PostgreSQL Source Code: contrib/pgcrypto/px-hmac.c Source File

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px-hmac.c
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1/*
2 * px-hmac.c
3 * HMAC implementation.
4 *
5 * Copyright (c) 2001 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/px-hmac.c
30 */
31
32#include "postgres.h"
33
34#include "px.h"
35
36 #define HMAC_IPAD 0x36
37 #define HMAC_OPAD 0x5C
38
39static unsigned
40 hmac_result_size(PX_HMAC *h)
41{
42 return px_md_result_size(h->md);
43}
44
45static unsigned
46 hmac_block_size(PX_HMAC *h)
47{
48 return px_md_block_size(h->md);
49}
50
51static void
52 hmac_init(PX_HMAC *h, const uint8 *key, unsigned klen)
53{
54 unsigned bs,
55 i;
56 uint8 *keybuf;
57 PX_MD *md = h->md;
58
59 bs = px_md_block_size(md);
60 keybuf = palloc0(bs);
61
62 if (klen > bs)
63 {
64 px_md_update(md, key, klen);
65 px_md_finish(md, keybuf);
66 px_md_reset(md);
67 }
68 else
69 memcpy(keybuf, key, klen);
70
71 for (i = 0; i < bs; i++)
72 {
73 h->p.ipad[i] = keybuf[i] ^ HMAC_IPAD;
74 h->p.opad[i] = keybuf[i] ^ HMAC_OPAD;
75 }
76
77 px_memset(keybuf, 0, bs);
78 pfree(keybuf);
79
80 px_md_update(md, h->p.ipad, bs);
81}
82
83static void
84 hmac_reset(PX_HMAC *h)
85{
86 PX_MD *md = h->md;
87 unsigned bs = px_md_block_size(md);
88
89 px_md_reset(md);
90 px_md_update(md, h->p.ipad, bs);
91}
92
93static void
94 hmac_update(PX_HMAC *h, const uint8 *data, unsigned dlen)
95{
96 px_md_update(h->md, data, dlen);
97}
98
99static void
100 hmac_finish(PX_HMAC *h, uint8 *dst)
101{
102 PX_MD *md = h->md;
103 unsigned bs,
104 hlen;
105 uint8 *buf;
106
107 bs = px_md_block_size(md);
108 hlen = px_md_result_size(md);
109
110 buf = palloc(hlen);
111
112 px_md_finish(md, buf);
113
114 px_md_reset(md);
115 px_md_update(md, h->p.opad, bs);
116 px_md_update(md, buf, hlen);
117 px_md_finish(md, dst);
118
119 px_memset(buf, 0, hlen);
120 pfree(buf);
121}
122
123static void
124 hmac_free(PX_HMAC *h)
125{
126 unsigned bs;
127
128 bs = px_md_block_size(h->md);
129 px_md_free(h->md);
130
131 px_memset(h->p.ipad, 0, bs);
132 px_memset(h->p.opad, 0, bs);
133 pfree(h->p.ipad);
134 pfree(h->p.opad);
135 pfree(h);
136}
137
138
139/* PUBLIC FUNCTIONS */
140
141int
142 px_find_hmac(const char *name, PX_HMAC **res)
143{
144 int err;
145 PX_MD *md;
146 PX_HMAC *h;
147 unsigned bs;
148
149 err = px_find_digest(name, &md);
150 if (err)
151 return err;
152
153 bs = px_md_block_size(md);
154 if (bs < 2)
155 {
156 px_md_free(md);
157 return PXE_HASH_UNUSABLE_FOR_HMAC;
158 }
159
160 h = palloc(sizeof(*h));
161 h->p.ipad = palloc(bs);
162 h->p.opad = palloc(bs);
163 h->md = md;
164
165 h->result_size = hmac_result_size;
166 h->block_size = hmac_block_size;
167 h->reset = hmac_reset;
168 h->update = hmac_update;
169 h->finish = hmac_finish;
170 h->free = hmac_free;
171 h->init = hmac_init;
172
173 *res = h;
174
175 return 0;
176}
uint8_t uint8
Definition: c.h:536
void err(int eval, const char *fmt,...)
Definition: err.c:43
i
int i
Definition: isn.c:77
void pfree(void *pointer)
Definition: mcxt.c:1594
void * palloc0(Size size)
Definition: mcxt.c:1395
void * palloc(Size size)
Definition: mcxt.c:1365
int px_find_digest(const char *name, PX_MD **res)
Definition: openssl.c:161
const void * data
static char * buf
Definition: pg_test_fsync.c:72
int px_find_hmac(const char *name, PX_HMAC **res)
Definition: px-hmac.c:142
static unsigned hmac_result_size(PX_HMAC *h)
Definition: px-hmac.c:40
#define HMAC_OPAD
Definition: px-hmac.c:37
static void hmac_init(PX_HMAC *h, const uint8 *key, unsigned klen)
Definition: px-hmac.c:52
static void hmac_finish(PX_HMAC *h, uint8 *dst)
Definition: px-hmac.c:100
static void hmac_update(PX_HMAC *h, const uint8 *data, unsigned dlen)
Definition: px-hmac.c:94
static void hmac_free(PX_HMAC *h)
Definition: px-hmac.c:124
static unsigned hmac_block_size(PX_HMAC *h)
Definition: px-hmac.c:46
#define HMAC_IPAD
Definition: px-hmac.c:36
static void hmac_reset(PX_HMAC *h)
Definition: px-hmac.c:84
void px_memset(void *ptr, int c, size_t len)
Definition: px.c:123
#define px_md_finish(md, buf)
Definition: px.h:206
#define px_md_free(md)
Definition: px.h:207
#define PXE_HASH_UNUSABLE_FOR_HMAC
Definition: px.h:55
#define px_md_reset(md)
Definition: px.h:204
#define px_md_update(md, data, dlen)
Definition: px.h:205
#define px_md_result_size(md)
Definition: px.h:202
#define px_md_block_size(md)
Definition: px.h:203
Definition: px.h:108
Definition: px.h:130
PX_MD * md
Definition: px.h:139
unsigned(* block_size)(PX_HMAC *h)
Definition: px.h:132
void(* finish)(PX_HMAC *h, uint8 *dst)
Definition: px.h:135
uint8 * ipad
Definition: px.h:143
struct px_hmac::@9 p
void(* init)(PX_HMAC *h, const uint8 *key, unsigned klen)
Definition: px.h:137
uint8 * opad
Definition: px.h:144
unsigned(* result_size)(PX_HMAC *h)
Definition: px.h:131
void(* update)(PX_HMAC *h, const uint8 *data, unsigned dlen)
Definition: px.h:134
void(* free)(PX_HMAC *h)
Definition: px.h:136
void(* reset)(PX_HMAC *h)
Definition: px.h:133
const char * name

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