Returns one or more keychain items that match a search query, or copies attributes of specific keychain items.
- iOS 2.0+
- macOS 10.6+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
A dictionary that describes the search. A typical
querydictionary consists of:
The item's class. Specify the kind of item you want, for example a password, a certificate, or a cryptographic key, using one of the class values in Item Class Keys and Values.
Attributes. Narrow the search by indicating the attributes that the found item or items should have. The more attributes you specify, the more refined the results, but not all attributes apply to all item classes. See Item Attribute Keys and Values for the complete list of possible attributes.
Search parameters. Condition the search in a variety of ways. For example, you can limit the results to a specific number of items, control case sensitivity when matching string attributes, or search only among a particular set of items. See Search Attribute Keys and Values for the complete list of possible search parameters.
One or more return types. Use the keys found in Item Return Result Keys to indicate whether you seek the item’s attributes, the item’s data, a reference to the data, a persistent reference to the data, or a combination of these. When you specify more than one return type, the search returns a dictionary containing each of the types you request. When your search allows multiple results, they’re all returned together in an array of items.
On return, a reference to the found items. The exact type of the result is based on the values supplied in attributes, as discussed in Item Return Result Keys.
A result code. See Security Framework Result Codes.
By default, this function returns only the first match found. To obtain more than one matching item at a time, specify the search key
k with a value greater than
result will be an object of type
CFArray containing up to that number of matching items.
By default, this function searches for items in the keychain. To instead provide your own set of items to be filtered by this search query, specify the search key
k and provide as its value a
CFArray object containing items of type
Sec. The objects in the provided array must all be of the same type.
To convert from persistent item references to normal item references, specify the search key
k with a value that consists of an object of type
CFArray referencing an array containing one or more elements of type
CFData (the persistent references), and a return-type key of
k whose value is
k. The objects in the provided array must all be of the same type.
When you use Xcode to create an application, Xcode adds an
application-identifier entitlement to the application bundle. Keychain Services uses this entitlement to grant the application access to its own keychain items. You can also add a
Keychain Access Groups Entitlement to the application, specifying an array of keychain access groups to which the application belongs. When you call the
Sec function to add an item to the keychain, you can specify the access group to which that item should belong. By default, the
Sec function searches all the access groups to which the application belongs. However, you can add the
k key to the search dictionary to specify which access group to search for keychain items.