Mercurial > dropbear
diff bn_mp_init_size.c @ 1:22d5cf7d4b1a libtommath
Renaming branch
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 31 May 2004 18:23:46 +0000 |
parents | |
children | d29b64170cf0 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/bn_mp_init_size.c Mon May 31 18:23:46 2004 +0000 @@ -0,0 +1,33 @@ +/* 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, [email protected], http://math.libtomcrypt.org + */ +#include <tommath.h> + +/* init an mp_init for a given size */ +int mp_init_size (mp_int * a, int size) +{ + /* pad size so there are always extra digits */ + size += (MP_PREC * 2) - (size % MP_PREC); + + /* alloc mem */ + a->dp = OPT_CAST(mp_digit) XCALLOC (sizeof (mp_digit), size); + if (a->dp == NULL) { + return MP_MEM; + } + a->used = 0; + a->alloc = size; + a->sign = MP_ZPOS; + + return MP_OKAY; +}