[smime] Use of subjectKeyIdentifier

HI!

If an S/MIME cert does not contain a subjectKeyIdentifier extension is a
sending S/MIME MUA allowed to generate RecipientInfos referencing the
receiver's cert by (self-calculated) subjectKeyIdentifier (instead of issuer
name and serial number)?

IMHO RFC 5750 is not really clear on that.

Ciao, Michael.
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