7d9690148a
Add a generic framework for supporting different block encryption formats. Upon instantiating a QCryptoBlock object, it will read the encryption header and extract the encryption keys. It is then possible to call methods to encrypt/decrypt data buffers. There is also a mode whereby it will create/initialize a new encryption header on a previously unformatted volume. The initial framework comes with support for the legacy QCow AES based encryption. This enables code in the QCow driver to be consolidated later. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
93 lines
2.9 KiB
C
93 lines
2.9 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_BLOCK_PRIV_H__
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#define QCRYPTO_BLOCK_PRIV_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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};
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struct QCryptoBlockDriver {
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int (*open)(QCryptoBlock *block,
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QCryptoBlockOpenOptions *options,
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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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QCryptoBlockInitFunc initfunc,
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QCryptoBlockWriteFunc writefunc,
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void *opaque,
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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_BLOCK_PRIV_H__ */
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