text: /*
   *  Camellia implementation
   *
   *  Copyright (C) 2006-2010, Brainspark B.V.
   *
   *  This file is part of PolarSSL (http://www.polarssl.org)
   *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
   *
   *  All rights reserved.
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   */
  /*
   *  The Camellia block cipher was designed by NTT and Mitsubishi Electric
   *  Corporation.
   *
   *  http://info.isl.ntt.co.jp/crypt/eng/camellia/dl/01espec.pdf
   */
  
  #include "polarssl/config.h"
  
  #if defined(POLARSSL_CAMELLIA_C)
  
  #include "polarssl/camellia.h"
  
  /*
   * 32-bit integer manipulation macros (big endian)
   */
  #ifndef GET_ULONG_BE
  #define GET_ULONG_BE(n,b,i)                             \
  {                                                       \
      (n) = ( (unsigned long) (b)[(i)    ] << 24 )        \
          | ( (unsigned long) (b)[(i) + 1] << 16 )        \
          | ( (unsigned long) (b)[(i) + 2] <<  8 )        \
          | ( (unsigned long) (b)[(i) + 3]       );       \
  }
  #endif
  
  #ifndef PUT_ULONG_BE
  #define PUT_ULONG_BE(n,b,i)                             \
  {                                                       \
      (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
      (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
      (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
      (b)[(i) + 3] = (unsigned char) ( (n)       );       \
  }
  #endif
  
  static const unsigned char SIGMA_CHARS[6][8] =
  {
      { 0xa0, 0x9e, 0x66, 0x7f, 0x3b, 0xcc, 0x90, 0x8b },
      { 0xb6, 0x7a, 0xe8, 0x58, 0x4c, 0xaa, 0x73, 0xb2 },
      { 0xc6, 0xef, 0x37, 0x2f, 0xe9, 0x4f, 0x82, 0xbe },
      { 0x54, 0xff, 0x53, 0xa5, 0xf1, 0xd3, 0x6f, 0x1c },
      { 0x10, 0xe5, 0x27, 0xfa, 0xde, 0x68, 0x2d, 0x1d },
      { 0xb0, 0x56, 0x88, 0xc2, 0xb3, 0xe6, 0xc1, 0xfd }
  };
  
  #if defined(POLARSSL_CAMELLIA_SMALL_MEMORY)
  
  static const unsigned char FSb[256] =
  {
      112,130, 44,236,179, 39,192,229,228,133, 87, 53,234, 12,174, 65,
       35,239,107,147, 69, 25,165, 33,237, 14, 79, 78, 29,101,146,189,
      134,184,175,143,124,235, 31,206, 62, 48,220, 95, 94,197, 11, 26,
      166,225, 57,202,213, 71, 93, 61,217,  1, 90,214, 81, 86,108, 77,
      139, 13,154,102,251,204,176, 45,116, 18, 43, 32,240,177,132,153,
      223, 76,203,194, 52,126,118,  5,109,183,169, 49,209, 23,  4,215,
       20, 88, 58, 97,222, 27, 17, 28, 50, 15,156, 22, 83, 24,242, 34,
      254, 68,207,178,195,181,122,145, 36,  8,232,168, 96,252,105, 80,
      170,208,160,125,161,137, 98,151, 84, 91, 30,149,224,255,100,210,
       16,196,  0, 72,163,247,117,219,138,  3,230,218,  9, 63,221,148,
      135, 92,131,  2,205, 74,144, 51,115,103,246,243,157,127,191,226,
       82,155,216, 38,200, 55,198, 59,129,150,111, 75, 19,190, 99, 46,
      233,121,167,140,159,110,188,142, 41,245,249,182, 47,253,180, 89,
      120,152,  6,106,231, 70,113,186,212, 37,171, 66,136,162,141,250,
      114,  7,185, 85,248,238,172, 10, 54, 73, 42,104, 60, 56,241,164,
       64, 40,211,123,187,201, 67,193, 21,227,173,244,119,199,128,158
  };
  
  #define SBOX1(n) FSb[(n)]
  #define SBOX2(n) (unsigned char)((FSb[(n)] >> 7 ^ FSb[(n)] << 1) & 0xff)
  #define SBOX3(n) (unsigned char)((FSb[(n)] >> 1 ^ FSb[(n)] << 7) & 0xff)
  #define SBOX4(n) FSb[((n) << 1 ^ (n) >> 7) &0xff]
  
  #else
  
  static const unsigned char FSb[256] =
  {
      112, 130,  44, 236, 179,  39, 192, 229, 228, 133,  87,  53, 234,  12, 174,  65,
      35, 239, 107, 147,  69,  25, 165,  33, 237,  14,  79,  78,  29, 101, 146, 189,
      134, 184, 175, 143, 124, 235,  31, 206,  62,  48, 220,  95,  94, 197,  11,  26,
      166, 225,  57, 202, 213,  71,  93,  61, 217,   1,  90, 214,  81,  86, 108,  77,
      139,  13, 154, 102, 251, 204, 176,  45, 116,  18,  43,  32, 240, 177, 132, 153,
      223,  76, 203, 194,  52, 126, 118,   5, 109, 183, 169,  49, 209,  23,   4, 215,
      20,  88,  58,  97, 222,  27,  17,  28,  50,  15, 156,  22,  83,  24, 242,  34,
      254,  68, 207, 178, 195, 181, 122, 145,  36,   8, 232, 168,  96, 252, 105,  80,
      170, 208, 160, 125, 161, 137,  98, 151,  84,  91,  30, 149, 224, 255, 100, 210,
      16, 196,   0,  72, 163, 247, 117, 219, 138,   3, 230, 218,   9,  63, 221, 148,
      135,  92, 131,   2, 205,  74, 144,  51, 115, 103, 246, 243, 157, 127, 191, 226,
      82, 155, 216,  38, 200,  55, 198,  59, 129, 150, 111,  75,  19, 190,  99,  46,
      233, 121, 167, 140, 159, 110, 188, 142,  41, 245, 249, 182,  47, 253, 180,  89,
      120, 152,   6, 106, 231,  70, 113, 186, 212,  37, 171,  66, 136, 162, 141, 250,
      114,   7, 185,  85, 248, 238, 172,  10,  54,  73,  42, 104,  60,  56, 241, 164,
      64,  40, 211, 123, 187, 201,  67, 193,  21, 227, 173, 244, 119, 199, 128, 158
  };
  
