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/*
This file is part of TALER
Copyright (C) 2024 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 util/donau_crypto.c
* @brief Cryptographic utility functions
* @author Lukas Matyja
*/
#include <taler/platform.h>
#include <taler/taler_util.h>
#include "donau_util.h"
#include <gcrypt.h>
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Structure we hash to compute the group key for
* a donation unit group.
*/
struct DonationUnitGroupP
{
/**
* Value of coins in this donation unit group.
*/
struct TALER_AmountNBO value;
/**
* Cipher used for the donation unit, in NBO.
*/
uint32_t cipher GNUNET_PACKED;
};
GNUNET_NETWORK_STRUCT_END
void
DONAU_donation_unit_group_get_key (
const struct DONAU_DonationUnitGroup *dg,
struct GNUNET_HashCode *key)
{
struct DonationUnitGroupP dgp = {
.cipher = htonl (dg->cipher)
};
TALER_amount_hton (&dgp.value,
&dg->value);
GNUNET_CRYPTO_hash (&dgp,
sizeof (dgp),
key);
}
int
DONAU_donation_unit_pub_cmp (
const struct DONAU_DonationUnitPublicKey *donation_unit1,
const struct DONAU_DonationUnitPublicKey *donation_unit2)
{
if (donation_unit1->bsign_pub_key->cipher !=
donation_unit2->bsign_pub_key->cipher)
return (donation_unit1->bsign_pub_key->cipher >
donation_unit2->bsign_pub_key->cipher) ? 1 : -1;
return GNUNET_CRYPTO_bsign_pub_cmp (donation_unit1->bsign_pub_key,
donation_unit2->bsign_pub_key);
}
void
DONAU_donation_unit_pub_deep_copy (
struct DONAU_DonationUnitPublicKey *donation_unit_dst,
const struct DONAU_DonationUnitPublicKey *donation_unit_src)
{
donation_unit_dst->bsign_pub_key
= GNUNET_CRYPTO_bsign_pub_incref (donation_unit_src->bsign_pub_key);
}
void
DONAU_donation_unit_pub_free (
struct DONAU_DonationUnitPublicKey *donation_unit_pub)
{
if (NULL != donation_unit_pub->bsign_pub_key)
{
GNUNET_CRYPTO_blind_sign_pub_decref (donation_unit_pub->bsign_pub_key);
donation_unit_pub->bsign_pub_key = NULL;
}
}
void
DONAU_blinded_donation_unit_sig_free (
struct DONAU_BlindedDonationUnitSignature *du_sig)
{
if (NULL != du_sig->blinded_sig)
{
GNUNET_CRYPTO_blinded_sig_decref (du_sig->blinded_sig);
du_sig->blinded_sig = NULL;
}
}
void
DONAU_donation_unit_pub_hash (
const struct DONAU_DonationUnitPublicKey *donation_unit_pub,
struct DONAU_DonationUnitHashP *donation_unit_hash
)
{
struct GNUNET_CRYPTO_BlindSignPublicKey *bsp
= donation_unit_pub->bsign_pub_key;
switch (bsp->cipher)
{
case GNUNET_CRYPTO_BSA_RSA:
/* Important: this MUST match the way the RSA-secmod does the
hashing of the public keys (see donau-httpd_keys.c) */
GNUNET_CRYPTO_rsa_public_key_hash (bsp->details.rsa_public_key,
&donation_unit_hash->hash);
break;
case GNUNET_CRYPTO_BSA_CS:
/* Important: this MUST match the way the CS-secmod does the
hashing of the public keys (see donau-httpd_keys.c) */
GNUNET_CRYPTO_hash (&bsp->details.cs_public_key,
sizeof(bsp->details.cs_public_key),
&donation_unit_hash->hash);
break;
default:
GNUNET_assert (0);
}
}
void
DONAU_unique_donor_id_hash (const struct DONAU_HashDonorTaxId *h_donor_tax_id,
const struct DONAU_UniqueDonorIdentifierNonce *nonce
,
struct DONAU_UniqueDonorIdentifierHashP *h_udi)
{
struct GNUNET_HashContext *hash_context;
hash_context = GNUNET_CRYPTO_hash_context_start ();
GNUNET_CRYPTO_hash_context_read (
hash_context,
h_donor_tax_id,
sizeof(struct DONAU_HashDonorTaxId));
GNUNET_CRYPTO_hash_context_read (
hash_context,
nonce,
sizeof(struct DONAU_UniqueDonorIdentifierNonce));
GNUNET_CRYPTO_hash_context_finish (
hash_context,
&h_udi->hash);
}
enum GNUNET_GenericReturnValue
DONAU_donation_receipt_verify (
const struct DONAU_DonationUnitPublicKey *donation_unit_pub,
const struct DONAU_UniqueDonorIdentifierHashP *h_udi,
const struct DONAU_DonationUnitSignature *donation_unit_sig)
{
return GNUNET_CRYPTO_blind_sig_verify (donation_unit_pub->bsign_pub_key,
donation_unit_sig->unblinded_sig,
h_udi,
sizeof (*h_udi));
}
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