cast5.c

   1 /*
   2  * \file        cast5.c
   3  * \author      Daniel Otte
   4  * \date        26.07.2006
   5  * \par License:
   6  *  GPL
   7  * \brief Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
   8  *
   9  */
  10
  11  #include <stdint.h>
  12  #include <string.h>
  13  #include "cast5.h"
  14  #include "config.h"
  15  #include "debug.h"
  16
  17  #undef DEBUG
  18
  19  #ifdef DEBUG
  20   #include "uart.h"
  21  #endif
  22
  23 #include "cast5-sbox.h"
  24
  25
  26
  27 #define S5(x) pgm_read_dword(&s5[(x)])
  28 #define S6(x) pgm_read_dword(&s6[(x)])
  29 #define S7(x) pgm_read_dword(&s7[(x)])
  30 #define S8(x) pgm_read_dword(&s8[(x)])
  31
  32
  33 void cast5_init_A(uint8_t *dest, uint8_t *src, bool bmode){
  34         uint8_t mask = bmode?0x8:0;
  35         *((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]);
  36         *((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]);
  37         *((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]);
  38         *((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]);
  39 }
  40
  41 void cast5_init_M(uint8_t *dest, uint8_t *src, bool nmode, bool xmode){
  42         uint8_t nmt[] = {0xB, 0xA, 0x9, 0x8, 0xF, 0xE, 0xD, 0xC, 0x3, 0x2, 0x1, 0x0, 0x7, 0x6, 0x5, 0x4}; /* nmode table */
  43         uint8_t xmt[4][4] = {{0x2, 0x6, 0x9, 0xC}, {0x8, 0xD, 0x3, 0x7}, {0x3, 0x7, 0x8, 0xD}, {0x9, 0xC, 0x2, 0x6}};
  44         #define NMT(x) (src[nmode?nmt[(x)]:(x)])
  45         #define XMT(x) (src[xmt[(xmode<<1) + nmode][(x)]])
  46         *((uint32_t*)(&dest[0x0])) = S5(NMT(0x8)) ^ S6(NMT(0x9)) ^ S7(NMT(0x7)) ^ S8(NMT(0x6)) ^ S5(XMT(0));
  47         *((uint32_t*)(&dest[0x4])) = S5(NMT(0xA)) ^ S6(NMT(0xB)) ^ S7(NMT(0x5)) ^ S8(NMT(0x4)) ^ S6(XMT(1));
  48         *((uint32_t*)(&dest[0x8])) = S5(NMT(0xC)) ^ S6(NMT(0xD)) ^ S7(NMT(0x3)) ^ S8(NMT(0x2)) ^ S7(XMT(2));
  49         *((uint32_t*)(&dest[0xC])) = S5(NMT(0xE)) ^ S6(NMT(0xF)) ^ S7(NMT(0x1)) ^ S8(NMT(0x0)) ^ S8(XMT(3));
  50 }
  51
  52 #define S5B(x) pgm_read_byte(3+(uint8_t*)(&s5[(x)]))
  53 #define S6B(x) pgm_read_byte(3+(uint8_t*)(&s6[(x)]))
  54 #define S7B(x) pgm_read_byte(3+(uint8_t*)(&s7[(x)]))
  55 #define S8B(x) pgm_read_byte(3+(uint8_t*)(&s8[(x)]))
  56
  57 void cast5_init_rM(uint8_t *klo, uint8_t *khi, uint8_t offset, uint8_t *src, bool nmode, bool xmode){
  58         uint8_t nmt[] = {0xB, 0xA, 0x9, 0x8, 0xF, 0xE, 0xD, 0xC, 0x3, 0x2, 0x1, 0x0, 0x7, 0x6, 0x5, 0x4}; /* nmode table */
  59         uint8_t xmt[4][4] = {{0x2, 0x6, 0x9, 0xC}, {0x8, 0xD, 0x3, 0x7}, {0x3, 0x7, 0x8, 0xD}, {0x9, 0xC, 0x2, 0x6}};
  60         uint8_t t, h=0;
  61         t = S5B(NMT(0x8)) ^ S6B(NMT(0x9)) ^ S7B(NMT(0x7)) ^ S8B(NMT(0x6)) ^ S5B(XMT(0));
  62                 klo[offset*2] |= (t & 0x0f);
  63                 h |= (t&0x10); h>>=1;
  64         t = S5B(NMT(0xA)) ^ S6B(NMT(0xB)) ^ S7B(NMT(0x5)) ^ S8B(NMT(0x4)) ^ S6B(XMT(1));
  65                 klo[offset*2] |= (t<<4) & 0xf0;
  66                 h |= t&0x10; h>>=1;
  67         t = S5B(NMT(0xC)) ^ S6B(NMT(0xD)) ^ S7B(NMT(0x3)) ^ S8B(NMT(0x2)) ^ S7B(XMT(2));
  68                 klo[offset*2+1] |= t&0xf;
  69                 h |= t&0x10; h>>=1;
  70         t = S5B(NMT(0xE)) ^ S6B(NMT(0xF)) ^ S7B(NMT(0x1)) ^ S8B(NMT(0x0)) ^ S8B(XMT(3));
  71                 klo[offset*2+1] |= t<<4;
  72                 h |= t&0x10; h >>=1;
  73         #ifdef DEBUG
  74                 uart_putstr("\r\n\t h="); uart_hexdump(&h,1);
  75         #endif
  76         khi[offset>>1] |= h<<((offset&0x1)?4:0);
  77 }
  78
  79 #define S_5X(s) pgm_read_dword(&s5[BPX[(s)]])
