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Avoid temporary

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This commit is contained in:
Matt Johnston 2016-03-17 22:37:56 +08:00 committed by Steffen Jaeckel
parent c17c47715a
commit 27e6485995
1 changed files with 4 additions and 15 deletions
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19
bn_mp_div_2d.c
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@ -20,8 +20,6 @@ int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d)
{ {
mp_digit D, r, rr; mp_digit D, r, rr;
int x, res; int x, res;
mp_int t;
/* if the shift count is <= 0 then we do no work */ /* if the shift count is <= 0 then we do no work */
if (b <= 0) { if (b <= 0) {
@ -32,24 +30,19 @@ int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d)
return res; return res;
} }
if ((res = mp_init (&t)) != MP_OKAY) { /* copy */
if ((res = mp_copy (a, c)) != MP_OKAY) {
return res; return res;
} }
/* 'a' should not be used after here - it might be the same as d */
/* get the remainder */ /* get the remainder */
if (d != NULL) { if (d != NULL) {
if ((res = mp_mod_2d (a, b, &t)) != MP_OKAY) { if ((res = mp_mod_2d (a, b, d)) != MP_OKAY) {
mp_clear (&t);
return res; return res;
} }
} }
/* copy */
if ((res = mp_copy (a, c)) != MP_OKAY) {
mp_clear (&t);
return res;
}
/* shift by as many digits in the bit count */ /* shift by as many digits in the bit count */
if (b >= (int)DIGIT_BIT) { if (b >= (int)DIGIT_BIT) {
mp_rshd (c, b / DIGIT_BIT); mp_rshd (c, b / DIGIT_BIT);
@ -84,10 +77,6 @@ int mp_div_2d (mp_int * a, int b, mp_int * c, mp_int * d)
} }
} }
mp_clamp (c); mp_clamp (c);
if (d != NULL) {
mp_exch (&t, d);
}
mp_clear (&t);
return MP_OKAY; return MP_OKAY;
} }
#endif #endif