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manual merge pull request #83, ALT_ECC_SIZE fix

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toddouska
2015-08-27 10:18:00 -07:00
parent e8c17ed2bb
commit 3c614b5ba7
1 changed files with 8 additions and 2 deletions
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10
wolfcrypt/src/tfm.c
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@@ -1057,7 +1057,8 @@ static int _fp_exptmod(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
} }
/* init M array */ /* init M array */
XMEMSET(M, 0, sizeof(M)); for(x = 0; x < (int)(sizeof(M)/sizeof(fp_int)); x++)
fp_init(&M[x]);
/* now setup montgomery */ /* now setup montgomery */
if ((err = fp_montgomery_setup (P, &mp)) != FP_OKAY) { if ((err = fp_montgomery_setup (P, &mp)) != FP_OKAY) {
@@ -1456,6 +1457,10 @@ int fp_cmp(fp_int *a, fp_int *b)
/* compare against a single digit */ /* compare against a single digit */
int fp_cmp_d(fp_int *a, fp_digit b) int fp_cmp_d(fp_int *a, fp_digit b)
{ {
/* special case for zero*/
if (a->used == 0 && b == 0)
return FP_EQ;
/* compare based on sign */ /* compare based on sign */
if ((b && a->used == 0) || a->sign == FP_NEG) { if ((b && a->used == 0) || a->sign == FP_NEG) {
return FP_LT; return FP_LT;
@@ -2156,9 +2161,10 @@ int mp_div_2d(fp_int* a, int b, fp_int* c, fp_int* d)
#ifdef ALT_ECC_SIZE #ifdef ALT_ECC_SIZE
void fp_copy(fp_int *a, fp_int* b) void fp_copy(fp_int *a, fp_int* b)
{ {
if (a != b) { if (a != b && b->size >= a->used) {
b->used = a->used; b->used = a->used;
b->sign = a->sign; b->sign = a->sign;
XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit)); XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
} }
} }