran
0504a2d6fd Implemented PacketReader, renamed Packet{Reader,Writer}Factory in the 
protocol component to Protocol{Reader,Writer}Factory.
 2011-08-12 21:55:22 +02:00
akwizgran
4dcf9a70a1 Encrypt without allocating new buffers. 2011-08-12 17:35:45 +02:00
akwizgran
2c387f80b1 Packet decrypter with unit tests. Decryption is complicated by the 
fact that the cipher wants to operate a block at a time even though
it's in CTR mode.
 2011-08-12 17:14:58 +02:00
akwizgran
68b4760dfa Use a constant for the tag size. 2011-08-12 14:26:56 +02:00
akwizgran
f0cf825ca9 Javadoc and unit test for SharedSecret. 2011-08-12 12:57:23 +02:00
akwizgran
e896b2d86d Unit tests for ConnectionRecogniserImpl. 2011-08-12 12:26:47 +02:00
akwizgran
a789f49a39 Separated tag encoding from PacketWriterImpl, since it's also needed 
by the code that recognises tags. Implemented ConnectionRecogniser
(untested).
 2011-08-11 19:55:22 +01:00
akwizgran
7545a1cc8f Moved Bytes to the main package. Added a SharedSecret class to parse 
encrypted secrets retrieved from the database.
 2011-08-11 19:14:20 +01:00
akwizgran
df972e294d Support for decrypting shared secrets and deriving authentication and 
encryption keys from them (untested).
 2011-08-11 17:15:36 +01:00
akwizgran
3edfa5d1ba Call the listeners when contacts are added and removed. 2011-08-11 15:55:30 +01:00
akwizgran
151a360587 Store shared secrets in the database (the crypto component will be 
responsible for wrapping/unwrapping them).
 2011-08-11 15:41:52 +01:00
akwizgran
07b34cfbab Added a lock for the connectionWindows table and exposed 
getConnectionWindow() and setConnectionWindow() through the
DatabaseComponent interface.
 2011-08-11 15:19:32 +01:00
akwizgran
0e6638bad6 Retrieve the set of unseen connection numbers from a connection 
window.
 2011-08-11 13:58:11 +01:00
akwizgran
ac4521152f Unit tests for ConnectionWindowImpl. 2011-08-11 13:37:18 +01:00
akwizgran
e0b86f1232 Moved ConnectionWindow into the transport module and implemented 
window sliding (untested).
 2011-08-11 13:22:23 +01:00
akwizgran
d5d03192e3 Basic connection window persistence. 2011-08-11 12:56:21 +01:00
akwizgran
3e913118f2 PacketWriterFactory. 2011-08-09 18:23:27 +01:00
akwizgran
f3f0c223c4 PacketWriter is implemented by two classes: PacketWriterImpl and 
PacketEncrypter. The separation allows authentication and encryption
to be tested separately.
 2011-08-09 17:50:54 +01:00
akwizgran
e9d0021f56 Added interfaces for reading and writing packets and recognising which 
contact originated an incoming connection, and an implementation of
the PacketWriter interface.
 2011-08-09 16:15:25 +01:00
akwizgran
18654f1514 It's not necessary to acquire all locks before closing the database, 
since Database.close() prevents new transactions from starting anyway.
 2011-08-05 13:39:49 +01:00
akwizgran
c2045296eb Associate a timestamp with every subscription, indicating the earliest 
acceptable timestamp of subscribed messages. For a new subscription,
the timestamp is initialised to the current time, so a new subscriber
to a group will not immediately receive any messages. (Subscribing to
a group is therefore more like joining a mailing list than joining a
Usenet group - you only receive messages written after you joined.)

Once the database fills up and starts expiring messages, the
timestamps of subscriptions are updated so that contacts need not send
messages that would expire immediately. This is done using the
*approximate* timestamp of the oldest message in the database, to
avoid revealing the presence or absence of any particular message.
 2011-08-05 13:34:58 +01:00
akwizgran
6c5ce05c5d Promote integer types to the expected type to allow, for example, a 
list of mixed integer types to be read as a list of longs.
 2011-08-05 13:26:37 +01:00