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author | Steffen Jaeckel <s_jaeckel@gmx.de> | 2019-09-16 15:50:38 +0200 |
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committer | Steffen Jaeckel <s_jaeckel@gmx.de> | 2019-09-16 15:50:38 +0200 |
commit | 577b7c01fef2c4dd6ec499398e64aa2adeda7e8f (patch) | |
tree | 8d6f745fddd3a9c170f7c98603518f77b515da4f /libtommath/bn_mp_mul_2.c | |
parent | 663fc015dbb5b39ac6be6630a003f0530af734fb (diff) | |
download | dropbear-577b7c01fef2c4dd6ec499398e64aa2adeda7e8f.tar.gz |
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
* make key-generation compliant to FIPS 186.4
* fix includes in tommath_class.h
* update fuzzcorpus instead of error-out
* fixup fuzzing make-targets
* update Makefile.in
* apply necessary patches to ltm sources
* clean-up not required ltm files
* update to vanilla ltm 1.1.0
this already only contains the required files
* remove set/get double
Diffstat (limited to 'libtommath/bn_mp_mul_2.c')
-rw-r--r-- | libtommath/bn_mp_mul_2.c | 113 |
1 files changed, 55 insertions, 58 deletions
diff --git a/libtommath/bn_mp_mul_2.c b/libtommath/bn_mp_mul_2.c index d22fd89..927ae99 100644 --- a/libtommath/bn_mp_mul_2.c +++ b/libtommath/bn_mp_mul_2.c @@ -1,4 +1,4 @@ -#include <tommath_private.h> +#include "tommath_private.h" #ifdef BN_MP_MUL_2_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * @@ -9,74 +9,71 @@ * Michael Fromberger but has been written from scratch with * additional optimizations in place. * - * The library is free for all purposes without any express - * guarantee it works. - * - * Tom St Denis, tstdenis82@gmail.com, http://libtom.org + * SPDX-License-Identifier: Unlicense */ /* b = a*2 */ -int mp_mul_2(mp_int * a, mp_int * b) +int mp_mul_2(const mp_int *a, mp_int *b) { - int x, res, oldused; + int x, res, oldused; - /* grow to accomodate result */ - if (b->alloc < (a->used + 1)) { - if ((res = mp_grow (b, a->used + 1)) != MP_OKAY) { - return res; - } - } + /* grow to accomodate result */ + if (b->alloc < (a->used + 1)) { + if ((res = mp_grow(b, a->used + 1)) != MP_OKAY) { + return res; + } + } - oldused = b->used; - b->used = a->used; + oldused = b->used; + b->used = a->used; - { - mp_digit r, rr, *tmpa, *tmpb; + { + mp_digit r, rr, *tmpa, *tmpb; - /* alias for source */ - tmpa = a->dp; - - /* alias for dest */ - tmpb = b->dp; + /* alias for source */ + tmpa = a->dp; - /* carry */ - r = 0; - for (x = 0; x < a->used; x++) { - - /* get what will be the *next* carry bit from the - * MSB of the current digit - */ - rr = *tmpa >> ((mp_digit)(DIGIT_BIT - 1)); - - /* now shift up this digit, add in the carry [from the previous] */ - *tmpb++ = ((*tmpa++ << ((mp_digit)1)) | r) & MP_MASK; - - /* copy the carry that would be from the source - * digit into the next iteration - */ - r = rr; - } + /* alias for dest */ + tmpb = b->dp; + + /* carry */ + r = 0; + for (x = 0; x < a->used; x++) { - /* new leading digit? */ - if (r != 0) { - /* add a MSB which is always 1 at this point */ - *tmpb = 1; - ++(b->used); - } + /* get what will be the *next* carry bit from the + * MSB of the current digit + */ + rr = *tmpa >> (mp_digit)(DIGIT_BIT - 1); - /* now zero any excess digits on the destination - * that we didn't write to - */ - tmpb = b->dp + b->used; - for (x = b->used; x < oldused; x++) { - *tmpb++ = 0; - } - } - b->sign = a->sign; - return MP_OKAY; + /* now shift up this digit, add in the carry [from the previous] */ + *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK; + + /* copy the carry that would be from the source + * digit into the next iteration + */ + r = rr; + } + + /* new leading digit? */ + if (r != 0u) { + /* add a MSB which is always 1 at this point */ + *tmpb = 1; + ++(b->used); + } + + /* now zero any excess digits on the destination + * that we didn't write to + */ + tmpb = b->dp + b->used; + for (x = b->used; x < oldused; x++) { + *tmpb++ = 0; + } + } + b->sign = a->sign; + return MP_OKAY; } #endif -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */ +/* ref: HEAD -> master, tag: v1.1.0 */ +/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ +/* commit time: 2019-01-28 20:32:32 +0100 */ |