| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: icrypt.h,v 1.4 1998/01/12 16:46:03 mdw Exp $ |
| 4 | * |
| 5 | * Higher level encryption functions |
| 6 | * |
| 7 | * (c) 1998 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 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 |
| 25 | * along with `become'; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: icrypt.h,v $ |
| 32 | * Revision 1.4 1998/01/12 16:46:03 mdw |
| 33 | * Fix copyright date. |
| 34 | * |
| 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 | * |
| 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 |
| 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 | |
| 62 | #ifndef BLOWFISH_H |
| 63 | # include "blowfish.h" |
| 64 | #endif |
| 65 | |
| 66 | #ifndef CONFIG_H |
| 67 | # include "config.h" |
| 68 | #endif |
| 69 | |
| 70 | /*----- Type definitions --------------------------------------------------*/ |
| 71 | |
| 72 | /* --- @icrypt_job@ --- */ |
| 73 | |
| 74 | typedef struct icrypt_job { |
| 75 | blowfish_key k; /* Key for en/decrypting */ |
| 76 | int i; /* Index into the IV buffer */ |
| 77 | unsigned char iv[BLOWFISH_BLKSIZE]; /* IV bytes for encrypting */ |
| 78 | } icrypt_job; |
| 79 | |
| 80 | /*----- Functions provided ------------------------------------------------*/ |
| 81 | |
| 82 | extern void icrypt_init(icrypt_job */*j*/, |
| 83 | unsigned char */*k*/, |
| 84 | size_t /*sz*/, |
| 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 |
| 124 | * @size_t sz@ = size of the key in bytes |
| 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*/, |
| 135 | size_t /*sz*/, |
| 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 |