dropbear: bn_mp_read_unsigned

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_READ_UNSIGNED_BIN_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
+*/
+/* reads a unsigned char array, assumes the msb is stored first [big endian] */
+int
+mp_read_unsigned_bin (mp_int * a, unsigned char *b, int c)
+{
+int     res;
+/* make sure there are at least two digits */
+if (a->alloc < 2) {
+if ((res = mp_grow(a, 2)) != MP_OKAY) {
+return res;
+}
+}
+/* zero the int */
+mp_zero (a);
+/* read the bytes in */
+while (c-- > 0) {
+if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) {
+return res;
+}
+#ifndef MP_8BIT
+a->dp[0] |= *b++;
+a->used += 1;
+#else
+a->dp[0] = (*b & MP_MASK);
+a->dp[1] |= ((*b++ >> 7U) & 1);
+a->used += 2;
+#endif
+}
+mp_clamp (a);
+return MP_OKAY;
+}
+#endif

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