  static const unsigned char FSb2[256] =
  {
      224,   5,  88, 217, 103,  78, 129, 203, 201,  11, 174, 106, 213,  24,  93, 130,
      70, 223, 214,  39, 138,  50,  75,  66, 219,  28, 158, 156,  58, 202,  37, 123,
      13, 113,  95,  31, 248, 215,  62, 157, 124,  96, 185, 190, 188, 139,  22,  52,
      77, 195, 114, 149, 171, 142, 186, 122, 179,   2, 180, 173, 162, 172, 216, 154,
      23,  26,  53, 204, 247, 153,  97,  90, 232,  36,  86,  64, 225,  99,   9,  51,
      191, 152, 151, 133, 104, 252, 236,  10, 218, 111,  83,  98, 163,  46,   8, 175,
      40, 176, 116, 194, 189,  54,  34,  56, 100,  30,  57,  44, 166,  48, 229,  68,
      253, 136, 159, 101, 135, 107, 244,  35,  72,  16, 209,  81, 192, 249, 210, 160,
      85, 161,  65, 250,  67,  19, 196,  47, 168, 182,  60,  43, 193, 255, 200, 165,
      32, 137,   0, 144,  71, 239, 234, 183,  21,   6, 205, 181,  18, 126, 187,  41,
      15, 184,   7,   4, 155, 148,  33, 102, 230, 206, 237, 231,  59, 254, 127, 197,
      164,  55, 177,  76, 145, 110, 141, 118,   3,  45, 222, 150,  38, 125, 198,  92,
      211, 242,  79,  25,  63, 220, 121,  29,  82, 235, 243, 109,  94, 251, 105, 178,
      240,  49,  12, 212, 207, 140, 226, 117, 169,  74,  87, 132,  17,  69,  27, 245,
      228,  14, 115, 170, 241, 221,  89,  20, 108, 146,  84, 208, 120, 112, 227,  73,
      128,  80, 167, 246, 119, 147, 134, 131,  42, 199,  91, 233, 238, 143,   1,  61
  };
  
  static const unsigned char FSb3[256] =
  {
      56,  65,  22, 118, 217, 147,  96, 242, 114, 194, 171, 154, 117,   6,  87, 160,
      145, 247, 181, 201, 162, 140, 210, 144, 246,   7, 167,  39, 142, 178,  73, 222,
      67,  92, 215, 199,  62, 245, 143, 103,  31,  24, 110, 175,  47, 226, 133,  13,
      83, 240, 156, 101, 234, 163, 174, 158, 236, 128,  45, 107, 168,  43,  54, 166,
      197, 134,  77,  51, 253, 102,  88, 150,  58,   9, 149,  16, 120, 216,  66, 204,
      239,  38, 229,  97,  26,  63,  59, 130, 182, 219, 212, 152, 232, 139,   2, 235,
      10,  44,  29, 176, 111, 141, 136,  14,  25, 135,  78,  11, 169,  12, 121,  17,
      127,  34, 231,  89, 225, 218,  61, 200,  18,   4, 116,  84,  48, 126, 180,  40,
      85, 104,  80, 190, 208, 196,  49, 203,  42, 173,  15, 202, 112, 255,  50, 105,
      8,  98,   0,  36, 209, 251, 186, 237,  69, 129, 115, 109, 132, 159, 238,  74,
      195,  46, 193,   1, 230,  37,  72, 153, 185, 179, 123, 249, 206, 191, 223, 113,
      41, 205, 108,  19, 100, 155,  99, 157, 192,  75, 183, 165, 137,  95, 177,  23,
      244, 188, 211,  70, 207,  55,  94,  71, 148, 250, 252,  91, 151, 254,  90, 172,
      60,  76,   3,  53, 243,  35, 184,  93, 106, 146, 213,  33,  68,  81, 198, 125,
      57, 131, 220, 170, 124, 119,  86,   5,  27, 164,  21,  52,  30,  28, 248,  82,
      32,  20, 233, 189, 221, 228, 161, 224, 138, 241, 214, 122, 187, 227,  64,  79
  };
  
