dropbear: bn_mp_cmp_d.c comparison

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+:22d5cf7d4b1a
+/* 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
+*/
+#include <tommath.h>
+/* compare a digit */
+int mp_cmp_d(mp_int * a, mp_digit b)
+{
+/* compare based on sign */
+if (a->sign == MP_NEG) {
+return MP_LT;
+}
+/* compare based on magnitude */
+if (a->used > 1) {
+return MP_GT;
+}
+/* compare the only digit of a to b */
+if (a->dp[0] > b) {
+return MP_GT;
+} else if (a->dp[0] < b) {
+return MP_LT;
+} else {
+return MP_EQ;
+}
+}

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