Mercurial > dropbear

comparison bn_mp_sqr.c @ 2:86e0b50a9b58 libtommath-orig ltm-0.30-orig

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
ltm 0.30 orig import
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:22 +0000
parents
children d29b64170cf0
comparison
equal deleted inserted replaced
-1:000000000000 2:86e0b50a9b58
1 /* LibTomMath, multiple-precision integer library -- Tom St Denis
2 *
3 * LibTomMath is a library that provides multiple-precision
4 * integer arithmetic as well as number theoretic functionality.
5 *
6 * The library was designed directly after the MPI library by
7 * Michael Fromberger but has been written from scratch with
8 * additional optimizations in place.
9 *
10 * The library is free for all purposes without any express
11 * guarantee it works.
12 *
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org
14 */
15 #include <tommath.h>
16
17 /* computes b = a*a */
18 int
19 mp_sqr (mp_int * a, mp_int * b)
20 {
21 int res;
22
23 /* use Toom-Cook? */
24 if (a->used >= TOOM_SQR_CUTOFF) {
25 res = mp_toom_sqr(a, b);
26 /* Karatsuba? */
27 } else if (a->used >= KARATSUBA_SQR_CUTOFF) {
28 res = mp_karatsuba_sqr (a, b);
29 } else {
30 /* can we use the fast comba multiplier? */
31 if ((a->used * 2 + 1) < MP_WARRAY &&
32 a->used <
33 (1 << (sizeof(mp_word) * CHAR_BIT - 2*DIGIT_BIT - 1))) {
34 res = fast_s_mp_sqr (a, b);
35 } else {
36 res = s_mp_sqr (a, b);
37 }
38 }
39 b->sign = MP_ZPOS;
40 return res;
41 }