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
|
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "dcrypto.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <openssl/bn.h>
static int test_bn_modinv_helper(const BIGNUM *E, BN_CTX *ctx)
{
int i;
BIGNUM *MOD = BN_CTX_get(ctx);
for (i = 0; i < 1000; i++) {
uint32_t m_buf[64];
uint32_t d_buf[64];
uint32_t e_buf[32];
int has_inverse;
int test_inverse;
struct LITE_BIGNUM m;
struct LITE_BIGNUM e;
struct LITE_BIGNUM d;
BIGNUM *r = BN_CTX_get(ctx);
memset(e_buf, 0, sizeof(e_buf));
/* Top bit set, bottom bit clear. */
BN_rand(MOD, 2048, 1, 0);
if (BN_mod_inverse(r, E, MOD, ctx))
has_inverse = 1;
else
has_inverse = 0;
DCRYPTO_bn_wrap(&m, m_buf, sizeof(m_buf));
memcpy(m_buf, MOD->d, sizeof(m_buf));
assert(BN_num_bytes(E) <= sizeof(e_buf));
memcpy(e_buf, E->d, BN_num_bytes(E));
DCRYPTO_bn_wrap(&e, e_buf, sizeof(e_buf));
bn_init(&d, d_buf, sizeof(d_buf));
test_inverse = bn_modinv_vartime(&d, &e, &m);
if (test_inverse != has_inverse) {
fprintf(stderr,
"ossl inverse: %d, dcrypto inverse: %d\n",
has_inverse, test_inverse);
fprintf(stderr, "d : ");
BN_print_fp(stderr, r);
fprintf(stderr, "\n");
fprintf(stderr, "e : ");
BN_print_fp(stderr, E);
fprintf(stderr, "\n");
fprintf(stderr, "M : ");
BN_print_fp(stderr, MOD);
fprintf(stderr, "\n");
return 1;
}
if (has_inverse) {
if (memcmp(d.d, r->d, BN_num_bytes(r)) != 0) {
fprintf(stderr, "memcmp fail\n");
return 1;
}
}
BN_free(r);
}
return 0;
}
static int test_bn_modinv(void)
{
int result = 1;
BN_CTX *ctx = BN_CTX_new();
BN_CTX_start(ctx);
BIGNUM *E = BN_CTX_get(ctx);
BN_rand(E, 1024, 1, 1);
if (test_bn_modinv_helper(E, ctx))
goto fail;
BN_rand(E, 1024, 1, 0);
if (test_bn_modinv_helper(E, ctx))
goto fail;
BN_set_word(E, 3);
if (test_bn_modinv_helper(E, ctx))
goto fail;
BN_set_word(E, 65537);
if (test_bn_modinv_helper(E, ctx))
goto fail;
result = 0;
fail:
BN_CTX_end(ctx);
BN_CTX_free(ctx);
return result;
}
void *always_memset(void *s, int c, size_t n)
{
memset(s, c, n);
return s;
}
void watchdog_reload(void)
{
}
int main(void)
{
assert(test_bn_modinv() == 0);
fprintf(stderr, "PASS\n");
return 0;
}
|
