git.distorted.org.uk Git - u/mdw/catacomb/blob - passphrase.h

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Reading passphrases
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb 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 Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 #ifndef CATACOMB_PASSPHRASE_H
  31 #define CATACOMB_PASSPHRASE_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <stddef.h>
  40
  41 /*----- Data structures ---------------------------------------------------*/
  42
  43 /* --- Passphrase modes --- *
  44  *
  45  * @PMODE_VERIFY@ requests that the passphrase be repeated to make sure it's
  46  * right.
  47  */
  48
  49 enum {
  50   PMODE_READ,
  51   PMODE_VERIFY
  52 };
  53
  54 /*----- Functions provided ------------------------------------------------*/
  55
  56 /* --- @passphrase_connect@ ---
  57  *
  58  * Arguments:   @const char *sock@ = socket name to connect to, or null for
  59  *                      default
  60  *
  61  * Returns:     Zero if OK, nonzero if it failed
  62  *
  63  * Use:         Attempts to connect to the passphrase pixie.
  64  */
  65
  66 extern int passphrase_connect(const char */*sock*/);
  67
  68 /* --- @passphrase_read@ --- *
  69  *
  70  * Arguments:   @const char *tag@ = pointer to passphrase tag string
  71  *              @unsigned mode@ = reading mode
  72  *              @char *buf@ = pointer to destination buffer
  73  *              @size_t sz@ = size of destination buffer
  74  *
  75  * Returns:     Zero if successful, nonzero on failure.
  76  *
  77  * Use:         Reads a passphrase from the user, using some system-specific
  78  *              secure mechanism.  The mechanism may keep a cache of
  79  *              passphrases, so the user may not necessarily be prompted.
  80  */
  81
  82 extern int passphrase_read(const char */*tag*/, unsigned /*mode*/,
  83                            char */*buf*/, size_t /*sz*/);
  84
  85 /* --- @passphrase_cancel@ --- *
  86  *
  87  * Arguments:   @const char *tag@ = pointer to passphrase tag string
  88  *
  89  * Returns:     ---
  90  *
  91  * Use:         Attempts to make the passphrase cache forget about a
  92  *              particular passphrase.  This may be useful if the passphrase
  93  *              turns out to be wrong, or if the user is attempting to change
  94  *              the passphrase.
  95  */
  96
  97 extern void passphrase_cancel(const char */*tag*/);
  98
  99 /*----- That's all, folks -------------------------------------------------*/
 100
 101 #ifdef __cplusplus
 102   }
 103 #endif
 104
 105 #endif