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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 tokens.c
* @brief token family utility functions
* @author Christian Blättler
*/
#include "platform.h"
#include "taler_util.h"
void
TALER_token_issue_sig_free (struct TALER_TokenIssueSignatureP *issue_sig)
{
if (NULL != issue_sig->signature)
{
GNUNET_CRYPTO_unblinded_sig_decref (issue_sig->signature);
issue_sig->signature = NULL;
}
}
void
TALER_blinded_issue_sig_free (
struct TALER_TokenIssueBlindSignatureP *issue_sig)
{
if (NULL != issue_sig->signature)
{
GNUNET_CRYPTO_blinded_sig_decref (issue_sig->signature);
issue_sig->signature = NULL;
}
}
void
TALER_token_use_setup_random (struct TALER_TokenUseMasterSecretP *master)
{
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
master,
sizeof (*master));
}
void
TALER_token_use_setup_priv (
const struct TALER_TokenUseMasterSecretP *master,
const struct TALER_TokenUseMerchantValues *alg_values,
struct TALER_TokenUsePrivateKeyP *token_priv)
{
/* TODO: Maybe extract common code between this
function and TALER_planchet_setup_coin_priv (). */
const struct GNUNET_CRYPTO_BlindingInputValues *bi
= alg_values->blinding_inputs;
switch (bi->cipher)
{
case GNUNET_CRYPTO_BSA_INVALID:
GNUNET_break (0);
memset (token_priv,
0,
sizeof (*token_priv));
return;
case GNUNET_CRYPTO_BSA_RSA:
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (token_priv,
sizeof (*token_priv),
"token",
strlen ("token"),
master,
sizeof(*master),
NULL,
0));
return;
case GNUNET_CRYPTO_BSA_CS:
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (token_priv,
sizeof (*token_priv),
"token",
strlen ("token"),
master,
sizeof(*master),
&bi->details.cs_values,
sizeof(bi->details.cs_values),
NULL,
0));
return;
}
GNUNET_assert (0);
}
void
TALER_token_use_blinding_secret_create (
const struct TALER_TokenUseMasterSecretP *master,
const struct TALER_TokenUseMerchantValues *alg_values,
union GNUNET_CRYPTO_BlindingSecretP *bks)
{
/* TODO: Extract common code between this
function and TALER_planchet_blinding_secret_create (). */
const struct GNUNET_CRYPTO_BlindingInputValues *bi =
alg_values->blinding_inputs;
switch (bi->cipher)
{
case GNUNET_CRYPTO_BSA_INVALID:
GNUNET_break (0);
return;
case GNUNET_CRYPTO_BSA_RSA:
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (&bks->rsa_bks,
sizeof (bks->rsa_bks),
"bks",
strlen ("bks"),
master,
sizeof(*master),
NULL,
0));
return;
case GNUNET_CRYPTO_BSA_CS:
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (&bks->nonce,
sizeof (bks->nonce),
"bseed",
strlen ("bseed"),
master,
sizeof(*master),
&bi->details.cs_values,
sizeof(bi->details.cs_values),
NULL,
0));
return;
}
GNUNET_assert (0);
}
const struct TALER_TokenUseMerchantValues *
TALER_token_blind_input_rsa_singleton ()
{
static struct GNUNET_CRYPTO_BlindingInputValues bi = {
.cipher = GNUNET_CRYPTO_BSA_RSA
};
static struct TALER_TokenUseMerchantValues alg_values = {
.blinding_inputs = &bi
};
return &alg_values;
}
void
TALER_token_blind_input_copy (struct TALER_TokenUseMerchantValues *bi_dst,
const struct TALER_TokenUseMerchantValues *bi_src)
{
if (bi_src == TALER_token_blind_input_rsa_singleton ())
{
*bi_dst = *bi_src;
return;
}
bi_dst->blinding_inputs
= GNUNET_CRYPTO_blinding_input_values_incref (bi_src->blinding_inputs);
}
enum GNUNET_GenericReturnValue
TALER_token_issue_sign (const struct TALER_TokenIssuePrivateKeyP *issue_priv,
const struct TALER_TokenEnvelopeP *envelope,
struct TALER_TokenIssueBlindSignatureP *issue_sig)
{
issue_sig->signature
= GNUNET_CRYPTO_blind_sign (issue_priv->private_key,
"tk", /* TODO: What is a good value here? */
envelope->blinded_pub);
if (NULL == issue_sig->signature)
return GNUNET_SYSERR;
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_token_issue_verify (const struct TALER_TokenUsePublicKeyP *use_pub,
const struct TALER_TokenIssuePublicKeyP *issue_pub,
const struct TALER_TokenIssueSignatureP *ub_sig)
{
struct GNUNET_HashCode h_use_pub;
GNUNET_CRYPTO_hash (&use_pub->public_key,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
&h_use_pub);
if (GNUNET_OK !=
GNUNET_CRYPTO_blind_sig_verify (issue_pub->public_key,
ub_sig->signature,
&h_use_pub,
sizeof (h_use_pub)))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_token_issue_sig_unblind (
struct TALER_TokenIssueSignatureP *issue_sig,
const struct TALER_TokenIssueBlindSignatureP *blinded_sig,
const union GNUNET_CRYPTO_BlindingSecretP *secret,
const struct TALER_TokenUsePublicKeyHashP *use_pub_hash,
const struct TALER_TokenUseMerchantValues *alg_values,
const struct TALER_TokenIssuePublicKeyP *issue_pub)
{
issue_sig->signature
= GNUNET_CRYPTO_blind_sig_unblind (blinded_sig->signature,
secret,
&use_pub_hash->hash,
sizeof (use_pub_hash->hash),
alg_values->blinding_inputs,
issue_pub->public_key);
if (NULL == issue_sig->signature)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
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