Pyton needs an interpreter, as it is an interpreted language. Any 3.x interpreter can be used (e.g., 3.12). It is recommended to use a so-called virtual environment. This let you have a project specific configuration. Python features a package manager system. Use it to install the Cryptodome` package.
See for example here.
The starter code contains only support functions gathered into Utility/Utility.py.
to_hex_string(the_bytes): generates a printable string out of a list of bytes.
bxor(b1, b2): returns the bit-per-bit XOR of bytes b1 and b2.
screw(text, errors=1): introduces errors random errors (by default 1) into text. The modified text is returned.
screw_file(source, destination=None, errors=1): introduces errors errors into the file source. If the destination file is not specified, the source file is overwritten.
display_size(file_object): returns the size of the file identified by file_object.
to_file(file, block_1, block_2): concatenates the list of bytes block_1 and block_2 into the file file.
from_file(file, block_1_size): returns two lists of bytes: the first has the size block_1_size, and the second has the remaining bytes in the file.
to_file3(file, block_1, block_2, block_3): concatenates the three lists of bytes block_1, block_2 and block_3 in the file file.
from_file3(file, block_1_size, block_2_size): returns three list of bytes. The first contains block_1_size bytes, the second block_2_size bytes, and the third the remaining bytes.