Mercurial > dropbear
comparison libtommath/bn_mp_grow.c @ 1692:1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
* update C files
* update other files
* update headers
* update makefiles
* remove mp_set/get_double()
* use ltm 1.2.0 API
* update ltm_desc
* use bundled tommath if system-tommath is too old
* XMALLOC etc. were changed to MP_MALLOC etc.
author | Steffen Jaeckel <s@jaeckel.eu> |
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date | Tue, 26 May 2020 17:36:47 +0200 |
parents | f52919ffd3b1 |
children |
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1691:2d3745d58843 | 1692:1051e4eea25a |
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1 #include "tommath_private.h" | 1 #include "tommath_private.h" |
2 #ifdef BN_MP_GROW_C | 2 #ifdef BN_MP_GROW_C |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis | 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
4 * | 4 /* SPDX-License-Identifier: Unlicense */ |
5 * LibTomMath is a library that provides multiple-precision | |
6 * integer arithmetic as well as number theoretic functionality. | |
7 * | |
8 * The library was designed directly after the MPI library by | |
9 * Michael Fromberger but has been written from scratch with | |
10 * additional optimizations in place. | |
11 * | |
12 * SPDX-License-Identifier: Unlicense | |
13 */ | |
14 | 5 |
15 /* grow as required */ | 6 /* grow as required */ |
16 int mp_grow(mp_int *a, int size) | 7 mp_err mp_grow(mp_int *a, int size) |
17 { | 8 { |
18 int i; | 9 int i; |
19 mp_digit *tmp; | 10 mp_digit *tmp; |
20 | 11 |
21 /* if the alloc size is smaller alloc more ram */ | 12 /* if the alloc size is smaller alloc more ram */ |
22 if (a->alloc < size) { | 13 if (a->alloc < size) { |
23 /* ensure there are always at least MP_PREC digits extra on top */ | |
24 size += (MP_PREC * 2) - (size % MP_PREC); | |
25 | |
26 /* reallocate the array a->dp | 14 /* reallocate the array a->dp |
27 * | 15 * |
28 * We store the return in a temporary variable | 16 * We store the return in a temporary variable |
29 * in case the operation failed we don't want | 17 * in case the operation failed we don't want |
30 * to overwrite the dp member of a. | 18 * to overwrite the dp member of a. |
31 */ | 19 */ |
32 tmp = OPT_CAST(mp_digit) XREALLOC(a->dp, sizeof(mp_digit) * (size_t)size); | 20 tmp = (mp_digit *) MP_REALLOC(a->dp, |
21 (size_t)a->alloc * sizeof(mp_digit), | |
22 (size_t)size * sizeof(mp_digit)); | |
33 if (tmp == NULL) { | 23 if (tmp == NULL) { |
34 /* reallocation failed but "a" is still valid [can be freed] */ | 24 /* reallocation failed but "a" is still valid [can be freed] */ |
35 return MP_MEM; | 25 return MP_MEM; |
36 } | 26 } |
37 | 27 |
39 a->dp = tmp; | 29 a->dp = tmp; |
40 | 30 |
41 /* zero excess digits */ | 31 /* zero excess digits */ |
42 i = a->alloc; | 32 i = a->alloc; |
43 a->alloc = size; | 33 a->alloc = size; |
44 for (; i < a->alloc; i++) { | 34 MP_ZERO_DIGITS(a->dp + i, a->alloc - i); |
45 a->dp[i] = 0; | |
46 } | |
47 } | 35 } |
48 return MP_OKAY; | 36 return MP_OKAY; |
49 } | 37 } |
50 #endif | 38 #endif |
51 | |
52 /* ref: HEAD -> master, tag: v1.1.0 */ | |
53 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ | |
54 /* commit time: 2019-01-28 20:32:32 +0100 */ |