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
|
/*
* pgp-mpi.c
* OpenPGP MPI helper functions.
*
* Copyright (c) 2005 Marko Kreen
* 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 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.
*
* contrib/pgcrypto/pgp-mpi.c
*/
#include "postgres.h"
#include "pgp.h"
#include "px.h"
int
pgp_mpi_alloc(int bits, PGP_MPI **mpi)
{
PGP_MPI *n;
int len = (bits + 7) / 8;
if (bits < 0 || bits > 0xFFFF)
{
px_debug("pgp_mpi_alloc: unreasonable request: bits=%d", bits);
return PXE_PGP_CORRUPT_DATA;
}
n = palloc(sizeof(*n) + len);
n->bits = bits;
n->bytes = len;
n->data = (uint8 *) (n) + sizeof(*n);
*mpi = n;
return 0;
}
int
pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
{
int res;
PGP_MPI *n;
res = pgp_mpi_alloc(bits, &n);
if (res < 0)
return res;
memcpy(n->data, data, n->bytes);
*mpi = n;
return 0;
}
int
pgp_mpi_free(PGP_MPI *mpi)
{
if (mpi == NULL)
return 0;
px_memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
pfree(mpi);
return 0;
}
int
pgp_mpi_read(PullFilter *src, PGP_MPI **mpi)
{
int res;
uint8 hdr[2];
int bits;
PGP_MPI *n;
res = pullf_read_fixed(src, 2, hdr);
if (res < 0)
return res;
bits = ((unsigned) hdr[0] << 8) + hdr[1];
res = pgp_mpi_alloc(bits, &n);
if (res < 0)
return res;
res = pullf_read_fixed(src, n->bytes, n->data);
if (res < 0)
pgp_mpi_free(n);
else
*mpi = n;
return res;
}
int
pgp_mpi_write(PushFilter *dst, PGP_MPI *n)
{
int res;
uint8 buf[2];
buf[0] = n->bits >> 8;
buf[1] = n->bits & 0xFF;
res = pushf_write(dst, buf, 2);
if (res >= 0)
res = pushf_write(dst, n->data, n->bytes);
return res;
}
int
pgp_mpi_hash(PX_MD *md, PGP_MPI *n)
{
uint8 buf[2];
buf[0] = n->bits >> 8;
buf[1] = n->bits & 0xFF;
px_md_update(md, buf, 2);
px_md_update(md, n->data, n->bytes);
return 0;
}
unsigned
pgp_mpi_cksum(unsigned cksum, PGP_MPI *n)
{
int i;
cksum += n->bits >> 8;
cksum += n->bits & 0xFF;
for (i = 0; i < n->bytes; i++)
cksum += n->data[i];
return cksum & 0xFFFF;
}
|
