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don't require uneeded temp with WC_NO_CACHE_RESISTANT

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toddouska
2016-09-13 17:01:50 -07:00
parent 7b3fc558ec
commit b6937626b4
1 changed files with 7 additions and 1 deletions
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8
wolfcrypt/src/tfm.c
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@ -1061,7 +1061,11 @@ const wolfssl_word wc_off_on_addr[2] =
*/ */
static int _fp_exptmod(fp_int * G, fp_int * X, fp_int * P, fp_int * Y) static int _fp_exptmod(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
{ {
fp_int R[3]; #ifdef WC_NO_CACHE_RESISTANT
fp_int R[2];
#else
fp_int R[3]; /* need a temp for cache resistance */
#endif
fp_digit buf, mp; fp_digit buf, mp;
int err, bitcnt, digidx, y; int err, bitcnt, digidx, y;
@ -1072,7 +1076,9 @@ static int _fp_exptmod(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
fp_init(&R[0]); fp_init(&R[0]);
fp_init(&R[1]); fp_init(&R[1]);
#ifndef WC_NO_CACHE_RESISTANT
fp_init(&R[2]); fp_init(&R[2]);
#endif
/* now we need R mod m */ /* now we need R mod m */
fp_montgomery_calc_normalization (&R[0], P); fp_montgomery_calc_normalization (&R[0], P);