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to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64) --HG-- extra : convert_revision : fdf4a7a3b97ae5046139915de7e40399cceb2c01
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#include <tommath.h>
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#ifdef BN_MP_CLAMP_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
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*/
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/* trim unused digits
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*
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* This is used to ensure that leading zero digits are
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* trimed and the leading "used" digit will be non-zero
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* Typically very fast. Also fixes the sign if there
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* are no more leading digits
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*/
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void
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mp_clamp (mp_int * a)
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{
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/* decrease used while the most significant digit is
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* zero.
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*/
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while (a->used > 0 && a->dp[a->used - 1] == 0) {
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--(a->used);
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}
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/* reset the sign flag if used == 0 */
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if (a->used == 0) {
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a->sign = MP_ZPOS;
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}
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}
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#endif
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