Credential file is a file that holds important information about users, including their usernames and hashed passwords. The purpose of this program is to add a new user to the credential file. Since only the user admin has the proper permissions to manage users (e.g., adding a new user), the program will first retrieve all username and passwords from credential file, stores them in an array of struct user, iterates through the array to find the password (in the hashed form) for user “admin”, and then asks the user to enter the admin’s password. Only when the passwords match, the user is asked to provide the information regarding the new user. The program then adds the user to the array of struct user, and then writes the updated list of users to credential file.
Consider the struct user used in the previous lab. In this lab, we will improve the security of our program by storing usernames and passwords in credential file. credential file has the following format (separated by ‘t’):
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