| #include <tommath.h> |
| #ifdef BN_MP_CLAMP_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, tomstdenis@iahu.ca, http://math.libtomcrypt.org |
| */ |
| |
| /* trim unused digits |
| * |
| * This is used to ensure that leading zero digits are |
| * trimed and the leading "used" digit will be non-zero |
| * Typically very fast. Also fixes the sign if there |
| * are no more leading digits |
| */ |
| void |
| mp_clamp (mp_int * a) |
| { |
| /* decrease used while the most significant digit is |
| * zero. |
| */ |
| while (a->used > 0 && a->dp[a->used - 1] == 0) { |
| --(a->used); |
| } |
| |
| /* reset the sign flag if used == 0 */ |
| if (a->used == 0) { |
| a->sign = MP_ZPOS; |
| } |
| } |
| #endif |