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changes.txt
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changes.txt
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July 15th, 2003
v0.24 -- Optimized mp_add_d and mp_sub_d to not allocate temporary variables
-- Fixed mp_gcd() so the gcd of 0,0 is 0. Allows the gcd operation to be chained
e.g. (0,0,a) == a [instead of 1]
-- Should be one of the last release for a while. Working on LibTomMath book now.
-- optimized the pprime demo [/etc/pprime.c] to first make a huge table of single
digit primes then it reads them randomly instead of randomly choosing/testing single
digit primes.
July 12th, 2003
v0.23 -- Optimized mp_prime_next_prime() to not use mp_mod [via is_divisible()] in each
iteration. Instead now a smaller table is kept of the residues which can be updated
without division.
-- Fixed a bug in next_prime() where an input of zero would be treated as odd and
have two added to it [to move to the next odd].
-- fixed a bug in prime_fermat() and prime_miller_rabin() which allowed the base
to be negative, zero or one. Normally the test is only valid if the base is
greater than one.
-- changed the next_prime() prototype to accept a new parameter "bbs_style" which
will find the next prime congruent to 3 mod 4. The default [bbs_style==0] will
make primes which are either congruent to 1 or 3 mod 4.
-- fixed mp_read_unsigned_bin() so that it doesn't include both code for
the case DIGIT_BIT < 8 and >= 8
-- optimized div_d() to easy out on division by 1 [or if a == 0] and use
logical shifts if the divisor is a power of two.
-- the default DIGIT_BIT type was not int for non-default builds. Fixed.
July 2nd, 2003
v0.22 -- Fixed up mp_invmod so the result is properly in range now [was always congruent to the inverse...]
-- Fixed up s_mp_exptmod and mp_exptmod_fast so the lower half of the pre-computed table isn't allocated
which makes the algorithm use half as much ram.
-- Fixed the install script not to make the book :-) [which isn't included anyways]
-- added mp_cnt_lsb() which counts how many of the lsbs are zero
-- optimized mp_gcd() to use the new mp_cnt_lsb() to replace multiple divisions by two by a single division.
-- applied similar optimization to mp_prime_miller_rabin().
-- Fixed a bug in both mp_invmod() and fast_mp_invmod() which tested for odd
via "mp_iseven() == 0" which is not valid [since zero is not even either].
June 19th, 2003
v0.21 -- Fixed bug in mp_mul_d which would not handle sign correctly [would not always forward it]
-- Removed the #line lines from gen.pl [was in violation of ISO C]
June 8th, 2003
v0.20 -- Removed the book from the package. Added the TDCAL license document.
-- This release is officially pure-bred TDCAL again [last officially TDCAL based release was v0.16]
June 6th, 2003
v0.19 -- Fixed a bug in mp_montgomery_reduce() which was introduced when I tweaked mp_rshd() in the previous release.
Essentially the digits were not trimmed before the compare which cause a subtraction to occur all the time.
-- Fixed up etc/tune.c a bit to stop testing new cutoffs after 16 failures [to find more optimal points].
Brute force ho!
May 29th, 2003
v0.18 -- Fixed a bug in s_mp_sqr which would handle carries properly just not very elegantly.
(e.g. correct result, just bad looking code)
-- Fixed bug in mp_sqr which still had a 512 constant instead of MP_WARRAY
-- Added Toom-Cook multipliers [needs tuning!]
-- Added efficient divide by 3 algorithm mp_div_3
-- Re-wrote mp_div_d to be faster than calling mp_div
-- Added in a donated BCC makefile and a single page LTM poster (ahalhabsi@sbcglobal.net)
-- Added mp_reduce_2k which reduces an input modulo n = 2**p - k for any single digit k
-- Made the exptmod system be aware of the 2k reduction algorithms.
-- Rewrote mp_dr_reduce to be smaller, simpler and easier to understand.
May 17th, 2003
v0.17 -- Benjamin Goldberg submitted optimized mp_add and mp_sub routines. A new gen.pl as well
as several smaller suggestions. Thanks!
