Start on an 0.3.0.1-alpha changelog

changes/bug20593.2

-  o Minor features (diagnostic, directory client):
-    - Warn if we find an unexpected inconsistency in directory download
-      status objects. Prevents some negative consequences of bug 20593.
-

changes/bug20622

-  o Minor bugfixes (configuration):
-    - Support "TByte" and "TBytes" units in options given in bytes.
-      "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
-      supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
-
-  o Minor bugfixes (documentation):
-    - Include the "TBits" unit in Tor's man page. Fixes part of bug
-      20622; bugfix on tor-0.2.5.1-alpha.

changes/bug20646

-  o Minor bugfix (util):
-    - When finishing writing a file to disk, if we were about to replace the
-      file with the temporary file created before and we fail to replace it,
-      remove the temporary file so it doesn't stay on disk. Fixes bug 20646;
-      bugfix on tor-0.2.0.7-alpha. Patch by fk.

changes/bug20667

-  o Minor bugfixes (directory downloads):
-    - Download all consensus flavors, descriptors, and authority certificates
-      when FetchUselessDescriptors is set, regardless of whether tor is a
-      directory cache or not.
-      Fixes bug 20667; bugfix on all recent tor versions.

changes/bug20839

-  o Minor bugfixes (descriptors):
-    - Correctly recognise downloaded full descriptors as valid, even when
-      using microdescriptors as circuits. This affects clients with
-      FetchUselessDescriptors set, and may affect directory authorities.
-      Fixes bug 20839; bugfix on commit 6083276 in 0.2.3.2-alpha.

changes/bug20860

-  o Minor bugfixes (hidden services):
-    - Stop ignoring duplicate hidden services when validating: this could
-      lead to a crash when those services were created.
-      Fixes bug 20860; bugfix on 20559; not in any released version of tor.

changes/bug6769

-  o Minor bugfixes (directory system):
-    - Bridges and relays now use microdescriptors (like clients do)
-      rather than old-style router descriptors. Now bridges will blend in
-      with clients in terms of the circuits they build. Fixes bug 6769;
-      bugfix on 0.2.3.2-alpha.

changes/feature13752

-  o Minor features (fingerprinting resistence, authentication):
-    - Extend the length of RSA keys used for TLS link authentication to
-      2048 bits. (These weren't used for forward secrecy; for forward
-      secrecy, we used P256.) Closes ticket 13752.

changes/feature15055

-  o Major features (protocol, Ed25519):
-    - Tor relays now use Ed25519 to prove their Ed25519 identities and
-      Ed25519 to one another, and to clients. This algorithm is faster
-      and more secure than the RSA-based handshake we've been doing until
-      now. Implements the second big part of proposal 220; Closes ticket
-      15055.

changes/feature15056

-  o Major features (ed25519 identity keys):
-    - Relays now understand requests to extend to other relays
-      by their Ed25519 identity keys. When an Ed25519 identity key
-      is included in an EXTEND2 cell, the relay will only extend
-      the circuit if the other relay can prove ownership of that identity.
-      Implements part of ticket 15056; part of proposal 220.
-    - Clients now support including Ed25519 identity keys in the EXTEND2
-      cells they generate.  By default, this is controlled by a consensus
-      parameter, currently disabled.  You can turn this feature on for
-      testing by setting ExtendByEd25519ID in your configuration. This might
-      make your traffic appear different than the traffic generated by other
-      users, however.
-      Implements part of ticket 15056; part of proposal 220.
-
-  o Code simplification and refactoring:
-    - The code to generate and parse EXTEND and EXTEND2 cells has
-      been replaced with code automatically generated by the "trunnel"
-      utility.
-    - Remove data structures that were used to index or_connection objects by
-      their RSA identity digests. These structures are fully redundant with
-      the similar structures used in the channel abstraction.
-
-  o Minor features (directory authority):
-    - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
-      default) to control whether authorities should try to probe relays by
-      their Ed25519 link keys.  This option will go away in a few
-      releases--unless we encounter major trouble in our ed25519 link
-      protocol rollout, in which case it will serve as a safety option.

changes/feature17238

-  o Major features (onion services):
-    - Tor relays now support the HSDir version 3 protocol meaning they can
-      store and serve v3 descriptors. This is part of the next generation
-      onion service work detailled in proposal 224. The tor daemon also
-      contains all the necessary code to encode and decode a v3 descriptor but
-      it's currently only used by the directory subsystem. Closes ticket 17238.

changes/feature20552

-  o Minor features (ed25519 link handshake):
-    - Advertise support for the ed25519 link handshake using the
-      subprotocol-versions mechanism, so that clients can tell which
-      relays can identity themselves by Ed25519 ID. Closes ticket 20552.

changes/ticket18873

-  o Code simplification and refactoring:
-    - Refactor circuit_predict_and_launch_new for readability and
-      testability. Closes ticket 18873.
-    - Extract magic numbers in circuituse.c into defined variables.
-    - Refactor circuit_is_available_for_use to remove unnecessary check.
-
-  o Minor features (unit tests):
-    - Extract dummy_origin_circuit_new so it can be used by other test
-      functions.
-    - Add unit tests circuit_predict_and_launch_new.

changes/ticket19858

-  o Code simplification and refactoring (guards):
-    - Abolish all global guard context in entrynodes.c; replace with new
-      guard_selection_t structure as preparation for proposal 271.  Closes
-      ticket 19858.

changes/ticket20077

-  o Code simplification and refactoring:
-    - Remove redundant behavior of is_sensitive_dir_purpose, refactor to use
-      only purpose_needs_anonymity.  Closes part of ticket 20077.
-    - Refactor large if statement in purpose_needs_anonymity to use switch
-      statement instead. Closes part of ticket 20077.

changes/ticket20486

-  o Documentation (Onion Services):
-     - tor's man page incorrectly states that HiddenServiceDir must already
-       exist. This is not true. Fixes 20486.

changes/ticket20717

-  o Code simplification and refactoring:
-    - Refactor the hashing API to return negative values for errors, as is done
-      as throughout the codebase. Closes ticket 20717.

changes/ticket20831

-  o Removed features:
-    - The UseDirectoryGuards torrc options is
-      no longer present: all users that use entry guards will also use
-      directory guards. Related to proposal 271; implements part of
-      ticket 20831.
-

changes/ticket20960

-  o Removed features:
-    - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
-      limit for relays running on a single IP applies to authority IP
-      addresses as well as to non-authority IP addresses.  Closes ticket
-      20960.

changes/ticket5500

-  o Testing:
-    - Perform the coding style checks when running the tests and fail when
-      coding style violations are found. Closes ticket 5500.