3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
20 * Simple algorithm which zeroes the int, grows it then just sets one bit
24 mp_2expt (mp_int * a, int b)
28 /* zero a as per default */
31 /* grow a to accomodate the single bit */
32 if ((res = mp_grow (a, b / DIGIT_BIT + 1)) != MP_OKAY) {
36 /* set the used count of where the bit will go */
37 a->used = b / DIGIT_BIT + 1;
39 /* put the single bit in its place */
40 a->dp[b / DIGIT_BIT] = ((mp_digit)1) << (b % DIGIT_BIT);
46 /* $Source: /cvs/libtom/libtommath/bn_mp_2expt.c,v $ */
47 /* $Revision: 1.3 $ */
48 /* $Date: 2006/03/31 14:18:44 $ */