Mercurial > dropbear
comparison libtommath/bn_mp_set_int.c @ 1655:f52919ffd3b1
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
author | Steffen Jaeckel <s_jaeckel@gmx.de> |
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date | Mon, 16 Sep 2019 15:50:38 +0200 |
parents | 8bba51a55704 |
children |
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1654:cc0fc5131c5c | 1655:f52919ffd3b1 |
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1 #include <tommath_private.h> | 1 #include "tommath_private.h" |
2 #ifdef BN_MP_SET_INT_C | 2 #ifdef BN_MP_SET_INT_C |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis | 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
4 * | 4 * |
5 * LibTomMath is a library that provides multiple-precision | 5 * LibTomMath is a library that provides multiple-precision |
6 * integer arithmetic as well as number theoretic functionality. | 6 * integer arithmetic as well as number theoretic functionality. |
7 * | 7 * |
8 * The library was designed directly after the MPI library by | 8 * The library was designed directly after the MPI library by |
9 * Michael Fromberger but has been written from scratch with | 9 * Michael Fromberger but has been written from scratch with |
10 * additional optimizations in place. | 10 * additional optimizations in place. |
11 * | 11 * |
12 * The library is free for all purposes without any express | 12 * SPDX-License-Identifier: Unlicense |
13 * guarantee it works. | |
14 * | |
15 * Tom St Denis, [email protected], http://libtom.org | |
16 */ | 13 */ |
17 | 14 |
18 /* set a 32-bit const */ | 15 /* set a 32-bit const */ |
19 int mp_set_int (mp_int * a, unsigned long b) | 16 int mp_set_int(mp_int *a, unsigned long b) |
20 { | 17 { |
21 int x, res; | 18 int x, res; |
22 | 19 |
23 mp_zero (a); | 20 mp_zero(a); |
24 | |
25 /* set four bits at a time */ | |
26 for (x = 0; x < 8; x++) { | |
27 /* shift the number up four bits */ | |
28 if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) { | |
29 return res; | |
30 } | |
31 | 21 |
32 /* OR in the top four bits of the source */ | 22 /* set four bits at a time */ |
33 a->dp[0] |= (b >> 28) & 15; | 23 for (x = 0; x < 8; x++) { |
24 /* shift the number up four bits */ | |
25 if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) { | |
26 return res; | |
27 } | |
34 | 28 |
35 /* shift the source up to the next four bits */ | 29 /* OR in the top four bits of the source */ |
36 b <<= 4; | 30 a->dp[0] |= (mp_digit)(b >> 28) & 15uL; |
37 | 31 |
38 /* ensure that digits are not clamped off */ | 32 /* shift the source up to the next four bits */ |
39 a->used += 1; | 33 b <<= 4; |
40 } | 34 |
41 mp_clamp (a); | 35 /* ensure that digits are not clamped off */ |
42 return MP_OKAY; | 36 a->used += 1; |
37 } | |
38 mp_clamp(a); | |
39 return MP_OKAY; | |
43 } | 40 } |
44 #endif | 41 #endif |
45 | 42 |
46 /* ref: $Format:%D$ */ | 43 /* ref: HEAD -> master, tag: v1.1.0 */ |
47 /* git commit: $Format:%H$ */ | 44 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
48 /* commit time: $Format:%ai$ */ | 45 /* commit time: 2019-01-28 20:32:32 +0100 */ |