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Implementations for scalar without data-dependent branches.

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This commit is contained in:
Pieter Wuille
2014-10-29 00:35:49 -07:00
parent 0ce80ef47e
commit 1d52a8b155
10 changed files with 1194 additions and 57 deletions
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18
src/scalar.h
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@@ -7,10 +7,17 @@
#include "num.h"
/** A scalar modulo the group order of the secp256k1 curve. */
typedef struct {
secp256k1_num_t n;
} secp256k1_scalar_t;
#if defined HAVE_CONFIG_H
#include "libsecp256k1-config.h"
#endif
#if defined(USE_SCALAR_4X64)
#include "scalar_4x64.h"
#elif defined(USE_SCALAR_8X32)
#include "scalar_8x32.h"
#else
#error "Please select scalar implementation"
#endif
/** Clear a scalar to prevent the leak of sensitive data. */
void static secp256k1_scalar_clear(secp256k1_scalar_t *r);
@@ -30,6 +37,9 @@ void static secp256k1_scalar_add(secp256k1_scalar_t *r, const secp256k1_scalar_t
/** Multiply two scalars (modulo the group order). */
void static secp256k1_scalar_mul(secp256k1_scalar_t *r, const secp256k1_scalar_t *a, const secp256k1_scalar_t *b);
/** Compute the square of a scalar (modulo the group order). */
void static secp256k1_scalar_sqr(secp256k1_scalar_t *r, const secp256k1_scalar_t *a);
/** Compute the inverse of a scalar (modulo the group order). */
void static secp256k1_scalar_inverse(secp256k1_scalar_t *r, const secp256k1_scalar_t *a);