public String GeneratePassword(CombinedKeyOptions options)
{
if ((options.PassphraseGenerationOptions == null || options.PassphraseGenerationOptions.WordCount == 0) &&
(options.PasswordGenerationOptions == null || options.PasswordGenerationOptions.Length == 0))
{
throw new Exception("Bad options");
}
string key = "";
Random random = new SecureRandom();
var passwordOptions = options.PasswordGenerationOptions;
var passphraseOptions = options.PassphraseGenerationOptions;
if (passphraseOptions != null && passphraseOptions.WordCount > 0)
{
var wl = new Wordlist();
string passphrase = "";
for (int i = 0; i < passphraseOptions.WordCount; i++)
{
string word = wl.GetWord(random);
if (passphraseOptions.CaseMode == PassphraseGenerationOptions.PassphraseCaseMode.Uppercase)
{
word = word.ToUpper();
}
else if (passphraseOptions.CaseMode == PassphraseGenerationOptions.PassphraseCaseMode.Lowercase)
{
word = word.ToLower();
}
else if (passphraseOptions.CaseMode == PassphraseGenerationOptions.PassphraseCaseMode.PascalCase)
{
word = word.ToUpperFirstLetter();
}
passphrase += word;
if (i < passphraseOptions.WordCount - 1 || passwordOptions != null)
{
passphrase += passphraseOptions.Separator;
}
}
key += passphrase;
}
if (passwordOptions != null)
{
var groups = GetCharacterGroups(passwordOptions);
String characterSet = GetCharacterSet(passwordOptions, groups);
if (characterSet.Length == 0)
{
throw new Exception("Bad options");
}
int size = characterSet.Length;
StringBuilder buffer = new StringBuilder();
if (passwordOptions.AtLeastOneFromEachGroup)
{
foreach (var g in groups)
{
if (g.Length > 0)
{
buffer.Append(g[random.Next(g.Length)]);
}
}
}
if (size > 0)
{
while (buffer.Length < passwordOptions.Length)
{
buffer.Append(characterSet[random.Next(size)]);
}
}
var password = buffer.ToString();
if (passwordOptions.AtLeastOneFromEachGroup)
{
//shuffle
StringBuilder sb = new StringBuilder(password);
for (int i = (password.Length - 1); i >= 1; i--)
{
int j = random.Next(i + 1);
var tmp = sb[i];
sb[i] = sb[j];
sb[j] = tmp;
}
password = sb.ToString();
}
key += password;
}
return(key);
}