fun importAttachment(jar: InputStream): SecureHashInserts the given attachment into the store, does
Note that you should not pass a JarInputStream into this method and it will throw if you do, because access to the raw byte stream is required.
FileAlreadyExistsException - if the given byte stream has already been inserted.IllegalArgumentException - if the given byte stream is empty or a JarInputStreamIOException - if something went wrong.