ed448goldilocks/HISTORY.txt

March 29, 2014:
    Added a test directory with various tests.  Currently testing SHA512 Monte
    Carlo, compatibility of the different scalarmul functions, and some
    identities on EC point ops.  Began moving these tests out of benchmarker.
    
    Added scan-build support.
    
    Improved some internal interfaces.  Made a structure for Barrett primes
    instead of passing parameters individually.  Moved some field operations
    to places that make more sense, eg Barrett serialize and deserialize.  The
    deserialize operation now checks that its argument is in [0,q).
    
    Added more documentation.
    
    Changed the names of a bunch of functions.  Still not entirely consistent,
    but getting more so.
    
    Some minor speed improvements.  For example, multiply is now a couple cycles
    faster.
    
    Added a hackish attempt at thread-safety and initialization sanity checking
    in the Goldilocks top-level routines.
    
    Fixed some vector alignment bugs.  Compiling with -O0 should now work.
    
    Slightly simplified recode_wnaf.

    Add a config.h file for future configuration.  EXPERIMENT flags moved here.
    
    I've decided against major changes to SHA512 for the moment.  They add speed
    but also significantly bloat the code, which is going to hurt L1 cache
    performance.  Perhaps we should link to OpenSSL if a faster SHA512 is desired.
    
    Reorganize the source tree into src, test; factor arch stuff into src/arch_*.
    
    Make most of the code 32-bit clean.  There's now a 32-bit generic and 32-bit
    vectorless ARM version.  No NEON version yet because I don't have a test
    machine (could use my phone in a pinch I guess?).  The 32-bit version still
    isn't heavily optimized, but on ARM it's using a nicely reworked signed/phi-adic
    multiplier.  The squaring is also based on this, but could really stand some
    improvement.
    
    When passed an even exponent (or extra doubles), the Montgomery ladder should
    now be accept points if and only if they lie on the curve.  This needs
    additional testing, but it passes the zero bit exponent test.
    
    On 32-bit, use 8x4x14 instead of 5x5x18 table organization.  Probably there's
    a better heuristic.

March 5, 2014:
    First revision.
    
    Private keys are now longer.  They now store a copy of the public key, and
    a secret symmetric key for signing purposes.
    
    Signatures are now supported, though like everything else in this library,
    their format is not stable.  They use a deterministic Schnorr mode,
    similar to EdDSA.  Precomputed low-latency signing is not supported (yet?).
    The hash function is SHA-512.
    
    The deterministic hashing mode needs to be changed to HMAC (TODO!).  It's
    currently envelope-MAC.
    
    Probably in the future there will be a distinction between ECDH key and
    signing keys (and possibly also MQV keys etc).
    
    Began renaming internal functions.  Removing p448_ prefixes from EC point
    operations.  Trying to put the verb first.  For example,
    "p448_isogeny_un_to_tw" is now called "twist_and_double".
    
    Began documenting with Doxygen.  Use "make doc" to make a very incomplete
    documentation directory.
    
    There have been many other internal changes.

Feb 21, 2014:
    Initial import and benchmarking scripts.
    
    Keygen and ECDH are implemented, but there's no hash function.