dropbear: bn_mp_cmp_mag.c comparison

Import of libtommath 0.35 From ltm-0.35.tar.bz2 SHA1 of 3f193dbae9351e92d02530994fa18236f7fde01c

comparison

equal deleted inserted replaced

--1:000000000000
+:91fbc376f010
+#include <tommath.h>
+#ifdef BN_MP_CMP_MAG_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+*
+* LibTomMath is a library that provides multiple-precision
+* integer arithmetic as well as number theoretic functionality.
+*
+* The library was 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.
+*
+* Tom St Denis, [email protected], http://math.libtomcrypt.org
+*/
+/* compare maginitude of two ints (unsigned) */
+int mp_cmp_mag (mp_int * a, mp_int * b)
+{
+int     n;
+mp_digit *tmpa, *tmpb;
+/* compare based on # of non-zero digits */
+if (a->used > b->used) {
+return MP_GT;
+}
+if (a->used < b->used) {
+return MP_LT;
+}
+/* alias for a */
+tmpa = a->dp + (a->used - 1);
+/* alias for b */
+tmpb = b->dp + (a->used - 1);
+/* compare based on digits  */
+for (n = 0; n < a->used; ++n, --tmpa, --tmpb) {
+if (*tmpa > *tmpb) {
+return MP_GT;
+}
+if (*tmpa < *tmpb) {
+return MP_LT;
+}
+}
+return MP_EQ;
+}
+#endif

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