将校验和附加到整数的函数

Question

I have a function gen_seq that return a random generated integer of length n

e.g.

gen_seq(5); // return a randomly generated int of length n, e.g. 12345

Now, I want a simple function that in append the checksum the end of function

get_seq_with_checksum(5); // return 12345[28]
is_valid_seq(n); // check if a given string is valid according to the input function

1. What would be a good fit algorithm pairs for function get_seq_with_checksum & is_valid_seq?

Answer 1

A simple parity word should do pretty much what you're after – XOR each byte of the message together to create the checksum, and verify similarly.