crypto/external/bsd/heimdal/dist/lib/otp/otp_print.c

   1 /*      $NetBSD: otp_print.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */
   2
   3 /*
   4  * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 __RCSID("NetBSD");
  39 #endif
  40
  41 #include "otp_locl.h"
  42
  43 extern const char *const std_dict[];
  44
  45 unsigned
  46 otp_checksum (OtpKey key)
  47 {
  48   int i;
  49   unsigned sum = 0;
  50
  51   for (i = 0; i < OTPKEYSIZE; ++i)
  52     sum += ((key[i] >> 0) & 0x03)
  53       + ((key[i] >> 2) & 0x03)
  54       + ((key[i] >> 4) & 0x03)
  55       + ((key[i] >> 6) & 0x03);
  56   sum &= 0x03;
  57   return sum;
  58 }
  59
  60 void
  61 otp_print_stddict (OtpKey key, char *str, size_t sz)
  62 {
  63   unsigned sum;
  64
  65   sum = otp_checksum (key);
  66   snprintf (str, sz,
  67             "%s %s %s %s %s %s",
  68             std_dict[(key[0] << 3) | (key[1] >> 5)],
  69             std_dict[((key[1] & 0x1F) << 6) | (key[2] >> 2)],
  70             std_dict[((key[2] & 0x03) << 9) | (key[3] << 1) | (key[4] >> 7)],
  71             std_dict[((key[4] & 0x7F) << 4) | (key[5] >> 4)],
  72             std_dict[((key[5] & 0x0F) << 7) | (key[6] >> 1)],
  73             std_dict[((key[6] & 0x01) << 10) | (key[7] << 2) | sum]);
  74 }
  75
  76 void
  77 otp_print_hex (OtpKey key, char *str, size_t sz)
  78 {
  79   snprintf (str, sz,
  80             "%02x%02x%02x%02x%02x%02x%02x%02x",
  81             key[0], key[1], key[2], key[3],
  82             key[4], key[5], key[6], key[7]);
  83 }
  84
  85 void
  86 otp_print_hex_extended (OtpKey key, char *str, size_t sz)
  87 {
  88   strlcpy (str, OTP_HEXPREFIX, sz);
  89   otp_print_hex (key,
  90                  str + strlen(OTP_HEXPREFIX),
  91                  sz - strlen(OTP_HEXPREFIX));
  92 }
  93
  94 void
  95 otp_print_stddict_extended (OtpKey key, char *str, size_t sz)
  96 {
  97   strlcpy (str, OTP_WORDPREFIX, sz);
  98   otp_print_stddict (key,
  99                      str + strlen(OTP_WORDPREFIX),
 100                      sz - strlen(OTP_WORDPREFIX));
 101 }