lib/silccrypt/ciphers_def.h

   1 /*
   2
   3   ciphers_def.h
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 1999 - 2000 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19
  20 #ifndef CIPHERS_DEF_H
  21 #define CIPHERS_DEF_H
  22
  23 /* General definitions for algorithms */
  24 typedef unsigned char u1byte;
  25 typedef SilcUInt32 u4byte;
  26 typedef SilcUInt32 u32;
  27
  28 #define rotr(x, nr) (((x) >> ((int)(nr))) | ((x) << (32 - (int)(nr))))
  29 #define rotl(x, nr) (((x) << ((int)(nr))) | ((x) >> (32 - (int)(nr))))
  30 #define byte(x, nr) ((x) >> (nr * 8) & 255)
  31
  32 /* Byte key to words */
  33 #define SILC_GET_WORD_KEY(s, d, len)            \
  34 do {                                            \
  35   int _i;                                       \
  36   for (_i = 0; _i < (len / 8) / 4; _i++)        \
  37     SILC_GET32_LSB(d[_i], s + (_i * 4));        \
  38 } while(0);
  39
  40 /* CBC mode macros. */
  41
  42 #define SILC_CBC_GET_IV(d, s)                   \
  43 do {                                            \
  44   SILC_GET32_LSB(d[0], &s[0]);                  \
  45   SILC_GET32_LSB(d[1], &s[4]);                  \
  46   SILC_GET32_LSB(d[2], &s[8]);                  \
  47   SILC_GET32_LSB(d[3], &s[12]);                 \
  48 } while(0);
  49
  50 #define SILC_CBC_PUT_IV(s, d)                   \
  51 do {                                            \
  52   SILC_PUT32_LSB(s[0], &d[0]);                  \
  53   SILC_PUT32_LSB(s[1], &d[4]);                  \
  54   SILC_PUT32_LSB(s[2], &d[8]);                  \
  55   SILC_PUT32_LSB(s[3], &d[12]);                 \
  56 } while(0);
  57
  58 #define SILC_CBC_ENC_PRE(d, s)                  \
  59 do {                                            \
  60   SILC_GET32_X_LSB(d[0], &s[0]);                \
  61   SILC_GET32_X_LSB(d[1], &s[4]);                \
  62   SILC_GET32_X_LSB(d[2], &s[8]);                \
  63   SILC_GET32_X_LSB(d[3], &s[12]);               \
  64 } while(0);
  65
  66 #define SILC_CBC_ENC_POST(s, d, t)              \
  67 do {                                            \
  68   SILC_PUT32_LSB(s[0], &d[0]);                  \
  69   SILC_PUT32_LSB(s[1], &d[4]);                  \
  70   SILC_PUT32_LSB(s[2], &d[8]);                  \
  71   SILC_PUT32_LSB(s[3], &d[12]);                 \
  72                                                 \
  73   d += 16;                                      \
  74   t += 16;                                      \
  75 } while(0);
  76
  77 #define SILC_CBC_DEC_PRE(d, s)                  \
  78 do {                                            \
  79   SILC_GET32_LSB(d[0], &s[0]);                  \
  80   SILC_GET32_LSB(d[1], &s[4]);                  \
  81   SILC_GET32_LSB(d[2], &s[8]);                  \
  82   SILC_GET32_LSB(d[3], &s[12]);                 \
  83 } while(0);
  84
  85 #define SILC_CBC_DEC_POST(s, d, p, t, siv)      \
  86 do {                                            \
  87   s[0] ^= siv[0];                               \
  88   s[1] ^= siv[1];                               \
  89   s[2] ^= siv[2];                               \
  90   s[3] ^= siv[3];                               \
  91                                                 \
  92   SILC_PUT32_LSB(s[0], &d[0]);                  \
  93   SILC_PUT32_LSB(s[1], &d[4]);                  \
  94   SILC_PUT32_LSB(s[2], &d[8]);                  \
  95   SILC_PUT32_LSB(s[3], &d[12]);                 \
  96                                                 \
  97   siv[0] = t[0];                                \
  98   siv[1] = t[1];                                \
  99   siv[2] = t[2];                                \
 100   siv[3] = t[3];                                \
 101                                                 \
 102   d += 16;                                      \
 103   p += 16;                                      \
 104 } while(0);
 105
 106 #endif