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5.1 Permutative Encoding

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The following algorithm is used for NDB_CRYPT_PERMUTE. While pv and cb represent the buffer and size for the data to encode/decode, the value for fEncrypt specifies whether the input data is encoded (TRUE) or decoded (FALSE). Note that the data is encoded or decoded in place.

byte mpbbCrypt[] =
{
     65,  54,  19,  98, 168,  33, 110, 187,
    244,  22, 204,   4, 127, 100, 232,  93,
     30, 242, 203,  42, 116, 197,  94,  53,
    210, 149,  71, 158, 150,  45, 154, 136,
     76, 125, 132,  63, 219, 172,  49, 182,
     72,  95, 246, 196, 216,  57, 139, 231,
     35,  59,  56, 142, 200, 193, 223,  37,
    177,  32, 165,  70,  96,  78, 156, 251,
    170, 211,  86,  81,  69, 124,  85,   0,
      7, 201,  43, 157, 133, 155,   9, 160,
    143, 173, 179,  15,  99, 171, 137,  75,
    215, 167,  21,  90, 113, 102,  66, 191,
     38,  74, 107, 152, 250, 234, 119,  83,
    178, 112,   5,  44, 253,  89,  58, 134,
    126, 206,   6, 235, 130, 120,  87, 199,
    141,  67, 175, 180,  28, 212,  91, 205,
    226, 233,  39,  79, 195,   8, 114, 128,
    207, 176, 239, 245,  40, 109, 190,  48,
     77,  52, 146, 213,  14,  60,  34,  50,
    229, 228, 249, 159, 194, 209,  10, 129,
     18, 225, 238, 145, 131, 118, 227, 151,
    230,  97, 138,  23, 121, 164, 183, 220,
    144, 122,  92, 140,   2, 166, 202, 105,
    222,  80,  26,  17, 147, 185,  82, 135,
     88, 252, 237,  29,  55,  73,  27, 106,
    224,  41,  51, 153, 189, 108, 217, 148,
    243,  64,  84, 111, 240, 198, 115, 184,
    214,  62, 101,  24,  68,  31, 221, 103,
     16, 241,  12,  25, 236, 174,   3, 161,
     20, 123, 169,  11, 255, 248, 163, 192,
    162,   1, 247,  46, 188,  36, 104, 117,
     13, 254, 186,  47, 181, 208, 218,  61,
     20,  83,  15,  86, 179, 200, 122, 156,
    235, 101,  72,  23,  22,  21, 159,   2,
    204,  84, 124, 131,   0,  13,  12,  11,
    162,  98, 168, 118, 219, 217, 237, 199,
    197, 164, 220, 172, 133, 116, 214, 208,
    167, 155, 174, 154, 150, 113, 102, 195,
     99, 153, 184, 221, 115, 146, 142, 132,
    125, 165,  94, 209,  93, 147, 177,  87,
     81,  80, 128, 137,  82, 148,  79,  78,
     10, 107, 188, 141, 127, 110,  71,  70,
     65,  64,  68,   1,  17, 203,   3,  63,
    247, 244, 225, 169, 143,  60,  58, 249,
    251, 240,  25,  48, 130,   9,  46, 201,
    157, 160, 134,  73, 238, 111,  77, 109,
    196,  45, 129,  52,  37, 135,  27, 136,
    170, 252,   6, 161,  18,  56, 253,  76,
     66, 114, 100,  19,  55,  36, 106, 117,
    119,  67, 255, 230, 180,  75,  54,  92,
    228, 216,  53,  61,  69, 185,  44, 236,
    183,  49,  43,  41,   7, 104, 163,  14,
    105, 123,  24, 158,  33,  57, 190,  40,
     26,  91, 120, 245,  35, 202,  42, 176,
    175,  62, 254,   4, 140, 231, 229, 152,
     50, 149, 211, 246,  74, 232, 166, 234,
    233, 243, 213,  47, 112,  32, 242,  31,
      5, 103, 173,  85,  16, 206, 205, 227,
     39,  59, 218, 186, 215, 194,  38, 212,
    145,  29, 210,  28,  34,  51, 248, 250,
    241,  90, 239, 207, 144, 182, 139, 181,
    189, 192, 191,   8, 151,  30, 108, 226,
     97, 224, 198, 193,  89, 171, 187,  88,
    222,  95, 223,  96, 121, 126, 178, 138,
     71, 241, 180, 230,  11, 106, 114,  72,
    133,  78, 158, 235, 226, 248, 148,  83,
    224, 187, 160,   2, 232,  90,   9, 171,
    219, 227, 186, 198, 124, 195,  16, 221,
     57,   5, 150,  48, 245,  55,  96, 130,
    140, 201,  19,  74, 107,  29, 243, 251,
    143,  38, 151, 202, 145,  23,   1, 196,
     50,  45, 110,  49, 149, 255, 217,  35,
    209,   0,  94, 121, 220,  68,  59,  26,
     40, 197,  97,  87,  32, 144,  61, 131,
    185,  67, 190, 103, 210,  70,  66, 118,
    192, 109,  91, 126, 178,  15,  22,  41,
     60, 169,   3,  84,  13, 218,  93, 223,
    246, 183, 199,  98, 205, 141,   6, 211,
    105,  92, 134, 214,  20, 247, 165, 102,
    117, 172, 177, 233,  69,  33, 112,  12,
    135, 159, 116, 164,  34,  76, 111, 191,
     31,  86, 170,  46, 179, 120,  51,  80,
    176, 163, 146, 188, 207,  25,  28, 167,
     99, 203,  30,  77,  62,  75,  27, 155,
     79, 231, 240, 238, 173,  58, 181,  89,
      4, 234,  64,  85,  37,  81, 229, 122,
    137,  56, 104,  82, 123, 252,  39, 174,
    215, 189, 250,   7, 244, 204, 142,  95,
    239,  53, 156, 132,  43,  21, 213, 119,
     52,  73, 182,  18,  10, 127, 113, 136,
    253, 157,  24,  65, 125, 147, 216,  88,
     44, 206, 254,  36, 175, 222, 184,  54,
    200, 161, 128, 166, 153, 152, 168,  47,
     14, 129, 101, 115, 228, 194, 162, 138,
    212, 225,  17, 208,   8, 139,  42, 242,
    237, 154, 100,  63, 193, 108, 249, 236
};

