the encrypted data, returned by encryptAESSecretStorageItem.
the encryption key to use as an input to the HKDF function which is used to derive the AES key. Must be the same as provided to encryptAESSecretStorageItem.
the name of the secret. Also used as an input to the HKDF operation which is used to derive the AES key, so again must be the same as provided to encryptAESSecretStorageItem.
Decrypt an AES-encrypted Secret Storage item.