cast5.c

   1 /*
   2  * File:        cast5.c
   3  * Author:      Daniel Otte
   4  * Date:        26.07.2006
   5  * License: GPL
   6  * Description: Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
   7  *
   8  */
   9  //pgm_read_dword
  10
  11  #include <stdint.h>
  12  #include <string.h>
  13  #include "cast5.h"
  14  #include "config.h"
  15  #include "uart.h"
  16  #include "debug.h"
  17
  18  #undef DEBUG
  19
  20 #include "cast5-sbox.h"
  21
  22
  23
  24 #define S5(x) pgm_read_dword(&s5[(x)])
  25 #define S6(x) pgm_read_dword(&s6[(x)])
  26 #define S7(x) pgm_read_dword(&s7[(x)])
  27 #define S8(x) pgm_read_dword(&s8[(x)])
  28
  29
  30 void cast5_init_A(uint8_t *dest, uint8_t *src, bool bmode){
  31         uint8_t mask = bmode?0x8:0;
  32         *((uint32_t*)(&dest[0x0])) = *((uint32_t*)(&src[0x0^mask])) ^ S5(src[0xD^mask]) ^ S6(src[0xF^mask]) ^ S7(src[0xC^mask]) ^ S8(src[0xE^mask]) ^ S7(src[0x8^mask]);
  33         *((uint32_t*)(&dest[0x4])) = *((uint32_t*)(&src[0x8^mask])) ^ S5(dest[0x0]) ^ S6(dest[0x2]) ^ S7(dest[0x1]) ^ S8(dest[0x3]) ^ S8(src[0xA^mask]);
  34         *((uint32_t*)(&dest[0x8])) = *((uint32_t*)(&src[0xC^mask])) ^ S5(dest[0x7]) ^ S6(dest[0x6]) ^ S7(dest[0x5]) ^ S8(dest[0x4]) ^ S5(src[0x9^mask]);
  35         *((uint32_t*)(&dest[0xC])) = *((uint32_t*)(&src[0x4^mask])) ^ S5(dest[0xA]) ^ S6(dest[0x9]) ^ S7(dest[0xB]) ^ S8(dest[0x8]) ^ S6(src[0xB^mask]);
  36 }
  37
  38 void cast5_init_M(uint8_t *dest, uint8_t *src, bool nmode, bool xmode){
  39         uint8_t nmt[] = {0xB, 0xA, 0x9, 0x8, 0xF, 0xE, 0xD, 0xC, 0x3, 0x2, 0x1, 0x0, 0x7, 0x6, 0x5, 0x4}; /* nmode table */
  40         uint8_t xmt[4][4] = {{0x2, 0x6, 0x9, 0xC}, {0x8, 0xD, 0x3, 0x7}, {0x3, 0x7, 0x8, 0xD}, {0x9, 0xC, 0x2, 0x6}};
  41         #define NMT(x) (src[nmode?nmt[(x)]:(x)])
  42         #define XMT(x) (src[xmt[(xmode<<1) + nmode][(x)]])
  43         *((uint32_t*)(&dest[0x0])) = S5(NMT(0x8)) ^ S6(NMT(0x9)) ^ S7(NMT(0x7)) ^ S8(NMT(0x6)) ^ S5(XMT(0));
  44         *((uint32_t*)(&dest[0x4])) = S5(NMT(0xA)) ^ S6(NMT(0xB)) ^ S7(NMT(0x5)) ^ S8(NMT(0x4)) ^ S6(XMT(1));
  45         *((uint32_t*)(&dest[0x8])) = S5(NMT(0xC)) ^ S6(NMT(0xD)) ^ S7(NMT(0x3)) ^ S8(NMT(0x2)) ^ S7(XMT(2));
  46         *((uint32_t*)(&dest[0xC])) = S5(NMT(0xE)) ^ S6(NMT(0xF)) ^ S7(NMT(0x1)) ^ S8(NMT(0x0)) ^ S8(XMT(3));
  47 }
  48
  49 #define S5B(x) pgm_read_byte(3+(uint8_t*)(&s5[(x)]))
  50 #define S6B(x) pgm_read_byte(3+(uint8_t*)(&s6[(x)]))
  51 #define S7B(x) pgm_read_byte(3+(uint8_t*)(&s7[(x)]))
  52 #define S8B(x) pgm_read_byte(3+(uint8_t*)(&s8[(x)]))
  53
  54 void cast5_init_rM(uint8_t *klo, uint8_t *khi, uint8_t offset, uint8_t *src, bool nmode, bool xmode){
  55         uint8_t nmt[] = {0xB, 0xA, 0x9, 0x8, 0xF, 0xE, 0xD, 0xC, 0x3, 0x2, 0x1, 0x0, 0x7, 0x6, 0x5, 0x4}; /* nmode table */
  56         uint8_t xmt[4][4] = {{0x2, 0x6, 0x9, 0xC}, {0x8, 0xD, 0x3, 0x7}, {0x3, 0x7, 0x8, 0xD}, {0x9, 0xC, 0x2, 0x6}};
  57         uint8_t t, h=0;
  58         t = S5B(NMT(0x8)) ^ S6B(NMT(0x9)) ^ S7B(NMT(0x7)) ^ S8B(NMT(0x6)) ^ S5B(XMT(0));
  59                 klo[offset*2] |= (t & 0x0f);
  60                 h |= (t&0x10); h>>=1;
  61         t = S5B(NMT(0xA)) ^ S6B(NMT(0xB)) ^ S7B(NMT(0x5)) ^ S8B(NMT(0x4)) ^ S6B(XMT(1));
  62                 klo[offset*2] |= (t<<4) & 0xf0;
  63                 h |= t&0x10; h>>=1;
  64         t = S5B(NMT(0xC)) ^ S6B(NMT(0xD)) ^ S7B(NMT(0x3)) ^ S8B(NMT(0x2)) ^ S7B(XMT(2));
  65                 klo[offset*2+1] |= t&0xf;
  66                 h |= t&0x10; h>>=1;
