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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/* $Id: prf.c,v 1.1 1998/11/15 00:03:49 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include "hash.h"
#include "log.h"
#include "prf.h"
void prf_hash_init (struct prf_hash_ctx *);
void prf_hash_update (struct prf_hash_ctx *, unsigned char *, unsigned int);
void prf_hash_final (unsigned char *, struct prf_hash_ctx *);
/* PRF behaves likes a hash */
void
prf_hash_init (struct prf_hash_ctx *ctx)
{
memcpy (ctx->hash->ctx, ctx->ctx, ctx->hash->ctxsize);
memcpy (ctx->hash->ctx2, ctx->ctx2, ctx->hash->ctxsize);
}
void
prf_hash_update (struct prf_hash_ctx *ctx, unsigned char *data,
unsigned int len)
{
ctx->hash->Update (ctx->hash->ctx, data, len);
}
void
prf_hash_final (unsigned char *digest, struct prf_hash_ctx *ctx)
{
ctx->hash->HMACFinal (digest, ctx->hash);
}
/*
* Obtain a Pseudo-Random Function for us. At the moment this is
* the HMAC version of a hash. See RFC-2104 for reference.
*/
struct prf *
prf_alloc (enum prfs type, int subtype, char *shared, int sharedsize)
{
struct hash *hash;
struct prf *prf;
switch (type)
{
case PRF_HMAC:
hash = hash_get (subtype);
if (hash == NULL)
return NULL;
break;
default:
log_print ("Unkown PRF type %d in prf_alloc()", type);
return NULL;
}
if ((prf = malloc (sizeof (struct prf))) == NULL)
{
log_print ("Out of memory for struct prf in prf_alloc()");
return NULL;
}
if (type == PRF_HMAC)
{
struct prf_hash_ctx *prfctx;
/* Obtain needed memory */
prfctx = malloc (sizeof (struct prf_hash_ctx));
if (prfctx == NULL)
{
log_print ("Out of memory for struct prf_hash_ctx in prf_alloc()");
goto cleanprf;
}
prf->prfctx = prfctx;
prfctx->ctx = malloc (hash->ctxsize);
if (prfctx->ctx == NULL)
{
log_print ("Out of memory for ctx in prf_alloc()");
goto cleanprfctx;
}
prfctx->ctx2 = malloc (hash->ctxsize);
if (prfctx->ctx2 == NULL)
{
log_print ("Out of memory for ctx2 in prf_alloc()");
free (prfctx->ctx);
goto cleanprfctx;
}
prf->type = PRF_HMAC;
prf->blocksize = hash->hashsize;
prfctx->hash = hash;
/* Use the correct function pointers */
prf->Init = (void (*) (void *)) prf_hash_init;
prf->Update
= (void (*) (void *, unsigned char *, unsigned int)) prf_hash_update;
prf->Final = (void (*) (unsigned char *, void *)) prf_hash_final;
/* Init HMAC contexts */
hash->HMACInit (hash, shared, sharedsize);
/* Save contexts */
memcpy (prfctx->ctx, hash->ctx, hash->ctxsize);
memcpy (prfctx->ctx2, hash->ctx2, hash->ctxsize);
}
return prf;
cleanprfctx:
free (prf->prfctx);
cleanprf:
free (prf);
return NULL;
}
void
prf_free (struct prf *prf)
{
if (prf->type == PRF_HMAC)
{
struct prf_hash_ctx *prfctx = prf->prfctx;
free (prfctx->ctx2);
free (prfctx->ctx);
}
free (prf->prfctx);
free (prf);
}
|
