/// <summary>
/// To be override in Encripted disk
/// </summary>
protected virtual void ValidatePassword(byte[] passwordHash)
{
if (passwordHash.Any(b => b > 0))
{
throw LiteException.DatabaseWrongPassword();
}
}
protected override void ValidatePassword(byte[] passwordHash)
{
if (passwordHash.BinaryCompareTo(_password) != 0)
{
throw LiteException.DatabaseWrongPassword();
}
}
/// <summary>
/// Initialize LiteEngine using custom disk service implementation and full engine options
/// </summary>
public LiteEngine(IDiskService disk, string password = null, TimeSpan?timeout = null, int cacheSize = 5000, Logger log = null, bool utcDate = false)
{
if (disk == null)
{
throw new ArgumentNullException("disk");
}
_timeout = timeout ?? TimeSpan.FromMinutes(1);
_cacheSize = cacheSize;
_disk = disk;
_log = log ?? new Logger();
_bsonReader = new BsonReader(utcDate);
try
{
// initialize datafile (create) and set log instance
_disk.Initialize(_log, password);
// lock disk (read mode) before read header
var position = _disk.Lock(LockState.Read, _timeout);
var buffer = _disk.ReadPage(0);
_disk.Unlock(LockState.Read, position);
// create header instance from array bytes
var header = BasePage.ReadPage(buffer) as HeaderPage;
// hash password with sha1 or keep as empty byte[20]
var sha1 = password == null ? new byte[20] : AesEncryption.HashSHA1(password);
// compare header password with user password even if not passed password (datafile can have password)
if (sha1.BinaryCompareTo(header.Password) != 0)
{
throw LiteException.DatabaseWrongPassword();
}
// initialize AES encryptor
if (password != null)
{
_crypto = new AesEncryption(password, header.Salt);
}
// initialize all services
this.InitializeServices();
// if header are marked with recovery, do it now
if (header.Recovery)
{
_trans.Recovery();
}
}
catch (Exception)
{
// explicit dispose
this.Dispose();
throw;
}
}
/// <summary>
/// Initialize LiteEngine using custom disk service implementation and full engine options
/// </summary>
public LiteEngine(IDiskService disk, string password = null, TimeSpan?timeout = null, int cacheSize = 5000, Logger log = null)
{
if (disk == null)
{
throw new ArgumentNullException("disk");
}
_timeout = timeout ?? TimeSpan.FromMinutes(1);
_cacheSize = cacheSize;
_disk = disk;
_log = log ?? new Logger();
try
{
// initialize datafile (create) and set log instance
_disk.Initialize(_log, password);
// read header page
var header = BasePage.ReadPage(_disk.ReadPage(0)) as HeaderPage;
// hash password with sha1 or keep as empty byte[20]
var sha1 = password == null ? new byte[20] : AesEncryption.HashSHA1(password);
// compare header password with user password even if not passed password (datafile can have password)
if (sha1.BinaryCompareTo(header.Password) != 0)
{
throw LiteException.DatabaseWrongPassword();
}
// initialize AES encryptor
if (password != null)
{
_crypto = new AesEncryption(password, header.Salt);
}
// initialize all services
this.InitializeServices();
// try recovery if has journal file
_trans.Recovery();
}
catch (Exception)
{
// explicit dispose
this.Dispose();
throw;
}
}
/// <summary>
/// Override read page decrypting data from disk
/// </summary>
public override byte[] ReadPage(uint pageID)
{
var buffer = base.ReadPage(pageID);
// when read header, checks passoword
if (pageID == 0)
{
// I know, header page will be double read (it's the price for isolated concerns)
var header = (HeaderPage)BasePage.ReadPage(buffer);
if (header.DbParams.Password.BinaryCompareTo(_password) != 0)
{
throw LiteException.DatabaseWrongPassword();
}
return(buffer);
}
return(_crypto.Decrypt(buffer));
}
