def au.mkey
import bend-osdev-aead@0.1.0.0/check.bend as Checkimport Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
import bend-osdev-crypto@0.1.0.0/crypto.bend as Cr
import bend-osdev-crypto@0.1.0.0/inst_sha2.bend as SH
import bend-osdev-crypto@0.1.0.0/hmac.bend as Hm
114def au.mkey(o: B.Octets) -> Result<&2, &2, Cr.CrError, Hm.CrHmacKey>:
115 Hm.CrHmac.key_of(~64n, ~SH.CrSha2.sha256, o)