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pgp-mpi.c
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1 /*
2  * pgp-mpi.c
3  * OpenPGP MPI helper functions.
4  *
5  * Copyright (c) 2005 Marko Kreen
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * contrib/pgcrypto/pgp-mpi.c
30  */
31 #include "postgres.h"
32 
33 #include "px.h"
34 #include "pgp.h"
35 
36 int
37 pgp_mpi_alloc(int bits, PGP_MPI **mpi)
38 {
39  PGP_MPI *n;
40  int len = (bits + 7) / 8;
41 
42  if (bits < 0 || bits > 0xFFFF)
43  {
44  px_debug("pgp_mpi_alloc: unreasonable request: bits=%d", bits);
45  return PXE_PGP_CORRUPT_DATA;
46  }
47  n = px_alloc(sizeof(*n) + len);
48  n->bits = bits;
49  n->bytes = len;
50  n->data = (uint8 *) (n) + sizeof(*n);
51  *mpi = n;
52  return 0;
53 }
54 
55 int
56 pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
57 {
58  int res;
59  PGP_MPI *n;
60 
61  res = pgp_mpi_alloc(bits, &n);
62  if (res < 0)
63  return res;
64  memcpy(n->data, data, n->bytes);
65  *mpi = n;
66  return 0;
67 }
68 
69 int
71 {
72  if (mpi == NULL)
73  return 0;
74  px_memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
75  px_free(mpi);
76  return 0;
77 }
78 
79 int
81 {
82  int res;
83  uint8 hdr[2];
84  int bits;
85  PGP_MPI *n;
86 
87  res = pullf_read_fixed(src, 2, hdr);
88  if (res < 0)
89  return res;
90  bits = ((unsigned) hdr[0] << 8) + hdr[1];
91 
92  res = pgp_mpi_alloc(bits, &n);
93  if (res < 0)
94  return res;
95 
96  res = pullf_read_fixed(src, n->bytes, n->data);
97  if (res < 0)
98  pgp_mpi_free(n);
99  else
100  *mpi = n;
101  return res;
102 }
103 
104 int
106 {
107  int res;
108  uint8 buf[2];
109 
110  buf[0] = n->bits >> 8;
111  buf[1] = n->bits & 0xFF;
112  res = pushf_write(dst, buf, 2);
113  if (res >= 0)
114  res = pushf_write(dst, n->data, n->bytes);
115  return res;
116 }
117 
118 int
120 {
121  uint8 buf[2];
122 
123  buf[0] = n->bits >> 8;
124  buf[1] = n->bits & 0xFF;
125  px_md_update(md, buf, 2);
126  px_md_update(md, n->data, n->bytes);
127 
128  return 0;
129 }
130 
131 unsigned
132 pgp_mpi_cksum(unsigned cksum, PGP_MPI *n)
133 {
134  int i;
135 
136  cksum += n->bits >> 8;
137  cksum += n->bits & 0xFF;
138  for (i = 0; i < n->bytes; i++)
139  cksum += n->data[i];
140 
141  return cksum & 0xFFFF;
142 }
unsigned pgp_mpi_cksum(unsigned cksum, PGP_MPI *n)
Definition: pgp-mpi.c:132
int pgp_mpi_hash(PX_MD *md, PGP_MPI *n)
Definition: pgp-mpi.c:119
#define PXE_PGP_CORRUPT_DATA
Definition: px.h:81
uint8 * data
Definition: pgp.h:181
int pullf_read_fixed(PullFilter *src, int len, uint8 *dst)
Definition: mbuf.c:317
#define px_free(p)
Definition: px.h:46
#define px_md_update(md, data, dlen)
Definition: px.h:208
unsigned char uint8
Definition: c.h:266
int pgp_mpi_write(PushFilter *dst, PGP_MPI *n)
Definition: pgp-mpi.c:105
int bytes
Definition: pgp.h:183
Definition: px.h:113
int pgp_mpi_alloc(int bits, PGP_MPI **mpi)
Definition: pgp-mpi.c:37
static char * buf
Definition: pg_test_fsync.c:66
Definition: pgp.h:179
int pgp_mpi_read(PullFilter *src, PGP_MPI **mpi)
Definition: pgp-mpi.c:80
int pgp_mpi_free(PGP_MPI *mpi)
Definition: pgp-mpi.c:70
#define NULL
Definition: c.h:229
void px_debug(const char *fmt,...)
Definition: px.c:160
#define px_alloc(s)
Definition: px.h:44
int i
int pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
Definition: pgp-mpi.c:56
int pushf_write(PushFilter *mp, const uint8 *data, int len)
Definition: mbuf.c:456
void px_memset(void *ptr, int c, size_t len)
Definition: px.c:134
int bits
Definition: pgp.h:182