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
|
/*
This file is part of TALER
Copyright (C) 2018 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 util/crypto_wire.c
* @brief functions for making and verifying /wire account signatures
* @author Christian Grothoff <christian@grothoff.org>
*/
#include "platform.h"
#include "taler_crypto_lib.h"
#include "taler_signatures.h"
/**
* Compute the hash of the given wire details. The resulting
* hash is what is put into the contract.
*
* @param payto_url bank account
* @param[out] hc set to the hash
*/
void
TALER_exchange_wire_signature_hash (const char *payto_url,
struct GNUNET_HashCode *hc)
{
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (hc,
sizeof (*hc),
payto_url,
strlen (payto_url) + 1,
"exchange-wire-signature",
strlen ("exchange-wire-signature"),
NULL, 0));
}
/**
* Check the signature in @a wire_s.
*
* @param payto_url URL that is signed
* @param master_pub master public key of the exchange
* @param master_sig signature of the exchange
* @return #GNUNET_OK if signature is valid
*/
int
TALER_exchange_wire_signature_check (const char *payto_url,
const struct
TALER_MasterPublicKeyP *master_pub,
const struct
TALER_MasterSignatureP *master_sig)
{
struct TALER_MasterWireDetailsPS wd;
wd.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_WIRE_DETAILS);
wd.purpose.size = htonl (sizeof (wd));
TALER_exchange_wire_signature_hash (payto_url,
&wd.h_wire_details);
return GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_WIRE_DETAILS,
&wd.purpose,
&master_sig->eddsa_signature,
&master_pub->eddsa_pub);
}
/**
* Create a signed wire statement for the given account.
*
* @param payto_url account specification
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_wire_signature_make (const char *payto_url,
const struct
TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig)
{
struct TALER_MasterWireDetailsPS wd;
wd.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_WIRE_DETAILS);
wd.purpose.size = htonl (sizeof (wd));
TALER_exchange_wire_signature_hash (payto_url,
&wd.h_wire_details);
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_eddsa_sign (&master_priv->eddsa_priv,
&wd.purpose,
&master_sig->eddsa_signature));
}
/**
* Compute the hash of the given wire details. The resulting
* hash is what is put into the contract.
*
* @param payto_url bank account
* @param salt salt used to eliminate brute-force inversion
* @param[out] hc set to the hash
*/
void
TALER_merchant_wire_signature_hash (const char *payto_url,
const char *salt,
struct GNUNET_HashCode *hc)
{
GNUNET_assert (GNUNET_YES ==
GNUNET_CRYPTO_kdf (hc,
sizeof (*hc),
salt,
strlen (salt) + 1,
payto_url,
strlen (payto_url) + 1,
"merchant-wire-signature",
strlen ("merchant-wire-signature"),
NULL, 0));
}
/**
* Check the signature in @a merch_sig. (Not yet used anywhere.)
*
* @param payto_url URL that is signed
* @param salt the salt used to salt the @a payto_url when hashing
* @param merch_pub master public key of the merchant
* @param merch_sig signature of the merchant
* @return #GNUNET_OK if signature is valid
*/
int
TALER_merchant_wire_signature_check (const char *payto_url,
const char *salt,
const struct
TALER_MerchantPublicKeyP *merch_pub,
const struct
TALER_MerchantSignatureP *merch_sig)
{
struct TALER_MasterWireDetailsPS wd;
wd.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS);
wd.purpose.size = htonl (sizeof (wd));
TALER_merchant_wire_signature_hash (payto_url,
salt,
&wd.h_wire_details);
return GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS,
&wd.purpose,
&merch_sig->eddsa_sig,
&merch_pub->eddsa_pub);
}
/**
* Create a signed wire statement for the given account. (Not yet used anywhere.)
*
* @param payto_url account specification
* @param salt the salt used to salt the @a payto_url when hashing
* @param merch_priv private key to sign with
* @param[out] merch_sig where to write the signature
*/
void
TALER_merchant_wire_signature_make (const char *payto_url,
const char *salt,
const struct
TALER_MerchantPrivateKeyP *merch_priv,
struct TALER_MerchantSignatureP *merch_sig)
{
struct TALER_MasterWireDetailsPS wd;
wd.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_WIRE_DETAILS);
wd.purpose.size = htonl (sizeof (wd));
TALER_merchant_wire_signature_hash (payto_url,
salt,
&wd.h_wire_details);
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_eddsa_sign (&merch_priv->eddsa_priv,
&wd.purpose,
&merch_sig->eddsa_sig));
}
/* end of crypto_wire.c */
|
