1 /**********************************************************************
2 * Copyright (c) 2013, 2014 Pieter Wuille *
3 * Distributed under the MIT software license, see the accompanying *
4 * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
5 **********************************************************************/
7 #ifndef _SECP256K1_ECMULT_
8 #define _SECP256K1_ECMULT_
14 /* For accelerating the computation of a*P + b*G: */
15 secp256k1_ge_storage_t (*pre_g)[]; /* odd multiples of the generator */
16 #ifdef USE_ENDOMORPHISM
17 secp256k1_ge_storage_t (*pre_g_128)[]; /* odd multiples of 2^128*generator */
19 } secp256k1_ecmult_context_t;
21 static void secp256k1_ecmult_context_init(secp256k1_ecmult_context_t *ctx);
22 static void secp256k1_ecmult_context_build(secp256k1_ecmult_context_t *ctx, const callback_t *cb);
23 static void secp256k1_ecmult_context_clone(secp256k1_ecmult_context_t *dst,
24 const secp256k1_ecmult_context_t *src, const callback_t *cb);
25 static void secp256k1_ecmult_context_clear(secp256k1_ecmult_context_t *ctx);
26 static int secp256k1_ecmult_context_is_built(const secp256k1_ecmult_context_t *ctx);
28 /** Double multiply: R = na*A + ng*G */
29 static void secp256k1_ecmult(const secp256k1_ecmult_context_t *ctx, secp256k1_gej_t *r, const secp256k1_gej_t *a, const secp256k1_scalar_t *na, const secp256k1_scalar_t *ng);