Logo Search packages:      
Sourcecode: calibre version File versions  Download package

des.c
/* D3DES (V5.09) - 
 *
 * A portable, public domain, version of the Data Encryption Standard.
 *
 * Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.
 * Thanks to: Dan Hoey for his excellent Initial and Inverse permutation
 * code;  Jim Gillogly & Phil Karn for the DES key schedule code; Dennis
 * Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,
 * for humouring me on. 
 *
 * THIS SOFTWARE PLACED IN THE PUBLIC DOMAIN BY THE AUTHOUR
 * 920825 19:42 EDST
 *
 * Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.
 * (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.
 */
 
#include "d3des.h"
 
static void scrunch(unsigned char *, unsigned long *);
static void unscrun(unsigned long *, unsigned char *);
static void desfunc(unsigned long *, unsigned long *);
static void cookey(unsigned long *);
 
static unsigned long KnL[32] = { 0L };
/*
static unsigned long KnR[32] = { 0L };
static unsigned long Kn3[32] = { 0L };
static unsigned char Df_Key[24] = {
      0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
      0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
      0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67 };
*/
 
static unsigned short bytebit[8]    = {
      0200, 0100, 040, 020, 010, 04, 02, 01 };
 
static unsigned long bigbyte[24] = {
      0x800000L,  0x400000L,  0x200000L,  0x100000L,
      0x80000L,   0x40000L,   0x20000L,   0x10000L,
      0x8000L,    0x4000L,    0x2000L,    0x1000L,
      0x800L,           0x400L,           0x200L,           0x100L,
      0x80L,            0x40L,            0x20L,            0x10L,
      0x8L,       0x4L,       0x2L,       0x1L  };
 
/* Use the key schedule specified in the Standard (ANSI X3.92-1981). */
 
static unsigned char pc1[56] = {
      56, 48, 40, 32, 24, 16,  8,    0, 57, 49, 41, 33, 25, 17,
       9,  1, 58, 50, 42, 34, 26,   18, 10,  2, 59, 51, 43, 35,
      62, 54, 46, 38, 30, 22, 14,    6, 61, 53, 45, 37, 29, 21,
      13,  5, 60, 52, 44, 36, 28,   20, 12,  4, 27, 19, 11,  3 };
 
static unsigned char totrot[16] = {
      1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28 };
 
static unsigned char pc2[48] = {
      13, 16, 10, 23,  0,  4,  2, 27, 14,  5, 20,  9,
      22, 18, 11,  3, 25,  7, 15,  6, 26, 19, 12,  1,
      40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
      43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };
 
void deskey(key, edf)   /* Thanks to James Gillogly & Phil Karn! */
unsigned char *key;
short edf;
{
      int i, j, l, m, n;
      unsigned char pc1m[56], pcr[56];
      unsigned long kn[32];
 
      for ( j = 0; j < 56; j++ ) {
            l = pc1[j];
            m = l & 07;
            pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1 : 0;
            }
      for( i = 0; i < 16; i++ ) {
            if( edf == DE1 ) m = (15 - i) << 1;
            else m = i << 1;
            n = m + 1;
            kn[m] = kn[n] = 0L;
            for( j = 0; j < 28; j++ ) {
                  l = j + totrot[i];
                  if( l < 28 ) pcr[j] = pc1m[l];
                  else pcr[j] = pc1m[l - 28];
                  }
            for( j = 28; j < 56; j++ ) {
                l = j + totrot[i];
                if( l < 56 ) pcr[j] = pc1m[l];
                else pcr[j] = pc1m[l - 28];
                }
            for( j = 0; j < 24; j++ ) {
                  if( pcr[pc2[j]] ) kn[m] |= bigbyte[j];
                  if( pcr[pc2[j+24]] ) kn[n] |= bigbyte[j];
                  }
            }
      cookey(kn);
      return;
      }
 
static void cookey(raw1)
unsigned long *raw1;
{
      unsigned long *cook, *raw0;
      unsigned long dough[32];
      int i;
 
      cook = dough;
      for( i = 0; i < 16; i++, raw1++ ) {
            raw0 = raw1++;
            *cook  = (*raw0 & 0x00fc0000L) << 6;
            *cook |= (*raw0 & 0x00000fc0L) << 10;
            *cook |= (*raw1 & 0x00fc0000L) >> 10;
            *cook++     |= (*raw1 & 0x00000fc0L) >> 6;
            *cook  = (*raw0 & 0x0003f000L) << 12;
            *cook |= (*raw0 & 0x0000003fL) << 16;
            *cook |= (*raw1 & 0x0003f000L) >> 4;
            *cook++     |= (*raw1 & 0x0000003fL);
            }
      usekey(dough);
      return;
      }
 
void cpkey(into)
unsigned long *into;
{
      unsigned long *from, *endp;
 
