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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 merchant_signatures.c
* @brief Utility functions for Taler merchant signatures
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_signatures.h"
/**
* @brief Format used to generate the signature on a request to refund
* a coin into the account of the customer.
*/
struct TALER_RefundRequestPS
{
/**
* Purpose must be #TALER_SIGNATURE_MERCHANT_REFUND.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Hash over the proposal data to identify the contract
* which is being refunded.
*/
struct TALER_PrivateContractHashP h_contract_terms GNUNET_PACKED;
/**
* The coin's public key. This is the value that must have been
* signed (blindly) by the Exchange.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Merchant-generated transaction ID for the refund.
*/
uint64_t rtransaction_id GNUNET_PACKED;
/**
* Amount to be refunded, including refund fee charged by the
* exchange to the customer.
*/
struct TALER_AmountNBO refund_amount;
};
void
TALER_merchant_refund_sign (
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
uint64_t rtransaction_id,
const struct TALER_Amount *amount,
const struct TALER_MerchantPrivateKeyP *merchant_priv,
struct TALER_MerchantSignatureP *merchant_sig)
{
struct TALER_RefundRequestPS rr = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND),
.purpose.size = htonl (sizeof (rr)),
.h_contract_terms = *h_contract_terms,
.coin_pub = *coin_pub,
.rtransaction_id = GNUNET_htonll (rtransaction_id)
};
TALER_amount_hton (&rr.refund_amount,
amount);
GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv,
&rr,
&merchant_sig->eddsa_sig);
}
enum GNUNET_GenericReturnValue
TALER_merchant_refund_verify (
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
uint64_t rtransaction_id,
const struct TALER_Amount *amount,
const struct TALER_MerchantPublicKeyP *merchant_pub,
const struct TALER_MerchantSignatureP *merchant_sig)
{
struct TALER_RefundRequestPS rr = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND),
.purpose.size = htonl (sizeof (rr)),
.h_contract_terms = *h_contract_terms,
.coin_pub = *coin_pub,
.rtransaction_id = GNUNET_htonll (rtransaction_id)
};
TALER_amount_hton (&rr.refund_amount,
amount);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_REFUND,
&rr,
&merchant_sig->eddsa_sig,
&merchant_pub->eddsa_pub);
}
/**
* @brief Information signed by the exchange's master
* key affirming the IBAN details for the exchange.
*/
struct TALER_MerchantWireDetailsPS
{
/**
* Purpose is #TALER_SIGNATURE_MERCHANT_WIRE_DETAILS.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Salted hash over the account holder's payto:// URL and
* the salt, as done by #TALER_merchant_wire_signature_hash().
*/
struct TALER_MerchantWireHashP h_wire_details GNUNET_PACKED;
};
enum GNUNET_GenericReturnValue
TALER_merchant_wire_signature_check (
const char *payto_uri,
const struct TALER_WireSaltP *salt,
const struct TALER_MerchantPublicKeyP *merch_pub,
const struct TALER_MerchantSignatureP *merch_sig)
{
struct TALER_MerchantWireDetailsPS wd = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS),
.purpose.size = htonl (sizeof (wd))
};
TALER_merchant_wire_signature_hash (payto_uri,
salt,
&wd.h_wire_details);
return GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS,
&wd,
&merch_sig->eddsa_sig,
&merch_pub->eddsa_pub);
}
void
TALER_merchant_wire_signature_make (
const char *payto_uri,
const struct TALER_WireSaltP *salt,
const struct TALER_MerchantPrivateKeyP *merch_priv,
struct TALER_MerchantSignatureP *merch_sig)
{
struct TALER_MerchantWireDetailsPS wd = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS),
.purpose.size = htonl (sizeof (wd))
};
TALER_merchant_wire_signature_hash (payto_uri,
salt,
&wd.h_wire_details);
GNUNET_CRYPTO_eddsa_sign (&merch_priv->eddsa_priv,
&wd,
&merch_sig->eddsa_sig);
}
/**
* Used by merchants to return signed responses to /pay requests.
* Currently only used to return 200 OK signed responses.
*/
struct TALER_PaymentResponsePS
{
/**
* Set to #TALER_SIGNATURE_MERCHANT_PAYMENT_OK. Note that
* unsuccessful payments are usually proven by some exchange's signature.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Hash of the proposal data associated with this confirmation
*/
struct TALER_PrivateContractHashP h_contract_terms;
};
void
TALER_merchant_pay_sign (
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_MerchantPrivateKeyP *merch_priv,
struct GNUNET_CRYPTO_EddsaSignature *merch_sig)
{
struct TALER_PaymentResponsePS mr = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_PAYMENT_OK),
.purpose.size = htonl (sizeof (mr)),
.h_contract_terms = *h_contract_terms
};
GNUNET_CRYPTO_eddsa_sign (&merch_priv->eddsa_priv,
&mr,
merch_sig);
}
enum GNUNET_GenericReturnValue
TALER_merchant_pay_verify (
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_MerchantPublicKeyP *merchant_pub,
const struct TALER_MerchantSignatureP *merchant_sig)
{
struct TALER_PaymentResponsePS pr = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_PAYMENT_OK),
.purpose.size = htonl (sizeof (pr)),
.h_contract_terms = *h_contract_terms
};
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_PAYMENT_OK,
&pr,
&merchant_sig->eddsa_sig,
&merchant_pub->eddsa_pub);
}
/* end of merchant_signatures.c */
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