  static const unsigned char FSb4[256] =
  {
      112,  44, 179, 192, 228,  87, 234, 174,  35, 107,  69, 165, 237,  79,  29, 146,
      134, 175, 124,  31,  62, 220,  94,  11, 166,  57, 213,  93, 217,  90,  81, 108,
      139, 154, 251, 176, 116,  43, 240, 132, 223, 203,  52, 118, 109, 169, 209,   4,
      20,  58, 222,  17,  50, 156,  83, 242, 254, 207, 195, 122,  36, 232,  96, 105,
      170, 160, 161,  98,  84,  30, 224, 100,  16,   0, 163, 117, 138, 230,   9, 221,
      135, 131, 205, 144, 115, 246, 157, 191,  82, 216, 200, 198, 129, 111,  19,  99,
      233, 167, 159, 188,  41, 249,  47, 180, 120,   6, 231, 113, 212, 171, 136, 141,
      114, 185, 248, 172,  54,  42,  60, 241,  64, 211, 187,  67,  21, 173, 119, 128,
      130, 236,  39, 229, 133,  53,  12,  65, 239, 147,  25,  33,  14,  78, 101, 189,
      184, 143, 235, 206,  48,  95, 197,  26, 225, 202,  71,  61,   1, 214,  86,  77,
      13, 102, 204,  45,  18,  32, 177, 153,  76, 194, 126,   5, 183,  49,  23, 215,
      88,  97,  27,  28,  15,  22,  24,  34,  68, 178, 181, 145,   8, 168, 252,  80,
      208, 125, 137, 151,  91, 149, 255, 210, 196,  72, 247, 219,   3, 218,  63, 148,
      92,   2,  74,  51, 103, 243, 127, 226, 155,  38,  55,  59, 150,  75, 190,  46,
      121, 140, 110, 142, 245, 182, 253,  89, 152, 106,  70, 186,  37,  66, 162, 250,
      7,  85, 238,  10,  73, 104,  56, 164,  40, 123, 201, 193, 227, 244, 199, 158
  };
  
  #define SBOX1(n) FSb[(n)]
  #define SBOX2(n) FSb2[(n)]
  #define SBOX3(n) FSb3[(n)]
  #define SBOX4(n) FSb4[(n)]
  
  #endif
  
  static const unsigned char shifts[2][4][4] =
  {
      {
          { 1, 1, 1, 1 }, /* KL */
          { 0, 0, 0, 0 }, /* KR */
          { 1, 1, 1, 1 }, /* KA */
          { 0, 0, 0, 0 }  /* KB */
      },
      {
          { 1, 0, 1, 1 }, /* KL */
          { 1, 1, 0, 1 }, /* KR */
          { 1, 1, 1, 0 }, /* KA */
          { 1, 1, 0, 1 }  /* KB */
      }
  };
  
  static const signed char indexes[2][4][20] =
  {
      {
          {  0,  1,  2,  3,  8,  9, 10, 11, 38, 39,
            36, 37, 23, 20, 21, 22, 27, -1, -1, 26 }, /* KL -> RK */
          { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, /* KR -> RK */
          {  4,  5,  6,  7, 12, 13, 14, 15, 16, 17,
            18, 19, -1, 24, 25, -1, 31, 28, 29, 30 }, /* KA -> RK */
          { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }  /* KB -> RK */
      },
      {
          {  0,  1,  2,  3, 61, 62, 63, 60, -1, -1,
            -1, -1, 27, 24, 25, 26, 35, 32, 33, 34 }, /* KL -> RK */
          { -1, -1, -1, -1,  8,  9, 10, 11, 16, 17,
            18, 19, -1, -1, -1, -1, 39, 36, 37, 38 }, /* KR -> RK */
          { -1, -1, -1, -1, 12, 13, 14, 15, 58, 59,
            56, 57, 31, 28, 29, 30, -1, -1, -1, -1 }, /* KA -> RK */
          {  4,  5,  6,  7, 65, 66, 67, 64, 20, 21,
            22, 23, -1, -1, -1, -1, 43, 40, 41, 42 }  /* KB -> RK */
      }
  };
  
  static const signed char transposes[2][20] =
  {
      {
          21, 22, 23, 20,
          -1, -1, -1, -1,
          18, 19, 16, 17,
          11,  8,  9, 10,
          15, 12, 13, 14
      },
      {
          25, 26, 27, 24,
          29, 30, 31, 28,
          18, 19, 16, 17,
          -1, -1, -1, -1,
          -1, -1, -1, -1
      }
  };
  
  /* Shift macro for 128 bit strings with rotation smaller than 32 bits (!) */
  #define ROTL(DEST, SRC, SHIFT)                                      \
  {                                                                   \
      (DEST)[0] = (SRC)[0] << (SHIFT) ^ (SRC)[1] >> (32 - (SHIFT));   \
      (DEST)[1] = (SRC)[1] << (SHIFT) ^ (SRC)[2] >> (32 - (SHIFT));   \
      (DEST)[2] = (SRC)[2] << (SHIFT) ^ (SRC)[3] >> (32 - (SHIFT));   \
      (DEST)[3] = (SRC)[3] << (SHIFT) ^ (SRC)[0] >> (32 - (SHIFT));   \
  }
  
  #define FL(XL, XR, KL, KR)                                          \
  {                                                                   \
      (XR) = ((((XL) & (KL)) << 1) | (((XL) & (KL)) >> 31)) ^ (XR);   \
      (XL) = ((XR) | (KR)) ^ (XL);                                    \
  }
      
  #define FLInv(YL, YR, KL, KR)                                       \
  {                                                                   \
      (YL) = ((YR) | (KR)) ^ (YL);                                    \
      (YR) = ((((YL) & (KL)) << 1) | (((YL) & (KL)) >> 31)) ^ (YR);   \
  }
      
