release/src/router/nettle/write-le64.c

   1 /* write-le64.c */
   2
   3 /* nettle, low-level cryptographics library
   4  *
   5  * Copyright (C) 2001, 2011, 2012 Niels Möller
   6  *
   7  * The nettle library is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU Lesser General Public License as published by
   9  * the Free Software Foundation; either version 2.1 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * The nettle library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA 02111-1301, USA.
  21  */
  22
  23 #if HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #include "nettle-write.h"
  28
  29 #include "macros.h"
  30
  31 void
  32 _nettle_write_le64(unsigned length, uint8_t *dst,
  33                    uint64_t *src)
  34 {
  35   unsigned i;
  36   unsigned words;
  37   unsigned leftover;
  38
  39   words = length / 8;
  40   leftover = length % 8;
  41
  42   for (i = 0; i < words; i++, dst += 8)
  43     LE_WRITE_UINT64(dst, src[i]);
  44
  45   if (leftover)
  46     {
  47       uint64_t word;
  48
  49       word = src[i];
  50
  51       do
  52         {
  53           *dst++ = word & 0xff;
  54           word >>= 8;
  55         }
  56       while (--leftover);
  57     }
  58 }