77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/* write-be32.c
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Copyright (C) 2001 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include "nettle-write.h"
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#include "macros.h"
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void
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_nettle_write_be32(size_t length, uint8_t *dst,
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const uint32_t *src)
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{
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size_t i;
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size_t words;
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unsigned leftover;
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words = length / 4;
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leftover = length % 4;
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for (i = 0; i < words; i++, dst += 4)
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WRITE_UINT32(dst, src[i]);
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if (leftover)
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{
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uint32_t word;
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unsigned j = leftover;
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word = src[i];
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switch (leftover)
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{
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default:
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abort();
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case 3:
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dst[--j] = (word >> 8) & 0xff;
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/* Fall through */
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case 2:
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dst[--j] = (word >> 16) & 0xff;
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/* Fall through */
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case 1:
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dst[--j] = (word >> 24) & 0xff;
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}
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}
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}
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