October 2013
Intermediate to advanced
1053 pages
28h 7m
English
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8.6. Sharing Keychain Data Between Multiple Apps
Problem
You want two of your apps to be able to share keychain storage.
Solution
When storing your keychain data, specify the kSecAttrAccessGroup key in the dictionary that
gets passed to the SecItemAdd
function. The value of this key has to be the access group, which you
can find in the Entitlements section of your provision profile, as
explained in this chapter’s Introduction.
Discussion
Multiple apps from the same developer portal can share a keychain area. To avoid complications, we are going to limit our thoughts to only two apps for now, but this same technique applies for any number of apps.
In order for two apps to be able to share a keychain area, the following criteria must be met:
Both apps must have been signed using a provision profile originated from the same iOS Developer Portal.
Both apps have to have the same Group ID in their provision profile. This is usually the Team ID as selected by Apple. I suggest that you don’t change this group ID when you create your own provision profiles.
The first app that stores the value in the keychain must specify the
kSecAttrAccessGroupattribute for the keychain item that is getting stored. This access group must be the same access group that is mentioned in your provision profile. Have a look at this chapter’s Introduction to learn how to extract this value from your provision profiles.The value stored in the keychain should have been stored with the
kSecAttrServiceattribute set to a value ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.