  67         t = S5B(NMT(0xE)) ^ S6B(NMT(0xF)) ^ S7B(NMT(0x1)) ^ S8B(NMT(0x0)) ^ S8B(XMT(3));
  68                 klo[offset*2+1] |= t<<4;
  69                 h |= t&0x10; h >>=1;
  70         #ifdef DEBUG
  71                 uart_putstr("\r\n\t h="); uart_hexdump(&h,1);
  72         #endif
  73         khi[offset>>1] |= h<<((offset&0x1)?4:0);
  74 }
  75
  76 #define S_5X(s) pgm_read_dword(&s5[BPX[(s)]])
  77 #define S_6X(s) pgm_read_dword(&s6[BPX[(s)]])
  78 #define S_7X(s) pgm_read_dword(&s7[BPX[(s)]])
  79 #define S_8X(s) pgm_read_dword(&s8[BPX[(s)]])
  80
  81 #define S_5Z(s) pgm_read_dword(&s5[BPZ[(s)]])
  82 #define S_6Z(s) pgm_read_dword(&s6[BPZ[(s)]])
  83 #define S_7Z(s) pgm_read_dword(&s7[BPZ[(s)]])
  84 #define S_8Z(s) pgm_read_dword(&s8[BPZ[(s)]])
  85
  86
  87
  88
  89 void cast5_init(cast5_ctx_t* s, uint8_t* key, uint8_t keylength){
  90          /* we migth return if the key is valid and if setup was sucessfull */
  91         uint32_t x[4], z[4];
  92         #define BPX ((uint8_t*)&(x[0]))
  93         #define BPZ ((uint8_t*)&(z[0]))
  94         s->shortkey = (keylength<=80);
  95         /* littel endian only! */
  96         memset(&(x[0]), 0 ,16); /* set x to zero */
  97         memcpy(&(x[0]), key, keylength/8);
  98
  99
 100         /* todo: merge a and b and compress the whole stuff */
 101         /***** A *****/
 102         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 103         /***** M *****/
 104         cast5_init_M((uint8_t*)(&(s->mask[0])), (uint8_t*)(&z[0]), false, false);
 105         /***** B *****/
 106         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 107         /***** N *****/
 108         cast5_init_M((uint8_t*)(&(s->mask[4])), (uint8_t*)(&x[0]), true, false);
 109         /***** A *****/
 110         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 111         /***** N' *****/
 112         cast5_init_M((uint8_t*)(&(s->mask[8])), (uint8_t*)(&z[0]), true, true);
 113         /***** B *****/
 114         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 115         /***** M' *****/
 116         cast5_init_M((uint8_t*)(&(s->mask[12])), (uint8_t*)(&x[0]), false, true);
 117
 118         /* that were the masking keys, now the rotation keys */
 119         /* set the keys to zero */
 120         memset(&(s->rotl[0]),0,8);
 121         s->roth[0]=s->roth[1]=0;
 122         /***** A *****/
 123         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 124         /***** M *****/
 125         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 0, (uint8_t*)(&z[0]), false, false);
 126         /***** B *****/
 127         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 128         /***** N *****/
 129         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 1, (uint8_t*)(&x[0]), true, false);
 130         /***** A *****/
 131         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 132         /***** N' *****/
 133         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 2, (uint8_t*)(&z[0]), true, true);
 134         /***** B *****/
 135         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 136         /***** M' *****/
 137         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 3, (uint8_t*)(&x[0]), false, true);
 138         /* done ;-) */
 139 }
 140
 141
 142
 143 /********************************************************************************************************/
 144
 145 #define ROTL32(a,n) ((a)<<(n) | (a)>>(32-(n)))
