public override string Generate()
{
if (!IsUpperCaseLetters && !IsLowerCaseLetters && !IsNumbers && !IsSpecialCharacters)
{
throw new InvalidOperationException("Impossible to generate a password!");
}
PasswordStrength = CalculatePasswordStrength();
var characters = new List <char>();
var builder = new StringBuilder();
var random = new Random();
var upperCaseLetters = Enumerable.Range((byte)'A', (byte)'Z' - (byte)'A').Select(x => (char)x).ToList();
var lowerCaseLetters = Enumerable.Range((byte)'a', (byte)'z' - (byte)'a').Select(x => (char)x).ToList();
var numbers = Enumerable.Range((byte)'0', (byte)'9' - (byte)'0').Select(x => (char)x).ToList();
var specialCharacters = SpecialCharacters.ToCharArray();
if (IsUpperCaseLetters)
{
characters.AddRange(upperCaseLetters);
}
if (IsLowerCaseLetters)
{
characters.AddRange(lowerCaseLetters);
}
if (IsNumbers)
{
characters.AddRange(numbers);
}
if (IsSpecialCharacters)
{
characters.AddRange(specialCharacters);
}
if (!characters.Any())
{
return(string.Empty);
}
for (var i = 0; i < PasswordLength; i++)
{
if (characters.Count == 0)
{
throw new InvalidOperationException("Impossible to generate a password!");
}
var nextIndex = (random.Next(1, characters.Count) * 13) % characters.Count;
var nextChar = characters[nextIndex];
builder.Append(nextChar);
if (IsExcludeSimilarCharacters)
{
characters.RemoveAt(nextIndex);
}
}
var tempPassword = builder.ToString();
if (IsUpperCaseLetters)
{
tempPassword = UpdatePassword(tempPassword, upperCaseLetters);
}
if (IsLowerCaseLetters)
{
tempPassword = UpdatePassword(tempPassword, lowerCaseLetters);
}
if (IsNumbers)
{
tempPassword = UpdatePassword(tempPassword, numbers);
}
if (IsSpecialCharacters)
{
tempPassword = UpdatePassword(tempPassword, specialCharacters);
}
return(tempPassword);
}
public string RandomPassword(int length)
{
const string CapitalLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string SmallLetters = "abcdefghijklmnopqrstuvwxyz";
const string Digits = "0123456789";
const string SpecialCharacters = @"~!@#$%^&*():;[]{}<>,.?/\|";
// Make a list of allowed characters.
string allowed = "";
if (cbNumbers.Checked)
{
allowed = Digits;
}
if (cbSpecialChar.Checked)
{
allowed = SpecialCharacters;
}
if (cbUpperCasing.Checked)
{
allowed = CapitalLetters;
}
if (cbLowerCasing.Checked)
{
allowed = SmallLetters;
}
// Satisfy requirements.
string password = "";
if (cbNumbers.Checked &&
(password.IndexOfAny(Digits.ToCharArray()) == -1))
{
password += RandomChar(Digits);
}
if (cbSpecialChar.Checked &&
(password.IndexOfAny(SpecialCharacters.ToCharArray()) == -1))
{
password += RandomChar(SpecialCharacters);
}
if (cbUpperCasing.Checked &&
(password.IndexOfAny(CapitalLetters.ToCharArray()) == -1))
{
password += RandomChar(CapitalLetters);
}
if (cbLowerCasing.Checked &&
(password.IndexOfAny(SmallLetters.ToCharArray()) == -1))
{
password += RandomChar(SmallLetters);
}
// Add the remaining characters randomly.
while (password.Length < Convert.ToInt32(numericPassLenght.Value))
{
password += RandomChar(allowed);
}
// Randomize (to mix up the required characters at the front).
password = RandomizeString(password);
return(password);
}
