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This commit is contained in:
Markus Teich 2016-06-13 21:09:41 +02:00
parent 557fbe2cc3
commit 338c95de41
7 changed files with 252 additions and 138 deletions
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91
crypto.c
View File

@ -37,6 +37,11 @@ struct brandt_ec_pkey {
gcry_mpi_point_t ec_gen; gcry_mpi_point_t ec_gen;
gcry_ctx_t ec_ctx; gcry_ctx_t ec_ctx;
/**
* brandt_crypto_init
*
*
*/
void void
brandt_crypto_init () brandt_crypto_init ()
{ {
@ -154,29 +159,28 @@ brandt_mpi_scan_unsigned (gcry_mpi_t *result, const void *data, size_t size)
brandt_assert_gpgerr (rc); brandt_assert_gpgerr (rc);
} }
/* //gcry_mpi_point_t
gcry_mpi_point_t //deserialize_point(const struct brandt_point* data, const int len)
deserialize_point(const struct brandt_point* data, const int len) //{
{ // gcry_sexp_t s;
gcry_sexp_t s; // gcry_ctx_t ctx;
gcry_ctx_t ctx; // gcry_mpi_point_t ret;
gcry_mpi_point_t ret; // gcry_error_t rc;
gcry_error_t rc; //
// rc = gcry_sexp_build(&s, NULL, "(public-key(ecc(curve " CURVE ")(q %b)))",
// len, data);
// brandt_assert_gpgerr(rc);
//
// rc = gcry_mpi_ec_new(&ctx, s, NULL);
// brandt_assert_gpgerr(rc);
// gcry_sexp_release(s);
//
// ret = gcry_mpi_ec_get_point("q", ctx, 0);
// brandt_assert(ret);
// gcry_ctx_release(ctx);
// return ret;
//}
rc = gcry_sexp_build(&s, NULL, "(public-key(ecc(curve " CURVE ")(q %b)))",
len, data);
brandt_assert_gpgerr(rc);
rc = gcry_mpi_ec_new(&ctx, s, NULL);
brandt_assert_gpgerr(rc);
gcry_sexp_release(s);
ret = gcry_mpi_ec_get_point("q", ctx, 0);
brandt_assert(ret);
gcry_ctx_release(ctx);
return ret;
}
*/
/* --- EC --- */ /* --- EC --- */
@ -238,6 +242,11 @@ key_from_sexp (gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname,
return 0; return 0;
} }
/**
* brandt_ec_skey_create
*
* @param[out] skey where to store the generated secret key
*/
void void
brandt_ec_skey_create (gcry_mpi_t *skey) brandt_ec_skey_create (gcry_mpi_t *skey)
{ {
@ -259,14 +268,24 @@ brandt_ec_skey_create (gcry_mpi_t* skey)
gcry_sexp_release (priv_sexp); gcry_sexp_release (priv_sexp);
} }
/**
* brandt_ec_pkey_compute
*
* @param pkey TODO
* @param skey TODO
*/
void void
brandt_ec_pkey_compute (gcry_mpi_point_t *pkey, const gcry_mpi_t skey) brandt_ec_pkey_compute (gcry_mpi_point_t *pkey, const gcry_mpi_t skey)
{ {
} }
/**
* brandt_ec_keypair_create
*
* @param[out] pkey where to store the generated public key
* @param[out] skey where to store the generated secret key
*/
void void
brandt_ec_keypair_create (gcry_mpi_point_t *pkey, gcry_mpi_t *skey) brandt_ec_keypair_create (gcry_mpi_point_t *pkey, gcry_mpi_t *skey)
{ {
@ -295,9 +314,16 @@ brandt_ec_keypair_create (gcry_mpi_point_t* pkey, gcry_mpi_t* skey)
gcry_ctx_release (ctx); gcry_ctx_release (ctx);
} }
/**
* brandt_ec_keypair_create_base
*
* @param[out] pkey where to store the generated public key
* @param[out] skey where to store the generated secret key
* @param[in] base which base point should be used to calculate the public key
*/
void void
brandt_ec_keypair_create_base (gcry_mpi_point_t* pkey, gcry_mpi_t* skey, const gcry_mpi_point_t base) brandt_ec_keypair_create_base (gcry_mpi_point_t *pkey, gcry_mpi_t *skey,
const gcry_mpi_point_t base)
{ {
brandt_ec_skey_create (skey); brandt_ec_skey_create (skey);
brandt_assert (*skey); brandt_assert (*skey);
@ -306,7 +332,14 @@ brandt_ec_keypair_create_base (gcry_mpi_point_t* pkey, gcry_mpi_t* skey, const g
gcry_mpi_ec_mul (*pkey, *skey, base, ec_ctx); gcry_mpi_ec_mul (*pkey, *skey, base, ec_ctx);
} }
/**
* brandt_ec_point_cmp compares two curve points
*
* @param[in] a the first point
* @param[in] b the second point
* @return 0 if @a a and @a b represent the same point on the curve, something
* else otherwise
*/
int int
brandt_ec_point_cmp (const gcry_mpi_point_t a, const gcry_mpi_point_t b) brandt_ec_point_cmp (const gcry_mpi_point_t a, const gcry_mpi_point_t b)
{ {
@ -323,7 +356,8 @@ brandt_ec_point_cmp (const gcry_mpi_point_t a, const gcry_mpi_point_t b)
return 1; return 1;
} }
if (!gcry_mpi_ec_get_affine(ax, ay, a, ec_ctx) && !gcry_mpi_ec_get_affine(bx, by, b, ec_ctx)) if (!gcry_mpi_ec_get_affine (ax, ay, a, ec_ctx)
&& !gcry_mpi_ec_get_affine (bx, by, b, ec_ctx))
{ {
ret = gcry_mpi_cmp (ax, bx) || gcry_mpi_cmp (ay, by); ret = gcry_mpi_cmp (ax, bx) || gcry_mpi_cmp (ay, by);
} }
@ -335,7 +369,6 @@ brandt_ec_point_cmp (const gcry_mpi_point_t a, const gcry_mpi_point_t b)
return ret; return ret;
} }
/** /**
* Convert the given private key from the network format to the * Convert the given private key from the network format to the
* S-expression that can be used by libgcrypt. * S-expression that can be used by libgcrypt.

72
smc.c
View File

@ -22,13 +22,25 @@
#include <gcrypt.h> #include <gcrypt.h>
#include "crypto.h" #include "crypto.h"
#include "util.h"
#include "smc.h" #include "smc.h"
#include "util.h"
extern gcry_ctx_t ec_ctx; extern gcry_ctx_t ec_ctx;
/**
* smc_zkp_dl
*
* @param v TODO
* @param g TODO
* @param x TODO
* @param a TODO
* @param c TODO
* @param r TODO
*/
void void
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) 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)
{ {
gcry_mpi_t z = gcry_mpi_new (0); gcry_mpi_t z = gcry_mpi_new (0);
@ -42,8 +54,20 @@ smc_zkp_dl (gcry_mpi_point_t v, gcry_mpi_point_t g, gcry_mpi_t x, gcry_mpi_point
gcry_mpi_release (z); gcry_mpi_release (z);
} }
/**
* smc_zkp_dl_check
*
* @param v TODO
* @param g TODO
* @param a TODO
* @param c TODO
* @param r TODO
* @return 0 if the proof is correct, something else otherwise
*/
int int
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) 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)
{ {
int ret; int ret;
gcry_mpi_point_t left = gcry_mpi_point_new (0); gcry_mpi_point_t left = gcry_mpi_point_new (0);
@ -60,25 +84,23 @@ smc_zkp_dl_check (gcry_mpi_point_t v, gcry_mpi_point_t g, gcry_mpi_point_t a, gc
return ret; return ret;
} }
/* //GEN
GEN //smc_hextodec (const char *s)
smc_hextodec (const char *s) //{
{ // size_t i;
size_t i; // char c;
char c; // pari_sp ltop = avma;
pari_sp ltop = avma; // GEN ret = gen_0;
GEN ret = gen_0; //
// for (i = 0; i < strlen (s); i++)
for (i = 0; i < strlen (s); i++) // {
{ // errno = 0;
errno = 0; // if (1 != sscanf (&s[i], "%1hhx", &c))
if (1 != sscanf (&s[i], "%1hhx", &c)) // {
{ // brandt_eprintf ("failed to parse hex (\"%s\") to decimal:", s);
brandt_eprintf ("failed to parse hex (\"%s\") to decimal:", s); // return NULL;
return NULL; // }
} // ret = addis (shifti (ret, 4), c);
ret = addis (shifti (ret, 4), c); // }
} // return gerepilecopy (ltop, ret);
return gerepilecopy (ltop, ret); //}
}
*/

