view libtommath/bn_mp_to_unsigned_bin.c @ 320:08b69964e408 agent-client

propagate from branch 'au.asn.ucc.matt.dropbear' (head 138a11bc1e2babcd8b1182e6cb2a85d4e9404b11) to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 12b2f59db65e7339d340e95ac67d6d9ddb193c2b)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 06 Jun 2006 15:40:09 +0000
parents eed26cff980b
children 5ff8218bcee9
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, [email protected], http://math.libtomcrypt.org
 */

/* 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