/// <summary>
/// Import RSA public key
/// </summary>
/// <param name="rsa"></param>
/// <param name="publicKey"></param>
/// <param name="bytesRead"></param>
/// <exception cref="ArgumentNullException"></exception>
public static void ImportRSAPublicKey(this RSA rsa, ReadOnlySpan <byte> publicKey, out int bytesRead)
{
if (rsa is null)
{
throw new ArgumentNullException(nameof(rsa));
}
bytesRead = publicKey.Length;
var key = Convert.ToBase64String(publicKey.ToArray());
rsa.FromPkcs1PublicString(key, out _);
}