46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include "tommath_private.h"
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#ifdef BN_MP_SET_INT_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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* SPDX-License-Identifier: Unlicense
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*/
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/* set a 32-bit const */
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int mp_set_int(mp_int *a, unsigned long b)
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{
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int x, res;
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mp_zero(a);
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/* set four bits at a time */
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for (x = 0; x < 8; x++) {
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/* shift the number up four bits */
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if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) {
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return res;
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}
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/* OR in the top four bits of the source */
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a->dp[0] |= (mp_digit)(b >> 28) & 15uL;
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/* shift the source up to the next four bits */
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b <<= 4;
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/* ensure that digits are not clamped off */
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a->used += 1;
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}
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mp_clamp(a);
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return MP_OKAY;
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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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