Bitcoin Core  0.20.99
P2P Digital Currency
ecmult.h
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1 /**********************************************************************
2  * Copyright (c) 2013, 2014, 2017 Pieter Wuille, Andrew Poelstra *
3  * Distributed under the MIT software license, see the accompanying *
4  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
5  **********************************************************************/
6 
7 #ifndef SECP256K1_ECMULT_H
8 #define SECP256K1_ECMULT_H
9 
10 #include "num.h"
11 #include "group.h"
12 #include "scalar.h"
13 #include "scratch.h"
14 
15 typedef struct {
16  /* For accelerating the computation of a*P + b*G: */
17  secp256k1_ge_storage (*pre_g)[]; /* odd multiples of the generator */
18 #ifdef USE_ENDOMORPHISM
19  secp256k1_ge_storage (*pre_g_128)[]; /* odd multiples of 2^128*generator */
20 #endif
22 
25 static void secp256k1_ecmult_context_build(secp256k1_ecmult_context *ctx, void **prealloc);
29 
31 static void secp256k1_ecmult(const secp256k1_ecmult_context *ctx, secp256k1_gej *r, const secp256k1_gej *a, const secp256k1_scalar *na, const secp256k1_scalar *ng);
32 
33 typedef int (secp256k1_ecmult_multi_callback)(secp256k1_scalar *sc, secp256k1_ge *pt, size_t idx, void *data);
34 
46 static int secp256k1_ecmult_multi_var(const secp256k1_callback* error_callback, const secp256k1_ecmult_context *ctx, secp256k1_scratch *scratch, secp256k1_gej *r, const secp256k1_scalar *inp_g_sc, secp256k1_ecmult_multi_callback cb, void *cbdata, size_t n);
47 
48 #endif /* SECP256K1_ECMULT_H */
static int secp256k1_ecmult_context_is_built(const secp256k1_ecmult_context *ctx)
static int secp256k1_ecmult_multi_var(const secp256k1_callback *error_callback, const secp256k1_ecmult_context *ctx, secp256k1_scratch *scratch, secp256k1_gej *r, const secp256k1_scalar *inp_g_sc, secp256k1_ecmult_multi_callback cb, void *cbdata, size_t n)
Multi-multiply: R = inp_g_sc * G + sum_i ni * Ai.
static void secp256k1_ecmult(const secp256k1_ecmult_context *ctx, secp256k1_gej *r, const secp256k1_gej *a, const secp256k1_scalar *na, const secp256k1_scalar *ng)
Double multiply: R = na*A + ng*G.
A group element of the secp256k1 curve, in jacobian coordinates.
Definition: group.h:24
static secp256k1_context * ctx
Definition: tests.c:36
static void secp256k1_ecmult_context_init(secp256k1_ecmult_context *ctx)
A group element of the secp256k1 curve, in affine coordinates.
Definition: group.h:14
A scalar modulo the group order of the secp256k1 curve.
Definition: scalar_4x64.h:13
static void secp256k1_ecmult_context_finalize_memcpy(secp256k1_ecmult_context *dst, const secp256k1_ecmult_context *src)
static const size_t SECP256K1_ECMULT_CONTEXT_PREALLOCATED_SIZE
Definition: ecmult.h:23
int() secp256k1_ecmult_multi_callback(secp256k1_scalar *sc, secp256k1_ge *pt, size_t idx, void *data)
Definition: ecmult.h:33
static void secp256k1_ecmult_context_build(secp256k1_ecmult_context *ctx, void **prealloc)
static void secp256k1_ecmult_context_clear(secp256k1_ecmult_context *ctx)