1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
This file is part of TALER
Copyright (C) 2015-2022 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 lib/exchange_api_common.h
* @brief common functions for the exchange API
* @author Christian Grothoff
*/
#ifndef EXCHANGE_API_COMMON_H
#define EXCHANGE_API_COMMON_H
#include "taler_json_lib.h"
#include "taler_exchange_service.h"
/**
* Check proof of a purse creation conflict.
*
* @param cpurse_sig conflicting signature (must
* not match the signature from the proof)
* @param purse_pub the public key (must match
* the signature from the proof)
* @param proof the proof to check
* @return #GNUNET_OK if the @a proof is OK for @a purse_pub and conflicts with @a cpurse_sig
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_purse_create_conflict_ (
const struct TALER_PurseContractSignatureP *cpurse_sig,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const json_t *proof);
/**
* Check proof of a purse merge conflict.
*
* @param cmerge_sig conflicting signature (must
* not match the signature from the proof)
* @param merge_pub the public key (must match
* the signature from the proof)
* @param purse_pub the public key of the purse
* @param exchange_url the base URL of this exchange
* @param proof the proof to check
* @return #GNUNET_OK if the @a proof is OK for @a purse_pub and @a merge_pub and conflicts with @a cmerge_sig
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_purse_merge_conflict_ (
const struct TALER_PurseMergeSignatureP *cmerge_sig,
const struct TALER_PurseMergePublicKeyP *merge_pub,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const char *exchange_url,
const json_t *proof);
/**
* Check @a proof that claims this coin was spend
* differently on the same purse already. Note that
* the caller must still check that @a coin_pub is
* in the list of coins that were used, and that
* @a coin_sig is different from the signature the
* caller used.
*
* @param purse_pub the public key of the purse
* @param exchange_url base URL of our exchange
* @param proof the proof to check
* @param[out] h_denom_pub hash of the coin's denomination
* @param[out] phac age commitment hash of the coin
* @param[out] coin_pub set to the conflicting coin
* @param[out] coin_sig set to the conflicting signature
* @return #GNUNET_OK if the @a proof is OK for @a purse_pub and showing that @a coin_pub was spent using @a coin_sig.
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_purse_coin_conflict_ (
const struct TALER_PurseContractPublicKeyP *purse_pub,
const char *exchange_url,
const json_t *proof,
struct TALER_DenominationHashP *h_denom_pub,
struct TALER_AgeCommitmentHash *phac,
struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_CoinSpendSignatureP *coin_sig);
/**
* Check proof of a contract conflict.
*
* @param ccontract_sig conflicting signature (must
* not match the signature from the proof)
* @param purse_pub public key of the purse
* @param proof the proof to check
* @return #GNUNET_OK if the @a proof is OK for @a purse_pub and conflicts with @a ccontract_sig
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_purse_econtract_conflict_ (
const struct TALER_PurseContractSignatureP *ccontract_sig,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const json_t *proof);
/**
* Check proof of a coin spend value conflict.
*
* @param keys exchange /keys structure
* @param proof the proof to check
* @param[out] coin_pub set to the public key of the
* coin that is claimed to have an insufficient
* balance
* @param[out] remaining set to the remaining balance
* of the coin as provided by the proof
* @return #GNUNET_OK if the @a proof is OK for @a purse_pub demonstrating that @a coin_pub has only @a remaining balance.
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_coin_amount_conflict_ (
const struct TALER_EXCHANGE_Keys *keys,
const json_t *proof,
struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_Amount *remaining);
/**
* Verify that @a proof contains a coin history that demonstrates that @a
* coin_pub was previously used with a denomination key that is different from
* @a ch_denom_pub. Note that the coin history MUST have been checked before
* using #TALER_EXCHANGE_check_coin_amount_conflict_().
*
* @param proof a proof to check
* @param ch_denom_pub hash of the conflicting denomination
* @return #GNUNET_OK if @a ch_denom_pub differs from the
* denomination hash given by the history of the coin
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_check_coin_denomination_conflict_ (
const json_t *proof,
const struct TALER_DenominationHashP *ch_denom_pub);
/**
* Find the smallest denomination amount in @e keys.
*
* @param keys keys to search
* @param[out] min set to the smallest amount
* @return #GNUNET_SYSERR if there are no denominations in @a keys
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_get_min_denomination_ (
const struct TALER_EXCHANGE_Keys *keys,
struct TALER_Amount *min);
/**
* Verify signature information about the deposit.
*
* @param dcd contract details
* @param ech hashed policy (passed to avoid recomputation)
* @param h_wire hashed wire details (passed to avoid recomputation)
* @param cdd coin-specific details
* @param dki denomination of the coin
* @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_verify_deposit_signature_ (
const struct TALER_EXCHANGE_DepositContractDetail *dcd,
const struct TALER_ExtensionPolicyHashP *ech,
const struct TALER_MerchantWireHashP *h_wire,
const struct TALER_EXCHANGE_CoinDepositDetail *cdd,
const struct TALER_EXCHANGE_DenomPublicKey *dki);
#endif
|
