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/*
This file is part of GNUnet.
Copyright (C) 2012-2015 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Martin Schanzenbach
* @file src/zklaim/zklaim_functions.c
* @brief zklaim functions
*
*/
#include "platform.h"
#include "zklaim/zklaim.h"
#include "gcrypt.h"
#include "gnunet_zklaim_service.h"
#include "zklaim_functions.h"
int
ZKLAIM_context_sign (struct GNUNET_ZKLAIM_Context *ctx,
const struct GNUNET_CRYPTO_EcdsaPrivateKey *key)
{
int rc;
unsigned char *pubbuf;
size_t publen;
gcry_sexp_t priv;
gcry_sexp_t pub;
gcry_mpi_t q;
gcry_ctx_t gctx;
//TODO how to ensure not hashed??
zklaim_hash_ctx (ctx->ctx);
rc = gcry_sexp_build (&priv, NULL,
"(private-key(ecc(curve \"Ed25519\")"
"(d %b)))",
(int) sizeof (key->d), key->d);
if (0 != rc)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"GCRY error...\n");
return GNUNET_SYSERR;
}
gcry_mpi_ec_new (&gctx, priv, NULL);
q = gcry_mpi_ec_get_mpi ("q@eddsa", gctx, 0);
rc = gcry_sexp_build(&pub, NULL, "(key-data (public-key (ecc (curve Ed25519) (q %M))))", q);
if (0 != rc) {
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"GCRY error...\n");
return GNUNET_SYSERR;
}
gcry_mpi_release(q);
zklaim_pub2buf(pub, &pubbuf, &publen);
gcry_sexp_release(pub);
gcry_ctx_release (gctx);
memcpy(ctx->ctx->pub_key, pubbuf, sizeof(ctx->ctx->pub_key));
free(pubbuf);
return zklaim_ctx_sign (ctx->ctx, priv);
}
void
ZKLAIM_context_attributes_iterate (const struct GNUNET_ZKLAIM_Context *ctx,
GNUNET_ZKLAIM_PayloadIterator iter,
void *iter_cls)
{
int i;
int j;
uint64_t data;
char *attr_name;
char *tmp;
zklaim_wrap_payload_ctx *plw;
tmp = GNUNET_strdup (ctx->attrs);
attr_name = strtok (tmp, ",");
plw = ctx->ctx->pl_ctx_head;
for (i = 0; i < ctx->ctx->num_of_payloads; i++)
{
for (j = 0; j < ZKLAIM_MAX_PAYLOAD_ATTRIBUTES; j++)
{
if (NULL == attr_name)
break;
iter (iter_cls, attr_name, &data);
zklaim_set_attr (&plw->pl,
data,
j);
if ((attr_name - tmp) == (strlen (attr_name) + 1))
{
attr_name = NULL;
break;
}
attr_name = strtok (attr_name + strlen (attr_name) + 1, ",");
}
if (NULL == attr_name)
break;
plw = plw->next;
GNUNET_assert (NULL != plw);
}
GNUNET_free (tmp);
}
int
ZKLAIM_context_issue (struct GNUNET_ZKLAIM_Context *ctx,
const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
GNUNET_ZKLAIM_PayloadIterator iter,
void *iter_cls)
{
ZKLAIM_context_attributes_iterate (ctx,
iter,
iter_cls);
return ZKLAIM_context_sign (ctx,
key);
}
int
ZKLAIM_context_prove (struct GNUNET_ZKLAIM_Context *ctx,
GNUNET_ZKLAIM_PredicateIterator iter,
void *iter_cls)
{
int i;
int j;
int ret;
char *attr_name;
char *tmp;
zklaim_wrap_payload_ctx *plw;
tmp = GNUNET_strdup (ctx->attrs);
attr_name = strtok (tmp, ",");
plw = ctx->ctx->pl_ctx_head;
for (i = 0; i < ctx->ctx->num_of_payloads; i++)
{
for (j = 0; j < ZKLAIM_MAX_PAYLOAD_ATTRIBUTES; j++)
{
plw->pl.data_op[j] = zklaim_noop;
}
plw = plw->next;
}
plw = ctx->ctx->pl_ctx_head;
for (i = 0; i < ctx->ctx->num_of_payloads; i++)
{
for (j = 0; j < ZKLAIM_MAX_PAYLOAD_ATTRIBUTES; j++)
{
if (NULL == attr_name)
break;
iter (iter_cls,
attr_name,
&plw->pl.data_op[j],
&plw->pl.data_ref[j]);
if ((attr_name - tmp) == (strlen (attr_name) + 1))
{
attr_name = NULL;
break;
}
attr_name = strtok (attr_name + strlen (attr_name) + 1, ",");
}
if (NULL == attr_name)
break;
plw = plw->next;
GNUNET_assert (NULL != plw);
}
GNUNET_free (tmp);
ret = zklaim_proof_generate (ctx->ctx);
zklaim_clear_pres(ctx->ctx);
return ret;
}
int
ZKLAIM_context_verify (struct GNUNET_ZKLAIM_Context *ctx,
GNUNET_ZKLAIM_PredicateIterator iter,
void *iter_cls)
{
int i;
int j;
char *attr_name;
char *tmp;
zklaim_wrap_payload_ctx *plw;
tmp = GNUNET_strdup (ctx->attrs);
attr_name = strtok (tmp, ",");
plw = ctx->ctx->pl_ctx_head;
for (i = 0; i < ctx->ctx->num_of_payloads; i++)
{
for (j = 0; j < ZKLAIM_MAX_PAYLOAD_ATTRIBUTES; j++)
{
if (NULL == attr_name)
break;
iter (iter_cls,
attr_name,
&plw->pl.data_op[j],
&plw->pl.data_ref[j]);
if ((attr_name - tmp) == (strlen (attr_name) + 1))
{
attr_name = NULL;
break;
}
attr_name = strtok (attr_name + strlen (attr_name) + 1, ",");
}
if (NULL == attr_name)
break;
plw = plw->next;
GNUNET_assert (NULL != plw);
}
GNUNET_free (tmp);
return zklaim_ctx_verify (ctx->ctx);
}
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