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28 lines
673 B
28 lines
673 B
#include "tommath_private.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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/* SPDX-License-Identifier: Unlicense */
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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 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] == 0u)) {
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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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