 146 #define CHANGE_ENDIAN32(x) ((x)<<24 | (x)>>24 | ((x)&0xff00)<<8 | ((x)&0xff0000)>>8 )
 147
 148 typedef uint32_t cast5_f_t(uint32_t,uint32_t,uint8_t);
 149
 150 #define IA 3
 151 #define IB 2
 152 #define IC 1
 153 #define ID 0
 154
 155
 156 uint32_t cast5_f1(uint32_t d, uint32_t m, uint8_t r){
 157         uint32_t t;
 158         t = ROTL32((d + m),r);
 159 #ifdef DEBUG
 160         uint32_t ia,ib,ic,id;
 161         uart_putstr("\r\n f1("); uart_hexdump(&d, 4); uart_putc(',');
 162                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 163                 uart_hexdump(&t, 4);
 164         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 165         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 166         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 167         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 168         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 169         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 170         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 171         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 172
 173         return (((ia ^ ib) - ic) + id);
 174
 175 #else
 176
 177         return (((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) ^ pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 178                 - pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) + pgm_read_dword(&s4[((uint8_t*)&t)[ID]]));
 179
 180 #endif
 181 }
 182
 183
 184 uint32_t cast5_f2(uint32_t d, uint32_t m, uint8_t r){
 185         uint32_t t;
 186         t = ROTL32((d ^ m),r);
 187 #ifdef DEBUG
 188         uint32_t ia,ib,ic,id;
 189         uart_putstr("\r\n f2("); uart_hexdump(&d, 4); uart_putc(',');
 190                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 191                 uart_hexdump(&t, 4);
 192
 193         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 194         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 195         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 196         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 197
 198         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 199         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 200         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 201         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 202
 203         return (((ia - ib) + ic) ^ id);
 204 #else
 205
 206         return (((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) - pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 207                 + pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) ^ pgm_read_dword(&s4[((uint8_t*)&t)[ID]]));
 208
 209 #endif
 210 }
 211
 212 uint32_t cast5_f3(uint32_t d, uint32_t m, uint8_t r){
 213         uint32_t t;
 214         t = ROTL32((m - d),r);
 215
 216 #ifdef DEBUG
 217         uint32_t ia,ib,ic,id;
 218
 219         uart_putstr("\r\n f3("); uart_hexdump(&d, 4); uart_putc(',');
 220                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 221                 uart_hexdump(&t, 4);
 222
 223         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 224         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 225         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 226         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 227
