mdw@git.distorted.org.uk Git - become/blob - src/icrypt.h

   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