des.cpp

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/* des.cpp                                
 *
 * Copyright (C) 2003 Sawtooth Consulting Ltd.
 *
 * This file is part of yaSSL.
 *
 * yaSSL 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.
 *
 * yaSSL 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

/* C++ part based on Wei Dai's des.cpp from CryptoPP */
/* x86 asm is original */


#if defined(TAOCRYPT_KERNEL_MODE)
    #define DO_TAOCRYPT_KERNEL_MODE
#endif                                  // only some modules now support this


#include "runtime.hpp"
#include "des.hpp"
#include "algorithm.hpp"    // mySTL::swap


#if defined(TAOCRYPT_X86ASM_AVAILABLE) && defined(TAO_ASM)
    #define DO_DES_ASM
#endif


namespace TaoCrypt {


/* permuted choice table (key) */
static const byte pc1[] = {
       57, 49, 41, 33, 25, 17,  9,
        1, 58, 50, 42, 34, 26, 18,
       10,  2, 59, 51, 43, 35, 27,
       19, 11,  3, 60, 52, 44, 36,

       63, 55, 47, 39, 31, 23, 15,
        7, 62, 54, 46, 38, 30, 22,
       14,  6, 61, 53, 45, 37, 29,
       21, 13,  5, 28, 20, 12,  4
};

/* number left rotations of pc1 */
static const byte totrot[] = {
       1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
};

/* permuted choice key (table) */
static const byte pc2[] = {
       14, 17, 11, 24,  1,  5,
        3, 28, 15,  6, 21, 10,
       23, 19, 12,  4, 26,  8,
       16,  7, 27, 20, 13,  2,
       41, 52, 31, 37, 47, 55,
       30, 40, 51, 45, 33, 48,
       44, 49, 39, 56, 34, 53,
       46, 42, 50, 36, 29, 32
};

/* End of DES-defined tables */

/* bit 0 is left-most in byte */
static const int bytebit[] = {
       0200,0100,040,020,010,04,02,01
};

const word32 Spbox[8][64] = {
{
0x01010400,0x00000000,0x00010000,0x01010404,
0x01010004,0x00010404,0x00000004,0x00010000,
0x00000400,0x01010400,0x01010404,0x00000400,
0x01000404,0x01010004,0x01000000,0x00000004,
0x00000404,0x01000400,0x01000400,0x00010400,
0x00010400,0x01010000,0x01010000,0x01000404,
0x00010004,0x01000004,0x01000004,0x00010004,
0x00000000,0x00000404,0x00010404,0x01000000,
0x00010000,0x01010404,0x00000004,0x01010000,
0x01010400,0x01000000,0x01000000,0x00000400,
0x01010004,0x00010000,0x00010400,0x01000004,
0x00000400,0x00000004,0x01000404,0x00010404,
0x01010404,0x00010004,0x01010000,0x01000404,
0x01000004,0x00000404,0x00010404,0x01010400,
0x00000404,0x01000400,0x01000400,0x00000000,
0x00010004,0x00010400,0x00000000,0x01010004},
{
0x80108020,0x80008000,0x00008000,0x00108020,
0x00100000,0x00000020,0x80100020,0x80008020,
0x80000020,0x80108020,0x80108000,0x80000000,
0x80008000,0x00100000,0x00000020,0x80100020,
0x00108000,0x00100020,0x80008020,0x00000000,
0x80000000,0x00008000,0x00108020,0x80100000,
0x00100020,0x80000020,0x00000000,0x00108000,
0x00008020,0x80108000,0x80100000,0x00008020,
0x00000000,0x00108020,0x80100020,0x00100000,
0x80008020,0x80100000,0x80108000,0x00008000,
0x80100000,0x80008000,0x00000020,0x80108020,
0x00108020,0x00000020,0x00008000,0x80000000,
0x00008020,0x80108000,0x00100000,0x80000020,
0x00100020,0x80008020,0x80000020,0x00100020,
0x00108000,0x00000000,0x80008000,0x00008020,
0x80000000,0x80100020,0x80108020,0x00108000},
{
0x00000208,0x08020200,0x00000000,0x08020008,
0x08000200,0x00000000,0x00020208,0x08000200,
0x00020008,0x08000008,0x08000008,0x00020000,
0x08020208,0x00020008,0x08020000,0x00000208,
0x08000000,0x00000008,0x08020200,0x00000200,
0x00020200,0x08020000,0x08020008,0x00020208,
0x08000208,0x00020200,0x00020000,0x08000208,
0x00000008,0x08020208,0x00000200,0x08000000,
0x08020200,0x08000000,0x00020008,0x00000208,
0x00020000,0x08020200,0x08000200,0x00000000,
0x00000200,0x00020008,0x08020208,0x08000200,
0x08000008,0x00000200,0x00000000,0x08020008,
0x08000208,0x00020000,0x08000000,0x08020208,
0x00000008,0x00020208,0x00020200,0x08000008,
0x08020000,0x08000208,0x00000208,0x08020000,
0x00020208,0x00000008,0x08020008,0x00020200},
{
0x00802001,0x00002081,0x00002081,0x00000080,
0x00802080,0x00800081,0x00800001,0x00002001,
0x00000000,0x00802000,0x00802000,0x00802081,
0x00000081,0x00000000,0x00800080,0x00800001,
0x00000001,0x00002000,0x00800000,0x00802001,
0x00000080,0x00800000,0x00002001,0x00002080,
0x00800081,0x00000001,0x00002080,0x00800080,
0x00002000,0x00802080,0x00802081,0x00000081,
0x00800080,0x00800001,0x00802000,0x00802081,
0x00000081,0x00000000,0x00000000,0x00802000,
0x00002080,0x00800080,0x00800081,0x00000001,
0x00802001,0x00002081,0x00002081,0x00000080,
0x00802081,0x00000081,0x00000001,0x00002000,
0x00800001,0x00002001,0x00802080,0x00800081,
0x00002001,0x00002080,0x00800000,0x00802001,
0x00000080,0x00800000,0x00002000,0x00802080},
{
0x00000100,0x02080100,0x02080000,0x42000100,
0x00080000,0x00000100,0x40000000,0x02080000,
0x40080100,0x00080000,0x02000100,0x40080100,
0x42000100,0x42080000,0x00080100,0x40000000,
0x02000000,0x40080000,0x40080000,0x00000000,
0x40000100,0x42080100,0x42080100,0x02000100,
0x42080000,0x40000100,0x00000000,0x42000000,
0x02080100,0x02000000,0x42000000,0x00080100,
0x00080000,0x42000100,0x00000100,0x02000000,
0x40000000,0x02080000,0x42000100,0x40080100,
0x02000100,0x40000000,0x42080000,0x02080100,
0x40080100,0x00000100,0x02000000,0x42080000,
0x42080100,0x00080100,0x42000000,0x42080100,
0x02080000,0x00000000,0x40080000,0x42000000,
0x00080100,0x02000100,0x40000100,0x00080000,
0x00000000,0x40080000,0x02080100,0x40000100},
{
0x20000010,0x20400000,0x00004000,0x20404010,
0x20400000,0x00000010,0x20404010,0x00400000,
0x20004000,0x00404010,0x00400000,0x20000010,
0x00400010,0x20004000,0x20000000,0x00004010,
0x00000000,0x00400010,0x20004010,0x00004000,
0x00404000,0x20004010,0x00000010,0x20400010,
0x20400010,0x00000000,0x00404010,0x20404000,
0x00004010,0x00404000,0x20404000,0x20000000,
0x20004000,0x00000010,0x20400010,0x00404000,
0x20404010,0x00400000,0x00004010,0x20000010,
0x00400000,0x20004000,0x20000000,0x00004010,
0x20000010,0x20404010,0x00404000,0x20400000,
0x00404010,0x20404000,0x00000000,0x20400010,
0x00000010,0x00004000,0x20400000,0x00404010,
0x00004000,0x00400010,0x20004010,0x00000000,
0x20404000,0x20000000,0x00400010,0x20004010},
{
0x00200000,0x04200002,0x04000802,0x00000000,
0x00000800,0x04000802,0x00200802,0x04200800,
0x04200802,0x00200000,0x00000000,0x04000002,
0x00000002,0x04000000,0x04200002,0x00000802,
0x04000800,0x00200802,0x00200002,0x04000800,
0x04000002,0x04200000,0x04200800,0x00200002,
0x04200000,0x00000800,0x00000802,0x04200802,
0x00200800,0x00000002,0x04000000,0x00200800,
0x04000000,0x00200800,0x00200000,0x04000802,
0x04000802,0x04200002,0x04200002,0x00000002,
0x00200002,0x04000000,0x04000800,0x00200000,
0x04200800,0x00000802,0x00200802,0x04200800,
0x00000802,0x04000002,0x04200802,0x04200000,
0x00200800,0x00000000,0x00000002,0x04200802,
0x00000000,0x00200802,0x04200000,0x00000800,
0x04000002,0x04000800,0x00000800,0x00200002},
{
0x10001040,0x00001000,0x00040000,0x10041040,
0x10000000,0x10001040,0x00000040,0x10000000,
0x00040040,0x10040000,0x10041040,0x00041000,
0x10041000,0x00041040,0x00001000,0x00000040,
0x10040000,0x10000040,0x10001000,0x00001040,
0x00041000,0x00040040,0x10040040,0x10041000,
0x00001040,0x00000000,0x00000000,0x10040040,
0x10000040,0x10001000,0x00041040,0x00040000,
0x00041040,0x00040000,0x10041000,0x00001000,
0x00000040,0x10040040,0x00001000,0x00041040,
0x10001000,0x00000040,0x10000040,0x10040000,
0x10040040,0x10000000,0x00040000,0x10001040,
0x00000000,0x10041040,0x00040040,0x10000040,
0x10040000,0x10001000,0x10001040,0x00000000,
0x10041040,0x00041000,0x00041000,0x00001040,
0x00001040,0x00040040,0x10000000,0x10041000}
};


