/* Copyright (c) 2001, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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,
   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

#include "my_global.h"          // HAVE_*
#include "des_key_file.h"       // st_des_keyschedule, st_des_keyblock
#include "log.h"                // sql_print_error
#include <m_ctype.h>

#include "pfs_file_provider.h"
#include "mysql/psi/mysql_file.h"

#ifdef HAVE_OPENSSL

struct st_des_keyschedule des_keyschedule[10];
uint   des_default_key;

#define des_cs	&my_charset_latin1

/**
  Load DES keys from plaintext file into
  memory on MySQL server startup and on command FLUSH DES_KEY_FILE.

  @retval
    0  ok
  @retval
    1  Error   
*/


bool
load_des_key_file(const char *file_name)
{
  bool result=1;
  File file;
  IO_CACHE io;
  DBUG_ENTER("load_des_key_file");
  DBUG_PRINT("enter",("name: %s",file_name));

  mysql_mutex_lock(&LOCK_des_key_file);
  if ((file= mysql_file_open(key_file_des_key_file, file_name,
                             O_RDONLY | O_BINARY, MYF(MY_WME))) < 0 ||
      init_io_cache(&io, file, IO_SIZE*2, READ_CACHE, 0, 0, MYF(MY_WME)))
    goto error;

  memset(des_keyschedule, 0, sizeof(struct st_des_keyschedule) * 10);
  des_default_key=15;				// Impossible key
  for (;;)
  {
    char *start, *end;
    char buf[1024], offset;
    st_des_keyblock keyblock;
    size_t length;

    if (!(length=my_b_gets(&io,buf,sizeof(buf)-1)))
      break;					// End of file
    offset=buf[0];
    if (offset >= '0' && offset <= '9')		// If ok key
    {
      offset=(char) (offset - '0');
      // Remove newline and possible other control characters
      for (start=buf+1 ; my_isspace(des_cs, *start) ; start++) ;
      end=buf+length;
      for  (end=strend(buf) ; 
            end > start && !my_isgraph(des_cs, end[-1]) ; end--) ;

      if (start != end)
      {
	DES_cblock ivec;
	memset(&ivec, 0, sizeof(ivec));
	// We make good 24-byte (168 bit) key from given plaintext key with MD5
	EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL,
		       (uchar *) start, (int) (end-start),1,
		       (uchar *) &keyblock,
		       ivec);
	DES_set_key_unchecked(&keyblock.key1,&(des_keyschedule[(int)offset].ks1));
	DES_set_key_unchecked(&keyblock.key2,&(des_keyschedule[(int)offset].ks2));
	DES_set_key_unchecked(&keyblock.key3,&(des_keyschedule[(int)offset].ks3));
	if (des_default_key == 15)
	  des_default_key= (uint) offset;		// use first as def.
      }
    }
    else if (offset != '#')
      sql_print_error("load_des_file:  Found wrong key_number: %c",offset);
  }
  result=0;

error:
  if (file >= 0)
  {
    mysql_file_close(file, MYF(0));
    end_io_cache(&io);
  }
  mysql_mutex_unlock(&LOCK_des_key_file);
  DBUG_RETURN(result);
}
#endif /* HAVE_OPENSSL */
