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Secure password generator generator#

Public static string RandomString(int length) public static Random random = new Random() Note the Random is a global static variable.

Take random characters from the concatenated array for the required length.

Random numerical characters for the required length divided by 2.

Random uppercase characters for the required length divided by 3.

Random lowercase characters for the required length divided by 3.

Random special characters for the required length divided by 4.

The following is pretty quick and works well.

Secure password generator generator#

Return new Random(seed).Next(minimumValue, maximumValue) Ĭonsume in your code thusly: var generator = new PasswordGenerator()

Generate uniformly distributed random integers within a given range. Public int Next(int minimumValue, int maximumValue) Do not use Next() % maximumValue because the distribution is not OK Var result = BitConverter.ToInt32(randomBuffer, 0) Private readonly RNGCryptoServiceProvider _rngProvider = new RNGCryptoServiceProvider() and high entropy or I will hunt you down with a pitchfork!! Only RNGCryptoServiceProvider() is safe. Never ever ever never use Random() in the generation of anything that requires true security/randomness Var shuffeldChars = source.ShuffleSecure().ToArray() Public static string ShuffleTextSecure(this string source) Int randomIndex = (counter, sourceArray.Length) Public static IEnumerable ShuffleSecure(this IEnumerable source)įor (int counter = 0 counter < sourceArray.Length counter++) New Lazy(() => new RandomSecureVersion()) Private string GetRandomString(string possibleChars, int lenght)įor (var position = 0 position RandomSecure = Var result = unshuffeledResult.ShuffleTextSecure() Shuffle the result so the order of the characters are unpredictable Var unshuffeledResult = minimumChars + rest Var rest = GetRandomString(_allAvailableChars, lengthOfPassword - minimumChars.Length) GetRandomString(AllSpecialChars, MinimumSpecialChars) GetRandomString(AllNumericChars, MinimumNumericChars) + GetRandomString(AllUpperCaseChars, MinimumUpperCaseChars) + Var minimumChars = GetRandomString(AllLowerCaseChars, MinimumLowerCaseChars) + add random charactes of all catagories Get the required number of characters of each catagory and Var lengthOfPassword = _randomSecure.Next(MinimumLengthPassword, MaximumLengthPassword) If (minimumLowerCaseChars 0 || _minimumNumberOfChars = 0 ? allChars : string.Empty Throw new ArgumentException("The minimumLength is bigger than the maximum length.", If (minimumLengthPassword maximumLengthPassword) Define characters that are valid and reject ambiguous characters such as ilo, IO and 1 or 0ĪllLowerCaseChars = GetCharRange('a', 'z', exclusiveChars: "ilo") ĪllUpperCaseChars = GetCharRange('A', 'Z', exclusiveChars: "IO") ĪllNumericChars = GetCharRange('2', '9') Private readonly RandomSecureVersion _randomSecure = new RandomSecureVersion() Private readonly string _allAvailableChars Not sure where I found this but here's a class to generate high entropy, truly random strings that can be used as passwords.