  80 #define S_6X(s) pgm_read_dword(&s6[BPX[(s)]])
  81 #define S_7X(s) pgm_read_dword(&s7[BPX[(s)]])
  82 #define S_8X(s) pgm_read_dword(&s8[BPX[(s)]])
  83
  84 #define S_5Z(s) pgm_read_dword(&s5[BPZ[(s)]])
  85 #define S_6Z(s) pgm_read_dword(&s6[BPZ[(s)]])
  86 #define S_7Z(s) pgm_read_dword(&s7[BPZ[(s)]])
  87 #define S_8Z(s) pgm_read_dword(&s8[BPZ[(s)]])
  88
  89
  90
  91 /**
  92  * \brief sets up round keys (context) for cast5 en/decryption.
  93  * @param s Pointer to cast5 context.
  94  * @param key Pointer to binary key.
  95  * @param keylength length of keydata in bits.
  96  */
  97 void cast5_init(cast5_ctx_t* s, uint8_t* key, uint8_t keylength){
  98          /* we migth return if the key is valid and if setup was sucessfull */
  99         uint32_t x[4], z[4];
 100         #define BPX ((uint8_t*)&(x[0]))
 101         #define BPZ ((uint8_t*)&(z[0]))
 102         s->shortkey = (keylength<=80);
 103         /* littel endian only! */
 104         memset(&(x[0]), 0 ,16); /* set x to zero */
 105         memcpy(&(x[0]), key, keylength/8);
 106
 107
 108         /* todo: merge a and b and compress the whole stuff */
 109         /***** A *****/
 110         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 111         /***** M *****/
 112         cast5_init_M((uint8_t*)(&(s->mask[0])), (uint8_t*)(&z[0]), false, false);
 113         /***** B *****/
 114         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 115         /***** N *****/
 116         cast5_init_M((uint8_t*)(&(s->mask[4])), (uint8_t*)(&x[0]), true, false);
 117         /***** A *****/
 118         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 119         /***** N' *****/
 120         cast5_init_M((uint8_t*)(&(s->mask[8])), (uint8_t*)(&z[0]), true, true);
 121         /***** B *****/
 122         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 123         /***** M' *****/
 124         cast5_init_M((uint8_t*)(&(s->mask[12])), (uint8_t*)(&x[0]), false, true);
 125
 126         /* that were the masking keys, now the rotation keys */
 127         /* set the keys to zero */
 128         memset(&(s->rotl[0]),0,8);
 129         s->roth[0]=s->roth[1]=0;
 130         /***** A *****/
 131         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 132         /***** M *****/
 133         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 0, (uint8_t*)(&z[0]), false, false);
 134         /***** B *****/
 135         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 136         /***** N *****/
 137         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 1, (uint8_t*)(&x[0]), true, false);
 138         /***** A *****/
 139         cast5_init_A((uint8_t*)(&z[0]), (uint8_t*)(&x[0]), false);
 140         /***** N' *****/
 141         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 2, (uint8_t*)(&z[0]), true, true);
 142         /***** B *****/
 143         cast5_init_A((uint8_t*)(&x[0]), (uint8_t*)(&z[0]), true);
 144         /***** M' *****/
 145         cast5_init_rM(&(s->rotl[0]), &(s->roth[0]), 3, (uint8_t*)(&x[0]), false, true);
 146         /* done ;-) */
 147 }
 148
 149
 150
 151 /********************************************************************************************************/
 152
 153 #define ROTL32(a,n) ((a)<<(n) | (a)>>(32-(n)))
 154 #define CHANGE_ENDIAN32(x) ((x)<<24 | (x)>>24 | ((x)&0xff00)<<8 | ((x)&0xff0000)>>8 )
 155
 156 typedef uint32_t cast5_f_t(uint32_t,uint32_t,uint8_t);
 157
 158 #define IA 3
 159 #define IB 2
 160 #define IC 1
 161 #define ID 0
 162
 163
 164 uint32_t cast5_f1(uint32_t d, uint32_t m, uint8_t r){
 165         uint32_t t;
 166         t = ROTL32((d + m),r);
 167 #ifdef DEBUG
 168         uint32_t ia,ib,ic,id;
 169         uart_putstr("\r\n f1("); uart_hexdump(&d, 4); uart_putc(',');
 170                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 171                 uart_hexdump(&t, 4);
 172         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 173         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 174         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 175         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 176         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 177         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 178         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 179         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 180
 181         return (((ia ^ ib) - ic) + id);
 182
 183 #else
 184
 185         return (((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) ^ pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 186                 - pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) + pgm_read_dword(&s4[((uint8_t*)&t)[ID]]));
 187
 188 #endif
 189 }
 190
 191
 192 uint32_t cast5_f2(uint32_t d, uint32_t m, uint8_t r){
 193         uint32_t t;
 194         t = ROTL32((d ^ m),r);
 195 #ifdef DEBUG
 196         uint32_t ia,ib,ic,id;
 197         uart_putstr("\r\n f2("); uart_hexdump(&d, 4); uart_putc(',');
 198                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 199                 uart_hexdump(&t, 4);
 200
 201         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 202         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 203         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 204         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 205
 206         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 207         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 208         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 209         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 210
 211         return (((ia - ib) + ic) ^ id);
 212 #else
 213
 214         return (((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) - pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 215                 + pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) ^ pgm_read_dword(&s4[((uint8_t*)&t)[ID]]));
 216
 217 #endif
 218 }
 219
 220 uint32_t cast5_f3(uint32_t d, uint32_t m, uint8_t r){
 221         uint32_t t;
 222         t = ROTL32((m - d),r);
 223
 224 #ifdef DEBUG
 225         uint32_t ia,ib,ic,id;
 226
 227         uart_putstr("\r\n f3("); uart_hexdump(&d, 4); uart_putc(',');
 228                 uart_hexdump(&m , 4); uart_putc(','); uart_hexdump(&r, 1);uart_putstr("): I=");
 229                 uart_hexdump(&t, 4);
 230
 231         ia = pgm_read_dword(&s1[((uint8_t*)&t)[IA]] );
 232         ib = pgm_read_dword(&s2[((uint8_t*)&t)[IB]] );
 233         ic = pgm_read_dword(&s3[((uint8_t*)&t)[IC]] );
 234         id = pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 235
 236         uart_putstr("\r\n\tIA="); uart_hexdump(&ia, 4);
 237         uart_putstr("\r\n\tIB="); uart_hexdump(&ib, 4);
 238         uart_putstr("\r\n\tIC="); uart_hexdump(&ic, 4);
 239         uart_putstr("\r\n\tID="); uart_hexdump(&id, 4);
 240         return (((ia + ib) ^ ic) - id);
 241 #else
 242         return ((pgm_read_dword(&s1[((uint8_t*)&t)[IA]] ) + pgm_read_dword(&s2[((uint8_t*)&t)[IB]] ))