      from = KnL, endp = &KnL[32];
      while( from < endp ) *into++ = *from++;
      return;
      }
 
void usekey(from)
unsigned long *from;
{
      unsigned long *to, *endp;
 
      to = KnL, endp = &KnL[32];
      while( to < endp ) *to++ = *from++;
      return;
      }
 
void des(inblock, outblock)
unsigned char *inblock, *outblock;
{
      unsigned long work[2];
 
      scrunch(inblock, work);
      desfunc(work, KnL);
      unscrun(work, outblock);
      return;
      }
 

static void scrunch(outof, into)
unsigned char *outof;
unsigned long *into;
{
      *into        = (*outof++ & 0xffL) << 24;
      *into       |= (*outof++ & 0xffL) << 16;
      *into       |= (*outof++ & 0xffL) << 8;
      *into++ |= (*outof++ & 0xffL);
      *into        = (*outof++ & 0xffL) << 24;
      *into       |= (*outof++ & 0xffL) << 16;
      *into       |= (*outof++ & 0xffL) << 8;
      *into |= (*outof   & 0xffL);
      return;
      }

 
static void unscrun(outof, into)
unsigned long *outof;
unsigned char *into;
{
      *into++ = (*outof >> 24) & 0xffL;
      *into++ = (*outof >> 16) & 0xffL;
      *into++ = (*outof >>  8) & 0xffL;
      *into++ =  *outof++      & 0xffL;
      *into++ = (*outof >> 24) & 0xffL;
      *into++ = (*outof >> 16) & 0xffL;
      *into++ = (*outof >>  8) & 0xffL;
      *into   =  *outof  & 0xffL;
      return;
      }

#include "spr.h"
/* 
static unsigned long SP1[64] = {
      0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,
      0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,
      0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,
      0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,
      0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,
      0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,
      0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,
      0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,
      0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,
      0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,
      0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,
      0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,
      0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,
      0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,
      0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,
      0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L };
 
static unsigned long SP2[64] = {
      0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
      0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
      0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
      0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,
      0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,
      0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,
      0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,
      0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,
      0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,
      0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,
      0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,
      0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,
      0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,
      0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,
      0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,
      0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L };
 
static unsigned long SP3[64] = {
      0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,
      0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,
      0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,
      0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,
      0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,
      0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,
      0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,
      0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,
      0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,
      0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,
      0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,
      0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,
      0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,
      0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,
      0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,
      0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L };
 
static unsigned long SP4[64] = {
      0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
      0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,
      0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,
      0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,
      0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,
      0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,
      0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,
      0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,
      0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,
      0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,
      0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,
      0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
      0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,
      0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,
      0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,
      0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L };
 
static unsigned long SP5[64] = {
      0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,
      0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,
      0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,
      0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,
      0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,
      0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,
      0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,
      0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,
      0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,
      0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,
      0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,
      0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,
      0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,
      0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,
      0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,
      0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L };
 
static unsigned long SP6[64] = {
      0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,
      0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,
      0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,
      0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,
      0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,
      0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,
      0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,
      0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,
      0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,
      0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,
      0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,
      0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,
      0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,
      0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,
      0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,
      0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L };
 
static unsigned long SP7[64] = {
      0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
      0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
      0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
      0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
      0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
      0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
      0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
      0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
      0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
      0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
      0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
      0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
      0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
      0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
      0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
      0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };
 
static unsigned long SP8[64] = {
      0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
      0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
      0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
      0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
      0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
      0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
      0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
      0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
      0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
      0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
      0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
      0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
      0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
      0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
      0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
      0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };
*/

 
static void desfunc(block, keys)
unsigned long *block, *keys;
{
      unsigned long fval, work, right, leftt;
      int round;
      
      leftt = block[0];
      right = block[1];
      work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
      right ^= work;
      leftt ^= (work << 4);
      work = ((leftt >> 16) ^ right) & 0x0000ffffL;
      right ^= work;
      leftt ^= (work << 16);
      work = ((right >> 2) ^ leftt) & 0x33333333L;
      leftt ^= work;
      right ^= (work << 2);
      work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
      leftt ^= work;
      right ^= (work << 8);
      right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
      work = (leftt ^ right) & 0xaaaaaaaaL;
      leftt ^= work;
      right ^= work;
      leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;
      
