Manu Manu - 1 year ago 89
iOS Question

Reset An iPhone App's Keychain

I would like to know if there is a way to reset My app's keychain. I am wondering whether anything exist like

[NSUserDefaults resetStandardUserDefaults]


for keychain. Key chain is not reset even after the app is deleted. So far the only way I know is to reset them one by one from the app.

Answer Source

As all of the answers so far relies on that you know the identifiers you want to delete I would like to submit the following solution that deletes ALL existing keys for the app (iOS only)

-(void)resetKeychain {
    [self deleteAllKeysForSecClass:kSecClassGenericPassword];
    [self deleteAllKeysForSecClass:kSecClassInternetPassword];
    [self deleteAllKeysForSecClass:kSecClassCertificate];
    [self deleteAllKeysForSecClass:kSecClassKey];
    [self deleteAllKeysForSecClass:kSecClassIdentity];
}

-(void)deleteAllKeysForSecClass:(CFTypeRef)secClass {
    NSMutableDictionary* dict = [NSMutableDictionary dictionary];
    [dict setObject:(__bridge id)secClass forKey:(__bridge id)kSecClass];
    OSStatus result = SecItemDelete((__bridge CFDictionaryRef) dict);
    NSAssert(result == noErr || result == errSecItemNotFound, @"Error deleting keychain data (%ld)", result);
}

Swift 2.2 version:

func resetKeychain() {
    self.deleteAllKeysForSecClass(kSecClassGenericPassword)
    self.deleteAllKeysForSecClass(kSecClassInternetPassword)
    self.deleteAllKeysForSecClass(kSecClassCertificate)
    self.deleteAllKeysForSecClass(kSecClassKey)
    self.deleteAllKeysForSecClass(kSecClassIdentity)
}

func deleteAllKeysForSecClass(secClass: CFTypeRef) {
    let dict: [NSString : AnyObject] = [kSecClass : secClass]
    let result = SecItemDelete(dict)
    assert(result == noErr || result == errSecItemNotFound, "Error deleting keychain data (\(result))")
}