  #define SHIFT_AND_PLACE(INDEX, OFFSET)                      \
  {                                                           \
      TK[0] = KC[(OFFSET) * 4 + 0];                           \
      TK[1] = KC[(OFFSET) * 4 + 1];                           \
      TK[2] = KC[(OFFSET) * 4 + 2];                           \
      TK[3] = KC[(OFFSET) * 4 + 3];                           \
                                                              \
      /*@ loop unroll 4; */                                   \
      for ( i = 1; i <= 4; i++ )                              \
          if (shifts[(INDEX)][(OFFSET)][i -1])                \
              ROTL(TK + i * 4, TK, (15 * i) % 32);            \
                                                              \
      /*@ loop unroll 20; */                                  \
      for ( i = 0; i < 20; i++ )                              \
          if (indexes[(INDEX)][(OFFSET)][i] != -1) {          \
          RK[indexes[(INDEX)][(OFFSET)][i]] = TK[ i ];        \
      }                                                       \
  }
  
  /*@
    requires \valid_read(k + (0 .. 1));
    requires \valid_read(x + (0 .. 1));
    assigns *(z + (0 .. 1)) \from *(k + (0 .. 1)), *(x + (0 .. 1));
    ensures \initialized(z + (0 .. 1));
   */
  static void camellia_feistel(const uint32_t x[2], const uint32_t k[2], uint32_t z[2])
  {
      uint32_t I0, I1;
      I0 = x[0] ^ k[0];
      I1 = x[1] ^ k[1];
  
      I0 = (SBOX1((I0 >> 24) & 0xFF) << 24) |
           (SBOX2((I0 >> 16) & 0xFF) << 16) |
           (SBOX3((I0 >>  8) & 0xFF) <<  8) |
           (SBOX4((I0      ) & 0xFF)      );
      I1 = (SBOX2((I1 >> 24) & 0xFF) << 24) |
           (SBOX3((I1 >> 16) & 0xFF) << 16) |
           (SBOX4((I1 >>  8) & 0xFF) <<  8) |
           (SBOX1((I1      ) & 0xFF)      );
  
      I0 ^= (I1 << 8) | (I1 >> 24);
      I1 ^= (I0 << 16) | (I0 >> 16);
      I0 ^= (I1 >> 8) | (I1 << 24);
      I1 ^= (I0 >> 8) | (I0 << 24);
  
      z[0] ^= I1;
      z[1] ^= I0;
  }
  
  /*
   * Camellia key schedule (encryption)
   */
  int camellia_setkey_enc( camellia_context *ctx, const unsigned char *key, unsigned int keysize )
  {
      int idx;
      size_t i;
      uint32_t *RK;
      unsigned char t[64];
      uint32_t SIGMA[6][2];
      uint32_t KC[16];
      uint32_t TK[20];
  
      RK = ctx->rk;
  
      memset(t, 0, 64);
      memset(RK, 0, sizeof(ctx->rk));
  
      switch( keysize )
      {
          case 128: ctx->nr = 3; idx = 0; break;
          case 192:
          case 256: ctx->nr = 4; idx = 1; break;
          default : return( POLARSSL_ERR_CAMELLIA_INVALID_KEY_LENGTH );
      }
  
      //@ loop unroll 32;
      for( i = 0; i < keysize / 8; ++i)
          t[i] = key[i];
  
      if (keysize == 192) {
        //@ loop unroll 8;
          for (i = 0; i < 8; i++)
              t[24 + i] = ~t[16 + i];
      }
  
      /*
       * Prepare SIGMA values
       */
      //@ loop unroll 6;
      for (i = 0; i < 6; i++) {
          GET_ULONG_BE(SIGMA[i][0], SIGMA_CHARS[i], 0);
          GET_ULONG_BE(SIGMA[i][1], SIGMA_CHARS[i], 4);
      }
  
      /*
       * Key storage in KC
       * Order: KL, KR, KA, KB
       */
      memset(KC, 0, sizeof(KC));
  
      /* Store KL, KR */
      //@ loop unroll 8;
      for (i = 0; i < 8; i++)
          GET_ULONG_BE(KC[i], t, i * 4);
  
      /* Generate KA */
      //@ loop unroll 4;
      for( i = 0; i < 4; ++i)
          KC[8 + i] = KC[i] ^ KC[4 + i];
  
      camellia_feistel(KC + 8, SIGMA[0], KC + 10);
      camellia_feistel(KC + 10, SIGMA[1], KC + 8);
  
      //@ loop unroll 4;
      for( i = 0; i < 4; ++i)
          KC[8 + i] ^= KC[i];
  
      camellia_feistel(KC + 8, SIGMA[2], KC + 10);
      camellia_feistel(KC + 10, SIGMA[3], KC + 8);
  
      if (keysize > 128) {
          /* Generate KB */
        //@ loop unroll 4;
          for( i = 0; i < 4; ++i)
              KC[12 + i] = KC[4 + i] ^ KC[8 + i];
  
          camellia_feistel(KC + 12, SIGMA[4], KC + 14);
          camellia_feistel(KC + 14, SIGMA[5], KC + 12);
      }
  
      /*
       * Generating subkeys
       */ 
  
      /* Manipulating KL */
      SHIFT_AND_PLACE(idx, 0);
  
      /* Manipulating KR */
      if (keysize > 128) {
          SHIFT_AND_PLACE(idx, 1);
      }
  
      /* Manipulating KA */
      SHIFT_AND_PLACE(idx, 2);
  
      /* Manipulating KB */
      if (keysize > 128) {
          SHIFT_AND_PLACE(idx, 3);
      }
  