      for( round = 0; round < 8; round++ ) {
            work  = (right << 28) | (right >> 4);
            work ^= *keys++;
            fval  = SP7[ work        & 0x3fL];
            fval |= SP5[(work >>  8) & 0x3fL];
            fval |= SP3[(work >> 16) & 0x3fL];
            fval |= SP1[(work >> 24) & 0x3fL];
            work  = right ^ *keys++;
            fval |= SP8[ work        & 0x3fL];
            fval |= SP6[(work >>  8) & 0x3fL];
            fval |= SP4[(work >> 16) & 0x3fL];
            fval |= SP2[(work >> 24) & 0x3fL];
            leftt ^= fval;
            work  = (leftt << 28) | (leftt >> 4);
            work ^= *keys++;
            fval  = SP7[ work        & 0x3fL];
            fval |= SP5[(work >>  8) & 0x3fL];
            fval |= SP3[(work >> 16) & 0x3fL];
            fval |= SP1[(work >> 24) & 0x3fL];
            work  = leftt ^ *keys++;
            fval |= SP8[ work        & 0x3fL];
            fval |= SP6[(work >>  8) & 0x3fL];
            fval |= SP4[(work >> 16) & 0x3fL];
            fval |= SP2[(work >> 24) & 0x3fL];
            right ^= fval;
            }
            
      right = (right << 31) | (right >> 1);
      work = (leftt ^ right) & 0xaaaaaaaaL;
      leftt ^= work;
      right ^= work;
      leftt = (leftt << 31) | (leftt >> 1);
      work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
      right ^= work;
      leftt ^= (work << 8);
      work = ((leftt >> 2) ^ right) & 0x33333333L;
      right ^= work;
      leftt ^= (work << 2);
      work = ((right >> 16) ^ leftt) & 0x0000ffffL;
      leftt ^= work;
      right ^= (work << 16);
      work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
      leftt ^= work;
      right ^= (work << 4);
      *block++ = right;
      *block = leftt;
      return;
      }
 
#ifdef D2_DES
 
void des2key(hexkey, mode)          /* stomps on Kn3 too */
unsigned char *hexkey;              /* unsigned char[16] */
short mode;
{
      short revmod;
 
      revmod = (mode == EN0) ? DE1 : EN0;
      deskey(&hexkey[8], revmod);
      cpkey(KnR);
      deskey(hexkey, mode);
      cpkey(Kn3);                         /* Kn3 = KnL */
      return;
      }
      
void Ddes(from, into)
unsigned char *from, *into;         /* unsigned char[8] */
{
      unsigned long work[2];
 
      scrunch(from, work);
      desfunc(work, KnL);
      desfunc(work, KnR);
      desfunc(work, Kn3);
      unscrun(work, into);
      return;
      }
 
void D2des(from, into)
unsigned char *from;                /* unsigned char[16] */
unsigned char *into;                /* unsigned char[16] */
{
      unsigned long *right, *l1, swap;
      unsigned long leftt[2], bufR[2];
      
      right = bufR;
      l1 = &leftt[1];
      scrunch(from, leftt);
      scrunch(&from[8], right);
      desfunc(leftt, KnL);
      desfunc(right, KnL);
      swap = *l1;
      *l1 = *right;
      *right = swap;
      desfunc(leftt, KnR);
      desfunc(right, KnR);
      swap = *l1;
      *l1 = *right;
      *right = swap;
      desfunc(leftt, Kn3);
      desfunc(right, Kn3);
      unscrun(leftt, into);
      unscrun(right, &into[8]);
      return;
      }
 
void makekey(aptr, kptr)
char *aptr;                   /* NULL-terminated  */
unsigned char *kptr;          /* unsigned char[8] */
{
      unsigned char *store;
      int first, i;
      unsigned long savek[96];
 
      cpDkey(savek);
      des2key(Df_Key, EN0);
      for( i = 0; i < 8; i++ ) kptr[i] = Df_Key[i];
      first = 1;
      while( (*aptr != '\0') || first ) {
            store = kptr;
            for( i = 0; i < 8 && (*aptr != '\0'); i++ ) {
                  *store++ ^= *aptr & 0x7f;
                  *aptr++ = '\0';
                  }
            Ddes(kptr, kptr);
            first = 0;
            }
      useDkey(savek);
      return;
      }
 
void make2key(aptr, kptr)
char *aptr;                   /* NULL-terminated   */
unsigned char *kptr;          /* unsigned char[16] */
{
      unsigned char *store;
      int first, i;
      unsigned long savek[96];
 
      cpDkey(savek);
      des2key(Df_Key, EN0);
      for( i = 0; i < 16; i++ ) kptr[i] = Df_Key[i];
      first = 1;
      while( (*aptr != '\0') || first ) {
            store = kptr;
            for( i = 0; i < 16 && (*aptr != '\0'); i++ ) {
                  *store++ ^= *aptr & 0x7f;
                  *aptr++ = '\0';
                  }
            D2des(kptr, kptr);
            first = 0;
            }
      useDkey(savek);
      return;
      }
 
