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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: icrypt.h,v 1.4 1998/01/12 16:46:03 mdw Exp $ |
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4 | * |
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5 | * Higher level encryption functions |
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6 | * |
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7 | * (c) 1998 Mark Wooding |
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8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `Become' 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 General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
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25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: icrypt.h,v $ |
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32 | * Revision 1.4 1998/01/12 16:46:03 mdw |
33 | * Fix copyright date. |
34 | * |
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35 | * Revision 1.3 1997/09/26 09:14:58 mdw |
36 | * Merged blowfish branch into trunk. |
37 | * |
38 | * Revision 1.2.2.1 1997/09/26 09:08:08 mdw |
39 | * Use the Blowfish encryption algorithm instead of IDEA. This is partly |
40 | * because I prefer Blowfish (without any particularly strong evidence) but |
41 | * mainly because IDEA is patented and Blowfish isn't. |
42 | * |
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43 | * Revision 1.2 1997/08/04 10:24:22 mdw |
44 | * Sources placed under CVS control. |
45 | * |
46 | * Revision 1.1 1997/07/21 13:47:49 mdw |
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47 | * Initial revision |
48 | * |
49 | */ |
50 | |
51 | #ifndef ICRYPT_H |
52 | #define ICRYPT_H |
53 | |
54 | #ifdef __cplusplus |
55 | extern "C" { |
56 | #endif |
57 | |
58 | /*----- Required headers --------------------------------------------------*/ |
59 | |
60 | #include <stddef.h> |
61 | |
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62 | #ifndef BLOWFISH_H |
63 | # include "blowfish.h" |
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64 | #endif |
65 | |
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66 | #ifndef CONFIG_H |
67 | # include "config.h" |
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68 | #endif |
69 | |
70 | /*----- Type definitions --------------------------------------------------*/ |
71 | |
72 | /* --- @icrypt_job@ --- */ |
73 | |
74 | typedef struct icrypt_job { |
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75 | blowfish_key k; /* Key for en/decrypting */ |
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76 | int i; /* Index into the IV buffer */ |
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77 | unsigned char iv[BLOWFISH_BLKSIZE]; /* IV bytes for encrypting */ |
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78 | } icrypt_job; |
79 | |
80 | /*----- Functions provided ------------------------------------------------*/ |
81 | |
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82 | extern void icrypt_init(icrypt_job */*j*/, |
83 | unsigned char */*k*/, |
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84 | size_t /*sz*/, |
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85 | const unsigned char */*iv*/); |
86 | |
87 | /* --- @icrypt_encrypt@ --- * |
88 | * |
89 | * Arguments: @icrypt_job *j@ = job handle |
90 | * @const void *src@ = pointer to source buffer |
91 | * @void *dest@ = pointer to destination buffer |
92 | * @size_t sz@ = size of buffers to handle |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: Encrypts data from the source to the destination, using the |
97 | * key attached to the job handle. |
98 | */ |
99 | |
100 | extern void icrypt_encrypt(icrypt_job */*j*/, const void */*src*/, |
101 | void */*dest*/, size_t /*sz*/); |
102 | |
103 | /* --- @icrypt_decrypt@ --- * |
104 | * |
105 | * Arguments: @icrypt_job *j@ = job handle |
106 | * @const void *src@ = pointer to source buffer |
107 | * @void *dest@ = pointer to destination buffer |
108 | * @size_t sz@ = size of buffers to handle |
109 | * |
110 | * Returns: --- |
111 | * |
112 | * Use: Decrypts data from the source to the destination, using |
113 | * the key attached to the job handle. |
114 | */ |
115 | |
116 | extern void icrypt_decrypt(icrypt_job */*j*/, const void */*src*/, |
117 | void */*dest*/, size_t /*sz*/); |
118 | |
119 | /* --- @icrypt_reset@ --- * |
120 | * |
121 | * Arguments: @icrypt_job *j@ = pointer to job context block |
122 | * @unsigned char *k@ = pointer to key data, or zero for |
123 | * no change |
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124 | * @size_t sz@ = size of the key in bytes |
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125 | * @const unsigned char *iv@ = pointer to IV, or zero |
126 | * |
127 | * Returns: --- |
128 | * |
129 | * Use: Alters the context block. This can be used after recovery |
130 | * of a session key, for example. |
131 | */ |
132 | |
133 | extern void icrypt_reset(icrypt_job */*j*/, |
134 | unsigned char */*k*/, |
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135 | size_t /*sz*/, |
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136 | const unsigned char */*iv*/); |
137 | |
138 | /* --- @icrypt_saveIV@ --- * |
139 | * |
140 | * Arguments: @icrypt_job *j@ = pointer to job context block |
141 | * @unsigned char *iv@ = where to store the IV |
142 | * |
143 | * Returns: --- |
144 | * |
145 | * Use: Writes out the job's IV after munging it a little. |
146 | */ |
147 | |
148 | extern void icrypt_saveIV(icrypt_job */*j*/, unsigned char */*iv*/); |
149 | |
150 | /*----- That's all, folks -------------------------------------------------*/ |
151 | |
152 | #ifdef __cplusplus |
153 | } |
154 | #endif |
155 | |
156 | #endif |