85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* This file is part of libbrandt.
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* Copyright (C) 2016 GNUnet e.V.
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*
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* libbrandt is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libbrandt is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* libbrandt. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file smc.c
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* @brief Implementation of the smc primitives.
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*/
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#include <gcrypt.h>
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#include "crypto.h"
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#include "util.h"
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#include "smc.h"
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extern gcry_ctx_t ec_ctx;
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void
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smc_zkp_dl (gcry_mpi_point_t v, gcry_mpi_point_t g, gcry_mpi_t x, gcry_mpi_point_t *a, gcry_mpi_t *c, gcry_mpi_t *r)
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{
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gcry_mpi_t z = gcry_mpi_new(0);
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brandt_ec_keypair_create_base(a, &z, g);
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/**TODO: generate c from HASH(g,v,a) and don't output it */
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brandt_ec_skey_create(c);
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*r = gcry_mpi_new(0);
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gcry_mpi_mul(*r, *c, x);
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gcry_mpi_add(*r, *r, z);
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gcry_mpi_release(z);
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}
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int
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smc_zkp_dl_check (gcry_mpi_point_t v, gcry_mpi_point_t g, gcry_mpi_point_t a, gcry_mpi_t c, gcry_mpi_t r)
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{
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int ret;
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gcry_mpi_point_t left = gcry_mpi_point_new(0);
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gcry_mpi_point_t right = gcry_mpi_point_new(0);
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gcry_mpi_ec_mul(left, r, g, ec_ctx);
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gcry_mpi_ec_mul(right, c, v, ec_ctx);
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gcry_mpi_ec_add(right, a, right, ec_ctx);
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ret = brandt_ec_point_cmp(left, right);
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gcry_mpi_point_release(left);
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gcry_mpi_point_release(right);
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return ret;
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}
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/*
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GEN
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smc_hextodec (const char *s)
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{
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size_t i;
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char c;
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pari_sp ltop = avma;
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GEN ret = gen_0;
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for (i = 0; i < strlen (s); i++)
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{
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errno = 0;
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if (1 != sscanf (&s[i], "%1hhx", &c))
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{
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brandt_eprintf ("failed to parse hex (\"%s\") to decimal:", s);
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return NULL;
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}
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ret = addis (shifti (ret, 4), c);
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}
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return gerepilecopy (ltop, ret);
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}
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*/
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