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ge448_double_scalarmult_vartime(): streamline WOLFSSL_SMALL_STACK refactor.

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This commit is contained in:
Daniel Pouzzner
2020-09-04 00:46:11 -05:00
parent 80961ea913
commit 43c12ede50
1 changed files with 27 additions and 32 deletions
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59
wolfcrypt/src/ge_448.c
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@ -10679,13 +10679,12 @@ int ge448_double_scalarmult_vartime(ge448_p2 *r, const uint8_t *a,
#else #else
int8_t *aslide = NULL; int8_t *aslide = NULL;
int8_t *bslide = NULL; int8_t *bslide = NULL;
ge448_p2 *pi[16]; /* p,3p,..,31p */ ge448_p2 *pi = NULL; /* p,3p,..,31p */
ge448_p2 *p2 = NULL; ge448_p2 *p2 = NULL;
int i, ret; int i, ret;
#define PI_PTR(pi) (pi) #define PI_PTR(pi) (pi)
XMEMSET(pi, 0, sizeof pi);
aslide = (int8_t *)XMALLOC(GE448_WINDOW_BUF_SIZE, NULL, DYNAMIC_TYPE_TMP_BUFFER); aslide = (int8_t *)XMALLOC(GE448_WINDOW_BUF_SIZE, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (! aslide) { if (! aslide) {
ret = MEMORY_E; ret = MEMORY_E;
@ -10696,12 +10695,10 @@ int ge448_double_scalarmult_vartime(ge448_p2 *r, const uint8_t *a,
ret = MEMORY_E; ret = MEMORY_E;
goto out; goto out;
} }
for (i = 0; i < (int)(sizeof pi / sizeof pi[0]); ++i) { pi = (ge448_p2 *)XMALLOC(16 * sizeof *pi, NULL, DYNAMIC_TYPE_TMP_BUFFER);
pi[i] = (ge448_p2 *)XMALLOC(sizeof *pi[i], NULL, DYNAMIC_TYPE_TMP_BUFFER); if (! pi) {
if (! pi[i]) { ret = MEMORY_E;
ret = MEMORY_E; goto out;
goto out;
}
} }
p2 = (ge448_p2 *)XMALLOC(sizeof *p2, NULL, DYNAMIC_TYPE_TMP_BUFFER); p2 = (ge448_p2 *)XMALLOC(sizeof *p2, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (! p2) { if (! p2) {
@ -10713,25 +10710,25 @@ int ge448_double_scalarmult_vartime(ge448_p2 *r, const uint8_t *a,
slide(aslide, a); slide(aslide, a);
slide(bslide, b); slide(bslide, b);
fe448_copy(PI_PTR(pi[0])->X, p->X); fe448_copy(pi[0].X, p->X);
fe448_copy(PI_PTR(pi[0])->Y, p->Y); fe448_copy(pi[0].Y, p->Y);
fe448_copy(PI_PTR(pi[0])->Z, p->Z); fe448_copy(pi[0].Z, p->Z);
ge448_dbl(PI_PTR(p2), p); ge448_dbl(PI_PTR(p2), p);
ge448_add(PI_PTR(pi[1]), PI_PTR(p2), PI_PTR(pi[0])); ge448_add(&pi[1], PI_PTR(p2), &pi[0]);
ge448_add(PI_PTR(pi[2]), PI_PTR(p2), PI_PTR(pi[1])); ge448_add(&pi[2], PI_PTR(p2), &pi[1]);
ge448_add(PI_PTR(pi[3]), PI_PTR(p2), PI_PTR(pi[2])); ge448_add(&pi[3], PI_PTR(p2), &pi[2]);
ge448_add(PI_PTR(pi[4]), PI_PTR(p2), PI_PTR(pi[3])); ge448_add(&pi[4], PI_PTR(p2), &pi[3]);
ge448_add(PI_PTR(pi[5]), PI_PTR(p2), PI_PTR(pi[4])); ge448_add(&pi[5], PI_PTR(p2), &pi[4]);
ge448_add(PI_PTR(pi[6]), PI_PTR(p2), PI_PTR(pi[5])); ge448_add(&pi[6], PI_PTR(p2), &pi[5]);
ge448_add(PI_PTR(pi[7]), PI_PTR(p2), PI_PTR(pi[6])); ge448_add(&pi[7], PI_PTR(p2), &pi[6]);
ge448_add(PI_PTR(pi[8]), PI_PTR(p2), PI_PTR(pi[7])); ge448_add(&pi[8], PI_PTR(p2), &pi[7]);
ge448_add(PI_PTR(pi[9]), PI_PTR(p2), PI_PTR(pi[8])); ge448_add(&pi[9], PI_PTR(p2), &pi[8]);
ge448_add(PI_PTR(pi[10]), PI_PTR(p2), PI_PTR(pi[9])); ge448_add(&pi[10], PI_PTR(p2), &pi[9]);
ge448_add(PI_PTR(pi[11]), PI_PTR(p2), PI_PTR(pi[10])); ge448_add(&pi[11], PI_PTR(p2), &pi[10]);
ge448_add(PI_PTR(pi[12]), PI_PTR(p2), PI_PTR(pi[11])); ge448_add(&pi[12], PI_PTR(p2), &pi[11]);
ge448_add(PI_PTR(pi[13]), PI_PTR(p2), PI_PTR(pi[12])); ge448_add(&pi[13], PI_PTR(p2), &pi[12]);
ge448_add(PI_PTR(pi[14]), PI_PTR(p2), PI_PTR(pi[13])); ge448_add(&pi[14], PI_PTR(p2), &pi[13]);
ge448_add(PI_PTR(pi[15]), PI_PTR(p2), PI_PTR(pi[14])); ge448_add(&pi[15], PI_PTR(p2), &pi[14]);
ge448_0(r); ge448_0(r);
@ -10746,9 +10743,9 @@ int ge448_double_scalarmult_vartime(ge448_p2 *r, const uint8_t *a,
ge448_dbl(r, r); ge448_dbl(r, r);
if (aslide[i] > 0) if (aslide[i] > 0)
ge448_add(r, r, PI_PTR(pi[aslide[i]/2])); ge448_add(r, r, &pi[aslide[i]/2]);
else if (aslide[i] < 0) else if (aslide[i] < 0)
ge448_sub(r, r ,PI_PTR(pi[(-aslide[i])/2])); ge448_sub(r, r, &pi[(-aslide[i])/2]);
if (bslide[i] > 0) if (bslide[i] > 0)
ge448_madd(r, r, &base_i[bslide[i]/2]); ge448_madd(r, r, &base_i[bslide[i]/2]);
@ -10765,10 +10762,8 @@ int ge448_double_scalarmult_vartime(ge448_p2 *r, const uint8_t *a,
XFREE(aslide, NULL, DYNAMIC_TYPE_TMP_BUFFER); XFREE(aslide, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (bslide) if (bslide)
XFREE(bslide, NULL, DYNAMIC_TYPE_TMP_BUFFER); XFREE(bslide, NULL, DYNAMIC_TYPE_TMP_BUFFER);
for (i = 0; i < (int)(sizeof pi / sizeof pi[0]); ++i) { if (pi)
if (pi[i]) XFREE(pi, NULL, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(pi[i], NULL, DYNAMIC_TYPE_TMP_BUFFER);
}
if (p2) if (p2)
XFREE(p2, NULL, DYNAMIC_TYPE_TMP_BUFFER); XFREE(p2, NULL, DYNAMIC_TYPE_TMP_BUFFER);