How to secure a Mac Application with a password?

Question

i am currently trying to secure my Objective-c application with a password. What I want is a window(or similiar..) popping up whenever the application is launched. Only if the password is right shall the user be able to use the program. How to encrypt the string properly? I don't want any user to be able to extract it from the content files. Even though the user should be able to change it once he "logged in".

Thanks in advance. I am asking for a hint only :)

Answer 1

每当您要存储敏感信息（例如密码）时，请使用Keychain Services 。

Answer 2

You can create an md5-hash of the password and store that in a file. If someone else opens this file and sees the hash, it almost impossible to reformat it back to the original password. Now when the user enters a password in your application, make an other md5 hash from that one, and compare if that hash is the same as you stored in the file.

man 3 md5 for creating md5 hashes on Mac with C code. I don't know any Objective-C wrapper for that, but it should be easy to create it yourself.

Hope it helps, ief2

EDIT: Keychain Services is indeed the more "standard" solution