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
|
/*
* Copyright (c) 2017-2021 Ribose Inc.
* Copyright (c) 2012 Alistair Crooks <agc@NetBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "bn.h"
#include <botan/ffi.h>
#include <stdlib.h>
#include <assert.h>
#include "utils.h"
/* essentiually, these are just wrappers around the botan functions */
/* usually the order of args changes */
/* the bignum_t API tends to have more const poisoning */
/* these wrappers also check the arguments passed for sanity */
/* store in unsigned [big endian] format */
int
bn_bn2bin(const bignum_t *a, unsigned char *b)
{
if (!a || !b) {
return -1;
}
return botan_mp_to_bin(a->mp, b);
}
bignum_t *
mpi2bn(const pgp_mpi_t *val)
{
assert(val);
if (!val) {
RNP_LOG("NULL val.");
return NULL;
}
bignum_t *res = bn_new();
if (!res) {
return NULL;
}
if (botan_mp_from_bin(res->mp, val->mpi, val->len)) {
bn_free(res);
res = NULL;
}
return res;
}
bool
bn2mpi(const bignum_t *bn, pgp_mpi_t *val)
{
val->len = bn_num_bytes(*bn);
if (val->len > PGP_MPINT_SIZE) {
RNP_LOG("Too large MPI.");
val->len = 0;
return false;
}
return bn_bn2bin(bn, val->mpi) == 0;
}
bignum_t *
bn_new(void)
{
bignum_t *a = (bignum_t *) calloc(1, sizeof(*a));
if (!a) {
return NULL;
}
botan_mp_init(&a->mp);
return a;
}
void
bn_free(bignum_t *a)
{
if (a) {
botan_mp_destroy(a->mp);
free(a);
}
}
size_t
bn_num_bytes(const bignum_t &a)
{
size_t bytes = 0;
if (botan_mp_num_bits(a.mp, &bytes)) {
RNP_LOG("botan_mp_num_bits failed.");
}
return BITS_TO_BYTES(bytes);
}
|
