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
|
/* Copyright (C) 2018 vt@altlinux.org
* Copyright (C) 2018 Björn Esser besser82@fedoraproject.org
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "crypt-port.h"
#if INCLUDE_gost_yescrypt
#define YESCRYPT_INTERNAL
#include "alg-yescrypt.h"
#undef YESCRYPT_INTERNAL
#include "alg-gost3411-2012-hmac.h"
#include <errno.h>
/* upper level hmac for tests */
#ifndef outer_gost_hmac256
#define outer_gost_hmac256 gost_hmac256
#endif
/* For use in scratch space by crypt_gost_yescrypt_rn(). */
typedef struct
{
yescrypt_local_t local;
gost_hmac_256_t gostbuf;
uint8_t outbuf[CRYPT_OUTPUT_SIZE];
uint8_t gsetting[CRYPT_OUTPUT_SIZE];
uint8_t hk[32], interm[32], y[32];
uint8_t *retval;
} crypt_gost_yescrypt_internal_t;
static_assert (sizeof (crypt_gost_yescrypt_internal_t) <= ALG_SPECIFIC_SIZE,
"ALG_SPECIFIC_SIZE is too small for GOST-YESCRYPT.");
/*
* As OUTPUT is initialized with a failure token before gensalt_yescrypt_rn
* is called, in case of an error we could just set an appropriate errno
* and return.
*/
void
gensalt_gost_yescrypt_rn (unsigned long count,
const uint8_t *rbytes, size_t nrbytes,
uint8_t *output, size_t o_size)
{
if (o_size < 4 + 8 * 6 + BASE64_LEN (nrbytes) + 1 ||
CRYPT_GENSALT_OUTPUT_SIZE < 4 + 8 * 6 + BASE64_LEN (nrbytes) + 1)
{
errno = ERANGE;
return;
}
/* We pass 'o_size - 1' to gensalt, because we need to shift
the prefix by 1 char to insert the gost marker. */
gensalt_yescrypt_rn (count, rbytes, nrbytes, output, o_size - 1);
/* Check for failures. */
if (output[0] == '*')
return;
/* Shift output one byte further. */
memmove (output + 1, output, strlen ((const char *) output) + 1);
/* Insert the gost marker. */
output[1] = 'g';
}
void
crypt_gost_yescrypt_rn (const char *phrase, size_t phr_size,
const char *setting, size_t set_size,
uint8_t *output, size_t o_size,
void *scratch, size_t s_size)
{
if (o_size < set_size + 1 + 43 + 1 ||
CRYPT_OUTPUT_SIZE < set_size + 1 + 43 + 1 ||
s_size < sizeof (crypt_gost_yescrypt_internal_t))
{
errno = ERANGE;
return;
}
/* Fail when called with wrong prefix. */
if (strncmp (setting, "$gy$", 4))
{
errno = EINVAL;
return;
}
crypt_gost_yescrypt_internal_t *intbuf = scratch;
if (yescrypt_init_local (&intbuf->local))
return;
/* convert gost setting to yescrypt setting */
intbuf->gsetting[0] = '$';
intbuf->gsetting[1] = 'y';
intbuf->gsetting[2] = '$';
XCRYPT_STRCPY_OR_ABORT (&intbuf->gsetting[3], set_size - 3, setting + 4);
intbuf->retval = yescrypt_r (NULL, &intbuf->local,
(const uint8_t *) phrase, phr_size,
intbuf->gsetting, NULL,
intbuf->outbuf + 1, o_size - 1);
if (!intbuf->retval)
errno = EINVAL;
if (yescrypt_free_local (&intbuf->local) || !intbuf->retval)
return;
intbuf->outbuf[0] = '$';
intbuf->outbuf[1] = 'g';
/* extract yescrypt output from "$y$param$salt$output" */
char *hptr = strchr ((const char *) intbuf->retval + 3, '$');
if (!hptr)
{
errno = EINVAL;
return;
}
hptr = strchr (hptr + 1, '$');
if (!hptr)
{
errno = EINVAL;
return;
}
hptr++; /* start of output */
/* decode yescrypt output into its raw 256-bit form */
size_t ylen = sizeof (intbuf->y);
if (!decode64 (intbuf->y, &ylen, (uint8_t *) hptr, strlen (hptr)) ||
ylen != sizeof (intbuf->y))
{
errno = EINVAL;
return;
}
/*
* HMAC_GOSTR3411_2012_256(
* HMAC_GOSTR3411_2012_256(GOST2012_256(K), S),
* yescrypt(K, S)
* )
* yescrypt output is used in place of message,
* thus, its crypto properties are superseded by GOST.
* Password is always hashed for inner hmac to avoid
* collisions between hashed and unhashed passwords.
*/
gost_hash256 ((const uint8_t *) phrase, phr_size, intbuf->hk, &intbuf->gostbuf.ctx);
gost_hmac256 (intbuf->hk, sizeof (intbuf->hk),
(const uint8_t *) setting,
(size_t) ((uint8_t *) hptr - intbuf->retval),
intbuf->interm, &intbuf->gostbuf);
outer_gost_hmac256 (intbuf->interm, sizeof (intbuf->interm),
intbuf->y, sizeof (intbuf->y), intbuf->y, &intbuf->gostbuf);
encode64 ((uint8_t *) hptr, o_size - (size_t) ((uint8_t *) hptr - intbuf->retval),
intbuf->y, sizeof (intbuf->y));
XCRYPT_STRCPY_OR_ABORT (output, o_size, intbuf->outbuf);
return;
}
#endif /* INCLUDE_gost_yescrypt */
|
