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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
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_refresh_common.h
* @brief shared (serialization) logic for refresh protocol
* @author Christian Grothoff
*/
#ifndef REFRESH_COMMON_H
#define REFRESH_COMMON_H
#include <jansson.h>
#include "taler_json_lib.h"
#include "taler_exchange_service.h"
#include "taler_signatures.h"
/**
* Information about a coin we are melting.
*/
struct MeltedCoin
{
/**
* Private key of the coin.
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
/**
* Amount this coin contributes to the melt, including fee.
*/
struct TALER_Amount melt_amount_with_fee;
/**
* The applicable fee for melting a coin of this denomination
*/
struct TALER_Amount fee_melt;
/**
* The original value of the coin.
*/
struct TALER_Amount original_value;
/**
* The original age commitment, its proof and its hash. MUST be NULL if no
* age commitment was set.
*/
const struct TALER_AgeCommitmentProof *age_commitment_proof;
const struct TALER_AgeCommitmentHash *h_age_commitment;
/**
* Timestamp indicating when coins of this denomination become invalid.
*/
struct GNUNET_TIME_Timestamp expire_deposit;
/**
* Denomination key of the original coin.
*/
struct TALER_DenominationPublicKey pub_key;
/**
* Exchange's signature over the coin.
*/
struct TALER_DenominationSignature sig;
};
/**
* Data we keep for each fresh coin created in the
* melt process.
*/
struct FreshCoinData
{
/**
* Denomination public key of the coin.
*/
struct TALER_DenominationPublicKey fresh_pk;
/**
* Array of planchet secrets for the coins, depending
* on the cut-and-choose.
*/
struct TALER_PlanchetMasterSecretP ps[TALER_CNC_KAPPA];
/**
* Private key of the coin.
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
/**
* Arrays of age commitments and proofs to be created, one for each
* cut-and-choose dimension. The entries in each list might be NULL and
* indicate no age commitment/restriction on the particular coin.
*/
struct TALER_AgeCommitmentProof *age_commitment_proof[TALER_CNC_KAPPA];
/**
* Blinding key secrets for the coins, depending on the
* cut-and-choose.
*/
union TALER_DenominationBlindingKeyP bks[TALER_CNC_KAPPA];
};
/**
* Melt data in non-serialized format for convenient processing.
*/
struct MeltData
{
/**
* Hash over the committed data during refresh operation.
*/
struct TALER_RefreshCommitmentP rc;
/**
* Information about the melted coin.
*/
struct MeltedCoin melted_coin;
/**
* Array of length @e num_fresh_coins with information
* about each fresh coin.
*/
struct FreshCoinData *fcds;
/**
* Transfer secrets, one per cut and choose.
*/
struct TALER_TransferSecretP trans_sec[TALER_CNC_KAPPA];
/**
* Transfer private keys for each cut-and-choose dimension.
*/
struct TALER_TransferPrivateKeyP transfer_priv[TALER_CNC_KAPPA];
/**
* Transfer public key of this commitment.
*/
struct TALER_TransferPublicKeyP transfer_pub[TALER_CNC_KAPPA];
/**
* Transfer secrets, one per cut and choose.
*/
struct TALER_RefreshCommitmentEntry rce[TALER_CNC_KAPPA];
/**
* Blinded planchets and denominations of the fresh coins, depending on the cut-and-choose. Array of length
* @e num_fresh_coins.
*/
struct TALER_RefreshCoinData *rcd[TALER_CNC_KAPPA];
/**
* Number of coins we are creating
*/
uint16_t num_fresh_coins;
};
/**
* Compute the melt data from the refresh data and secret.
*
* @param rms secret internals of the refresh-reveal operation
* @param rd refresh data with the characteristics of the operation
* @param alg_values contributions from the exchange into the melt
* @param[out] md where to write the derived melt data
*/
enum GNUNET_GenericReturnValue
TALER_EXCHANGE_get_melt_data_ (
const struct TALER_RefreshMasterSecretP *rms,
const struct TALER_EXCHANGE_RefreshData *rd,
const struct TALER_ExchangeWithdrawValues *alg_values,
struct MeltData *md);
/**
* Free all information associated with a melting session. Note
* that we allow the melting session to be only partially initialized,
* as we use this function also when freeing melt data that was not
* fully initialized.
*
* @param[in] md melting data to release, the pointer itself is NOT
* freed (as it is typically not allocated by itself)
*/
void
TALER_EXCHANGE_free_melt_data_ (struct MeltData *md);
#endif
|
