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/*
This file is part of TALER
Copyright (C) 2020 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 secmod_signatures.c
* @brief Utility functions for Taler security module signatures
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_signatures.h"
void
TALER_wallet_link_sign (const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_TransferPublicKeyP *transfer_pub,
const void *coin_ev,
size_t coin_ev_size,
const struct TALER_CoinSpendPrivateKeyP *old_coin_priv,
struct TALER_CoinSpendSignatureP *coin_sig)
{
struct TALER_LinkDataPS ldp = {
.purpose.size = htonl (sizeof (ldp)),
.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_LINK),
.h_denom_pub = *h_denom_pub,
.transfer_pub = *transfer_pub
};
GNUNET_CRYPTO_hash (coin_ev,
coin_ev_size,
&ldp.coin_envelope_hash);
GNUNET_CRYPTO_eddsa_key_get_public (&old_coin_priv->eddsa_priv,
&ldp.old_coin_pub.eddsa_pub);
GNUNET_CRYPTO_eddsa_sign (&old_coin_priv->eddsa_priv,
&ldp,
&coin_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_wallet_link_verify (
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_TransferPublicKeyP *transfer_pub,
const void *coin_ev,
size_t coin_ev_size,
const struct TALER_CoinSpendPublicKeyP *old_coin_pub,
const struct TALER_CoinSpendSignatureP *coin_sig)
{
struct TALER_LinkDataPS ldp = {
.purpose.size = htonl (sizeof (ldp)),
.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_LINK),
.h_denom_pub = *h_denom_pub,
.old_coin_pub = *old_coin_pub,
.transfer_pub = *transfer_pub
};
GNUNET_CRYPTO_hash (coin_ev,
coin_ev_size,
&ldp.coin_envelope_hash);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_LINK,
&ldp,
&coin_sig->eddsa_signature,
&old_coin_pub->eddsa_pub);
}
/* end of wallet_signatures.c */
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