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comparison libtommath/bn_mp_fread.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 1051e4eea25a
comparison
equal deleted inserted replaced
1654:cc0fc5131c5c 1655:f52919ffd3b1
1 #include <tommath_private.h> 1 #include "tommath_private.h"
2 #ifdef BN_MP_FREAD_C 2 #ifdef BN_MP_FREAD_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 #ifndef LTM_NO_FILE 15 #ifndef LTM_NO_FILE
19 /* read a bigint from a file stream in ASCII */ 16 /* read a bigint from a file stream in ASCII */
20 int mp_fread(mp_int *a, int radix, FILE *stream) 17 int mp_fread(mp_int *a, int radix, FILE *stream)
21 { 18 {
22 int err, ch, neg, y; 19 int err, ch, neg, y;
23 20 unsigned pos;
21
24 /* clear a */ 22 /* clear a */
25 mp_zero(a); 23 mp_zero(a);
26 24
27 /* if first digit is - then set negative */ 25 /* if first digit is - then set negative */
28 ch = fgetc(stream); 26 ch = fgetc(stream);
29 if (ch == '-') { 27 if (ch == (int)'-') {
30 neg = MP_NEG; 28 neg = MP_NEG;
31 ch = fgetc(stream); 29 ch = fgetc(stream);
32 } else { 30 } else {
33 neg = MP_ZPOS; 31 neg = MP_ZPOS;
34 } 32 }
35 33
36 for (;;) { 34 for (;;) {
37 /* find y in the radix map */ 35 pos = (unsigned)(ch - (int)'(');
38 for (y = 0; y < radix; y++) { 36 if (mp_s_rmap_reverse_sz < pos) {
39 if (mp_s_rmap[y] == ch) {
40 break;
41 }
42 }
43 if (y == radix) {
44 break; 37 break;
45 } 38 }
46 39
40 y = (int)mp_s_rmap_reverse[pos];
41
42 if ((y == 0xff) || (y >= radix)) {
43 break;
44 }
45
47 /* shift up and add */ 46 /* shift up and add */
48 if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) { 47 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
49 return err; 48 return err;
50 } 49 }
51 if ((err = mp_add_d(a, y, a)) != MP_OKAY) { 50 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
52 return err; 51 return err;
53 } 52 }
54 53
55 ch = fgetc(stream); 54 ch = fgetc(stream);
56 } 55 }
57 if (mp_cmp_d(a, 0) != MP_EQ) { 56 if (mp_cmp_d(a, 0uL) != MP_EQ) {
58 a->sign = neg; 57 a->sign = neg;
59 } 58 }
60 59
61 return MP_OKAY; 60 return MP_OKAY;
62 } 61 }
63 #endif 62 #endif
64 63
65 #endif 64 #endif
66 65
67 /* ref: $Format:%D$ */ 66 /* ref: HEAD -> master, tag: v1.1.0 */
68 /* git commit: $Format:%H$ */ 67 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
69 /* commit time: $Format:%ai$ */ 68 /* commit time: 2019-01-28 20:32:32 +0100 */