76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "plugin/keyring/checker/checker_ver_2_0.h"
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#include <mysql/psi/mysql_file.h>
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#include "my_compiler.h"
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#include "plugin/keyring/digest.h"
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namespace keyring {
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bool CheckerVer_2_0::is_file_size_correct(size_t file_size) {
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return file_size >=
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((size_t)EOF_TAG_SIZE + file_version.length() + SHA256_DIGEST_LENGTH);
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}
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bool CheckerVer_2_0::file_seek_to_tag(File file) {
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return mysql_file_seek(file,
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-static_cast<int>(EOF_TAG_SIZE + SHA256_DIGEST_LENGTH),
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MY_SEEK_END, MYF(0)) == MY_FILEPOS_ERROR;
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}
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// Checks if the digest stored in the keyring is the same as the dgst argument
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// in case dgst argument is empty it will assign a digest read from the file
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//(if it exists) to dgst argument
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bool CheckerVer_2_0::is_dgst_correct(File file, Digest *digest) {
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static Digest dgst_read_from_file;
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if (unlikely(mysql_file_seek(file, -SHA256_DIGEST_LENGTH, MY_SEEK_END,
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MYF(0)) == MY_FILEPOS_ERROR) ||
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mysql_file_read(file, dgst_read_from_file.value, SHA256_DIGEST_LENGTH,
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MYF(0)) != SHA256_DIGEST_LENGTH)
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return false;
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dgst_read_from_file.is_empty = false;
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if (strncmp(dummy_digest, reinterpret_cast<const char *>(digest->value),
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SHA256_DIGEST_LENGTH) == 0) {
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*digest = dgst_read_from_file;
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return true;
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}
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mysql_file_seek(file, 0, MY_SEEK_SET, MYF(0));
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return *digest == dgst_read_from_file;
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}
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/**
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calculates the size of end-of-file data for particular format
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- it includes fixed size data after the last key in file
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@return size of end-of-file data
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*/
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size_t CheckerVer_2_0::eof_size() {
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return EOF_TAG_SIZE + SHA256_DIGEST_LENGTH;
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}
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} // namespace keyring
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