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. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include "otp_locl.h"
  40
  41 extern const char *const std_dict[];
  42
  43 unsigned
  44 otp_checksum (OtpKey key)
  45 {
  46   int i;
  47   unsigned sum = 0;
  48
  49   for (i = 0; i < OTPKEYSIZE; ++i)
  50     sum += ((key[i] >> 0) & 0x03)
  51       + ((key[i] >> 2) & 0x03)
  52       + ((key[i] >> 4) & 0x03)
  53       + ((key[i] >> 6) & 0x03);
  54   sum &= 0x03;
  55   return sum;
  56 }
  57
  58 void
  59 otp_print_stddict (OtpKey key, char *str, size_t sz)
  60 {
  61   unsigned sum;
  62
  63   sum = otp_checksum (key);
  64   snprintf (str, sz,
  65             "%s %s %s %s %s %s",
  66             std_dict[(key[0] << 3) | (key[1] >> 5)],
  67             std_dict[((key[1] & 0x1F) << 6) | (key[2] >> 2)],
  68             std_dict[((key[2] & 0x03) << 9) | (key[3] << 1) | (key[4] >> 7)],
  69             std_dict[((key[4] & 0x7F) << 4) | (key[5] >> 4)],
  70             std_dict[((key[5] & 0x0F) << 7) | (key[6] >> 1)],
  71             std_dict[((key[6] & 0x01) << 10) | (key[7] << 2) | sum]);
  72 }
  73
  74 void
  75 otp_print_hex (OtpKey key, char *str, size_t sz)
  76 {
  77   snprintf (str, sz,
  78             "%02x%02x%02x%02x%02x%02x%02x%02x",
  79             key[0], key[1], key[2], key[3],
  80             key[4], key[5], key[6], key[7]);
  81 }
  82
  83 void
  84 otp_print_hex_extended (OtpKey key, char *str, size_t sz)
  85 {
  86   strlcpy (str, OTP_HEXPREFIX, sz);
  87   otp_print_hex (key,
  88                  str + strlen(OTP_HEXPREFIX),
  89                  sz - strlen(OTP_HEXPREFIX));
  90 }
  91
  92 void
  93 otp_print_stddict_extended (OtpKey key, char *str, size_t sz)
  94 {
  95   strlcpy (str, OTP_WORDPREFIX, sz);
  96   otp_print_stddict (key,
  97                      str + strlen(OTP_WORDPREFIX),
  98                      sz - strlen(OTP_WORDPREFIX));
  99 }