/* -*-c-*-
*
- * $Id: xtea.c,v 1.1 2000/07/15 13:44:31 mdw Exp $
+ * $Id: xtea.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
*
* The Extended Tiny Encryption Algorithm
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: xtea.c,v $
- * Revision 1.1 2000/07/15 13:44:31 mdw
- * New ciphers.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include <mLib/bits.h>
p = kb;
}
- k->k[0] = LOAD32(p + 0); k->k[1] = LOAD32(p + 4);
- k->k[2] = LOAD32(p + 8); k->k[3] = LOAD32(p + 12);
+ k->k[0] = LOAD32(p + 0); k->k[1] = LOAD32(p + 4);
+ k->k[2] = LOAD32(p + 8); k->k[3] = LOAD32(p + 12);
+ k->r = 32;
if (p == kb)
BURN(kb);
uint32 n = 0;
unsigned i;
- for (i = 0; i < 32; i++) {
+ for (i = 0; i < k->r; i++) {
y = U32(y + ((((z << 4) ^ (z >> 5)) + z) ^ (n + k->k[n & 3])));
n += DELTA;
z = U32(z + ((((y << 4) ^ (y >> 5)) + y) ^ (n + k->k[(n >> 11) & 3])));
void xtea_dblk(const xtea_ctx *k, const uint32 *s, uint32 *d)
{
uint32 y = s[0], z = s[1];
- uint32 n = DELTA << 5;
+ uint32 n = DELTA * k->r;
unsigned i;
- for (i = 0; i < 32; i++) {
+ for (i = 0; i < k->r; i++) {
z = U32(z - ((((y << 4) ^ (y >> 5)) + y) ^ (n + k->k[(n >> 11) & 3])));
n -= DELTA;
y = U32(y - ((((z << 4) ^ (z >> 5)) + z) ^ (n + k->k[n & 3])));