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/*
This file is part of TALER
Copyright (C) 2021 Taler Systems SA
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file denom.c
* @brief denomination utility functions
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
void
TALER_denom_pub_hash (const struct TALER_DenominationPublicKey *denom_pub,
struct TALER_DenominationHash *denom_hash)
{
uint32_t opt[2] = {
htonl (denom_pub->age_mask),
htonl ((uint32_t) denom_pub->cipher)
};
struct GNUNET_HashContext *hc;
hc = GNUNET_CRYPTO_hash_context_start ();
GNUNET_CRYPTO_hash_context_read (hc,
opt,
sizeof (opt));
switch (denom_pub->cipher)
{
case TALER_DENOMINATION_RSA:
{
void *buf;
size_t blen;
blen = GNUNET_CRYPTO_rsa_public_key_encode (
denom_pub->details.rsa_public_key,
&buf);
GNUNET_CRYPTO_hash_context_read (hc,
buf,
blen);
GNUNET_free (buf);
}
break;
// TODO: add case for Clause-Schnorr
default:
GNUNET_assert (0);
}
GNUNET_CRYPTO_hash_context_finish (hc,
&denom_hash->hash);
}
void
TALER_denom_priv_to_pub (const struct TALER_DenominationPrivateKey *denom_priv,
uint32_t age_mask,
struct TALER_DenominationPublicKey *denom_pub)
{
switch (denom_priv->cipher)
{
case TALER_DENOMINATION_RSA:
denom_pub->cipher = TALER_DENOMINATION_RSA;
denom_pub->age_mask = age_mask;
denom_pub->details.rsa_public_key
= GNUNET_CRYPTO_rsa_private_key_get_public (
denom_priv->details.rsa_private_key);
return;
// TODO: add case for Clause-Schnorr
default:
GNUNET_assert (0);
}
}
enum GNUNET_GenericReturnValue
TALER_denom_pub_verify (const struct TALER_DenominationPublicKey *denom_pub,
const struct TALER_DenominationSignature *denom_sig,
const struct TALER_CoinPubHash *c_hash)
{
if (denom_pub->cipher != denom_sig->cipher)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
switch (denom_pub->cipher)
{
case TALER_DENOMINATION_RSA:
if (GNUNET_OK !=
GNUNET_CRYPTO_rsa_verify (&c_hash->hash,
denom_sig->details.rsa_signature,
denom_pub->details.rsa_public_key))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Coin signature is invalid\n");
return GNUNET_NO;
}
return GNUNET_YES;
// TODO: add case for Clause-Schnorr
default:
GNUNET_assert (0);
}
}
/* end of denom.c */
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