epg encrypt non interactive

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I want encrypt a string using GPG (epg/epa)

I think that (epg-encrypt-string) is my function to it:


(epg-encrypt-string CONTEXT PLAIN RECIPIENTS &optional SIGN
ALWAYS-TRUST)

Encrypt a string PLAIN.
If RECIPIENTS is nil, it performs symmetric encryption.


(let ((context (epg-make-context 'OpenPGP)))
  (epg-encrypt-string context "hi" "???"))


I need a key as RECIPIENT not symmetric encryption.

RECIPIENTS can be insert interactively easy, for example using:

(epa-select-keys (epg-make-context epa-protocol) ""
"recipient@example.org")

but not so without `interactive'


how can I do? any funct that return a key?