#define mpbbR   (mpbbCrypt)
#define mpbbS   (mpbbCrypt + 256)
#define mpbbI   (mpbbCrypt + 512)

void CryptPermute(PVOID pv, int cb, BOOL fEncrypt)
{
   byte *          pb      = (byte *)pv;
   byte *          pbTable   = fEncrypt ? mpbbR : mpbbI;
   const DWORD *   pdw    = (const DWORD *) pv;
   DWORD         dwCurr;
   byte         b;

   if (cb >= sizeof(DWORD))
   {
      while (0 != (((DWORD_PTR) pb) % sizeof(DWORD)))
      {
         *pb = pbTable[*pb];
         pb++;
         cb--;
      }

      pdw = (const DWORD *) pb;
      for (; cb >= 4; cb -= 4)
      {
         dwCurr = *pdw;
         
         b = (byte) (dwCurr & 0xFF);
         *pb = pbTable[b];
         pb++;

         dwCurr = dwCurr >> 8;      
         b = (byte) (dwCurr & 0xFF);
         *pb = pbTable[b];
         pb++;
         
         dwCurr = dwCurr >> 8;      
         b = (byte) (dwCurr  & 0xFF);
         *pb = pbTable[b];
         pb++;
         
         dwCurr = dwCurr >> 8;      
         b = (byte) (dwCurr  & 0xFF);
         *pb = pbTable[b];
         pb++;

         pdw++;
      }

      pb = (byte *) pdw;
   }

   for (; --cb >= 0; ++pb)
      *pb = pbTable[*pb];
}
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