bool RequirementsAreValid(PasswordRequirements requirements, out string reason)
{
reason = "";
//check requirements object is not null
if (requirements is null)
{
reason = "Password requirements are null.";
return(false);
}
//check valid min length
if (requirements.MinLength > requirements.MaxLength)
{
reason = "MinLength cannot be greater than MaxLength.";
return(false);
}
//check other parameters are not exceeding max length
if ((requirements.MinLowerAlphaChars +
requirements.MinNumericChars +
requirements.MinSpecialChars +
requirements.MinUpperAlphaChars)
> requirements.MaxLength)
{
reason = "Combination of MinLowerAlphaChars, MinNumericChars, MinSpecialChars and MinUpperAlphaChars cannot be greater than MaxLength.";
return(false);
}
return(true);
}
public string GeneratePassword(PasswordRequirements requirements)
{
//recieves any validation errors
string error;
if (RequirementsAreValid(requirements, out error))
{
int passwordLength = requirements.MaxLength;
StringBuilder passwordBuilder = new StringBuilder();
//get requested numeric characters
if (requirements.MinNumericChars > 0)
{
passwordBuilder.Append(GetNumericChars(requirements.MinNumericChars));
passwordLength -= requirements.MinNumericChars;
}
//get requested special characters
if (requirements.MinSpecialChars > 0)
{
passwordBuilder.Append(GetSpecialChars(requirements.MinSpecialChars));
passwordLength -= requirements.MinSpecialChars;
}
//get requested alpha characters in uppercase
if (requirements.MinUpperAlphaChars > 0)
{
passwordBuilder.Append(GetUpperChars(requirements.MinUpperAlphaChars));
passwordLength -= requirements.MinUpperAlphaChars;
}
//get requested alpha characters in lowercase
if (requirements.MinLowerAlphaChars > 0)
{
passwordBuilder.Append(GetLowerChars(requirements.MinLowerAlphaChars));
passwordLength -= requirements.MinLowerAlphaChars;
}
//get random remaining characters
if (passwordLength > 0)
{
while (passwordLength > 0)
{
GetCharDelegate[] getCharDelegate = { GetLowerChars, GetUpperChars, GetSpecialChars, GetNumericChars };
passwordBuilder.Append(getCharDelegate[rnd.Next(getCharDelegate.Length)](1));
passwordLength--;
}
}
return(passwordBuilder.ToString().Shuffle());
}
throw new Exception(string.IsNullOrEmpty(error) ? "Something went wrong!!" : error);
}
public string GeneratePassword(PasswordRequirements requirements)
{
if (requirements == null)
{
throw new ArgumentNullException(nameof(requirements));
}
this.requirements = requirements;
GenerateRequiredChars();
GenerateMissingChars();
var password = string.Join("", passwordChars);
return(password);
}
public string GeneratePassword(PasswordRequirements requirements)
{
StringBuilder stringBuilder = new StringBuilder(new String(' ', random.Next(requirements.MinLength, requirements.MaxLength)));
int stringIterator = 0;
// Add lowercase chars
for (int i = 0; i < requirements.MinLowerAlphaChars; i++)
{
stringBuilder[stringIterator] = GenerateCharFromString(lowercaseChars);
stringIterator++;
}
// Add uppercase chars
for (int i = 0; i < requirements.MinUpperAlphaChars; i++)
{
stringBuilder[stringIterator] = GenerateCharFromString(uppercaseChars);
stringIterator++;
}
// Add numeric chars
for (int i = 0; i < requirements.MinNumericChars; i++)
{
stringBuilder[stringIterator] = GenerateCharFromString(numbericChars);
stringIterator++;
}
// Add symbols
for (int i = 0; i < requirements.MinSpecialChars; i++)
{
stringBuilder[stringIterator] = GenerateCharFromString(symbolChars);
stringIterator++;
}
// Fill in missing chars
for (int i = stringIterator; i < stringBuilder.Length; i++)
{
stringBuilder[stringIterator] = GenerateCharFromString(symbolChars + numbericChars + uppercaseChars + lowercaseChars);
stringIterator++;
}
string shuffledString = ShuffleString(stringBuilder.ToString());
return(shuffledString);
}