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/*****************************************************************************
Copyright (c) 2015, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/fil0fil.h
The low-level file system encryption support functions
Created 04/01/2015 Jan Lindström
*******************************************************/
/*******************************************************************//**
Find out whether the page is page encrypted
@return true if page is page encrypted, false if not */
UNIV_INLINE
bool
fil_page_is_encrypted(
/*==================*/
const byte *buf) /*!< in: page */
{
return(mach_read_from_4(buf+FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION) != 0);
}
/*******************************************************************//**
Find out whether the page can be decrypted.
The function for decrypting the page should already be executed before this.
@return PAGE_ENCRYPTION_KEY_MISSING if key provider is available, but key is not available
0 if decryption should be possible
*/
UNIV_INLINE
ulint
fil_page_encryption_status(
/*===================*/
const byte *buf, /*!< in: page */
ulint space_id) /*!< in: space_id */
{
ulint page_type = mach_read_from_2(buf+FIL_PAGE_TYPE);
if (page_type == FIL_PAGE_TYPE_FSP_HDR) {
fil_space_crypt_t *crypt_data = fil_space_get_crypt_data(space_id);
if (crypt_data != NULL) {
if (!has_encryption_key(crypt_data->keys[0].key_version)) {
/* accessing table would surely fail, because no key or no key provider available */
return FIL_ENCRYPTION_KEY_MISSING;
}
}
} else {
ulint key = mach_read_from_4(buf + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION);
if (!has_encryption_key(key)) {
return FIL_ENCRYPTION_KEY_MISSING;
}
}
return 0;
}
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