#Random password generator microsoft code

Private static string GetRandomString( string possibleChars, int len)ДЇor ( var position = 0 position < len position++) Public static string GetCharRange( char begin, char end, string excludingChars = ' ') Public static string RandomSymbol( int length) => GetRandomString(_SYMBOL, length) Public static string RandomNumerical( int length) => GetRandomString(_NUMERICAL, length) Public static string RandomLowerCase( int length) => GetRandomString(_LOWERCASEALPHABETICAL, length) Public static string _LOWERCASEALPHABETICAL = GetCharRange( ' a', ' z', ' li') // 'abcdefghjkmnopqrstuvwxyz' public static string _UPPERCASEALPHABETICAL = GetCharRange( ' A', ' Z') // 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' public static string _NUMERICAL = GetCharRange( ' 0', ' 9') // '0123456789' public static string _SYMBOL = ' static string RandomUpperCase( int length) => GetRandomString(_UPPERCASEALPHABETICAL, length)

#Random password generator microsoft code

The method GetRandomString(string, int) below is to achieve what we were talking about:Д¬opy Code public static class PasswordService Now, we can generate random password by getting the characters from the set of acceptable characters using the generated random numbers (from RandomService class) as the random indexes. If (min > max) throw new ArgumentException($ ' Second input ( public static int Next( int max) => Next( 0, max) Generate an int within range if max > min, and min if min = max public static int Next( int min, int max) _rngProvider.GetBytes(buffer) // Fill the buffer uint random = BitConverter.ToUInt32(buffer, 0) Generate a random real number within range public static double Next() Return BitConverter.ToInt32(randomBuffer, 0) Public static readonly RNGCryptoServiceProvider _rngProvider = new RNGCryptoServiceProvider() The Code Determine the set of acceptable charactersДЇirst, we need the set of all possible characters for each type of the 4 types above.Д¬opy Code public static class RandomService The job can be divided into two classes: RandomService (step 1 - 4) and PasswordService (step 5 - 6). Generate a string of random t symbol characters.Generate a string of random z numeric characters.Generate a string of random y upper-case characters.Generate a string of random x lower-case characters.It contains x lower-case, y upper case, z numeric, and t symbol characters (where x + y + z + t = n). Password is usually required to be n characters length.The 'l' character is sometimes confused with the number 1.NotesДЄ password might contain 4 types of characters:

This article is to share my experience working with a project that requires cryptographically secure, and RNGCryptoServiceProvider is my choice. For comparison between the two options, pros and cons, and their usages, you can google them. Instead, RNGCryptoServiceProvider which (based on the documentation) implements a cryptographic Random Number Generator (RNG), is a recommended choice. When it comes to generating random numbers that requires higher randomness (less predictable/guessable/biased distribution), the popular System.Random is not a good option.