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TCRYPT: support crypt_volume_key_get

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This commit is contained in:
Milan Broz
2012-11-23 15:20:46 +01:00
parent 6ab93841e9
commit 8d69e19ac1
3 changed files with 37 additions and 1 deletions
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29
lib/tcrypt/tcrypt.c
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@@ -737,3 +737,32 @@ uint64_t TCRYPT_get_iv_offset(struct tcrypt_phdr *hdr)
return 0;
return (hdr->d.mk_offset / hdr->d.sector_size);
}
int TCRYPT_get_volume_key(struct crypt_device *cd,
struct tcrypt_phdr *hdr,
struct crypt_params_tcrypt *params,
struct volume_key **vk)
{
int i, num_keys = 1, key_size;
const char *c;
if (!hdr->d.version) {
log_dbg("TCRYPT: this function is not supported without encrypted header load.");
return -ENOTSUP;
}
*vk = crypt_alloc_volume_key(params->key_size, NULL);
if (!*vk)
return -ENOMEM;
for (num_keys = 0, c = params->cipher; c ; num_keys++)
c = strchr(++c, '-');
key_size = params->key_size / num_keys;
for (i = 0; i < num_keys; i++)
copy_key(&(*vk)->key[key_size * i], hdr->d.keys, num_keys - 1,
key_size, i, params->mode);
return 0;
}