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Default selection of field/scalar inverse implementation #331

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Default selection of field/scalar inverse implementation #331

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10 changes: 10 additions & 0 deletions src/field_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,16 @@ static void secp256k1_fe_inv(secp256k1_fe *r, const secp256k1_fe *a) {
}

static void secp256k1_fe_inv_var(secp256k1_fe *r, const secp256k1_fe *a) {
#if !defined(USE_FIELD_INV_BUILTIN) && !defined(USE_FIELD_INV_NUM)
/* In case no field inverse implementation has been selected,
choose one based on num implementation. */
#if defined(USE_NUM_GMP)
#define USE_FIELD_INV_NUM 1 /* "NUM" implementation requires GMP */
#else
#define USE_FIELD_INV_BUILTIN 1
#endif
#endif

#if defined(USE_FIELD_INV_BUILTIN)
secp256k1_fe_inv(r, a);
#elif defined(USE_FIELD_INV_NUM)
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10 changes: 10 additions & 0 deletions src/scalar_impl.h
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Expand Up @@ -240,6 +240,16 @@ SECP256K1_INLINE static int secp256k1_scalar_is_even(const secp256k1_scalar *a)
}

static void secp256k1_scalar_inverse_var(secp256k1_scalar *r, const secp256k1_scalar *x) {
#if !defined(USE_SCALAR_INV_BUILTIN) && !defined(USE_SCALAR_INV_NUM)
/* In case no scalar inverse implementation has been selected,
choose one based on num implementation. */
#if defined(USE_NUM_GMP)
#define USE_SCALAR_INV_NUM 1 /* "NUM" implementation requires GMP */
#else
#define USE_SCALAR_INV_BUILTIN 1
#endif
#endif

#if defined(USE_SCALAR_INV_BUILTIN)
secp256k1_scalar_inverse(r, x);
#elif defined(USE_SCALAR_INV_NUM)
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