22
smc.h
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@ -1,3 +1,23 @@
/* This file is part of libbrandt.
* Copyright (C) 2016 GNUnet e.V.
*
* libbrandt is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libbrandt is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libbrandt. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file smc.h
* @brief describes the secure multiparty computation interface.
*/
#ifndef _BRANDT_SMC_H #ifndef _BRANDT_SMC_H
#define _BRANDT_SMC_H #define _BRANDT_SMC_H
@ -7,4 +27,4 @@
void 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); void 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);
int 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); int 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);
#endif #endif // ifndef _BRANDT_SMC_H

24
test.h
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@ -1,3 +1,23 @@
/* This file is part of libbrandt.
* Copyright (C) 2016 GNUnet e.V.
*
* libbrandt is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libbrandt is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libbrandt. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file test.h
* @brief Some helpers for running tests
*/
#ifndef _BRANDT_TEST_H #ifndef _BRANDT_TEST_H
#define _BRANDT_TEST_H #define _BRANDT_TEST_H
@ -7,6 +27,6 @@ int tests_run = 0;
int ret = 0; int ret = 0;
#define check(cond, message) do { if (!(cond)) { fputs (message, stderr); fputc ('\n', stderr); return 0; } } while (0) #define check(cond, message) do { if (!(cond)) { fputs (message, stderr); fputc ('\n', stderr); return 0; } } while (0)
#define run(test) do { tests_run++; if (!test()) ret = 1; } while (0) #define run(test) do { tests_run++; if (!test ()) { ret = 1; } } while (0)
#endif #endif // ifndef _BRANDT_TEST_H

19
test_crypto.c
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@ -1,4 +1,23 @@
/* This file is part of libbrandt.
* Copyright (C) 2016 GNUnet e.V.
*
* libbrandt is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libbrandt is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libbrandt. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file test_crypto.c
* @brief testing crypto and smc functions.
*/
#include "brandt.h" #include "brandt.h"
#include "crypto.h" #include "crypto.h"
#include "smc.h" #include "smc.h"

4
uncrustify/conf
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@ -1154,7 +1154,7 @@ nl_after_func_body_one_liner = 0 # number
# The minimum number of newlines before a multi-line comment. # The minimum number of newlines before a multi-line comment.
# Doesn't apply if after a brace open or another multi-line comment. # Doesn't apply if after a brace open or another multi-line comment.
nl_before_block_comment = 0 # number nl_before_block_comment = 1 # number
# The minimum number of newlines before a single-line C comment. # The minimum number of newlines before a single-line C comment.
# Doesn't apply if after a brace open or other single-line C comments. # Doesn't apply if after a brace open or other single-line C comments.
@ -1320,7 +1320,7 @@ cmt_cpp_nl_start = false # false/true
cmt_cpp_nl_end = false # false/true cmt_cpp_nl_end = false # false/true
# Whether to change cpp-comments into c-comments # Whether to change cpp-comments into c-comments
cmt_cpp_to_c = true # false/true cmt_cpp_to_c = false # false/true
# Whether to put a star on subsequent comment lines # Whether to put a star on subsequent comment lines
cmt_star_cont = true # false/true cmt_star_cont = true # false/true