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/*
This file is part of TALER
Copyright (C) 2020, 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 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"
/**
* @brief format used by the signing crypto helper when affirming
* that it created an exchange signing key.
*/
struct TALER_SigningKeyAnnouncementPS
{
/**
* Purpose must be #TALER_SIGNATURE_SM_SIGNING_KEY.
* Used with an EdDSA signature of a `struct TALER_SecurityModulePublicKeyP`.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Public signing key of the exchange this is about.
*/
struct TALER_ExchangePublicKeyP exchange_pub;
/**
* When does the key become available?
*/
struct GNUNET_TIME_TimestampNBO anchor_time;
/**
* How long is the key available after @e anchor_time?
*/
struct GNUNET_TIME_RelativeNBO duration;
};
void
TALER_exchange_secmod_eddsa_sign (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePrivateKeyP *secm_priv,
struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_SigningKeyAnnouncementPS ska = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_SIGNING_KEY),
.purpose.size = htonl (sizeof (ska)),
.exchange_pub = *exchange_pub,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration = GNUNET_TIME_relative_hton (duration)
};
GNUNET_CRYPTO_eddsa_sign (&secm_priv->eddsa_priv,
&ska,
&secm_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_exchange_secmod_eddsa_verify (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePublicKeyP *secm_pub,
const struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_SigningKeyAnnouncementPS ska = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_SIGNING_KEY),
.purpose.size = htonl (sizeof (ska)),
.exchange_pub = *exchange_pub,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration = GNUNET_TIME_relative_hton (duration)
};
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_SM_SIGNING_KEY,
&ska,
&secm_sig->eddsa_signature,
&secm_pub->eddsa_pub);
}
/**
* @brief format used by the denomination crypto helper when affirming
* that it created a denomination key.
*/
struct TALER_DenominationKeyAnnouncementPS
{
/**
* Purpose must be #TALER_SIGNATURE_SM_RSA_DENOMINATION_KEY.
* Used with an EdDSA signature of a `struct TALER_SecurityModulePublicKeyP`.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Hash of the denomination public key.
*/
struct TALER_DenominationHashP h_denom;
/**
* Hash of the section name in the configuration of this denomination.
*/
struct GNUNET_HashCode h_section_name;
/**
* When does the key become available?
*/
struct GNUNET_TIME_TimestampNBO anchor_time;
/**
* How long is the key available after @e anchor_time?
*/
struct GNUNET_TIME_RelativeNBO duration_withdraw;
};
void
TALER_exchange_secmod_rsa_sign (
const struct TALER_RsaPubHashP *h_rsa,
const char *section_name,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePrivateKeyP *secm_priv,
struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_DenominationKeyAnnouncementPS dka = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_RSA_DENOMINATION_KEY),
.purpose.size = htonl (sizeof (dka)),
.h_denom.hash = h_rsa->hash,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration_withdraw = GNUNET_TIME_relative_hton (duration)
};
GNUNET_CRYPTO_hash (section_name,
strlen (section_name) + 1,
&dka.h_section_name);
GNUNET_CRYPTO_eddsa_sign (&secm_priv->eddsa_priv,
&dka,
&secm_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_exchange_secmod_rsa_verify (
const struct TALER_RsaPubHashP *h_rsa,
const char *section_name,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePublicKeyP *secm_pub,
const struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_DenominationKeyAnnouncementPS dka = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_RSA_DENOMINATION_KEY),
.purpose.size = htonl (sizeof (dka)),
.h_denom.hash = h_rsa->hash,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration_withdraw = GNUNET_TIME_relative_hton (duration)
};
GNUNET_CRYPTO_hash (section_name,
strlen (section_name) + 1,
&dka.h_section_name);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_SM_RSA_DENOMINATION_KEY,
&dka,
&secm_sig->eddsa_signature,
&secm_pub->eddsa_pub);
}
void
TALER_exchange_secmod_cs_sign (
const struct TALER_CsPubHashP *h_cs,
const char *section_name,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePrivateKeyP *secm_priv,
struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_DenominationKeyAnnouncementPS dka = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_CS_DENOMINATION_KEY),
.purpose.size = htonl (sizeof (dka)),
.h_denom.hash = h_cs->hash,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration_withdraw = GNUNET_TIME_relative_hton (duration)
};
GNUNET_CRYPTO_hash (section_name,
strlen (section_name) + 1,
&dka.h_section_name);
GNUNET_CRYPTO_eddsa_sign (&secm_priv->eddsa_priv,
&dka,
&secm_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_exchange_secmod_cs_verify (
const struct TALER_CsPubHashP *h_cs,
const char *section_name,
struct GNUNET_TIME_Timestamp start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePublicKeyP *secm_pub,
const struct TALER_SecurityModuleSignatureP *secm_sig)
{
struct TALER_DenominationKeyAnnouncementPS dka = {
.purpose.purpose = htonl (TALER_SIGNATURE_SM_CS_DENOMINATION_KEY),
.purpose.size = htonl (sizeof (dka)),
.h_denom.hash = h_cs->hash,
.anchor_time = GNUNET_TIME_timestamp_hton (start_sign),
.duration_withdraw = GNUNET_TIME_relative_hton (duration)
};
GNUNET_CRYPTO_hash (section_name,
strlen (section_name) + 1,
&dka.h_section_name);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_SM_CS_DENOMINATION_KEY,
&dka,
&secm_sig->eddsa_signature,
&secm_pub->eddsa_pub);
}
/* end of secmod_signatures.c */
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