tomcrypt-sys 0.1.0

Raw bindings to libtomcrypt
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include "tomcrypt.h"

/**
  Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
*/

#ifdef LTC_XTS_MODE

/** multiply by x
  @param I      The value to multiply by x (LFSR shift)
*/
void xts_mult_x(unsigned char *I)
{
   int x;
   unsigned char t, tt;

   for (x = t = 0; x < 16; x++) {
      tt = I[x] >> 7;
      I[x] = ((I[x] << 1) | t) & 0xFF;
      t = tt;
   }
   if (tt) {
      I[0] ^= 0x87;
   }
}

#endif

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */