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libtommath: allow mp_shrink to shrink initialized, but empty MPI's

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from https://github.com/libtom/libtommath

Change-Id: I5814caeb44db710957152a7d47b03f9beb6e5147
This commit is contained in:
Steffen Jaeckel
2013-10-07 17:20:57 -05:00
committed by Jeffrey Altman
parent 28051fa99c
commit 5bc653f0ef
1 changed files with 8 additions and 3 deletions
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11
lib/hcrypto/libtommath/bn_mp_shrink.c
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@@ -19,12 +19,17 @@
int mp_shrink (mp_int * a) int mp_shrink (mp_int * a)
{ {
mp_digit *tmp; mp_digit *tmp;
if (a->alloc != a->used && a->used > 0) { int used = 1;
if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * a->used)) == NULL) {
if(a->used > 0)
used = a->used;
if (a->alloc != used) {
if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) {
return MP_MEM; return MP_MEM;
} }
a->dp = tmp; a->dp = tmp;
a->alloc = a->used; a->alloc = used;
} }
return MP_OKAY; return MP_OKAY;
} }