 243                 ^ pgm_read_dword(&s3[((uint8_t*)&t)[IC]] )) - pgm_read_dword(&s4[((uint8_t*)&t)[ID]] );
 244
 245 #endif
 246 }
 247
 248 /*************************************************************************/
 249
 250 /**
 251  * \brief encrypts a datablock with cast5
 252  * @param s Pointer to cast5 roundkeys (context)
 253  * @param block Pointer to datablock
 254  */
 255 void cast5_enc(cast5_ctx_t *s, void* block){
 256         uint32_t l,r, x, y;
 257         uint8_t i;
 258         cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};
 259         l=((uint32_t*)block)[0];
 260         r=((uint32_t*)block)[1];
 261 //      uart_putstr("\r\n round[-1] = ");
 262 //      uart_hexdump(&r, 4);
 263         for (i=0;i<(s->shortkey?12:16);++i){
 264                 x = r;
 265                 y = (f[i%3])(CHANGE_ENDIAN32(r), CHANGE_ENDIAN32(s->mask[i]),
 266                         (((s->roth[i>>3]) & (1<<(i&0x7)))?0x10:0x00)
 267                          + ( ((s->rotl[i>>1])>>((i&1)?4:0)) & 0x0f) );
 268                 r = l ^ CHANGE_ENDIAN32(y);
 269 //              uart_putstr("\r\n round["); DEBUG_B(i); uart_putstr("] = ");
 270 //              uart_hexdump(&r, 4);
 271                 l = x;
 272         }
 273         ((uint32_t*)block)[0]=r;
 274         ((uint32_t*)block)[1]=l;
 275 }
 276
 277 /*************************************************************************/
 278
 279 /**
 280  * \brief decrypts a datablock with cast5
 281  * @param s Pointer to cast5 roundkeys (context)
 282  * @param block Pointer to datablock
 283  */
 284 void cast5_dec(cast5_ctx_t *s, void* block){
 285         uint32_t l,r, x, y;
 286         int8_t i, rounds;
 287         cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};
 288         l=((uint32_t*)block)[0];
 289         r=((uint32_t*)block)[1];
 290         rounds = (s->shortkey?12:16);
 291         for (i=rounds-1; i>=0 ;--i){
 292                 x = r;
 293                 y = (f[i%3])(CHANGE_ENDIAN32(r), CHANGE_ENDIAN32(s->mask[i]),
 294                         (((s->roth[i>>3]) & (1<<(i&0x7)))?0x10:0x00)
 295                          + ( ((s->rotl[i>>1])>>((i&1)?4:0)) & 0x0f) );
 296                 r = l ^ CHANGE_ENDIAN32(y);
 297                 l = x;
 298         }
 299         ((uint32_t*)block)[0]=r;
 300         ((uint32_t*)block)[1]=l;
 301 }
 302
 303
 304 /*********************************************************************************************************/
 305 /*********************************************************************************************************/
 306 /*********************************************************************************************************/
 307
 308 #if 0
 309
 310 void cast5_old_init(cast5_ctx_t* s, uint8_t* key, uint8_t keylength){
 311          /* we migth return if the key is valid and if setup was sucessfull */
 312         uint32_t x[4], z[4], t;
 313         #define BPX ((uint8_t*)&(x[0]))
 314         #define BPZ ((uint8_t*)&(z[0]))
 315         s->shortkey = (keylength<=80);
 316         /* littel endian only! */
 317         memset(&(x[0]), 0 ,16); /* set x to zero */
 318         memcpy(&(x[0]), key, keylength/8);
 319
 320
 321         /* todo: merge a and b and compress the whole stuff */
 322         /***** A *****/
 323         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 324         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 325         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 326         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 327         /***** M *****/
