Lennart Poettering 3f31c8ff46 pkcs7-util: add helpers for extracting signer info from PKCS7 signatures
Once we start measuring Verity volumes as we activate them we want to
include information about the signature keys used, so that we can have
distinct ones for confext and for sysext and ther purposes and thus have
a cryptograpically protected hint about the kind of image we have
activated in the event log.

Ideally we'd measure a fingerprint of the signing certificate here, but
we don't have that here typically (as PKCS7 signatures used here
typically do not embed that), hence use the next best thing: the issuer
name and the serial number.
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