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add CYASSL_SMALL_STACK define for normal math word array into dynamic memory

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Todd A Ouska 2011-09-19 13:02:51 -07:00
parent 343ec22c16
commit 8f81bf3526
1 changed files with 14 additions and 0 deletions
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14
ctaocrypt/src/integer.c
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@ -2012,7 +2012,11 @@ mp_montgomery_setup (mp_int * n, mp_digit * rho)
int fast_mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho) int fast_mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho)
{ {
int ix, res, olduse; int ix, res, olduse;
#ifdef CYASSL_SMALL_STACK
mp_word* W; /* uses dynamic memory and slower */
#else
mp_word W[MP_WARRAY]; mp_word W[MP_WARRAY];
#endif
/* get old used count */ /* get old used count */
olduse = x->used; olduse = x->used;
@ -2024,6 +2028,12 @@ int fast_mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho)
} }
} }
#ifdef CYASSL_SMALL_STACK
W = (mp_word*)XMALLOC(sizeof(mp_word) * MP_WARRAY, 0, DYNAMIC_TYPE_BIGINT);
if (W == NULL)
return MP_MEM;
#endif
/* first we have to get the digits of the input into /* first we have to get the digits of the input into
* an array of double precision words W[...] * an array of double precision words W[...]
*/ */
@ -2145,6 +2155,10 @@ int fast_mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho)
x->used = n->used + 1; x->used = n->used + 1;
mp_clamp (x); mp_clamp (x);
#ifdef CYASSL_SMALL_STACK
XFREE(W, 0, DYNAMIC_TYPE_BIGINT);
#endif
/* if A >= m then A = A - m */ /* if A >= m then A = A - m */
if (mp_cmp_mag (x, n) != MP_LT) { if (mp_cmp_mag (x, n) != MP_LT) {
return s_mp_sub (x, n, x); return s_mp_sub (x, n, x);