OpenSSL::PKey::RSA#translate_padding_mode

# File tmp/rubies/ruby-3.1.3/ext/openssl/lib/openssl/pkey.rb, line 452
        def translate_padding_mode(num)
  case num
  when PKCS1_PADDING
    "pkcs1"
  when SSLV23_PADDING
    "sslv23"
  when NO_PADDING
    "none"
  when PKCS1_OAEP_PADDING
    "oaep"
  else
    raise OpenSSL::PKey::PKeyError, "unsupported padding mode"
  end
end