850f49de9b
While current encryption schemes all have a fixed sector size of 512 bytes, this is not guaranteed to be the case in future. Expose the sector size in the APIs so the block layer can remove assumptions about fixed 512 byte sectors. Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170927125340.12360-3-berrange@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/*
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* QEMU Crypto block device encryption
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*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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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 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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QCRYPTO_BLOCKPRIV_H
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#define QCRYPTO_BLOCKPRIV_H
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#include "crypto/block.h"
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typedef struct QCryptoBlockDriver QCryptoBlockDriver;
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struct QCryptoBlock {
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QCryptoBlockFormat format;
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const QCryptoBlockDriver *driver;
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void *opaque;
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QCryptoCipher *cipher;
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QCryptoIVGen *ivgen;
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QCryptoHashAlgorithm kdfhash;
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size_t niv;
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uint64_t payload_offset; /* In bytes */
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uint64_t sector_size; /* In bytes */
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};
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struct QCryptoBlockDriver {
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int (*open)(QCryptoBlock *block,
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QCryptoBlockOpenOptions *options,
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const char *optprefix,
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QCryptoBlockReadFunc readfunc,
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void *opaque,
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unsigned int flags,
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Error **errp);
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int (*create)(QCryptoBlock *block,
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QCryptoBlockCreateOptions *options,
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const char *optprefix,
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QCryptoBlockInitFunc initfunc,
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QCryptoBlockWriteFunc writefunc,
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void *opaque,
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Error **errp);
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int (*get_info)(QCryptoBlock *block,
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QCryptoBlockInfo *info,
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Error **errp);
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void (*cleanup)(QCryptoBlock *block);
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int (*encrypt)(QCryptoBlock *block,
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uint64_t startsector,
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uint8_t *buf,
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size_t len,
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Error **errp);
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int (*decrypt)(QCryptoBlock *block,
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uint64_t startsector,
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uint8_t *buf,
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size_t len,
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Error **errp);
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bool (*has_format)(const uint8_t *buf,
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size_t buflen);
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};
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int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
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size_t niv,
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QCryptoIVGen *ivgen,
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int sectorsize,
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uint64_t startsector,
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uint8_t *buf,
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size_t len,
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Error **errp);
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int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
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size_t niv,
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QCryptoIVGen *ivgen,
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int sectorsize,
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uint64_t startsector,
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uint8_t *buf,
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size_t len,
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Error **errp);
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#endif /* QCRYPTO_BLOCKPRIV_H */
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