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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 wallet_signatures.c
* @brief Utility functions for Taler wallet signatures
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_signatures.h"
void
TALER_wallet_deposit_sign (
const struct TALER_Amount *amount,
const struct TALER_Amount *deposit_fee,
const struct TALER_MerchantWireHash *h_wire,
const struct TALER_PrivateContractHash *h_contract_terms,
const struct TALER_ExtensionContractHash *h_extensions,
const struct TALER_DenominationHash *h_denom_pub,
struct GNUNET_TIME_Absolute wallet_timestamp,
const struct TALER_MerchantPublicKeyP *merchant_pub,
struct GNUNET_TIME_Absolute refund_deadline,
const struct TALER_CoinSpendPrivateKeyP *coin_priv,
struct TALER_CoinSpendSignatureP *coin_sig)
{
struct TALER_DepositRequestPS dr = {
.purpose.size = htonl (sizeof (dr)),
.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT),
.h_contract_terms = *h_contract_terms,
.h_wire = *h_wire,
.h_denom_pub = *h_denom_pub,
.wallet_timestamp = GNUNET_TIME_absolute_hton (wallet_timestamp),
.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline),
.merchant = *merchant_pub
};
if (NULL != h_extensions)
dr.h_extensions = *h_extensions;
GNUNET_assert (GNUNET_OK ==
GNUNET_TIME_round_abs (&wallet_timestamp));
GNUNET_assert (GNUNET_OK ==
GNUNET_TIME_round_abs (&refund_deadline));
TALER_amount_hton (&dr.amount_with_fee,
amount);
TALER_amount_hton (&dr.deposit_fee,
deposit_fee);
GNUNET_CRYPTO_eddsa_sign (&coin_priv->eddsa_priv,
&dr,
&coin_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_wallet_deposit_verify (
const struct TALER_Amount *amount,
const struct TALER_Amount *deposit_fee,
const struct TALER_MerchantWireHash *h_wire,
const struct TALER_PrivateContractHash *h_contract_terms,
const struct TALER_ExtensionContractHash *h_extensions,
const struct TALER_DenominationHash *h_denom_pub,
struct GNUNET_TIME_Absolute wallet_timestamp,
const struct TALER_MerchantPublicKeyP *merchant_pub,
struct GNUNET_TIME_Absolute refund_deadline,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_CoinSpendSignatureP *coin_sig)
{
struct TALER_DepositRequestPS dr = {
.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT),
.purpose.size = htonl (sizeof (dr)),
.h_contract_terms = *h_contract_terms,
.h_wire = *h_wire,
.h_denom_pub = *h_denom_pub,
.wallet_timestamp = GNUNET_TIME_absolute_hton (wallet_timestamp),
.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline),
.merchant = *merchant_pub
};
if (NULL != h_extensions)
dr.h_extensions = *h_extensions;
TALER_amount_hton (&dr.amount_with_fee,
amount);
TALER_amount_hton (&dr.deposit_fee,
deposit_fee);
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
&dr,
&coin_sig->eddsa_signature,
&coin_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
void
TALER_wallet_link_sign (const struct TALER_DenominationHash *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.hash);
GNUNET_CRYPTO_eddsa_sign (&old_coin_priv->eddsa_priv,
&ldp,
&coin_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_wallet_link_verify (
const struct TALER_DenominationHash *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,
.transfer_pub = *transfer_pub
};
GNUNET_CRYPTO_hash (coin_ev,
coin_ev_size,
&ldp.coin_envelope_hash.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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