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ecc shamir requires bigger LUT in fp mode

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This commit is contained in:
toddouska
2013-10-31 10:43:48 -07:00
parent 12b074fbe9
commit cc323fb4cc
2 changed files with 48 additions and 10 deletions
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20
ctaocrypt/src/ecc.c
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@@ -159,8 +159,10 @@ int ecc_projective_dbl_point(ecc_point* P, ecc_point* R, mp_int* modulus,
mp_digit* mp);
static int ecc_mulmod(mp_int* k, ecc_point *G, ecc_point *R, mp_int* modulus,
int map);
#ifdef ECC_SHAMIR
static int ecc_mul2add(ecc_point* A, mp_int* kA, ecc_point* B, mp_int* kB,
ecc_point* C, mp_int* modulus);
#endif
/* helper for either lib */
@@ -1514,14 +1516,14 @@ void ecc_free(ecc_key* key)
}
#ifdef ECC_SHAMIR
#ifdef USE_FAST_MATH
#define GEN_MEM_ERR FP_MEM
#else
#define GEN_MEM_ERR MP_MEM
#endif
#ifdef ECC_SHAMIR
/** Computes kA*A + kB*B = C using Shamir's Trick
A First point to multiply
kA What to multiple A by
@@ -2124,9 +2126,17 @@ int ecc_sig_size(ecc_key* key)
#define FP_LUT 8U
#endif
#if (FP_LUT > 12) || (FP_LUT < 2)
#error FP_LUT must be between 2 and 12 inclusively
#endif
#ifdef ECC_SHAMIR
/* Sharmir requires a bigger LUT, TAO */
#if (FP_LUT > 12) || (FP_LUT < 4)
#error FP_LUT must be between 4 and 12 inclusively
#endif
#else
#if (FP_LUT > 12) || (FP_LUT < 2)
#error FP_LUT must be between 2 and 12 inclusively
#endif
#endif
/** Our FP cache */
static struct {