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dropbear/bn_mp_shrink.c
Matt Johnston 1c5fda515f Import of libtommath 0.35
From ltm-0.35.tar.bz2 SHA1 of 3f193dbae9351e92d02530994fa18236f7fde01c

--HG--
branch : libtommath-orig
extra : convert_revision : 2b4b13ac88b2a81e5c86ba868c92c6a452630e02
2006-03-08 13:16:18 +00:00

32 lines
866 B
C

#include <tommath.h>
#ifdef BN_MP_SHRINK_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
*/
/* shrink a bignum */
int mp_shrink (mp_int * a)
{
mp_digit *tmp;
if (a->alloc != a->used && a->used > 0) {
if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * a->used)) == NULL) {
return MP_MEM;
}
a->dp = tmp;
a->alloc = a->used;
}
return MP_OKAY;
}
#endif