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crypto: expose encryption sector size in APIs

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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>
This commit is contained in:
Daniel P. Berrange 2017-09-27 13:53:36 +01:00 committed by Max Reitz
parent 161253e2d0
commit 850f49de9b
5 changed files with 27 additions and 2 deletions
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6
crypto/block-luks.c
View File

@ -846,8 +846,9 @@ qcrypto_block_luks_open(QCryptoBlock *block,
}
}
block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->payload_offset = luks->header.payload_offset *
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->sector_size;
luks->cipher_alg = cipheralg;
luks->cipher_mode = ciphermode;
@ -1240,8 +1241,9 @@ qcrypto_block_luks_create(QCryptoBlock *block,
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) *
QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS);
block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->payload_offset = luks->header.payload_offset *
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->sector_size;
/* Reserve header space to match payload offset */
initfunc(block, block->payload_offset, opaque, &local_err);

1
crypto/block-qcow.c
View File

@ -80,6 +80,7 @@ qcrypto_block_qcow_init(QCryptoBlock *block,
goto fail;
}
block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
block->payload_offset = 0;
return 0;

6
crypto/block.c
View File

@ -170,6 +170,12 @@ uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block)
}
uint64_t qcrypto_block_get_sector_size(QCryptoBlock *block)
{
return block->sector_size;
}
void qcrypto_block_free(QCryptoBlock *block)
{
if (!block) {

1
crypto/blockpriv.h
View File

@ -36,6 +36,7 @@ struct QCryptoBlock {
QCryptoHashAlgorithm kdfhash;
size_t niv;
uint64_t payload_offset; /* In bytes */
uint64_t sector_size; /* In bytes */
};
struct QCryptoBlockDriver {

15
include/crypto/block.h
View File

@ -240,6 +240,21 @@ QCryptoHashAlgorithm qcrypto_block_get_kdf_hash(QCryptoBlock *block);
*/
uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block);
/**
* qcrypto_block_get_sector_size:
* @block: the block encryption object
*
* Get the size of sectors used for payload encryption. A new
* IV is used at the start of each sector. The encryption
* sector size is not required to match the sector size of the
* underlying storage. For example LUKS will always use a 512
* byte sector size, even if the volume is on a disk with 4k
* sectors.
*
* Returns: the sector in bytes
*/
uint64_t qcrypto_block_get_sector_size(QCryptoBlock *block);
/**
* qcrypto_block_free:
* @block: the block encryption object