void BasicDES::SetKey(const byte* key, word32 /*length*/, CipherDir dir)
{
    byte buffer[56+56+8];
    byte *const pc1m = buffer;                 /* place to modify pc1 into */
    byte *const pcr = pc1m + 56;               /* place to rotate pc1 into */
    byte *const ks = pcr + 56;
    register int i,j,l;
    int m;

    for (j = 0; j < 56; j++) {          /* convert pc1 to bits of key */
        l = pc1[j] - 1;                 /* integer bit location  */
        m = l & 07;                     /* find bit              */
        pc1m[j] = (key[l >> 3] &        /* find which key byte l is in */
            bytebit[m])                 /* and which bit of that byte */
            ? 1 : 0;                    /* and store 1-bit result */
    }
    for (i = 0; i < 16; i++) {          /* key chunk for each iteration */
        memset(ks, 0, 8);               /* Clear key schedule */
        for (j = 0; j < 56; j++)        /* rotate pc1 the right amount */
            pcr[j] = pc1m[(l = j + totrot[i]) < (j < 28 ? 28 : 56) ? l: l-28];
        /* rotate left and right halves independently */
        for (j = 0; j < 48; j++){   /* select bits individually */
            /* check bit that goes to ks[j] */
            if (pcr[pc2[j] - 1]){
                /* mask it in if it's there */
                l= j % 6;
                ks[j/6] |= bytebit[l] >> 2;
            }
        }
        /* Now convert to odd/even interleaved form for use in F */
        k_[2*i] = ((word32)ks[0] << 24)
            | ((word32)ks[2] << 16)
            | ((word32)ks[4] << 8)
            | ((word32)ks[6]);
        k_[2*i + 1] = ((word32)ks[1] << 24)
            | ((word32)ks[3] << 16)
            | ((word32)ks[5] << 8)
            | ((word32)ks[7]);
    }
    
    // reverse key schedule order
    if (dir == DECRYPTION)
        for (i = 0; i < 16; i += 2) {
            mySTL::swap(k_[i],   k_[32 - 2 - i]);
            mySTL::swap(k_[i+1], k_[32 - 1 - i]);
        }
   
