libpurple/protocols/zephyr/ZFmtAuth.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains source for the ZFormatAuthenticNotice function.
   3  *
   4  *      Created by:     Robert French
   5
   6  *      Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
   7  *      For copying and distribution information, see the file
   8  *      "mit-copyright.h".
   9  */
  10
  11 #include "internal.h"
  12
  13 #ifdef ZEPHYR_USES_KERBEROS
  14 Code_t ZFormatAuthenticNotice(notice, buffer, buffer_len, len, session)
  15     ZNotice_t *notice;
  16     register char *buffer;
  17     register int buffer_len;
  18     int *len;
  19     C_Block session;
  20 {
  21     ZNotice_t newnotice;
  22     char *ptr;
  23     int retval, hdrlen;
  24
  25     newnotice = *notice;
  26     newnotice.z_auth = 1;
  27     newnotice.z_authent_len = 0;
  28     newnotice.z_ascii_authent = "";
  29
  30     if ((retval = Z_FormatRawHeader(&newnotice, buffer, buffer_len,
  31                                     &hdrlen, &ptr, NULL)) != ZERR_NONE)
  32         return (retval);
  33
  34 #ifdef NOENCRYPTION
  35     newnotice.z_checksum = 0;
  36 #else
  37     newnotice.z_checksum =
  38         (ZChecksum_t)des_quad_cksum(buffer, NULL, ptr - buffer, 0, (C_Block*)session);
  39 #endif
  40     if ((retval = Z_FormatRawHeader(&newnotice, buffer, buffer_len,
  41                                     &hdrlen, NULL, NULL)) != ZERR_NONE)
  42         return (retval);
  43
  44     ptr = buffer+hdrlen;
  45
  46     if (newnotice.z_message_len+hdrlen > buffer_len)
  47         return (ZERR_PKTLEN);
  48
  49     (void) memcpy(ptr, newnotice.z_message, newnotice.z_message_len);
  50
  51     *len = hdrlen+newnotice.z_message_len;
  52
  53     if (*len > Z_MAXPKTLEN)
  54         return (ZERR_PKTLEN);
  55
  56     return (ZERR_NONE);
  57 }
  58 #endif