Commit e6dc6b62 authored by Niels Möller's avatar Niels Möller

* nettle-write.h: New file.

* write-be32.c (nettle_write_be32): New file, new function.

Rev: nettle/nettle-write.h:1.1
Rev: nettle/write-be32.c:1.1
parent aeea048d
/* nettle-write.h
*
* Prototypes for some internal functions to write out word-sized data
* to byte arrays. */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2010 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#ifndef NETTLE_WRITE_H_INCLUDED
#define NETTLE_WRITE_H_INCLUDED
#include "nettle-stdint.h"
/* Write the word array at SRC to the byte array at DST, using little
endian (le) or big endian (be) byte order, and truncating the
result to LENGTH bytes. */
void
_nettle_write_be32(unsigned length, uint8_t *dst,
uint32_t *src);
void
_nettle_write_le32(unsigned length, uint8_t *dst,
uint32_t *src);
void
_nettle_write_be64(unsigned length, uint8_t *dst,
uint64_t *src);
#endif /* NETTLE_WRITE_H_INCLUDED */
/* write-be32.c */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Mller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include "nettle-write.h"
#include "macros.h"
void
_nettle_write_be32(unsigned length, uint8_t *dst,
uint32_t *src)
{
unsigned i;
unsigned words;
unsigned leftover;
words = length / 4;
leftover = length % 4;
for (i = 0; i < words; i++, dst += 4)
WRITE_UINT32(dst, src[i]);
if (leftover)
{
uint32_t word;
unsigned j = leftover;
word = src[i];
switch (leftover)
{
default:
abort();
case 3:
dst[--j] = (word >> 8) & 0xff;
/* Fall through */
case 2:
dst[--j] = (word >> 16) & 0xff;
/* Fall through */
case 1:
dst[--j] = (word >> 24) & 0xff;
}
}
}
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