}

static inline void IPERM(word32& left, word32& right)
{
    word32 work;

    right = rotlFixed(right, 4U);
    work = (left ^ right) & 0xf0f0f0f0;
    left ^= work;

    right = rotrFixed(right^work, 20U);
    work = (left ^ right) & 0xffff0000;
    left ^= work;

    right = rotrFixed(right^work, 18U);
    work = (left ^ right) & 0x33333333;
    left ^= work;

    right = rotrFixed(right^work, 6U);
    work = (left ^ right) & 0x00ff00ff;
    left ^= work;

    right = rotlFixed(right^work, 9U);
    work = (left ^ right) & 0xaaaaaaaa;
    left = rotlFixed(left^work, 1U);
    right ^= work;
}

static inline void FPERM(word32& left, word32& right)
{
    word32 work;

    right = rotrFixed(right, 1U);
    work = (left ^ right) & 0xaaaaaaaa;
    right ^= work;
    left = rotrFixed(left^work, 9U);
    work = (left ^ right) & 0x00ff00ff;
    right ^= work;
    left = rotlFixed(left^work, 6U);
    work = (left ^ right) & 0x33333333;
    right ^= work;
    left = rotlFixed(left^work, 18U);
    work = (left ^ right) & 0xffff0000;
    right ^= work;
    left = rotlFixed(left^work, 20U);
    work = (left ^ right) & 0xf0f0f0f0;
    right ^= work;
    left = rotrFixed(left^work, 4U);
}


void BasicDES::RawProcessBlock(word32& lIn, word32& rIn) const
{
    word32 l = lIn, r = rIn;
    const word32* kptr = k_;

    for (unsigned i=0; i<8; i++)
    {
        word32 work = rotrFixed(r, 4U) ^ kptr[4*i+0];
        l ^= Spbox[6][(work) & 0x3f]
          ^  Spbox[4][(work >> 8) & 0x3f]
          ^  Spbox[2][(work >> 16) & 0x3f]
          ^  Spbox[0][(work >> 24) & 0x3f];
        work = r ^ kptr[4*i+1];
        l ^= Spbox[7][(work) & 0x3f]
          ^  Spbox[5][(work >> 8) & 0x3f]
          ^  Spbox[3][(work >> 16) & 0x3f]
          ^  Spbox[1][(work >> 24) & 0x3f];

        work = rotrFixed(l, 4U) ^ kptr[4*i+2];
        r ^= Spbox[6][(work) & 0x3f]
          ^  Spbox[4][(work >> 8) & 0x3f]
          ^  Spbox[2][(work >> 16) & 0x3f]
          ^  Spbox[0][(work >> 24) & 0x3f];
        work = l ^ kptr[4*i+3];
        r ^= Spbox[7][(work) & 0x3f]
          ^  Spbox[5][(work >> 8) & 0x3f]
          ^  Spbox[3][(work >> 16) & 0x3f]
          ^  Spbox[1][(work >> 24) & 0x3f];
    }

    lIn = l; rIn = r;
}


void DES::Process(byte* out, const byte* in, word32 sz)
{
    if (mode_ == ECB)
        ECB_Process(out, in, sz);
    else if (mode_ == CBC)
        if (dir_ == ENCRYPTION)
            CBC_Encrypt(out, in, sz);
        else
            CBC_Decrypt(out, in, sz);
}

typedef BlockGetAndPut<word32, BigEndian> Block;


void DES::ProcessAndXorBlock(const byte* in, const byte* xOr, byte* out) const
{
    word32 l,r;
    Block::Get(in)(l)(r);
    IPERM(l,r);

    RawProcessBlock(l, r);

    FPERM(l,r);
    Block::Put(xOr, out)(r)(l);
}


void DES_EDE2::Process(byte* out, const byte* in, word32 sz)
{
    if (mode_ == ECB)
        ECB_Process(out, in, sz);
    else if (mode_ == CBC)
        if (dir_ == ENCRYPTION)
            CBC_Encrypt(out, in, sz);
        else
            CBC_Decrypt(out, in, sz);
}

void DES_EDE2::SetKey(const byte* key, word32 sz, CipherDir dir)
{
    des1_.SetKey(key, sz, dir);
    des2_.SetKey(key + 8, sz, ReverseDir(dir));
}


void DES_EDE2::ProcessAndXorBlock(const byte* in, const byte* xOr,
                                  byte* out) const
{
    word32 l,r;
    Block::Get(in)(l)(r);
    IPERM(l,r);