mirror of
https://github.com/clearml/dropbear
synced 2025-05-16 17:43:23 +00:00
1c5fda515f
From ltm-0.35.tar.bz2 SHA1 of 3f193dbae9351e92d02530994fa18236f7fde01c --HG-- branch : libtommath-orig extra : convert_revision : 2b4b13ac88b2a81e5c86ba868c92c6a452630e02
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include <tommath.h>
|
|
#ifdef BN_MP_GET_INT_C
|
|
/* 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.
|
|
*
|
|
* The library is free for all purposes without any express
|
|
* guarantee it works.
|
|
*
|
|
* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
|
|
*/
|
|
|
|
/* get the lower 32-bits of an mp_int */
|
|
unsigned long mp_get_int(mp_int * a)
|
|
{
|
|
int i;
|
|
unsigned long res;
|
|
|
|
if (a->used == 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* get number of digits of the lsb we have to read */
|
|
i = MIN(a->used,(int)((sizeof(unsigned long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
|
|
|
|
/* get most significant digit of result */
|
|
res = DIGIT(a,i);
|
|
|
|
while (--i >= 0) {
|
|
res = (res << DIGIT_BIT) | DIGIT(a,i);
|
|
}
|
|
|
|
/* force result to 32-bits always so it is consistent on non 32-bit platforms */
|
|
return res & 0xFFFFFFFFUL;
|
|
}
|
|
#endif
|