Mercurial > dropbear
view libtommath/bn_mp_to_unsigned_bin.c @ 779:095b46180bbc
Added tag DROPBEAR_2013.57 for changeset 96b8bcb88017
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Mon, 15 Apr 2013 22:10:49 +0800 (2013-04-15) |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
line wrap: on
line source
#include <tommath.h> #ifdef BN_MP_TO_UNSIGNED_BIN_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@gmail.com, http://math.libtomcrypt.com */ /* store in unsigned [big endian] format */ int mp_to_unsigned_bin (mp_int * a, unsigned char *b) { int x, res; mp_int t; if ((res = mp_init_copy (&t, a)) != MP_OKAY) { return res; } x = 0; while (mp_iszero (&t) == 0) { #ifndef MP_8BIT b[x++] = (unsigned char) (t.dp[0] & 255); #else b[x++] = (unsigned char) (t.dp[0] | ((t.dp[1] & 0x01) << 7)); #endif if ((res = mp_div_2d (&t, 8, &t, NULL)) != MP_OKAY) { mp_clear (&t); return res; } } bn_reverse (b, x); mp_clear (&t); return MP_OKAY; } #endif /* $Source: /cvs/libtom/libtommath/bn_mp_to_unsigned_bin.c,v $ */ /* $Revision: 1.3 $ */ /* $Date: 2006/03/31 14:18:44 $ */