Alternative to System.Web.Security.Membership.GeneratePassword in aspnetcore (netcoreapp1.0)

Here's a class/method, based on the source of Membership.GeneratePassword of that works on .NET Core:

public static class Password{    private static readonly char[] Punctuations = "!@#$%^&*()_-+=[{]};:>|./?".ToCharArray();    public static string Generate(int length, int numberOfNonAlphanumericCharacters)    {        if (length < 1 || length > 128)        {            throw new ArgumentException(nameof(length));        }        if (numberOfNonAlphanumericCharacters > length || numberOfNonAlphanumericCharacters < 0)        {            throw new ArgumentException(nameof(numberOfNonAlphanumericCharacters));        }        using (var rng = RandomNumberGenerator.Create())        {            var byteBuffer = new byte[length];            rng.GetBytes(byteBuffer);            var count = 0;            var characterBuffer = new char[length];            for (var iter = 0; iter < length; iter++)            {                var i = byteBuffer[iter] % 87;                if (i < 10)                {                    characterBuffer[iter] = (char)('0' + i);                }                else if (i < 36)                {                    characterBuffer[iter] = (char)('A' + i - 10);                }                else if (i < 62)                {                    characterBuffer[iter] = (char)('a' + i - 36);                }                else                {                    characterBuffer[iter] = Punctuations[i - 62];                    count++;                }            }            if (count >= numberOfNonAlphanumericCharacters)            {                return new string(characterBuffer);            }            int j;            var rand = new Random();            for (j = 0; j < numberOfNonAlphanumericCharacters - count; j++)            {                int k;                do                {                    k = rand.Next(0, length);                }                while (!char.IsLetterOrDigit(characterBuffer[k]));                characterBuffer[k] = Punctuations[rand.Next(0, Punctuations.Length)];            }            return new string(characterBuffer);        }    }}

I've omitted the do...while loop over the CrossSiteScriptingValidation.IsDangerousString. You can add that back in yourself if you need it.

You use it like this:

var password = Password.Generate(32, 12);

Also, make sure you reference System.Security.Cryptography.Algorithms.