 328         s->mask[0] = S_5Z(0x8) ^ S_6Z(0x9) ^ S_7Z(0x7) ^ S_8Z(0x6) ^ S_5Z(0x2);
 329         s->mask[1] = S_5Z(0xA) ^ S_6Z(0xB) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_6Z(0x6);
 330         s->mask[2] = S_5Z(0xC) ^ S_6Z(0xD) ^ S_7Z(0x3) ^ S_8Z(0x2) ^ S_7Z(0x9);
 331         s->mask[3] = S_5Z(0xE) ^ S_6Z(0xF) ^ S_7Z(0x1) ^ S_8Z(0x0) ^ S_8Z(0xC);
 332         /***** B *****/
 333         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 334         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 335         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 336         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 337         /***** N *****/
 338         s->mask[4] = S_5X(0x3) ^ S_6X(0x2) ^ S_7X(0xC) ^ S_8X(0xD) ^ S_5X(0x8);
 339         s->mask[5] = S_5X(0x1) ^ S_6X(0x0) ^ S_7X(0xE) ^ S_8X(0xF) ^ S_6X(0xD);
 340         s->mask[6] = S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x8) ^ S_8X(0x9) ^ S_7X(0x3);
 341         s->mask[7] = S_5X(0x5) ^ S_6X(0x4) ^ S_7X(0xA) ^ S_8X(0xB) ^ S_8X(0x7);
 342         /***** A *****/
 343         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 344         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 345         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 346         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 347         /***** N' *****/
 348         s->mask[8] = S_5Z(0x3) ^ S_6Z(0x2) ^ S_7Z(0xC) ^ S_8Z(0xD) ^ S_5Z(0x9);
 349         s->mask[9] = S_5Z(0x1) ^ S_6Z(0x0) ^ S_7Z(0xE) ^ S_8Z(0xF) ^ S_6Z(0xC);
 350         s->mask[10] = S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x8) ^ S_8Z(0x9) ^ S_7Z(0x2);
 351         s->mask[11] = S_5Z(0x5) ^ S_6Z(0x4) ^ S_7Z(0xA) ^ S_8Z(0xB) ^ S_8Z(0x6);
 352         /***** B *****/
 353         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 354         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 355         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 356         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 357         /***** M' *****/
 358         s->mask[12] = S_5X(0x8) ^ S_6X(0x9) ^ S_7X(0x7) ^ S_8X(0x6) ^ S_5X(0x3);
 359         s->mask[13] = S_5X(0xA) ^ S_6X(0xB) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_6X(0x7);
 360         s->mask[14] = S_5X(0xC) ^ S_6X(0xD) ^ S_7X(0x3) ^ S_8X(0x2) ^ S_7X(0x8);
 361         s->mask[15] = S_5X(0xE) ^ S_6X(0xF) ^ S_7X(0x1) ^ S_8X(0x0) ^ S_8X(0xD);
 362
 363         /* that were the masking keys, now the rotation keys */
 364         /* set the keys to zero */
 365         memset(&(s->rotl[0]),0,8);
 366         s->roth[0]=s->roth[1]=0;
 367         /***** A *****/
 368         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 369         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 370         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 371         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 372         /***** M *****/
 373         t = S_5Z(0x8) ^ S_6Z(0x9) ^ S_7Z(0x7) ^ S_8Z(0x6) ^ S_5Z(0x2);
 374         t >>= 24;
 375         s->rotl[0] |= t & 0x0f;
 376         s->roth[0] |= (t >> 4) & (1<<0);
 377         t = S_5Z(0xA) ^ S_6Z(0xB) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_6Z(0x6);
 378         t >>= 24;
 379         s->rotl[0] |= (t<<4) & 0xf0;
 380         s->roth[0] |= (t >> 3) & (1<<1);
 381         t = S_5Z(0xC) ^ S_6Z(0xD) ^ S_7Z(0x3) ^ S_8Z(0x2) ^ S_7Z(0x9);
 382         t >>= 24;
 383         s->rotl[1] |= t & 0x0f;
 384         s->roth[0] |= (t >> 2) & (1<<2);
 385         t = S_5Z(0xE) ^ S_6Z(0xF) ^ S_7Z(0x1) ^ S_8Z(0x0) ^ S_8Z(0xC);
