37 lines
952 B
C
37 lines
952 B
C
#include "tommath_private.h"
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#ifdef BN_MP_TC_DIV_2D_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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/* two complement right shift */
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int mp_tc_div_2d(const mp_int *a, int b, mp_int *c)
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{
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int res;
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if (mp_isneg(a) == MP_NO) {
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return mp_div_2d(a, b, c, NULL);
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}
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res = mp_add_d(a, 1uL, c);
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if (res != MP_OKAY) {
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return res;
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}
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res = mp_div_2d(c, b, c, NULL);
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return (res == MP_OKAY) ? mp_sub_d(c, 1uL, c) : res;
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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