+#include <tommath.h>
+#ifdef BN_MP_ABS_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
- * LibTomMath is library that provides for multiple-precision
+ * LibTomMath is a library that provides multiple-precision
* integer arithmetic as well as number theoretic functionality.
*
- * The library is designed directly after the MPI library by
+ * The library was designed directly after the MPI library by
* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
*
* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
*/
-#include <tommath.h>
/* b = |a|
*
mp_abs (mp_int * a, mp_int * b)
{
int res;
- if ((res = mp_copy (a, b)) != MP_OKAY) {
- return res;
+
+ /* copy a to b */
+ if (a != b) {
+ if ((res = mp_copy (a, b)) != MP_OKAY) {
+ return res;
+ }
}
+
+ /* force the sign of b to positive */
b->sign = MP_ZPOS;
+
return MP_OKAY;
}
+#endif