1 #include <tommath.h> 2 #ifdef BN_MP_CMP_MAG_C 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 4 * 5 * LibTomMath is a library that provides multiple-precision 6 * integer arithmetic as well as number theoretic functionality. 7 * 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. 11 * 12 * The library is free for all purposes without any express 13 * guarantee it works. 14 * 15 * Tom St Denis, tomstdenis (at) gmail.com, http://math.libtomcrypt.com 16 */ 17 18 /* compare maginitude of two ints (unsigned) */ 19 int mp_cmp_mag (mp_int * a, mp_int * b) 20 { 21 int n; 22 mp_digit *tmpa, *tmpb; 23 24 /* compare based on # of non-zero digits */ 25 if (a->used > b->used) { 26 return MP_GT; 27 } 28 29 if (a->used < b->used) { 30 return MP_LT; 31 } 32 33 /* alias for a */ 34 tmpa = a->dp + (a->used - 1); 35 36 /* alias for b */ 37 tmpb = b->dp + (a->used - 1); 38 39 /* compare based on digits */ 40 for (n = 0; n < a->used; ++n, --tmpa, --tmpb) { 41 if (*tmpa > *tmpb) { 42 return MP_GT; 43 } 44 45 if (*tmpa < *tmpb) { 46 return MP_LT; 47 } 48 } 49 return MP_EQ; 50 } 51 #endif 52 53 /* $Source: /cvs/libtom/libtommath/bn_mp_cmp_mag.c,v $ */ 54 /* $Revision: 1.3 $ */ 55 /* $Date: 2006/03/31 14:18:44 $ */ 56
