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