dropbear: bn_mp_rand.c comparison

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

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+:91fbc376f010
+#include <tommath.h>
+#ifdef BN_MP_RAND_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
+*/
+/* makes a pseudo-random int of a given size */
+int
+mp_rand (mp_int * a, int digits)
+{
+int     res;
+mp_digit d;
+mp_zero (a);
+if (digits <= 0) {
+return MP_OKAY;
+}
+/* first place a random non-zero digit */
+do {
+d = ((mp_digit) abs (rand ())) & MP_MASK;
+} while (d == 0);
+if ((res = mp_add_d (a, d, a)) != MP_OKAY) {
+return res;
+}
+while (--digits > 0) {
+if ((res = mp_lshd (a, 1)) != MP_OKAY) {
+return res;
+}
+if ((res = mp_add_d (a, ((mp_digit) abs (rand ())), a)) != MP_OKAY) {
+return res;
+}
+}
+return MP_OKAY;
+}
+#endif

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