      /* Do transpositions */
      //@ loop unroll 20;
      for ( i = 0; i < 20; i++ ) {
          if (transposes[idx][i] != -1) {
              RK[32 + 12 * idx + i] = RK[transposes[idx][i]];
          }
      }
  
      return( 0 );
  }
  
  /*
   * Camellia key schedule (decryption)
   */
  int camellia_setkey_dec( camellia_context *ctx, const unsigned char *key, unsigned int keysize )
  {
      int idx;
      size_t i;
      camellia_context cty;
      uint32_t *RK;
      uint32_t *SK;
      int ret;
  
      switch( keysize )
      {
          case 128: ctx->nr = 3; idx = 0; break;
          case 192:
          case 256: ctx->nr = 4; idx = 1; break;
          default : return( POLARSSL_ERR_CAMELLIA_INVALID_KEY_LENGTH );
      }
  
      RK = ctx->rk;
  
      ret = camellia_setkey_enc(&cty, key, keysize);
      if( ret != 0 )
          return( ret );
  
      SK = cty.rk + 24 * 2 + 8 * idx * 2;
  
      *RK++ = *SK++;
      *RK++ = *SK++;
      *RK++ = *SK++;
      *RK++ = *SK++;
  
  
      //@ loop unroll 30;
      for (i = 22 + 8 * idx, SK -= 6; i > 0; i--, SK -= 4)
      {
          *RK++ = *SK++;
          *RK++ = *SK++;
      }
  
      SK -= 2;
  
      *RK++ = *SK++;
      *RK++ = *SK++;
      *RK++ = *SK++;
      *RK++ = *SK++;
  
      memset( &cty, 0, sizeof( camellia_context ) );
  
      return( 0 );
  }
  
  /*
   * Camellia-ECB block encryption/decryption
   */
  int camellia_crypt_ecb( camellia_context *ctx,
                      int mode,
                      const unsigned char input[16],
                      unsigned char output[16] )
  {
      int NR;
      uint32_t *RK, X[4];
  
      ( (void) mode );
  
      NR = ctx->nr;
      RK = ctx->rk;
  
      GET_ULONG_BE( X[0], input,  0 );
      GET_ULONG_BE( X[1], input,  4 );
      GET_ULONG_BE( X[2], input,  8 );
      GET_ULONG_BE( X[3], input, 12 );
  
      X[0] ^= *RK++;
      X[1] ^= *RK++;
      X[2] ^= *RK++;
      X[3] ^= *RK++;
  
      while (NR) {
          --NR;
          camellia_feistel(X, RK, X + 2);
          RK += 2;
          camellia_feistel(X + 2, RK, X);
          RK += 2;
          camellia_feistel(X, RK, X + 2);
          RK += 2;
          camellia_feistel(X + 2, RK, X);
          RK += 2;
          camellia_feistel(X, RK, X + 2);
          RK += 2;
          camellia_feistel(X + 2, RK, X);
          RK += 2;
  
          if (NR) {
              FL(X[0], X[1], RK[0], RK[1]);
              RK += 2;
              FLInv(X[2], X[3], RK[0], RK[1]);
              RK += 2;
          }
      }
  
      X[2] ^= *RK++;
      X[3] ^= *RK++;
      X[0] ^= *RK++;
      X[1] ^= *RK++;
  
      PUT_ULONG_BE( X[2], output,  0 );
      PUT_ULONG_BE( X[3], output,  4 );
      PUT_ULONG_BE( X[0], output,  8 );
      PUT_ULONG_BE( X[1], output, 12 );
  
      return( 0 );
  }
  
  /*
   * Camellia-CBC buffer encryption/decryption
   */
  int camellia_crypt_cbc( camellia_context *ctx,
                      int mode,
                      size_t length,
                      unsigned char iv[16],
                      const unsigned char *input,
                      unsigned char *output )
  {
      int i;
      unsigned char temp[16];
  
      if( length % 16 )
          return( POLARSSL_ERR_CAMELLIA_INVALID_INPUT_LENGTH );
  
      if( mode == CAMELLIA_DECRYPT )
      {
          while( length > 0 )
          {
              memcpy( temp, input, 16 );
              camellia_crypt_ecb( ctx, mode, input, output );
  
              for( i = 0; i < 16; i++ )
                  output[i] = (unsigned char)( output[i] ^ iv[i] );
  
              memcpy( iv, temp, 16 );
  
              input  += 16;
              output += 16;
              length -= 16;
          }
      }
      else
      {
          while( length > 0 )
          {
              for( i = 0; i < 16; i++ )
                  output[i] = (unsigned char)( input[i] ^ iv[i] );
  
              camellia_crypt_ecb( ctx, mode, output, output );
              memcpy( iv, output, 16 );
  
              input  += 16;
              output += 16;
              length -= 16;
          }
      }
  
      return( 0 );
  }
  
  #if defined(POLARSSL_CIPHER_MODE_CFB)
  /*
   * Camellia-CFB128 buffer encryption/decryption
   */
  int camellia_crypt_cfb128( camellia_context *ctx,
                         int mode,
                         size_t length,
                         size_t *iv_off,
                         unsigned char iv[16],
                         const unsigned char *input,
                         unsigned char *output )
  {
      int c;
      size_t n = *iv_off;
  
      if( mode == CAMELLIA_DECRYPT )
      {
          while( length-- )
          {
              if( n == 0 )
                  camellia_crypt_ecb( ctx, CAMELLIA_ENCRYPT, iv, iv );
  
              c = *input++;
              *output++ = (unsigned char)( c ^ iv[n] );
              iv[n] = (unsigned char) c;
  