 228         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 229         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 230         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 231         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 232         return (((ia + ib) ^ ic) - id);
 233 #else
 234         return ((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) + pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 235                 ^ pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) - pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 236
 237 #endif
 238 }
 239
 240
 241
 242 void cast5_enc(cast5_ctx_t *s, void* block){
 243         uint32_t l,r, x, y;
 244         uint8_t i;
 245         cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};
 246         l=((uint32_t*)block)[0];
 247         r=((uint32_t*)block)[1];
 248 //      uart_putstr("\r\n round[-1] = ");
 249 //      uart_hexdump(&r, 4);
 250         for (i=0;i<(s->shortkey?12:16);++i){
 251                 x = r;
 252                 y = (f[i%3])(CHANGE_ENDIAN32(r), CHANGE_ENDIAN32(s->mask[i]),
 253                         (((s->roth[i>>3]) & (1<<(i&0x7)))?0x10:0x00)
 254                          + ( ((s->rotl[i>>1])>>((i&1)?4:0)) & 0x0f) );
 255                 r = l ^ CHANGE_ENDIAN32(y);
 256 //              uart_putstr("\r\n round["); DEBUG_B(i); uart_putstr("] = ");
 257 //              uart_hexdump(&r, 4);
 258                 l = x;
 259         }
 260         ((uint32_t*)block)[0]=r;
 261         ((uint32_t*)block)[1]=l;
 262 }
 263
 264
 265 void cast5_dec(cast5_ctx_t *s, void* block){
 266         uint32_t l,r, x, y;
 267         int8_t i, rounds;
 268         cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};
 269         l=((uint32_t*)block)[0];
 270         r=((uint32_t*)block)[1];
 271         rounds = (s->shortkey?12:16);
 272         for (i=rounds-1; i>=0 ;--i){
 273                 x = r;
 274                 y = (f[i%3])(CHANGE_ENDIAN32(r), CHANGE_ENDIAN32(s->mask[i]),
 275                         (((s->roth[i>>3]) & (1<<(i&0x7)))?0x10:0x00)
 276                          + ( ((s->rotl[i>>1])>>((i&1)?4:0)) & 0x0f) );
 277                 r = l ^ CHANGE_ENDIAN32(y);
 278                 l = x;
 279         }
 280         ((uint32_t*)block)[0]=r;
 281         ((uint32_t*)block)[1]=l;
 282 }
 283
 284
 285 /*********************************************************************************************************/
 286 /*********************************************************************************************************/
 287 /*********************************************************************************************************/
 288
 289 #if 0
 290
 291 void cast5_old_init(cast5_ctx_t* s, uint8_t* key, uint8_t keylength){
 292          /* we migth return if the key is valid and if setup was sucessfull */
 293         uint32_t x[4], z[4], t;
 294         #define BPX ((uint8_t*)&(x[0]))
 295         #define BPZ ((uint8_t*)&(z[0]))
 296         s->shortkey = (keylength<=80);
 297         /* littel endian only! */
 298         memset(&(x[0]), 0 ,16); /* set x to zero */
 299         memcpy(&(x[0]), key, keylength/8);
 300
 301
 302         /* todo: merge a and b and compress the whole stuff */
 303         /***** A *****/
 304         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 305         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 306         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 307         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 308         /***** M *****/
