Mastering Assembly Programming

Core procedures

Having taken care of all the output format specifics, we may safely proceed to the implementation of the core's code. As it has already been mentioned earlier, we are about to export only a single entry; however, we still need to implement the rest. There are only four procedures in our core:

• f_set_data_pointer: This procedure accepts a single parameter, which is a pointer to the data we want to process, and stores it to the data_pointer global variable
• f_set_data_length: This procedure accepts one parameter, which is the length of data we want to encrypt/decrypt, and stores it to the data_length global variable
• f_encrypt: This procedure implements the encryption loop
• f_decrypt: This is the inverse operation of f_encrypt ...