Doubtful.

https://www.foia.gov/faq.html

> Exemption 7: Information compiled for law enforcement purposes that: (A) Could reasonably be expected to interfere with enforcement proceedings

I'd fully expect other exemptions to apply if you FOIAed the White House's SSL private key or something.

I’m Canada, usually you have to give everything to the FOIA department, and then they redact it.

I think that would make the keyholders soil themselves if they had to send the keys over even for a second like that.

FOIA is a federal law. Each state has its own law. For example, Texas's is the Texas Public Information Act (TPIA). The standards could vary state by state.

All of them have pretty broad law enforcement exemptions.

Even if you could, how long do you think your FOIA request would take to get processed vs. the rekeying frequency of the encryption?

key management is hard