bn_mp_init_size.c
Go to the documentation of this file.00001 #include <tommath.h> 00002 #ifdef BN_MP_INIT_SIZE_C 00003 /* LibTomMath, multiple-precision integer library -- Tom St Denis 00004 * 00005 * LibTomMath is a library that provides multiple-precision 00006 * integer arithmetic as well as number theoretic functionality. 00007 * 00008 * The library was designed directly after the MPI library by 00009 * Michael Fromberger but has been written from scratch with 00010 * additional optimizations in place. 00011 * 00012 * The library is free for all purposes without any express 00013 * guarantee it works. 00014 * 00015 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com 00016 */ 00017 00018 /* init an mp_init for a given size */ 00019 int mp_init_size (mp_int * a, int size) 00020 { 00021 int x; 00022 00023 /* pad size so there are always extra digits */ 00024 size += (MP_PREC * 2) - (size % MP_PREC); 00025 00026 /* alloc mem */ 00027 a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size); 00028 if (a->dp == NULL) { 00029 return MP_MEM; 00030 } 00031 00032 /* set the members */ 00033 a->used = 0; 00034 a->alloc = size; 00035 a->sign = MP_ZPOS; 00036 00037 /* zero the digits */ 00038 for (x = 0; x < size; x++) { 00039 a->dp[x] = 0; 00040 } 00041 00042 return MP_OKAY; 00043 } 00044 #endif 00045 00046 /* $Source: /cvsroot/tcl/libtommath/bn_mp_init_size.c,v $ */ 00047 /* $Revision: 1.1.1.3 $ */ 00048 /* $Date: 2006/12/01 00:08:11 $ */
Generated on Wed Mar 12 12:18:24 2008 by
1.5.1