/// <summary>
/// Gets the UTC from unix time.
/// </summary>
/// <param name="data">The data.</param>
/// <returns>The date and time as UTC</returns>
private static DateTime GetUtcFromUnixTime(
byte[] data)
{
if (data.Length != 4)
{
throw new InvalidDataException("Unix time must be a 32-bit integer");
}
var unixTime = BitConverter.ToInt32(data, 0);
var netTime = PasswordSafeUtility.GetUtcFromUnixTime(unixTime);
return(netTime);
}
/// <summary>
/// Parses a password history from the database serialized format which is:
/// smmnnddddddddllll[passsword] ...
/// 's' is a decimal status.
/// 'mm' is a hex max number of password history entries
/// 'nn' is a hex number of passwords in this list
/// The following is repeated 'nn' times:
/// 'dddddddd' is a hex representation of 32-bit unix time when this password was changed.
/// 'llll' is a hex representation of 16-bit length of the password that follows.
/// [password] is the string of the password.
/// </summary>
/// <param name="serialized">The serialized string</param>
/// <returns>The decoded password history</returns>
public static PasswordSafePasswordHistory Parse(
string serialized)
{
if (serialized == null)
{
throw new ArgumentNullException("serialized");
}
var history = new PasswordSafePasswordHistory();
if (serialized.Length < 5)
{
return(history);
}
history.Status = byte.Parse(serialized.Substring(0, 1), NumberStyles.Integer, CultureInfo.InvariantCulture);
history.MaxHistory = byte.Parse(serialized.Substring(1, 2), NumberStyles.HexNumber,
CultureInfo.InvariantCulture);
var numberOfPasswords = int.Parse(serialized.Substring(3, 2), NumberStyles.HexNumber,
CultureInfo.InvariantCulture);
var currentIndex = 5;
for (var i = 0; i < numberOfPasswords; ++i)
{
var unixTimeChanged = int.Parse(serialized.Substring(currentIndex, 8), NumberStyles.HexNumber,
CultureInfo.InvariantCulture);
var passwordChangedUtc = PasswordSafeUtility.GetUtcFromUnixTime(unixTimeChanged);
currentIndex += 8;
var passwordLength = int.Parse(serialized.Substring(currentIndex, 4), NumberStyles.HexNumber,
CultureInfo.InvariantCulture);
currentIndex += 4;
var password = serialized.Substring(currentIndex, passwordLength);
currentIndex += passwordLength;
history.PasswordHistoryAdd(new PasswordSafePassword(password, passwordChangedUtc));
}
return(history);
}