              n = (n + 1) & 0x0F;
          }
      }
      else
      {
          while( length-- )
          {
              if( n == 0 )
                  camellia_crypt_ecb( ctx, CAMELLIA_ENCRYPT, iv, iv );
  
              iv[n] = *output++ = (unsigned char)( iv[n] ^ *input++ );
  
              n = (n + 1) & 0x0F;
          }
      }
  
      *iv_off = n;
  
      return( 0 );
  }
  #endif /* POLARSSL_CIPHER_MODE_CFB */
  
  #if defined(POLARSSL_CIPHER_MODE_CTR)
  /*
   * Camellia-CTR buffer encryption/decryption
   */
  int camellia_crypt_ctr( camellia_context *ctx,
                         size_t length,
                         size_t *nc_off,
                         unsigned char nonce_counter[16],
                         unsigned char stream_block[16],
                         const unsigned char *input,
                         unsigned char *output )
  {
      int c, i, cb;
      size_t n = *nc_off;
  
      while( length-- )
      {
          if( n == 0 ) {
              camellia_crypt_ecb( ctx, CAMELLIA_ENCRYPT, nonce_counter, stream_block );
  
              i = 15;
              do {
                 nonce_counter[i]++;
                 cb = nonce_counter[i] == 0;
              } while( i-- && cb );
  
          }
          c = *input++;
          *output++ = (unsigned char)( c ^ stream_block[n] );
  
          n = (n + 1) & 0x0F;
      }
  
      *nc_off = n;
  
      return( 0 );
  }
  #endif /* POLARSSL_CIPHER_MODE_CTR */
  
  #if defined(POLARSSL_SELF_TEST)
  
  #include <stdio.h>
  
  /*
   * Camellia test vectors from:
   *
   * http://info.isl.ntt.co.jp/crypt/eng/camellia/technology.html:
   *   http://info.isl.ntt.co.jp/crypt/eng/camellia/dl/cryptrec/intermediate.txt
   *   http://info.isl.ntt.co.jp/crypt/eng/camellia/dl/cryptrec/t_camellia.txt
   *                      (For each bitlength: Key 0, Nr 39)
   */
  #define CAMELLIA_TESTS_ECB  2
  
  static const unsigned char camellia_test_ecb_key[3][CAMELLIA_TESTS_ECB][32] =
  {
      {
          { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10 },
          { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
      },
      {
          { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
            0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77 },
          { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
      },
      {
          { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
            0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
            0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
          { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
      },
  };
  
  static const unsigned char camellia_test_ecb_plain[CAMELLIA_TESTS_ECB][16] =
  {
      { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
        0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10 },
      { 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
  };
  
  static const unsigned char camellia_test_ecb_cipher[3][CAMELLIA_TESTS_ECB][16] =
  {
      {
          { 0x67, 0x67, 0x31, 0x38, 0x54, 0x96, 0x69, 0x73,
            0x08, 0x57, 0x06, 0x56, 0x48, 0xea, 0xbe, 0x43 },
          { 0x38, 0x3C, 0x6C, 0x2A, 0xAB, 0xEF, 0x7F, 0xDE,
            0x25, 0xCD, 0x47, 0x0B, 0xF7, 0x74, 0xA3, 0x31 }
      },
      {
          { 0xb4, 0x99, 0x34, 0x01, 0xb3, 0xe9, 0x96, 0xf8,
            0x4e, 0xe5, 0xce, 0xe7, 0xd7, 0x9b, 0x09, 0xb9 },
          { 0xD1, 0x76, 0x3F, 0xC0, 0x19, 0xD7, 0x7C, 0xC9,
            0x30, 0xBF, 0xF2, 0xA5, 0x6F, 0x7C, 0x93, 0x64 }
      },
      {
          { 0x9a, 0xcc, 0x23, 0x7d, 0xff, 0x16, 0xd7, 0x6c,
            0x20, 0xef, 0x7c, 0x91, 0x9e, 0x3a, 0x75, 0x09 },
          { 0x05, 0x03, 0xFB, 0x10, 0xAB, 0x24, 0x1E, 0x7C,
            0xF4, 0x5D, 0x8C, 0xDE, 0xEE, 0x47, 0x43, 0x35 }
      }
  };
  
  #define CAMELLIA_TESTS_CBC  3
  
  static const unsigned char camellia_test_cbc_key[3][32] =
  {
          { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6,
            0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C }
      ,
          { 0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52,
            0xC8, 0x10, 0xF3, 0x2B, 0x80, 0x90, 0x79, 0xE5,
            0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C, 0x6B, 0x7B }
      ,
          { 0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE,
            0x2B, 0x73, 0xAE, 0xF0, 0x85, 0x7D, 0x77, 0x81,
            0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61, 0x08, 0xD7,
            0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4 }
  };
  
  static const unsigned char camellia_test_cbc_iv[16] =
  
      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }
  ;
  
  static const unsigned char camellia_test_cbc_plain[CAMELLIA_TESTS_CBC][16] =
  {
      { 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96,
        0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
      { 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C,
        0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
      { 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11,
        0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF }
  
