Simple password-like string generator.

EzPasswords.cs

// Copyright 2020 Emzi0767
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Requires NuGet package: Emzi0767.Common

using System;
using Emzi0767;

namespace ScratchPad
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            var alphabet = @"abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()-_=+,<.>/?\|'"";:[{]}€`~".AsSpan();

            while (true)
            {
                int klen;
                using (var rng = new SecureRandom())
                    klen = rng.Next(96, 128);

                Span<byte> buff = stackalloc byte[klen];
                Span<char> chrs = stackalloc char[klen];
                using (var rng = new SecureRandom())
                    rng.GetBytes(buff);

                for (var i = buff.Length - 1; i >= 0; --i)
                    chrs[i] = alphabet[buff[i] % alphabet.Length];

                var key = new string(chrs);
                Console.WriteLine("Generated key:");
                Console.WriteLine(key);

                if (Console.ReadKey(true).KeyChar == 'q')
                    break;
            }
        }
    }
}