 309         s->mask[0] = S_5Z(0x8) ^ S_6Z(0x9) ^ S_7Z(0x7) ^ S_8Z(0x6) ^ S_5Z(0x2);
 310         s->mask[1] = S_5Z(0xA) ^ S_6Z(0xB) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_6Z(0x6);
 311         s->mask[2] = S_5Z(0xC) ^ S_6Z(0xD) ^ S_7Z(0x3) ^ S_8Z(0x2) ^ S_7Z(0x9);
 312         s->mask[3] = S_5Z(0xE) ^ S_6Z(0xF) ^ S_7Z(0x1) ^ S_8Z(0x0) ^ S_8Z(0xC);
 313         /***** B *****/
 314         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 315         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 316         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 317         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 318         /***** N *****/
 319         s->mask[4] = S_5X(0x3) ^ S_6X(0x2) ^ S_7X(0xC) ^ S_8X(0xD) ^ S_5X(0x8);
 320         s->mask[5] = S_5X(0x1) ^ S_6X(0x0) ^ S_7X(0xE) ^ S_8X(0xF) ^ S_6X(0xD);
 321         s->mask[6] = S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x8) ^ S_8X(0x9) ^ S_7X(0x3);
 322         s->mask[7] = S_5X(0x5) ^ S_6X(0x4) ^ S_7X(0xA) ^ S_8X(0xB) ^ S_8X(0x7);
 323         /***** A *****/
 324         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 325         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 326         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 327         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 328         /***** N' *****/
 329         s->mask[8] = S_5Z(0x3) ^ S_6Z(0x2) ^ S_7Z(0xC) ^ S_8Z(0xD) ^ S_5Z(0x9);
 330         s->mask[9] = S_5Z(0x1) ^ S_6Z(0x0) ^ S_7Z(0xE) ^ S_8Z(0xF) ^ S_6Z(0xC);
 331         s->mask[10] = S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x8) ^ S_8Z(0x9) ^ S_7Z(0x2);
 332         s->mask[11] = S_5Z(0x5) ^ S_6Z(0x4) ^ S_7Z(0xA) ^ S_8Z(0xB) ^ S_8Z(0x6);
 333         /***** B *****/
 334         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 335         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 336         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 337         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 338         /***** M' *****/
 339         s->mask[12] = S_5X(0x8) ^ S_6X(0x9) ^ S_7X(0x7) ^ S_8X(0x6) ^ S_5X(0x3);
 340         s->mask[13] = S_5X(0xA) ^ S_6X(0xB) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_6X(0x7);
 341         s->mask[14] = S_5X(0xC) ^ S_6X(0xD) ^ S_7X(0x3) ^ S_8X(0x2) ^ S_7X(0x8);
 342         s->mask[15] = S_5X(0xE) ^ S_6X(0xF) ^ S_7X(0x1) ^ S_8X(0x0) ^ S_8X(0xD);
 343
 344         /* that were the masking keys, now the rotation keys */
 345         /* set the keys to zero */
 346         memset(&(s->rotl[0]),0,8);
 347         s->roth[0]=s->roth[1]=0;
 348         /***** A *****/
 349         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 350         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 351         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 352         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 353         /***** M *****/
 354         t = S_5Z(0x8) ^ S_6Z(0x9) ^ S_7Z(0x7) ^ S_8Z(0x6) ^ S_5Z(0x2);
 355         t >>= 24;
 356         s->rotl[0] |= t & 0x0f;
 357         s->roth[0] |= (t >> 4) & (1<<0);
 358         t = S_5Z(0xA) ^ S_6Z(0xB) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_6Z(0x6);
 359         t >>= 24;
 360         s->rotl[0] |= (t<<4) & 0xf0;
 361         s->roth[0] |= (t >> 3) & (1<<1);
 362         t = S_5Z(0xC) ^ S_6Z(0xD) ^ S_7Z(0x3) ^ S_8Z(0x2) ^ S_7Z(0x9);
 363         t >>= 24;
 364         s->rotl[1] |= t & 0x0f;
 365         s->roth[0] |= (t >> 2) & (1<<2);
