using System.Security.Cryptography;

Console.WriteLine($"FIPS Enabled: {File.ReadAllText("/proc/sys/crypto/fips_enabled").Trim()}");

Span<byte> data = stackalloc byte[64];
Span<byte> output = stackalloc byte[64];

for (int keyLength = 0; keyLength <= 20; keyLength++)
{
    byte[] key = new byte[keyLength];
    try
    {
        bool success = HMACSHA512.TryHashData(key, data, output, out int bytesWritten);
        Console.WriteLine($"Key length {keyLength,2} bytes: Success");
    }
    catch (CryptographicException ex1)
    {
        // Try the instance-based approach as fallback
        try
        {
            using var hmac = new HMACSHA512(key);
            hmac.ComputeHash(data.ToArray());
            Console.WriteLine($"Key length {keyLength,2} bytes: Static failed, Instance works - \"{ex1.Message}\"");
        }
        catch (Exception ex2)
        {
            Console.WriteLine($"Key length {keyLength,2} bytes: Both failed - Static: \"{ex1.Message}\", Instance: \"{ex2.Message}\"");
        }
    }
}