lib/otp/otp_print.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include "config.h"
  41 RCSID("$Id$");
  42 #endif
  43
  44 #include "otp_locl.h"
  45
  46 extern const char *const std_dict[];
  47
  48 unsigned
  49 otp_checksum (OtpKey key)
  50 {
  51   int i;
  52   unsigned sum = 0;
  53
  54   for (i = 0; i < OTPKEYSIZE; ++i)
  55     sum += ((key[i] >> 0) & 0x03)
  56       + ((key[i] >> 2) & 0x03)
  57       + ((key[i] >> 4) & 0x03)
  58       + ((key[i] >> 6) & 0x03);
  59   sum &= 0x03;
  60   return sum;
  61 }
  62
  63 void
  64 otp_print_stddict (OtpKey key, char *str, size_t sz)
  65 {
  66   unsigned sum;
  67
  68   sum = otp_checksum (key);
  69   snprintf (str, sz,
  70             "%s %s %s %s %s %s",
  71             std_dict[(key[0] << 3) | (key[1] >> 5)],
  72             std_dict[((key[1] & 0x1F) << 6) | (key[2] >> 2)],
  73             std_dict[((key[2] & 0x03) << 9) | (key[3] << 1) | (key[4] >> 7)],
  74             std_dict[((key[4] & 0x7F) << 4) | (key[5] >> 4)],
  75             std_dict[((key[5] & 0x0F) << 7) | (key[6] >> 1)],
  76             std_dict[((key[6] & 0x01) << 10) | (key[7] << 2) | sum]);
  77 }
  78
  79 void
  80 otp_print_hex (OtpKey key, char *str, size_t sz)
  81 {
  82   snprintf (str, sz,
  83             "%02x%02x%02x%02x%02x%02x%02x%02x",
  84             key[0], key[1], key[2], key[3],
  85             key[4], key[5], key[6], key[7]);
  86 }
  87
  88 void
  89 otp_print_hex_extended (OtpKey key, char *str, size_t sz)
  90 {
  91   strncpy (str, OTP_HEXPREFIX, sz);
  92   str[sz-1] = '\0';
  93   otp_print_hex (key, str + strlen(OTP_HEXPREFIX), sz - strlen(OTP_HEXPREFIX));
  94 }
  95
  96 void
  97 otp_print_stddict_extended (OtpKey key, char *str, size_t sz)
  98 {
  99   strncpy (str, OTP_WORDPREFIX, sz);
 100   str[sz-1] = '\0';
 101   otp_print_stddict (key, str + strlen(OTP_WORDPREFIX), sz - strlen(OTP_WORDPREFIX));
 102 }