#ifndef D3_DES    /* D2_DES only */
 
void cp2key(into)
unsigned long *into;    /* unsigned long[64] */
{
      unsigned long *from, *endp;
 
      cpkey(into);
      into = &into[32];
      from = KnR, endp = &KnR[32];
      while( from < endp ) *into++ = *from++;
      return;
      }
 
void use2key(from)                        /* stomps on Kn3 too */
unsigned long *from;    /* unsigned long[64] */
{
      unsigned long *to, *endp;
 
      usekey(from);
      from = &from[32];
      to = KnR, endp = &KnR[32];
      while( to < endp ) *to++ = *from++;
      cpkey(Kn3);                         /* Kn3 = KnL */
      return;
      }
 
#else /* D3_DES too */
 
void des3key(hexkey, mode)
unsigned char *hexkey;              /* unsigned char[24] */
short mode;
{
      unsigned char *first, *third;
      short revmod;
 
      if( mode == EN0 ) {
            revmod = DE1;
            first = hexkey;
            third = &hexkey[16];
            }
      else {
            revmod = EN0;
            first = &hexkey[16];
            third = hexkey;
            }
      deskey(&hexkey[8], revmod);
      cpkey(KnR);
      deskey(third, mode);
      cpkey(Kn3);
      deskey(first, mode);
      return;
      }
 
void cp3key(into)
unsigned long *into;    /* unsigned long[96] */
{
      unsigned long *from, *endp;
 
      cpkey(into);
      into = &into[32];
      from = KnR, endp = &KnR[32];
      while( from < endp ) *into++ = *from++;
      from = Kn3, endp = &Kn3[32];
      while( from < endp ) *into++ = *from++;
      return;
      }
 
void use3key(from)
unsigned long *from;    /* unsigned long[96] */
{
      unsigned long *to, *endp;
 
      usekey(from);
      from = &from[32];
      to = KnR, endp = &KnR[32];
      while( to < endp ) *to++ = *from++;
      to = Kn3, endp = &Kn3[32];
      while( to < endp ) *to++ = *from++;
      return;
      }
 
static void D3des(unsigned char *, unsigned char *);
 
static void D3des(from, into) /* amateur theatrics */
unsigned char *from;                /* unsigned char[24] */
unsigned char *into;                /* unsigned char[24] */
{
      unsigned long swap, leftt[2], middl[2], right[2];
      
      scrunch(from, leftt);
      scrunch(&from[8], middl);
      scrunch(&from[16], right);
      desfunc(leftt, KnL);
      desfunc(middl, KnL);
      desfunc(right, KnL);
      swap = leftt[1];
      leftt[1] = middl[0];
      middl[0] = swap;
      swap = middl[1];
      middl[1] = right[0];
      right[0] = swap;
      desfunc(leftt, KnR);
      desfunc(middl, KnR);
      desfunc(right, KnR);
      swap = leftt[1];
      leftt[1] = middl[0];
      middl[0] = swap;
      swap = middl[1];
      middl[1] = right[0];
      right[0] = swap;
      desfunc(leftt, Kn3);
      desfunc(middl, Kn3);
      desfunc(right, Kn3);
      unscrun(leftt, into);
      unscrun(middl, &into[8]);
      unscrun(right, &into[16]);
      return;
      }     
      
void make3key(aptr, kptr)
char *aptr;                   /* NULL-terminated   */
unsigned char *kptr;          /* unsigned char[24] */
{
      unsigned char *store;
      int first, i;
      unsigned long savek[96];
 
      cp3key(savek);
      des3key(Df_Key, EN0);
      for( i = 0; i < 24; i++ ) kptr[i] = Df_Key[i];
      first = 1;
      while( (*aptr != '\0') || first ) {
            store = kptr;
            for( i = 0; i < 24 && (*aptr != '\0'); i++ ) {
                  *store++ ^= *aptr & 0x7f;
                  *aptr++ = '\0';
                  }
            D3des(kptr, kptr);
            first = 0;
            }
      use3key(savek);
      return;
      }
 
#endif      /* D3_DES */
#endif      /* D2_DES */
 
/* Validation sets:
 *
 * Single-length key, single-length plaintext -
 * Key    : 0123 4567 89ab cdef
 * Plain  : 0123 4567 89ab cde7
 * Cipher : c957 4425 6a5e d31d
 *
 * Double-length key, single-length plaintext -
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210
 * Plain  : 0123 4567 89ab cde7
 * Cipher : 7f1d 0a77 826b 8aff
 *
 * Double-length key, double-length plaintext -
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff
 * Cipher : 27a0 8440 406a df60 278f 47cf 42d6 15d7
 *
 * Triple-length key, single-length plaintext -
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567
 * Plain  : 0123 4567 89ab cde7
 * Cipher : de0b 7c06 ae5e 0ed5
 *
 * Triple-length key, double-length plaintext -
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff
 * Cipher : ad0d 1b30 ac17 cf07 0ed1 1c63 81e4 4de5
 *
 * d3des V5.09 rwo 9208.04 20:31 Graven Imagery
 **********************************************************************/
 

Generated by  Doxygen 1.6.0   Back to index