ca5bb76d2b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18012 a1c6a512-1295-4272-9138-f99709370657
137 lines
3 KiB
C
137 lines
3 KiB
C
/*
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* Copyright (c) 2000, 2002 Virtual Unlimited B.V.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*!\file blockmode.c
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* \brief Blockcipher operation modes.
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* \author Bob Deblier <bob.deblier@pandora.be>
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* \ingroup BC_m
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*/
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#define BEECRYPT_DLL_EXPORT
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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 "beecrypt/blockmode.h"
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int blockEncryptECB(const blockCipher* bc, blockCipherParam* bp, uint32_t* dst, const uint32_t* src, unsigned int nblocks)
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{
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register const unsigned int blockwords = bc->blocksize >> 2;
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while (nblocks > 0)
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{
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bc->raw.encrypt(bp, dst, src);
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dst += blockwords;
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src += blockwords;
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nblocks--;
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}
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return 0;
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}
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int blockDecryptECB(const blockCipher* bc, blockCipherParam* bp, uint32_t* dst, const uint32_t* src, unsigned int nblocks)
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{
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register const unsigned int blockwords = bc->blocksize >> 2;
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while (nblocks > 0)
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{
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bc->raw.decrypt(bp, dst, src);
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dst += blockwords;
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src += blockwords;
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nblocks--;
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}
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return 0;
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}
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int blockEncryptCBC(const blockCipher* bc, blockCipherParam* bp, uint32_t* dst, const uint32_t* src, unsigned int nblocks)
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{
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register const unsigned int blockwords = bc->blocksize >> 2;
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register uint32_t* fdback = bc->getfb(bp);
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if (nblocks > 0)
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{
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register unsigned int i;
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for (i = 0; i < blockwords; i++)
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dst[i] = src[i] ^ fdback[i];
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bc->raw.encrypt(bp, dst, dst);
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nblocks--;
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while (nblocks > 0)
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{
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for (i = 0; i < blockwords; i++)
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dst[i+blockwords] = src[i+blockwords] ^ dst[i];
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dst += blockwords;
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bc->raw.encrypt(bp, dst, dst);
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src += blockwords;
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nblocks--;
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}
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for (i = 0; i < blockwords; i++)
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fdback[i] = dst[i];
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}
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return 0;
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}
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int blockDecryptCBC(const blockCipher* bc, blockCipherParam* bp, uint32_t* dst, const uint32_t* src, unsigned int nblocks)
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{
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register const unsigned int blockwords = bc->blocksize >> 2;
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register uint32_t* fdback = bc->getfb(bp);
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register uint32_t* buf = (uint32_t*) malloc(blockwords * sizeof(uint32_t));
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if (buf)
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{
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while (nblocks > 0)
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{
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register uint32_t tmp;
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register unsigned int i;
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bc->raw.decrypt(bp, buf, src);
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for (i = 0; i < blockwords; i++)
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{
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tmp = src[i];
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dst[i] = buf[i] ^ fdback[i];
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fdback[i] = tmp;
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}
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dst += blockwords;
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src += blockwords;
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nblocks--;
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}
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free(buf);
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return 0;
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}
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return -1;
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}
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