qemu/crypto/blockpriv.h
Vladimir Sementsov-Ogievskiy c972fa123c crypto: support multiple threads accessing one QCryptoBlock
The two thing that should be handled are cipher and ivgen. For ivgen
the solution is just mutex, as iv calculations should not be long in
comparison with encryption/decryption. And for cipher let's just keep
per-thread ciphers.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-12 11:16:49 +00:00

128 lines
4.3 KiB
C

/*
* QEMU Crypto block device encryption
*
* Copyright (c) 2015-2016 Red Hat, Inc.
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QCRYPTO_BLOCKPRIV_H
#define QCRYPTO_BLOCKPRIV_H
#include "crypto/block.h"
#include "qemu/thread.h"
typedef struct QCryptoBlockDriver QCryptoBlockDriver;
struct QCryptoBlock {
QCryptoBlockFormat format;
const QCryptoBlockDriver *driver;
void *opaque;
QCryptoCipher **ciphers;
size_t n_ciphers;
size_t n_free_ciphers;
QCryptoIVGen *ivgen;
QemuMutex mutex;
QCryptoHashAlgorithm kdfhash;
size_t niv;
uint64_t payload_offset; /* In bytes */
uint64_t sector_size; /* In bytes */
};
struct QCryptoBlockDriver {
int (*open)(QCryptoBlock *block,
QCryptoBlockOpenOptions *options,
const char *optprefix,
QCryptoBlockReadFunc readfunc,
void *opaque,
unsigned int flags,
size_t n_threads,
Error **errp);
int (*create)(QCryptoBlock *block,
QCryptoBlockCreateOptions *options,
const char *optprefix,
QCryptoBlockInitFunc initfunc,
QCryptoBlockWriteFunc writefunc,
void *opaque,
Error **errp);
int (*get_info)(QCryptoBlock *block,
QCryptoBlockInfo *info,
Error **errp);
void (*cleanup)(QCryptoBlock *block);
int (*encrypt)(QCryptoBlock *block,
uint64_t startsector,
uint8_t *buf,
size_t len,
Error **errp);
int (*decrypt)(QCryptoBlock *block,
uint64_t startsector,
uint8_t *buf,
size_t len,
Error **errp);
bool (*has_format)(const uint8_t *buf,
size_t buflen);
};
int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
int qcrypto_block_decrypt_helper(QCryptoBlock *block,
int sectorsize,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
int qcrypto_block_encrypt_helper(QCryptoBlock *block,
int sectorsize,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
int qcrypto_block_init_cipher(QCryptoBlock *block,
QCryptoCipherAlgorithm alg,
QCryptoCipherMode mode,
const uint8_t *key, size_t nkey,
size_t n_threads, Error **errp);
void qcrypto_block_free_cipher(QCryptoBlock *block);
#endif /* QCRYPTO_BLOCKPRIV_H */