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TCRYPT: add backup header option.

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This commit is contained in:
Milan Broz
2012-11-26 13:15:08 +01:00
parent 1b191e14d0
commit 17a8e85cb8
3 changed files with 26 additions and 9 deletions
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25
lib/tcrypt/tcrypt.c
View File

@@ -528,7 +528,7 @@ int TCRYPT_read_phdr(struct crypt_device *cd,
{
struct device *device = crypt_metadata_device(cd);
ssize_t hdr_size = sizeof(struct tcrypt_phdr);
int devfd = 0, r = -EIO, bs;
int devfd = 0, r, bs;
assert(sizeof(struct tcrypt_phdr) == 512);
@@ -545,13 +545,24 @@ int TCRYPT_read_phdr(struct crypt_device *cd,
return -EINVAL;
}
r = -EIO;
if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
if (lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET, SEEK_SET) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
if (r &&
lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET_OLD, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
if (lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET_BCK, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
} else {
if (lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET, SEEK_SET) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
if (r &&
lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET_OLD, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
}
} else if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
if (lseek(devfd, TCRYPT_HDR_OFFSET_BCK, SEEK_END) >= 0 &&
read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
} else if (read_blockwise(devfd, bs, hdr, hdr_size) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);

3
lib/tcrypt/tcrypt.h
View File

@@ -33,6 +33,9 @@
#define TCRYPT_HDR_HIDDEN_OFFSET_OLD -1536
#define TCRYPT_HDR_HIDDEN_OFFSET 65536
#define TCRYPT_HDR_HIDDEN_OFFSET_BCK -65536
#define TCRYPT_HDR_OFFSET_BCK -131072
#define TCRYPT_LRW_IKEY_LEN 16
#define TCRYPT_KEY_POOL_LEN 64
#define TCRYPT_KEYFILE_LEN 1048576