Storing keys in KeyChain with KeyChainItemWrapper

Question

I'm using KeyChainItemWrapper class, provided by Apple's Sample Code to save the authentication token to the keychain.

KeychainItemWrapper *keychain = [[KeychainItemWrapper alloc] initWithIdentifier"JetTaxiApp_AuthToken" accessGroup:nil];  

But when I'm trying to set the value to keychain, an odd exception is raised

[_authenticationTokenKeychain setObject:authenticationToken forKey: @"auth_token"];

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't add the Keychain Item.'

The keychain doesn't exist yet (at the moment of this call) What can cause this exception?

Soakage

Make sure you added the keychain access plist file. Take a look at #5860115 – Lintwhite

Answer 1

You need to use standard keys, so here your @"auth_token" is incorrect.

The keys that can be used for this purpose and the possible values for each key are listed in the “Keychain Services Constants” section.

source, with list of valid constants: Keychain Services Reference

For instance, you can use:

[_authenticationTokenKeychain setObject:authenticationToken forKey: (__bridge NSString *)kSecValueData];

Greenfinch

When using the ARC version of keychainItemWrapper, you need to do it the following way : [_authenticationTokenKeychain setValue:authenticationToken forKey:(__bridge NSString*)kSecValueData]; – Zales

@DamienMATHIEU I'm using the ARC version but I'm still having issues. I get this error: '[<KeychainItemWrapper 0x89c5900> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key v_Data.' Any ideas what could be wrong? – Yokoyokohama

@Yokoyokohama instead of using setValue, use setObject – Anatolian

Answer 2

[_authenticationTokenKeychain setObject:authenticationToken forKey: @"auth_token"];  

For code snippet above, key param is only can use the keys provided from sdk. You can find all in SecItem.h

Garmaise