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comparison libtommath/bn_mp_read_signed_bin.c @ 1655:f52919ffd3b1

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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>
date Mon, 16 Sep 2019 15:50:38 +0200
parents 8bba51a55704
children
comparison
equal deleted inserted replaced
1654:cc0fc5131c5c 1655:f52919ffd3b1
1 #include <tommath_private.h> 1 #include "tommath_private.h"
2 #ifdef BN_MP_READ_SIGNED_BIN_C 2 #ifdef BN_MP_READ_SIGNED_BIN_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 /* read signed bin, big endian, first byte is 0==positive or 1==negative */ 15 /* read signed bin, big endian, first byte is 0==positive or 1==negative */
19 int mp_read_signed_bin (mp_int * a, const unsigned char *b, int c) 16 int mp_read_signed_bin(mp_int *a, const unsigned char *b, int c)
20 { 17 {
21 int res; 18 int res;
22 19
23 /* read magnitude */ 20 /* read magnitude */
24 if ((res = mp_read_unsigned_bin (a, b + 1, c - 1)) != MP_OKAY) { 21 if ((res = mp_read_unsigned_bin(a, b + 1, c - 1)) != MP_OKAY) {
25 return res; 22 return res;
26 } 23 }
27 24
28 /* first byte is 0 for positive, non-zero for negative */ 25 /* first byte is 0 for positive, non-zero for negative */
29 if (b[0] == 0) { 26 if (b[0] == (unsigned char)0) {
30 a->sign = MP_ZPOS; 27 a->sign = MP_ZPOS;
31 } else { 28 } else {
32 a->sign = MP_NEG; 29 a->sign = MP_NEG;
33 } 30 }
34 31
35 return MP_OKAY; 32 return MP_OKAY;
36 } 33 }
37 #endif 34 #endif
38 35
39 /* ref: $Format:%D$ */ 36 /* ref: HEAD -> master, tag: v1.1.0 */
40 /* git commit: $Format:%H$ */ 37 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
41 /* commit time: $Format:%ai$ */ 38 /* commit time: 2019-01-28 20:32:32 +0100 */