35 lines
987 B
C
35 lines
987 B
C
#include <tommath_private.h>
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#ifdef BN_MP_REDUCE_SETUP_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, tstdenis82@gmail.com, http://libtom.org
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*/
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/* pre-calculate the value required for Barrett reduction
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* For a given modulus "b" it calulates the value required in "a"
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*/
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int mp_reduce_setup(mp_int *a, const mp_int *b)
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{
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int res;
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if ((res = mp_2expt(a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
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return res;
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}
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return mp_div(a, b, a, NULL);
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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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