tommath/bn_mp_cmp_mag.c

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#include "tommath_private.h"
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#ifdef BN_MP_CMP_MAG_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
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* SPDX-License-Identifier: Unlicense
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*/
/* compare maginitude of two ints (unsigned) */
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int mp_cmp_mag(const mp_int *a, const mp_int *b)
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{
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int n;
mp_digit *tmpa, *tmpb;
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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) {
return MP_LT;
}
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/* alias for a */
tmpa = a->dp + (a->used - 1);
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/* alias for b */
tmpb = b->dp + (a->used - 1);
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/* compare based on digits */
for (n = 0; n < a->used; ++n, --tmpa, --tmpb) {
if (*tmpa > *tmpb) {
return MP_GT;
}
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if (*tmpa < *tmpb) {
return MP_LT;
}
}
return MP_EQ;
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}
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#endif
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/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */