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46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include <tommath.h>
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#ifdef BN_MP_GET_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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* 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, tomstdenis@gmail.com, http://math.libtomcrypt.com
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*/
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/* get the lower 32-bits of an mp_int */
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unsigned long mp_get_int(mp_int * a)
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{
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int i;
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unsigned long res;
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if (a->used == 0) {
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return 0;
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}
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/* get number of digits of the lsb we have to read */
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i = MIN(a->used,(int)((sizeof(unsigned long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
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/* get most significant digit of result */
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res = DIGIT(a,i);
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while (--i >= 0) {
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res = (res << DIGIT_BIT) | DIGIT(a,i);
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}
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/* force result to 32-bits always so it is consistent on non 32-bit platforms */
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return res & 0xFFFFFFFFUL;
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}
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#endif
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/* $Source: /cvs/libtom/libtommath/bn_mp_get_int.c,v $ */
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/* $Revision: 1.3 $ */
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/* $Date: 2006/03/31 14:18:44 $ */
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