How to get to Cryptographic Assets using CryptoTokenKit framework?

I am trying to use cryptographic assets via CryptoTokenKit framework.

It's said in the documentation

When the framework copies an item from a token to the keychain, it records the associated token’s identifier, or token ID, as part of the keychain item.

I use the following query without even importing CryptoTokenKit:

let query: [String: Any] = [kSecClass as String: kSecClassIdentity,
                                    kSecAttrKeyType as String: kSecAttrKeyTypeRSA,
                                    kSecMatchLimit as String: kSecMatchLimitAll,
                                    kSecReturnAttributes as String: kCFBooleanTrue,
                                    kSecReturnData as String: kCFBooleanTrue,
                                    kSecReturnRef as String: true]

var identity: AnyObject?
checkStatus(status: SecItemCopyMatching(query as CFDictionary, &identity))

And I am able to retrieve Identity, which is located on USB Token. However, I am facing problem with exporting of private key from USB Token.

CTK framework should copy items from Token to Keychain. What shall be done, to achieve this?