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allow different sized fast math for both RSA and ECC

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add C_EXTRA_FLAGS "-DALT_ECC_SIZE" to enable, and set
size with "-DFP_MAX_BITS_ECC=512", default is 512
This commit is contained in:
John Safranek
2015-01-15 14:54:29 -08:00
parent 1bd80b20d6
commit 2e6d118a50
7 changed files with 410 additions and 255 deletions
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40
wolfcrypt/src/tfm.c
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@@ -417,7 +417,7 @@ void fp_mul_comba(fp_int *A, fp_int *B, fp_int *C)
}
if (A == C || B == C) {
fp_zero(&tmp);
fp_init(&tmp);
dst = &tmp;
} else {
fp_zero(C);
@@ -685,7 +685,7 @@ int fp_mod(fp_int *a, fp_int *b, fp_int *c)
fp_int t;
int err;
fp_zero(&t);
fp_init(&t);
if ((err = fp_div(a, b, NULL, &t)) != FP_OKAY) {
return err;
}
@@ -922,7 +922,7 @@ top:
int fp_mulmod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
{
fp_int tmp;
fp_zero(&tmp);
fp_init(&tmp);
fp_mul(a, b, &tmp);
return fp_mod(&tmp, c, d);
}
@@ -1339,7 +1339,7 @@ void fp_sqr_comba(fp_int *A, fp_int *B)
COMBA_CLEAR;
if (A == B) {
fp_zero(&tmp);
fp_init(&tmp);
dst = &tmp;
} else {
fp_zero(B);
@@ -1844,6 +1844,22 @@ int mp_init (mp_int * a)
return MP_OKAY;
}
#ifdef ALT_ECC_SIZE
void fp_init(fp_int *a)
{
a->size = FP_SIZE;
fp_zero(a);
}
void fp_zero(fp_int *a)
{
a->used = 0;
a->sign = FP_ZPOS;
XMEMSET(a->dp, 0, a->size * sizeof(fp_digit));
}
#endif
/* clear one (frees) */
void mp_clear (mp_int * a)
{
@@ -1958,6 +1974,17 @@ int mp_sub_d(fp_int *a, fp_digit b, fp_int *c)
}
#ifdef ALT_ECC_SIZE
void fp_copy(fp_int *a, fp_int* b)
{
if (a != b) {
b->used = a->used;
b->sign = a->sign;
XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
}
}
#endif
/* fast math conversion */
int mp_copy(fp_int* a, fp_int* b)
{
@@ -2014,7 +2041,7 @@ int mp_set_int(fp_int *a, fp_digit b)
int fp_sqrmod(fp_int *a, fp_int *b, fp_int *c)
{
fp_int tmp;
fp_zero(&tmp);
fp_init(&tmp);
fp_sqr(a, &tmp);
return fp_mod(&tmp, b, c);
}
@@ -2376,7 +2403,7 @@ void fp_gcd(fp_int *a, fp_int *b, fp_int *c)
fp_init_copy(&v, a);
}
fp_zero(&r);
fp_init(&r);
while (fp_iszero(&v) == FP_NO) {
fp_mod(&u, &v, &r);
fp_copy(&v, &u);
@@ -2393,6 +2420,7 @@ void fp_gcd(fp_int *a, fp_int *b, fp_int *c)
void fp_add_d(fp_int *a, fp_digit b, fp_int *c)
{
fp_int tmp;
fp_init(&tmp);
fp_set(&tmp, b);
fp_add(a,&tmp,c);
}