Helper classes

genNewPw.cs

public void GenerateNewPassword(PasswordOptions opts = null)
{
    #region Generating New Password
    if (opts == null) opts = new PasswordOptions()
    {
        RequiredLength = 12,
        RequiredUniqueChars = 4,
        RequireDigit = true,
        RequireLowercase = true,
        RequireNonAlphanumeric = true,
        RequireUppercase = true
    };

    string[] randomChars = new[] {
            "ABCDEFGHJKLMNOPQRSTUVWXYZ",    // uppercase 
            "abcdefghijkmnopqrstuvwxyz",    // lowercase
            "0123456789",                   // digits
            "!@$?_-"                        // non-alphanumeric
        };

    random = new Random(Environment.TickCount);
    List<char> chars = new List<char>();

    if (opts.RequireUppercase)
        chars.Insert(random.Next(0, chars.Count),
            randomChars[0][random.Next(0, randomChars[0].Length)]);

    if (opts.RequireLowercase)
        chars.Insert(random.Next(0, chars.Count),
            randomChars[1][random.Next(0, randomChars[1].Length)]);

    if (opts.RequireDigit)
        chars.Insert(random.Next(0, chars.Count),
            randomChars[2][random.Next(0, randomChars[2].Length)]);

    if (opts.RequireNonAlphanumeric)
        chars.Insert(random.Next(0, chars.Count),
            randomChars[3][random.Next(0, randomChars[3].Length)]);

    for (int i = chars.Count; i < opts.RequiredLength
        || chars.Distinct().Count() < opts.RequiredUniqueChars; i++)
    {
        string rcs = randomChars[random.Next(0, randomChars.Length)];
        chars.Insert(random.Next(0, chars.Count),
            rcs[random.Next(0, rcs.Length)]);
    }
    #endregion

    nh_api_password = new string(chars.ToArray());
    
}

genNewSecret.cs

private void GenerateNewSecret(int lenght = 65)
{
    const string chars = "abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

    nh_api_secret = new string(Enumerable.Repeat(chars, lenght)
      .Select(s => s[random.Next(s.Length)]).ToArray());
}

genNewSHA512.cs

public void GenerateSHA512Hash(string password)
{
    HashAlgorithm alg = new SHA512Managed();

    var HashedBytes = Encoding.UTF8.GetBytes(password);
    
    nh_api_SHA_hash = Convert.ToBase64String(alg.ComputeHash(HashedBytes));
}