Coverage Report

Created: 2023-09-25 06:08

/src/dropbear/libtommath/bn_mp_copy.c
Line
Count
Source (jump to first uncovered line)
1
#include "tommath_private.h"
2
#ifdef BN_MP_COPY_C
3
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
4
/* SPDX-License-Identifier: Unlicense */
5
6
/* copy, b = a */
7
mp_err mp_copy(const mp_int *a, mp_int *b)
8
12.4M
{
9
12.4M
   int n;
10
12.4M
   mp_digit *tmpa, *tmpb;
11
12.4M
   mp_err err;
12
13
   /* if dst == src do nothing */
14
12.4M
   if (a == b) {
15
5.73M
      return MP_OKAY;
16
5.73M
   }
17
18
   /* grow dest */
19
6.70M
   if (b->alloc < a->used) {
20
5.79k
      if ((err = mp_grow(b, a->used)) != MP_OKAY) {
21
0
         return err;
22
0
      }
23
5.79k
   }
24
25
   /* zero b and copy the parameters over */
26
   /* pointer aliases */
27
28
   /* source */
29
6.70M
   tmpa = a->dp;
30
31
   /* destination */
32
6.70M
   tmpb = b->dp;
33
34
   /* copy all the digits */
35
144M
   for (n = 0; n < a->used; n++) {
36
138M
      *tmpb++ = *tmpa++;
37
138M
   }
38
39
   /* clear high digits */
40
6.70M
   MP_ZERO_DIGITS(tmpb, b->used - n);
41
42
   /* copy used count and sign */
43
6.70M
   b->used = a->used;
44
6.70M
   b->sign = a->sign;
45
6.70M
   return MP_OKAY;
46
6.70M
}
47
#endif