dropbear: bn_mp_and.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_AND_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
+*/
+/* AND two ints together */
+int
+mp_and (mp_int * a, mp_int * b, mp_int * c)
+{
+int     res, ix, px;
+mp_int  t, *x;
+if (a->used > b->used) {
+if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
+return res;
+}
+px = b->used;
+x = b;
+} else {
+if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
+return res;
+}
+px = a->used;
+x = a;
+}
+for (ix = 0; ix < px; ix++) {
+t.dp[ix] &= x->dp[ix];
+}
+/* zero digits above the last from the smallest mp_int */
+for (; ix < t.used; ix++) {
+t.dp[ix] = 0;
+}
+mp_clamp (&t);
+mp_exch (c, &t);
+mp_clear (&t);
+return MP_OKAY;
+}
+#endif

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