  };
  
  static const unsigned char camellia_test_cbc_cipher[3][CAMELLIA_TESTS_CBC][16] =
  {
      {
          { 0x16, 0x07, 0xCF, 0x49, 0x4B, 0x36, 0xBB, 0xF0,
            0x0D, 0xAE, 0xB0, 0xB5, 0x03, 0xC8, 0x31, 0xAB },
          { 0xA2, 0xF2, 0xCF, 0x67, 0x16, 0x29, 0xEF, 0x78,
            0x40, 0xC5, 0xA5, 0xDF, 0xB5, 0x07, 0x48, 0x87 },
          { 0x0F, 0x06, 0x16, 0x50, 0x08, 0xCF, 0x8B, 0x8B,
            0x5A, 0x63, 0x58, 0x63, 0x62, 0x54, 0x3E, 0x54 }
      },
      {
          { 0x2A, 0x48, 0x30, 0xAB, 0x5A, 0xC4, 0xA1, 0xA2,
            0x40, 0x59, 0x55, 0xFD, 0x21, 0x95, 0xCF, 0x93 },
          { 0x5D, 0x5A, 0x86, 0x9B, 0xD1, 0x4C, 0xE5, 0x42,
            0x64, 0xF8, 0x92, 0xA6, 0xDD, 0x2E, 0xC3, 0xD5 },
          { 0x37, 0xD3, 0x59, 0xC3, 0x34, 0x98, 0x36, 0xD8,
            0x84, 0xE3, 0x10, 0xAD, 0xDF, 0x68, 0xC4, 0x49 }
      },
      {
          { 0xE6, 0xCF, 0xA3, 0x5F, 0xC0, 0x2B, 0x13, 0x4A,
            0x4D, 0x2C, 0x0B, 0x67, 0x37, 0xAC, 0x3E, 0xDA },
          { 0x36, 0xCB, 0xEB, 0x73, 0xBD, 0x50, 0x4B, 0x40,
            0x70, 0xB1, 0xB7, 0xDE, 0x2B, 0x21, 0xEB, 0x50 },
          { 0xE3, 0x1A, 0x60, 0x55, 0x29, 0x7D, 0x96, 0xCA,
            0x33, 0x30, 0xCD, 0xF1, 0xB1, 0x86, 0x0A, 0x83 }
      }
  };
  
  #if defined(POLARSSL_CIPHER_MODE_CTR)
  /*
   * Camellia-CTR test vectors from:
   *
   * http://www.faqs.org/rfcs/rfc5528.html
   */
  
  static const unsigned char camellia_test_ctr_key[3][16] =
  {
      { 0xAE, 0x68, 0x52, 0xF8, 0x12, 0x10, 0x67, 0xCC,
        0x4B, 0xF7, 0xA5, 0x76, 0x55, 0x77, 0xF3, 0x9E },
      { 0x7E, 0x24, 0x06, 0x78, 0x17, 0xFA, 0xE0, 0xD7,
        0x43, 0xD6, 0xCE, 0x1F, 0x32, 0x53, 0x91, 0x63 },
      { 0x76, 0x91, 0xBE, 0x03, 0x5E, 0x50, 0x20, 0xA8,
        0xAC, 0x6E, 0x61, 0x85, 0x29, 0xF9, 0xA0, 0xDC }
  };
  
  static const unsigned char camellia_test_ctr_nonce_counter[3][16] =
  {
      { 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
      { 0x00, 0x6C, 0xB6, 0xDB, 0xC0, 0x54, 0x3B, 0x59,
        0xDA, 0x48, 0xD9, 0x0B, 0x00, 0x00, 0x00, 0x01 },
      { 0x00, 0xE0, 0x01, 0x7B, 0x27, 0x77, 0x7F, 0x3F,
        0x4A, 0x17, 0x86, 0xF0, 0x00, 0x00, 0x00, 0x01 }
  };
  
  static const unsigned char camellia_test_ctr_pt[3][48] =
  {
      { 0x53, 0x69, 0x6E, 0x67, 0x6C, 0x65, 0x20, 0x62,
        0x6C, 0x6F, 0x63, 0x6B, 0x20, 0x6D, 0x73, 0x67 },
  
      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F },
  
      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
        0x20, 0x21, 0x22, 0x23 }
  };
  
  static const unsigned char camellia_test_ctr_ct[3][48] =
  {
      { 0xD0, 0x9D, 0xC2, 0x9A, 0x82, 0x14, 0x61, 0x9A,
        0x20, 0x87, 0x7C, 0x76, 0xDB, 0x1F, 0x0B, 0x3F },
      { 0xDB, 0xF3, 0xC7, 0x8D, 0xC0, 0x83, 0x96, 0xD4,
        0xDA, 0x7C, 0x90, 0x77, 0x65, 0xBB, 0xCB, 0x44,
        0x2B, 0x8E, 0x8E, 0x0F, 0x31, 0xF0, 0xDC, 0xA7,
        0x2C, 0x74, 0x17, 0xE3, 0x53, 0x60, 0xE0, 0x48 },
      { 0xB1, 0x9D, 0x1F, 0xCD, 0xCB, 0x75, 0xEB, 0x88,
        0x2F, 0x84, 0x9C, 0xE2, 0x4D, 0x85, 0xCF, 0x73,
        0x9C, 0xE6, 0x4B, 0x2B, 0x5C, 0x9D, 0x73, 0xF1,
        0x4F, 0x2D, 0x5D, 0x9D, 0xCE, 0x98, 0x89, 0xCD,
        0xDF, 0x50, 0x86, 0x96 }
  };
  
  static const int camellia_test_ctr_len[3] =
      { 16, 32, 36 };
  #endif /* POLARSSL_CIPHER_MODE_CTR */
  
  /*
   * Checkup routine
   */
  int camellia_self_test( int verbose )
  {
      int i, j, u, v;
      unsigned char key[32];
      unsigned char buf[64];
      unsigned char src[16];
      unsigned char dst[16];
      unsigned char iv[16];
  #if defined(POLARSSL_CIPHER_MODE_CTR)
      size_t offset, len;
      unsigned char nonce_counter[16];
      unsigned char stream_block[16];
  #endif
  
      camellia_context ctx;
  
      memset( key, 0, 32 );
  
      for (j = 0; j < 6; j++) {
          u = j >> 1;
      v = j & 1;
  
      if( verbose != 0 )
          printf( "  CAMELLIA-ECB-%3d (%s): ", 128 + u * 64,
                  (v == CAMELLIA_DECRYPT) ? "dec" : "enc");
  
      for (i = 0; i < CAMELLIA_TESTS_ECB; i++ ) {
          memcpy( key, camellia_test_ecb_key[u][i], 16 + 8 * u);
  
          if (v == CAMELLIA_DECRYPT) {
              camellia_setkey_dec(&ctx, key, 128 + u * 64);
              memcpy(src, camellia_test_ecb_cipher[u][i], 16);
              memcpy(dst, camellia_test_ecb_plain[i], 16);
          } else { /* CAMELLIA_ENCRYPT */
              camellia_setkey_enc(&ctx, key, 128 + u * 64);
              memcpy(src, camellia_test_ecb_plain[i], 16);
              memcpy(dst, camellia_test_ecb_cipher[u][i], 16);
          }
  
          camellia_crypt_ecb(&ctx, v, src, buf);
  
          if( memcmp( buf, dst, 16 ) != 0 )
          {
              if( verbose != 0 )
                  printf( "failed\n" );
  
              return( 1 );
          }
      }
  
      if( verbose != 0 )
          printf( "passed\n" );
      }
  
      if( verbose != 0 )
          printf( "\n" );
  
      /*
       * CBC mode
       */
      for( j = 0; j < 6; j++ )
      {
          u = j >> 1;
          v = j  & 1;
  
          if( verbose != 0 )
              printf( "  CAMELLIA-CBC-%3d (%s): ", 128 + u * 64,
                      ( v == CAMELLIA_DECRYPT ) ? "dec" : "enc" );
  
      memcpy( src, camellia_test_cbc_iv, 16);
      memcpy( dst, camellia_test_cbc_iv, 16);
      memcpy( key, camellia_test_cbc_key[u], 16 + 8 * u);
  
      if (v == CAMELLIA_DECRYPT) {
          camellia_setkey_dec(&ctx, key, 128 + u * 64);
      } else {
          camellia_setkey_enc(&ctx, key, 128 + u * 64);
      }
  
      for (i = 0; i < CAMELLIA_TESTS_CBC; i++ ) {
  
          if (v == CAMELLIA_DECRYPT) {
              memcpy( iv , src, 16 );
              memcpy(src, camellia_test_cbc_cipher[u][i], 16);
              memcpy(dst, camellia_test_cbc_plain[i], 16);
          } else { /* CAMELLIA_ENCRYPT */
              memcpy( iv , dst, 16 );
              memcpy(src, camellia_test_cbc_plain[i], 16);
              memcpy(dst, camellia_test_cbc_cipher[u][i], 16);
          }
  
          camellia_crypt_cbc(&ctx, v, 16, iv, src, buf);
  
          if( memcmp( buf, dst, 16 ) != 0 )
          {
              if( verbose != 0 )
                  printf( "failed\n" );
  
              return( 1 );
          }
      }
  
          if( verbose != 0 )
              printf( "passed\n" );
      }
  
      if( verbose != 0 )
          printf( "\n" );
  
  #if defined(POLARSSL_CIPHER_MODE_CTR)
      /*
       * CTR mode
       */
      for( i = 0; i < 6; i++ )
      {
          u = i >> 1;
          v = i  & 1;
  
          if( verbose != 0 )
              printf( "  CAMELLIA-CTR-128 (%s): ",
                      ( v == CAMELLIA_DECRYPT ) ? "dec" : "enc" );
  
          memcpy( nonce_counter, camellia_test_ctr_nonce_counter[u], 16 );
          memcpy( key, camellia_test_ctr_key[u], 16 );
  
          offset = 0;
          camellia_setkey_enc( &ctx, key, 128 );
  
          if( v == CAMELLIA_DECRYPT )
          {
              len = camellia_test_ctr_len[u];
              memcpy( buf, camellia_test_ctr_ct[u], len );
  
              camellia_crypt_ctr( &ctx, len, &offset, nonce_counter, stream_block, buf, buf );
  
              if( memcmp( buf, camellia_test_ctr_pt[u], len ) != 0 )
              {
                  if( verbose != 0 )
                      printf( "failed\n" );
  
                  return( 1 );
              }
          }
          else
          {
              len = camellia_test_ctr_len[u];
              memcpy( buf, camellia_test_ctr_pt[u], len );
  
              camellia_crypt_ctr( &ctx, len, &offset, nonce_counter, stream_block, buf, buf );
  
              if( memcmp( buf, camellia_test_ctr_ct[u], len ) != 0 )
              {
                  if( verbose != 0 )
                      printf( "failed\n" );
  
                  return( 1 );
              }
          }
  
          if( verbose != 0 )
              printf( "passed\n" );
      }
  
      if( verbose != 0 )
          printf( "\n" );
  #endif /* POLARSSL_CIPHER_MODE_CTR */
  
      return ( 0 );
  }
  
  #endif
  
  #endif
  