The key material to import, wrapped by the vault's RSA public wrapping key and base64-encoded.
The wrapping mechanism to use during key import. {@code RSA_OAEP_AES_SHA256} invokes the RSA AES key wrap mechanism, which generates a temporary AES key. The temporary AES key is wrapped by the vault's RSA public wrapping key, creating a wrapped temporary AES key. The temporary AES key is also used to wrap the private key material. The wrapped temporary AES key and the wrapped exportable key material are concatenated, producing concatenated blob output that jointly represents them. {@code RSA_OAEP_SHA256} means that the exportable key material is wrapped by the vault's RSA public wrapping key.
The details of the wrapped import Key.