===== General =====

  - Set the 3DO header[0] values as necessary of the AIF executable.
      - Set the signature location.
      - Do **NOT**  set the signature size. Keep it / set it to zero (0x00000000).
  - Calculate the MD5 digest of the whole file.
  - Create the `message` to sign.
      - Append the MD5 digest to the following data (presented in hex)
      - 1ffffffffffffffffffffffffffffffffffffffffffffffffffffff003020300c06082a864886f70d020505000410
  - Use the "3DO" private key[1] to sign the message.
  - Append the signature to the end of the AIF executable.
  - Set the signature size to it's length (0x40).

[0] [[documentation:file_formats:sdk:3do_aif_header]] \\
[1] [[documentation:encryption:opera:encryption_keys]]

===== modbin + openssl =====