Intermediary menu, title is self explanatory.

Menu for DH key exchange.

Generates Private and Public keys.

Brings up a menu that will let the user choose their secret.

utility submenu for geting a string.

Utility function to get an integer.

Utility function to get a prime number.

Utility function to get a primitive of a prime.

Main menu - the entry point.

Would they like to generate keys? If no, would they like to encrypt or decrypt?.