mdw@git.distorted.org.uk Git - tripe/blob - servutil.c

   1 /* -*-c-*-
   2  *
   3  * $Id: servutil.c,v 1.4 2004/04/03 12:35:13 mdw Exp $
   4  *
   5  * Various handy server-only utilities
   6  *
   7  * (c) 2001 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Trivial IP Encryption (TrIPE).
  13  *
  14  * TrIPE 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  * TrIPE 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 TrIPE; 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: servutil.c,v $
  32  * Revision 1.4  2004/04/03 12:35:13  mdw
  33  * Support elliptic curve key exchange.
  34  *
  35  * Revision 1.3  2001/06/19 22:08:11  mdw
  36  * Use magic number for packet size.
  37  *
  38  * Revision 1.2  2001/02/16 21:41:06  mdw
  39  * Use new spare buffer for building MP textual representations.  Add a
  40  * function for making human-readable time strings.
  41  *
  42  * Revision 1.1  2001/02/03 20:26:37  mdw
  43  * Initial checkin.
  44  *
  45  */
  46
  47 /*----- Header files ------------------------------------------------------*/
  48
  49 #include "tripe.h"
  50
  51 /*----- Global variables --------------------------------------------------*/
  52
  53 octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ];
  54
  55 /*----- Main code ---------------------------------------------------------*/
  56
  57 /* --- @mpstr@ --- *
  58  *
  59  * Arguments:   @mp *m@ = a multiprecision integer
  60  *
  61  * Returns:     A pointer to the integer's textual representation.
  62  *
  63  * Use:         Converts a multiprecision integer to a string.  Corrupts
  64  *              @buf_t@.
  65  */
  66
  67 const char *mpstr(mp *m)
  68 {
  69   if (mp_writestring(m, (char *)buf_t, sizeof(buf_t), 10))
  70     return ("<failed>");
  71   return ((const char *)buf_t);
  72 }
  73
  74 /* --- @gestr@ --- *
  75  *
  76  * Arguments:   @group *g@ = a group
  77  *              @ge *x@ = a group element
  78  *
  79  * Returns:     A pointer to the element's textual representation.
  80  *
  81  * Use:         Converts a group element to a string.  Corrupts
  82  *              @buf_t@.
  83  */
  84
  85 const char *gestr(group *g, ge *x)
  86 {
  87   if (group_writestring(g, x, (char *)buf_t, sizeof(buf_t)))
  88     return ("<failed>");
  89   return ((const char *)buf_t);
  90 }
  91
  92 /* --- @timestr@ --- *
  93  *
  94  * Arguments:   @time_t t@ = a time to convert
  95  *
  96  * Returns:     A pointer to a textual representation of the time.
  97  *
  98  * Use:         Converts a time to a textual representation.  Corrupts
  99  *              @buf_t@.
 100  */
 101
 102 const char *timestr(time_t t)
 103 {
 104   struct tm *tm;
 105   if (!t)
 106     return ("NEVER");
 107   tm = localtime(&t);
 108   strftime((char *)buf_t, sizeof(buf_t), "%Y-%m-%dT%H:%M:%S", tm);
 109   return ((const char *)buf_t);
 110 }
 111
 112 /*----- That's all, folks -------------------------------------------------*/