The first version of the Bible online that I found was the KJV. It seems pretty clear that the commands are attributed to God.
Yes, this is a slippery subject. The decalogue was written on the tablets by God and so that is the "written Torah" according to Jewish commentaries. But, the other commands and statutes that are given in the Torah were given by God to Moses, who then wrote them down. That is referred to as the oral Torah.
If I'm not mistaken, these are the Jewish interpretations of the Torah. The other commands had to come from someplace, in the first consideration. Second, their writing down was attributed to Moses. So where did Moses get these? On Sinai where he was for 40 days.
According to the New Jerome Biblical Commentary, there are few official interpretations of scripture by the Catholic Church. So, you may run into a variety of opinions about the subject.
In a vague way, I'm going to mention that Jesus referred to the Torah as having been written by Moses, with an implied divine source of inspiration.
So, that's the best understanding that I have at the moment. I don't have a horse in your race, so I don't know what confirmation you are searching for.
In Lev is the incident where the man is picking up sticks on the Sabbath and caught doing so. If I recall correctly, they go to Moses to apply the law and punishment, in the form of a question. Moses goes to seek God's counsel about the punishment. Here, this seems to imply to me divine authorship, inasmuch as even Moses doesn't exactly kinow how to apply the law.