[NTG-context] hash for buffer contents

Dear list, I have the following sample: \ctxlua{require("util-sha")} \starttext \startbuffer[abc] samples \stopbuffer \cldcontext{utilities.sha2.hash512("buffer-name")} \stoptext Is there any way to get "utilities.sha2.hash512" with the contents of the "abc" buffer? Many thanks for your help, Pablo