 386         t >>= 24;
 387         s->rotl[1] |= (t<<4) & 0xf0;
 388         s->roth[0] |= (t >> 1) & (1<<3);
 389         /***** B *****/
 390         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 391         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 392         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 393         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 394         /***** N *****/
 395         t = S_5X(0x3) ^ S_6X(0x2) ^ S_7X(0xC) ^ S_8X(0xD) ^ S_5X(0x8);
 396         t >>= 24;
 397         s->rotl[2] |= t & 0x0f;
 398         s->roth[0] |= t & (1<<4);
 399         t = S_5X(0x1) ^ S_6X(0x0) ^ S_7X(0xE) ^ S_8X(0xF) ^ S_6X(0xD);
 400         t >>= 24;
 401         s->rotl[2] |= (t<<4) & 0xf0;
 402         s->roth[0] |= (t<<1) & (1<<5);
 403         t = S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x8) ^ S_8X(0x9) ^ S_7X(0x3);
 404         t >>= 24;
 405         s->rotl[3] |= t & 0x0f;
 406         s->roth[0] |= (t<<2) & (1<<6);
 407         t = S_5X(0x5) ^ S_6X(0x4) ^ S_7X(0xA) ^ S_8X(0xB) ^ S_8X(0x7);
 408         t >>= 24;
 409         s->rotl[3] |= (t<<4) & 0xf0;
 410         s->roth[0] |= (t<<3) & (1<<7);
 411         /***** A *****/
 412         z[0] = x[0] ^ S_5X(0xD) ^ S_6X(0xF) ^ S_7X(0xC) ^ S_8X(0xE) ^ S_7X(0x8);
 413         z[1] = x[2] ^ S_5Z(0x0) ^ S_6Z(0x2) ^ S_7Z(0x1) ^ S_8Z(0x3) ^ S_8X(0xA);
 414         z[2] = x[3] ^ S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x5) ^ S_8Z(0x4) ^ S_5X(0x9);
 415         z[3] = x[1] ^ S_5Z(0xA) ^ S_6Z(0x9) ^ S_7Z(0xB) ^ S_8Z(0x8) ^ S_6X(0xB);
 416         /***** N' *****/
 417         t = S_5Z(0x3) ^ S_6Z(0x2) ^ S_7Z(0xC) ^ S_8Z(0xD) ^ S_5Z(0x9);
 418         t >>= 24;
 419         s->rotl[4] |= t & 0x0f;
 420         s->roth[1] |= (t>>4) & (1<<0);
 421         t = S_5Z(0x1) ^ S_6Z(0x0) ^ S_7Z(0xE) ^ S_8Z(0xF) ^ S_6Z(0xC);
 422         t >>= 24;
 423         s->rotl[4] |= (t<<4) & 0xf0;
 424         s->roth[1] |= (t>>3) & (1<<1);
 425         t = S_5Z(0x7) ^ S_6Z(0x6) ^ S_7Z(0x8) ^ S_8Z(0x9) ^ S_7Z(0x2);
 426         t >>= 24;
 427         s->rotl[5] |= t & 0x0f;
 428         s->roth[1] |= (t>>2) & (1<<2);
 429         t = S_5Z(0x5) ^ S_6Z(0x4) ^ S_7Z(0xA) ^ S_8Z(0xB) ^ S_8Z(0x6);
 430         t >>= 24;
 431         s->rotl[5] |= (t<<4) & 0xf0;
 432         s->roth[1] |= (t>>1) & (1<<3);
 433         /***** B *****/
 434         x[0] = z[2] ^ S_5Z(0x5) ^ S_6Z(0x7) ^ S_7Z(0x4) ^ S_8Z(0x6) ^ S_7Z(0x0);
 435         x[1] = z[0] ^ S_5X(0x0) ^ S_6X(0x2) ^ S_7X(0x1) ^ S_8X(0x3) ^ S_8Z(0x2);
 436         x[2] = z[1] ^ S_5X(0x7) ^ S_6X(0x6) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_5Z(0x1);
 437         x[3] = z[3] ^ S_5X(0xA) ^ S_6X(0x9) ^ S_7X(0xB) ^ S_8X(0x8) ^ S_6Z(0x3);
 438         /***** M' *****/
 439         t = S_5X(0x8) ^ S_6X(0x9) ^ S_7X(0x7) ^ S_8X(0x6) ^ S_5X(0x3);
 440         t >>= 24;
 441         s->rotl[6] |= t & 0x0f;
 442         s->roth[1] |= t & (1<<4);
 443         t = S_5X(0xA) ^ S_6X(0xB) ^ S_7X(0x5) ^ S_8X(0x4) ^ S_6X(0x7);
 444         t >>= 24;
 445         s->rotl[6] |= (t<<4) & 0xf0;
 446         s->roth[1] |= (t<<1) & (1<<5);
 447         t = S_5X(0xC) ^ S_6X(0xD) ^ S_7X(0x3) ^ S_8X(0x2) ^ S_7X(0x8);
 448         t >>= 24;
 449         s->rotl[7] |= t & 0x0f;
 450         s->roth[1] |= (t<<2) & (1<<6);
 451         t = S_5X(0xE) ^ S_6X(0xF) ^ S_7X(0x1) ^ S_8X(0x0) ^ S_8X(0xD);
 452         t >>= 24;
 453         s->rotl[7] |= (t<<4) & 0xf0;
 454         s->roth[1] |= (t<<3) & (1<<7);
 455
 456         /* done ;-) */
 457 }
 458
 459 #endif
 460
 461
 462
 463