tommath/bn_mp_reduce_is_2k.c

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#include "tommath_private.h"
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#ifdef BN_MP_REDUCE_IS_2K_C
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/* 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.
*
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* SPDX-License-Identifier: Unlicense
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*/
/* determines if mp_reduce_2k can be used */
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int mp_reduce_is_2k(const mp_int *a)
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{
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int ix, iy, iw;
mp_digit iz;
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if (a->used == 0) {
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return MP_NO;
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} else if (a->used == 1) {
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return MP_YES;
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} else if (a->used > 1) {
iy = mp_count_bits(a);
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iz = 1;
iw = 1;
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/* Test every bit from the second digit up, must be 1 */
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for (ix = DIGIT_BIT; ix < iy; ix++) {
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if ((a->dp[iw] & iz) == 0u) {
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return MP_NO;
}
iz <<= 1;
if (iz > (mp_digit)MP_MASK) {
++iw;
iz = 1;
}
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}
}
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return MP_YES;
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}
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#endif
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/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */