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/*
This file is part of TALER
Copyright (C) 2023 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 aml_signatures.c
* @brief Utility functions for AML officers
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_signatures.h"
GNUNET_NETWORK_STRUCT_BEGIN
/**
* @brief Format used to generate the signature on an AML decision.
*/
struct TALER_AmlDecisionPS
{
/**
* Purpose must be #TALER_SIGNATURE_AML_DECISION.
* Used for an EdDSA signature with the `struct TALER_AmlOfficerPublicKeyP`.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* Hash over the justification text.
*/
struct GNUNET_HashCode h_justification GNUNET_PACKED;
/**
* Time when this decision was made.
*/
struct GNUNET_TIME_TimestampNBO decision_time;
/**
* New threshold for triggering possibly a new AML process.
*/
struct TALER_AmountNBO new_threshold;
/**
* Hash of the account identifier to which the decision applies.
*/
struct TALER_PaytoHashP h_payto GNUNET_PACKED;
/**
* What is the new AML status?
*/
uint32_t new_state GNUNET_PACKED;
};
GNUNET_NETWORK_STRUCT_END
void
TALER_officer_aml_decision_sign (
const char *justification,
struct GNUNET_TIME_Timestamp decision_time,
const struct TALER_Amount *new_threshold,
const struct TALER_PaytoHashP *h_payto,
enum TALER_AmlDecisionState new_state,
const struct TALER_AmlOfficerPrivateKeyP *officer_priv,
struct TALER_AmlOfficerSignatureP *officer_sig)
{
struct TALER_AmlDecisionPS ad = {
.purpose.purpose = htonl (TALER_SIGNATURE_AML_DECISION),
.purpose.size = htonl (sizeof (ad)),
.h_payto = *h_payto,
.new_state = htonl ((uint32_t) new_state)
};
GNUNET_CRYPTO_hash (justification,
strlen (justification),
&ad.h_justification);
TALER_amount_hton (&ad.new_threshold,
new_threshold);
GNUNET_CRYPTO_eddsa_sign (&officer_priv->eddsa_priv,
&ad,
&officer_sig->eddsa_signature);
}
enum GNUNET_GenericReturnValue
TALER_officer_aml_decision_verify (
const char *justification,
struct GNUNET_TIME_Timestamp decision_time,
const struct TALER_Amount *new_threshold,
const struct TALER_PaytoHashP *h_payto,
enum TALER_AmlDecisionState new_state,
const struct TALER_AmlOfficerPublicKeyP *officer_pub,
const struct TALER_AmlOfficerSignatureP *officer_sig)
{
struct TALER_AmlDecisionPS ad = {
.purpose.purpose = htonl (TALER_SIGNATURE_AML_DECISION),
.purpose.size = htonl (sizeof (ad)),
.h_payto = *h_payto,
.new_state = htonl ((uint32_t) new_state)
};
GNUNET_CRYPTO_hash (justification,
strlen (justification),
&ad.h_justification);
TALER_amount_hton (&ad.new_threshold,
new_threshold);
return GNUNET_CRYPTO_eddsa_verify (
TALER_SIGNATURE_AML_DECISION,
&ad,
&officer_sig->eddsa_signature,
&officer_pub->eddsa_pub);
}
GNUNET_NETWORK_STRUCT_BEGIN
/**
* @brief Format used to generate the signature on any AML query.
*/
struct TALER_AmlQueryPS
{
/**
* Purpose must be #TALER_SIGNATURE_AML_QUERY.
* Used for an EdDSA signature with the `struct TALER_AmlOfficerPublicKeyP`.
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
};
GNUNET_NETWORK_STRUCT_END
void
TALER_officer_aml_query_sign (
const struct TALER_AmlOfficerPrivateKeyP *officer_priv,
struct TALER_AmlOfficerSignatureP *officer_sig)
{
struct TALER_AmlQueryPS aq = {
.purpose.purpose = htonl (TALER_SIGNATURE_AML_QUERY),
.purpose.size = htonl (sizeof (aq))
};
GNUNET_CRYPTO_eddsa_sign (&officer_priv->eddsa_priv,
&aq,
&officer_sig->eddsa_signature);
}
/**
* Verify AML query authorization.
*
* @param officer_pub public key of AML officer
* @param officer_sig signature to verify
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_officer_aml_query_verify (
const struct TALER_AmlOfficerPublicKeyP *officer_pub,
const struct TALER_AmlOfficerSignatureP *officer_sig)
{
struct TALER_AmlQueryPS aq = {
.purpose.purpose = htonl (TALER_SIGNATURE_AML_QUERY),
.purpose.size = htonl (sizeof (aq))
};
return GNUNET_CRYPTO_eddsa_verify (
TALER_SIGNATURE_AML_QUERY,
&aq,
&officer_sig->eddsa_signature,
&officer_pub->eddsa_pub);
}
/* end of aml_signatures.c */
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