tommath/bn_mp_cmp_mag.c

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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
* LibTomMath is library that provides for multiple-precision
* integer arithmetic as well as number theoretic functionality.
*
* The library is designed directly after the MPI library by
* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
* The library is free for all purposes without any express
* guarantee it works.
*
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* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
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*/
#include <tommath.h>
/* compare maginitude of two ints (unsigned) */
int
mp_cmp_mag (mp_int * a, mp_int * b)
{
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int n;
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/* compare based on # of non-zero digits */
if (a->used > b->used) {
return MP_GT;
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}
if (a->used < b->used) {
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return MP_LT;
}
/* compare based on digits */
for (n = a->used - 1; n >= 0; n--) {
if (a->dp[n] > b->dp[n]) {
return MP_GT;
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}
if (a->dp[n] < b->dp[n]) {
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return MP_LT;
}
}
return MP_EQ;
}