dropbear: bn_mp_cmp.c comparison

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

comparison

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+:91fbc376f010
+#include <tommath.h>
+#ifdef BN_MP_CMP_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 two ints (signed)*/
+int
+mp_cmp (mp_int * a, mp_int * b)
+{
+/* compare based on sign */
+if (a->sign != b->sign) {
+if (a->sign == MP_NEG) {
+return MP_LT;
+} else {
+return MP_GT;
+}
+}
+/* compare digits */
+if (a->sign == MP_NEG) {
+/* if negative compare opposite direction */
+return mp_cmp_mag(b, a);
+} else {
+return mp_cmp_mag(a, b);
+}
+}
+#endif

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