-- removed call to mp_cmp in inner loop of mp_div and put mp_cmp_mag in its place :-)
-- Fixed bug in mp_exptmod that would cause it to fail for odd moduli when DIGIT_BIT != 28
-- mp_exptmod now also returns errors if the modulus is negative and will handle negative exponents
-- mp_prime_is_prime will now return true if the input is one of the primes in the prime table
-- Damian M Gryski (dgryski@uwaterloo.ca) found a index out of bounds error in the
mp_fast_s_mp_mul_high_digs function which didn't come up before. (fixed)
-- Refactored the DR reduction code so there is only one function per file.
-- Fixed bug in the mp_mul() which would erroneously avoid the faster multiplier [comba] when it was
allowed. The bug would not cause the incorrect value to be produced just less efficient (fixed)
-- Fixed similar bug in the Montgomery reduction code.
-- Added tons of (mp_digit) casts so the 7/15/28/31 bit digit code will work flawlessly out of the box.
Also added limited support for 64-bit machines with a 60-bit digit. Both thanks to Tom Wu (tom@arcot.com)
-- Added new comments here and there, cleaned up some code [style stuff]
-- Fixed a lingering typo in mp_exptmod* that would set bitcnt to zero then one. Very silly stuff :-)
-- Fixed up mp_exptmod_fast so it would set "redux" to the comba Montgomery reduction if allowed. This
saves quite a few calls and if statements.
-- Added etc/mont.c a test of the Montgomery reduction [assuming all else works :-| ]
-- Fixed up etc/tune.c to use a wider test range [more appropriate] also added a x86 based addition which
uses RDTSC for high precision timing.
-- Updated demo/demo.c to remove MPI stuff [won't work anyways], made the tests run for 2 seconds each so its
not so insanely slow. Also made the output space delimited [and fixed up various errors]
-- Added logs directory, logs/graph.dem which will use gnuplot to make a series of PNG files
that go with the pre-made index.html. You have to build [via make timing] and run ltmtest first in the
root of the package.
-- Fixed a bug in mp_sub and mp_add where "-a - -a" or "-a + a" would produce -0 as the result [obviously invalid].
-- Fixed a bug in mp_rshd. If the count == a.used it should zero/return [instead of shifting]
-- Fixed a "off-by-one" bug in mp_mul2d. The initial size check on alloc would be off by one if the residue
shifting caused a carry.
-- Fixed a bug where s_mp_mul_digs() would not call the Comba based routine if allowed. This made Barrett reduction
slower than it had to be.
Mar 29th, 2003
v0.16 -- Sped up mp_div by making normalization one shift call
-- Sped up mp_mul_2d/mp_div_2d by aliasing pointers :-)
-- Cleaned up mp_gcd to use the macros for odd/even detection
-- Added comments here and there, mostly there but occasionally here too.
Mar 22nd, 2003
v0.15 -- Added series of prime testing routines to lib
-- Fixed up etc/tune.c
-- Added DR reduction algorithm
-- Beefed up the manual more.
-- Fixed up demo/demo.c so it doesn't have so many warnings and it does the full series of
tests
-- Added "pre-gen" directory which will hold a "gen.pl"'ed copy of the entire lib [done at
zipup time so its always the latest]
-- Added conditional casts for C++ users [boo!]
Mar 15th, 2003
v0.14 -- Tons of manual updates
-- cleaned up the directory
-- added MSVC makefiles
-- source changes [that I don't recall]
-- Fixed up the lshd/rshd code to use pointer aliasing
-- Fixed up the mul_2d and div_2d to not call rshd/lshd unless needed
-- Fixed up etc/tune.c a tad
-- fixed up demo/demo.c to output comma-delimited results of timing
also fixed up timing demo to use a finer granularity for various functions
-- fixed up demo/demo.c testing to pause during testing so my Duron won't catch on fire
[stays around 31-35C during testing :-)]
Feb 13th, 2003
v0.13 -- tons of minor speed-ups in low level add, sub, mul_2 and div_2 which propagate
to other functions like mp_invmod, mp_div, etc...
-- Sped up mp_exptmod_fast by using new code to find R mod m [e.g. B^n mod m]
-- minor fixes
Jan 17th, 2003
v0.12 -- re-wrote the majority of the makefile so its more portable and will
install via "make install" on most *nix platforms
-- Re-packaged all the source as seperate files. Means the library a single
file packagage any more. Instead of just adding "bn.c" you have to add
libtommath.a
-- Renamed "bn.h" to "tommath.h"
-- Changes to the manual to reflect all of this
-- Used GNU Indent to clean up the source
Jan 15th, 2003
v0.11 -- More subtle fixes
-- Moved to gentoo linux [hurrah!] so made *nix specific fixes to the make process
-- Sped up the montgomery reduction code quite a bit
-- fixed up demo so when building timing for the x86 it assumes ELF format now
Jan 9th, 2003
v0.10 -- Pekka Riikonen suggested fixes to the radix conversion code.
-- Added baseline montgomery and comba montgomery reductions, sped up exptmods
[to a point, see bn.h for MONTGOMERY_EXPT_CUTOFF]
Jan 6th, 2003
v0.09 -- Updated the manual to reflect recent changes. :-)
-- Added Jacobi function (mp_jacobi) to supplement the number theory side of the lib
-- Added a Mersenne prime finder demo in ./etc/mersenne.c
Jan 2nd, 2003
v0.08 -- Sped up the multipliers by moving the inner loop variables into a smaller scope
-- Corrected a bunch of small "warnings"
-- Added more comments
-- Made "mtest" be able to use /dev/random, /dev/urandom or stdin for RNG data
-- Corrected some bugs where error messages were potentially ignored
-- add etc/pprime.c program which makes numbers which are provably prime.
Jan 1st, 2003
v0.07 -- Removed alot of heap operations from core functions to speed them up
-- Added a root finding function [and mp_sqrt macro like from MPI]
-- Added more to manual
Dec 31st, 2002
v0.06 -- Sped up the s_mp_add, s_mp_sub which inturn sped up mp_invmod, mp_exptmod, etc...
-- Cleaned up the header a bit more
Dec 30th, 2002
v0.05 -- Builds with MSVC out of the box
-- Fixed a bug in mp_invmod w.r.t. even moduli
-- Made mp_toradix and mp_read_radix use char instead of unsigned char arrays
-- Fixed up exptmod to use fewer multiplications
-- Fixed up mp_init_size to use only one heap operation
-- Note there is a slight "off-by-one" bug in the library somewhere
without the padding (see the source for comment) the library
crashes in libtomcrypt. Anyways a reasonable workaround is to pad the
numbers which will always correct it since as the numbers grow the padding
will still be beyond the end of the number
-- Added more to the manual
Dec 29th, 2002
v0.04 -- Fixed a memory leak in mp_to_unsigned_bin
-- optimized invmod code
-- Fixed bug in mp_div
-- use exchange instead of copy for results
-- added a bit more to the manual
Dec 27th, 2002
v0.03 -- Sped up s_mp_mul_high_digs by not computing the carries of the lower digits
-- Fixed a bug where mp_set_int wouldn't zero the value first and set the used member.
-- fixed a bug in s_mp_mul_high_digs where the limit placed on the result digits was not calculated properly
-- fixed bugs in add/sub/mul/sqr_mod functions where if the modulus and dest were the same it wouldn't work
-- fixed a bug in mp_mod and mp_mod_d concerning negative inputs
-- mp_mul_d didn't preserve sign
-- Many many many many fixes
-- Works in LibTomCrypt now :-)
-- Added iterations to the timing demos... more accurate.
-- Tom needs a job.
Dec 26th, 2002
v0.02 -- Fixed a few "slips" in the manual. This is "LibTomMath" afterall :-)
-- Added mp_cmp_mag, mp_neg, mp_abs and mp_radix_size that were missing.
-- Sped up the fast [comba] multipliers more [yahoo!]
Dec 25th,2002
v0.01 -- Initial release. Gimme a break.
-- Todo list,
add details to manual [e.g. algorithms]
more comments in code
example programs