#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define code code
/*..................... Words unknown by C++ .................*/
/* passerelle C51 <-> Turbo C */
#ifdef TURBOC
#define code
#define xdata
#define reentrant
#endif
static unsigned char Key[64];
static unsigned char input[64], /* data input */
output[64]; /* data output */
static unsigned char Kn[16][48];
/* ------ TABLES DE CHIFFREMENT --------- */
/* table 1 : permutation initiale */
code unsigned char T1[] = {
57,49,41,33,25,17, 9, 1,
59,51,43,35,27,19,11, 3,
61,53,45,37,29,21,13, 5,
63,55,47,39,31,23,15, 7,
56,48,40,32,24,16, 8, 0,
58,50,42,34,26,18,10, 2,
60,52,44,36,28,20,12, 4,
62,54,46,38,30,22,14, 6
};
/* table 2 : permutation finale */
code unsigned char T2[] = {
39, 7,47,15,55,23,63,31,
38, 6,46,14,54,22,62,30,
37, 5,45,13,53,21,61,29,
36, 4,44,12,52,20,60,28,
35, 3,43,11,51,19,59,27,
34, 2,42,10,50,18,58,26,
33, 1,41, 9,49,17,57,25,
32, 0,40, 8,48,16,56,24
};
/* table 3 : fonction d'expansion E ( valeur - 1 ) */
code unsigned char T3[] = {
31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9,10,11,12,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0
};
/* table 5 : fonction de permutation P */
code unsigned char T5[] = {
15, 6,19,20,
28,11,27,16,
0,14,22,25,
4,17,30, 9,
1, 7,23,13,
31,26, 2, 8,
18,12,29, 5,
21,10, 3,24
};
/* table 7 : table de choix 1 */
code unsigned char T7_1_2[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
};
/* table 8 : table de dＤalage */
code unsigned char T8[] =
{
0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0
};
/* table 9 : table de choix 2 */
code unsigned char T9[] =
{
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
};
/* table 6 : sＭection de fonctions S1 � S8 */
code unsigned char T6[][64] =
{
/* S1 */
{
14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13
},
/* S2 */
{
15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9
},
/* S3 */
{
10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12
},
/* S4 */
{
7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14
},
/* S5 */
{
2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3
},
/* S6 */
{
12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13
},
/* S7 */
{
4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12
},
/* S8 */
{
13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11
}
};
/* Table pour eclatement des valeurs precedentes */
code unsigned char TE[][4] =
{
{0,0,0,0},
{0,0,0,1},
{0,0,1,0},
{0,0,1,1},
{0,1,0,0},
{0,1,0,1},
{0,1,1,0},
{0,1,1,1},
{1,0,0,0},
{1,0,0,1},
{1,0,1,0},
{1,0,1,1},
{1,1,0,0},
{1,1,0,1},
{1,1,1,0},
{1,1,1,1}
};
/* ------ CLES ---------- */
/* ----------- Figure 3. Key Schedule Calculation. ------------ */
void Ks(unsigned char *Key, unsigned char Kn[16][48])
{
unsigned char cd[56],zt[60],tmp11, tmp12, tmp21, tmp22,*Knn;
int n,i;
/* choix 1 */
for (i = 0; i < 56; i++)
{
cd[i] = Key[T7_1_2[i]];
}
for (n = 0; n < 16; n++)
{
/* rotation � gauche du vecteur en fonction de l'indice */
if (T8[n] == 0)
{
tmp11 = cd[0];
tmp21 = cd[28];
memcpy( zt , &cd[1] , 55 );
memcpy( cd , zt , 55 );
// memmove(&cd[0], &cd[1], 55); /* ce qui est en 1 va en 0 */
cd[27] = tmp11;
cd[55] = tmp21;
}
else
{
tmp11 = cd[0];
tmp12 = cd[1];
tmp21= cd[28];
tmp22 = cd[29];
memcpy( zt , &cd[2] , 54 );
memcpy( cd , zt , 54 );
// memmove(&cd[0], &cd[2], 54); /* ce qui est en 2 va en 0 */
cd[26] = tmp11;
cd[27] = tmp12;
cd[54] = tmp21;
cd[55] = tmp22;
}
/* choix 2 */
Knn = Kn[n];
for (i = 0; i < 48; i++)
{
Knn[i] = cd[T9[i]];
}
}
}
/* --------- Figure 2. Calculation of f(R, K) ------------------ */
void fonction(unsigned char *Knn, unsigned char *r, unsigned char *s)
{
unsigned char x[32],c,t;
unsigned long *px;
int i, l;
for (i = 0, l = 0, px = (unsigned long *) x; i < 8;)
{
c = 32 * (r[T3[l]] ^ Knn[l]);
l++;
c += 8 * (r[T3[l]] ^ Knn[l]);
l++;
c += 4 * (r[T3[l]] ^ Knn[l]);
l++;
c += 2 * (r[T3[l]] ^ Knn[l]);
l++;
c += 1 * (r[T3[l]] ^ Knn[l]);
l++;
c += 16 * (r[T3[l]] ^ Knn[l]);
l++;
/* extraction de la valeur */
t = T6[i][c];
i++;
/* Eclatement de la valeur; 4 bits -> 4 bytes */
*px = *(long *)TE[t];
px++;
}
/* fonction P */
for (i = 0; i < 32; i++)
{
s[i] = x[T5[i]];
}
}
/* --------- Permutations initiale et finale ------------------- */
void permutation(unsigned char *org, unsigned char *tab)
{
unsigned char tmp[64];
int i;
memcpy(tmp, org, 64);
for (i = 0; i < 64; i++)
{
org[i] = tmp[tab[i]];
}
}
/* ------------ Figure 1. Enciphering Computation. ------------- */
void chiffrement(unsigned char *xi, unsigned char *xo, unsigned char Kn[16][48])
{
unsigned char r[32], l[32],rp[32], lp[32];
int i,n;
memcpy(l, &xi[0], 32);
memcpy(r, &xi[32], 32);
for (n = 0; n < 16; n++)
{
memcpy(lp, r, 32);
fonction(Kn[n], r, rp);
for (i = 0; i < 32; i++)
{
r[i] =( ( l[i]) ^ (rp[i] ) ) ;
}
memcpy(l, lp, 32);
}
memcpy(&xo[0], r, 32);
memcpy(&xo[32], l, 32);
}
/* ----------- Deciphering Computation. ----------------------- */
void dechiffrement(unsigned char *xi, unsigned char *xo, unsigned char Kn[16][48])
{
unsigned char r[32], l[32], rp[32], lp[32];
int i,n;
memcpy(l, &xi[0], 32);
memcpy(r, &xi[32], 32);
for (n = 0; n < 16; n++)
{
memcpy(lp, r, 32);
fonction(Kn[15 - n], r, rp);
for (i = 0; i < 32; i++)
{
r[i] =( ( l[i] ) ^ ( rp[i] )) ;
}
memcpy(l, lp, 32);
}
memcpy(&xo[0], r, 32);
memcpy(&xo[32], l, 32);
}
/* ------------- Eclater 64 bits en 64 octets ---------------- */
void eclater(unsigned char *buf_bit, unsigned char *byte)
{
int i;
unsigned char m;
for (i = 0; i < 8; i++)
{
for (m = 0x80; m != 0; ) // m >>= 1)
{
if ((buf_bit[i] & m) != 0)
*byte = 1;
else
*byte = 0;