 366         t = S_5Z(0xE) ^ S_6Z(0xF) ^ S_7Z(0x1) ^ S_8Z(0x0) ^ S_8Z(0xC);
 367         t >>= 24;
 368         s->rotl[1] |= (t<<4) & 0xf0;
 369         s->roth[0] |= (t >> 1) & (1<<3);
 370         /***** B *****/
 371         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 372         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 373         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 374         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 375         /***** N *****/
 376         t = S_5X(0x3) ^ S_6X(0x2) ^ S_7X(0xC) ^ S_8X(0xD) ^ S_5X(0x8);
 377         t >>= 24;
 378         s->rotl[2] |= t & 0x0f;
 379         s->roth[0] |= t & (1<<4);
 380         t = S_5X(0x1) ^ S_6X(0x0) ^ S_7X(0xE) ^ S_8X(0xF) ^ S_6X(0xD);
 381         t >>= 24;
 382         s->rotl[2] |= (t<<4) & 0xf0;
 383         s->roth[0] |= (t<<1) & (1<<5);
 384         t = S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x8) ^ S_8X(0x9) ^ S_7X(0x3);
 385         t >>= 24;
 386         s->rotl[3] |= t & 0x0f;
 387         s->roth[0] |= (t<<2) & (1<<6);
 388         t = S_5X(0x5) ^ S_6X(0x4) ^ S_7X(0xA) ^ S_8X(0xB) ^ S_8X(0x7);
 389         t >>= 24;
 390         s->rotl[3] |= (t<<4) & 0xf0;
 391         s->roth[0] |= (t<<3) & (1<<7);
 392         /***** A *****/
 393         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 394         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 395         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 396         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 397         /***** N' *****/
 398         t = S_5Z(0x3) ^ S_6Z(0x2) ^ S_7Z(0xC) ^ S_8Z(0xD) ^ S_5Z(0x9);
 399         t >>= 24;
 400         s->rotl[4] |= t & 0x0f;
 401         s->roth[1] |= (t>>4) & (1<<0);
 402         t = S_5Z(0x1) ^ S_6Z(0x0) ^ S_7Z(0xE) ^ S_8Z(0xF) ^ S_6Z(0xC);
 403         t >>= 24;
 404         s->rotl[4] |= (t<<4) & 0xf0;
 405         s->roth[1] |= (t>>3) & (1<<1);
 406         t = S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x8) ^ S_8Z(0x9) ^ S_7Z(0x2);
 407         t >>= 24;
 408         s->rotl[5] |= t & 0x0f;
 409         s->roth[1] |= (t>>2) & (1<<2);
 410         t = S_5Z(0x5) ^ S_6Z(0x4) ^ S_7Z(0xA) ^ S_8Z(0xB) ^ S_8Z(0x6);
 411         t >>= 24;
 412         s->rotl[5] |= (t<<4) & 0xf0;
 413         s->roth[1] |= (t>>1) & (1<<3);
 414         /***** B *****/
 415         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 416         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 417         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 418         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 419         /***** M' *****/
 420         t = S_5X(0x8) ^ S_6X(0x9) ^ S_7X(0x7) ^ S_8X(0x6) ^ S_5X(0x3);
 421         t >>= 24;
 422         s->rotl[6] |= t & 0x0f;
 423         s->roth[1] |= t & (1<<4);
 424         t = S_5X(0xA) ^ S_6X(0xB) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_6X(0x7);
 425         t >>= 24;
 426         s->rotl[6] |= (t<<4) & 0xf0;
 427         s->roth[1] |= (t<<1) & (1<<5);
 428         t = S_5X(0xC) ^ S_6X(0xD) ^ S_7X(0x3) ^ S_8X(0x2) ^ S_7X(0x8);
 429         t >>= 24;
 430         s->rotl[7] |= t & 0x0f;
 431         s->roth[1] |= (t<<2) & (1<<6);
 432         t = S_5X(0xE) ^ S_6X(0xF) ^ S_7X(0x1) ^ S_8X(0x0) ^ S_8X(0xD);
 433         t >>= 24;
 434         s->rotl[7] |= (t<<4) & 0xf0;
 435         s->roth[1] |= (t<<3) & (1<<7);
 436
 437         /* done ;-) */
 438 }
 439
 440 #endif
 441
 442
 443
 444