qemu/crypto/blockpriv.h
Daniel P. Berrange 1cd9a787a2 block: pass option prefix down to crypto layer
While the crypto layer uses a fixed option name "key-secret",
the upper block layer may have a prefix on the options. e.g.
"encrypt.key-secret", in order to avoid clashes between crypto
option names & other block option names. To ensure the crypto
layer can report accurate error messages, we must tell it what
option name prefix was used.

Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170623162419.26068-19-berrange@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11 17:44:56 +02:00

99 lines
3.1 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"
typedef struct QCryptoBlockDriver QCryptoBlockDriver;
struct QCryptoBlock {
QCryptoBlockFormat format;
const QCryptoBlockDriver *driver;
void *opaque;
QCryptoCipher *cipher;
QCryptoIVGen *ivgen;
QCryptoHashAlgorithm kdfhash;
size_t niv;
uint64_t payload_offset; /* In bytes */
};
struct QCryptoBlockDriver {
int (*open)(QCryptoBlock *block,
QCryptoBlockOpenOptions *options,
const char *optprefix,
QCryptoBlockReadFunc readfunc,
void *opaque,
unsigned int flags,
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_decrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint8_t *buf,
size_t len,
Error **errp);
int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint8_t *buf,
size_t len,
Error **errp);
#endif /* QCRYPTO_BLOCKPRIV_H */