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

   1 /* -*-c-*-
   2  *
   3  * $Id: icrypt.h,v 1.2 1997/08/04 10:24:22 mdw Exp $
   4  *
   5  * Higher level IDEA encryption
   6  *
   7  * (c) 1997 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 1.2  1997/08/04 10:24:22  mdw
  33  * Sources placed under CVS control.
  34  *
  35  * Revision 1.1  1997/07/21  13:47:49  mdw
  36  * Initial revision
  37  *
  38  */
  39
  40 #ifndef ICRYPT_H
  41 #define ICRYPT_H
  42
  43 #ifdef __cplusplus
  44   extern "C" {
  45 #endif
  46
  47 /*----- Required headers --------------------------------------------------*/
  48
  49 #include <stddef.h>
  50
  51 #ifndef CONFIG_H
  52 #  include "config.h"
  53 #endif
  54
  55 #ifndef IDEA_H
  56 #  include "idea.h"
  57 #endif
  58
  59 /*----- Type definitions --------------------------------------------------*/
  60
  61 /* --- @icrypt_job@ --- */
  62
  63 typedef struct icrypt_job {
  64   idea_key k;                           /* IDEA key for en/decrypting */
  65   int i;                                /* Index into the IV buffer */
  66   char iv[IDEA_BLKSIZE];                /* IV bytes for encrypting */
  67 } icrypt_job;
  68
  69 /*----- Functions provided ------------------------------------------------*/
  70
  71 /* --- @icrypt_init@ --- *
  72  *
  73  * Arguments:   @icrypt_job *j@ = pointer to job context block
  74  *              @unsigned char *k@ = pointer to key data
  75  *              @const unsigned char *iv@ = pointer to IV
  76  *
  77  * Returns:     ---
  78  *
  79  * Use:         Primes the context block ready for encryption.
  80  */
  81
  82 extern void icrypt_init(icrypt_job */*j*/,
  83                         unsigned char */*k*/,
  84                         const unsigned char */*iv*/);
  85
  86 /* --- @icrypt_encrypt@ --- *
  87  *
  88  * Arguments:   @icrypt_job *j@ = job handle
  89  *              @const void *src@ = pointer to source buffer
  90  *              @void *dest@ = pointer to destination buffer
  91  *              @size_t sz@ = size of buffers to handle
  92  *
  93  * Returns:     ---
  94  *
  95  * Use:         Encrypts data from the source to the destination, using the
  96  *              key attached to the job handle.
  97  */
  98
  99 extern void icrypt_encrypt(icrypt_job */*j*/, const void */*src*/,
 100                            void */*dest*/, size_t /*sz*/);
 101
 102 /* --- @icrypt_decrypt@ --- *
 103  *
 104  * Arguments:   @icrypt_job *j@ = job handle
 105  *              @const void *src@ = pointer to source buffer
 106  *              @void *dest@ = pointer to destination buffer
 107  *              @size_t sz@ = size of buffers to handle
 108  *
 109  * Returns:     ---
 110  *
 111  * Use:         Decrypts data from the source to the destination, using
 112  *              the key attached to the job handle.
 113  */
 114
 115 extern void icrypt_decrypt(icrypt_job */*j*/, const void */*src*/,
 116                            void */*dest*/, size_t /*sz*/);
 117
 118 /* --- @icrypt_reset@ --- *
 119  *
 120  * Arguments:   @icrypt_job *j@ = pointer to job context block
 121  *              @unsigned char *k@ = pointer to key data, or zero for
 122  *                      no change
 123  *              @const unsigned char *iv@ = pointer to IV, or zero
 124  *
 125  * Returns:     ---
 126  *
 127  * Use:         Alters the context block.  This can be used after recovery
 128  *              of a session key, for example.
 129  */
 130
 131 extern void icrypt_reset(icrypt_job */*j*/,
 132                          unsigned char */*k*/,
 133                          const unsigned char */*iv*/);
 134
 135 /* --- @icrypt_saveIV@ --- *
 136  *
 137  * Arguments:   @icrypt_job *j@ = pointer to job context block
 138  *              @unsigned char *iv@ = where to store the IV
 139  *
 140  * Returns:     ---
 141  *
 142  * Use:         Writes out the job's IV after munging it a little.
 143  */
 144
 145 extern void icrypt_saveIV(icrypt_job */*j*/, unsigned char */*iv*/);
 146
 147 /*----- That's all, folks -------------------------------------------------*/
 148
 149 #ifdef __cplusplus
 150   }
 151 #endif
 152
 153 #endif