vm_compute. reflexivity. Qed.

Lemma RFC4231_Section4_4_hex: (*called PRF-3 in RFC4868*)
checkHex "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
"773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe".