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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: sslprf.h,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The SSL pseudo-random function |
6 | * |
7 | * (c) 2001 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | #ifndef CATACOMB_SSLPRF_H |
31 | #define CATACOMB_SSLPRF_H |
32 | |
33 | #ifdef __cplusplus |
34 | extern "C" { |
35 | #endif |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #ifndef CATACOMB_GMAC_H |
40 | # include "gmac.h" |
41 | #endif |
42 | |
43 | #ifndef CATACOMB_GRAND_H |
44 | # include "grand.h" |
45 | #endif |
46 | |
47 | /*----- Data structures ---------------------------------------------------*/ |
48 | |
49 | typedef struct sslprf_ctx { |
50 | const gchash *co, *ci; /* Outer and inner hash functions */ |
51 | size_t ohashsz, ihashsz; /* Size of the hash outputs */ |
52 | ghash *h; /* Hash context from last time */ |
53 | const octet *k; /* Pointer to the secret */ |
54 | size_t ksz; /* Size of the secret buffer */ |
55 | const octet *sd; /* Pointer to the seed */ |
56 | size_t sdsz; /* Size of the seed buffer */ |
57 | unsigned i; /* Which iteration this is */ |
58 | octet *p; /* Pointer to output buffer */ |
59 | size_t sz; /* How many bytes are left */ |
60 | } sslprf_ctx; |
61 | |
62 | /*----- Functions provided ------------------------------------------------*/ |
63 | |
64 | /* --- @sslprf_init@ --- * |
65 | * |
66 | * Arguments: @sslprf_ctx *c@ = pointer to a context structure |
67 | * @const gchash *hco, *hci@ = outer and inner hash functions |
68 | * @const void *k@ = pointer to secret buffer |
69 | * @size_t ksz@ = size of the secret |
70 | * @const void *sd@ = pointer to seed buffer |
71 | * @size_t sdsz@ = size of the seed |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Initializes an SSL generator context. |
76 | */ |
77 | |
78 | extern void sslprf_init(sslprf_ctx */*c*/, |
79 | const gchash */*hco*/, const gchash */*hci*/, |
80 | const void */*k*/, size_t /*ksz*/, |
81 | const void */*sd*/, size_t /*sdsz*/); |
82 | |
83 | /* --- @sslprf_encrypt@ --- * |
84 | * |
85 | * Arguments: @sslprf_ctx *c@ = pointer to a context structure |
86 | * @const void *src@ = pointer to source buffer |
87 | * @void *dest@ = pointer to destination buffer |
88 | * @size_t sz@ = size of the buffers |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Encrypts data using the SSL pseudo-random function. If the |
93 | * destination pointer is null, the generator is spun and no |
94 | * output is produced; if the source pointer is null, raw output |
95 | * from the generator is written; otherwise, the source data is |
96 | * XORed with the generator output. |
97 | */ |
98 | |
99 | extern void sslprf_encrypt(sslprf_ctx */*c*/, |
100 | const void */*src*/, void */*dest*/, |
101 | size_t /*sz*/); |
102 | |
103 | /* --- @sslprf_free@ --- * |
104 | * |
105 | * Arguments: @sslprf_ctx@ = pointer to a context |
106 | * |
107 | * Returns: --- |
108 | * |
109 | * Use: Frees resources held in an SSL generator context. |
110 | */ |
111 | |
112 | extern void sslprf_free(sslprf_ctx */*c*/); |
113 | |
114 | /* ---@sslprf_rand@ --- * |
115 | * |
116 | * Arguments: @const gchash *hco, const gchash *hci@ = hash functions |
117 | * @const void *k@ = pointer to the key material |
118 | * @size_t ksz@ = size of the key material |
119 | * @const void *sd@ = pointer to the seed material |
120 | * @size_t sdsz@ = size of the seed material |
121 | * |
122 | * Returns: Pointer to generic random number generator interface. |
123 | * |
124 | * Use: Creates a generic generator which does TLS data expansion. |
125 | */ |
126 | |
127 | extern grand *sslprf_rand(const gchash */*hco*/, const gchash */*hci*/, |
128 | const void */*k*/, size_t /*ksz*/, |
129 | const void */*sd*/, size_t /*sdsz*/); |
130 | |
131 | /*----- That's all, folks -------------------------------------------------*/ |
132 | |
133 | #ifdef __cplusplus |
134 | } |
135 | #endif |
136 | |
137 | #endif |