lib/silccrypt/ciphers_def.h

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