Rasmus Villemoes 3a16bd016f rpi-eeprom-digest: support specifying keys via PKCS#11 URI ...

In production setups, it is quite normal that the private key does not
exist as a file in the file system, but is kept inside some HSM,
remote signing service or similar, and only accessed via some pkcs#11
interface; moreover, by design, the private key _cannot_ be extracted
from the HSM or signing service.

In such a case, the user will have set OPENSSL_CONF to some
configuration file setting up the appropriate engine, and the "key" is
simply the pkcs#11 URI, e.g. "pkcs11:model=foo;object=bar".

In order to support this use case, automatically infer the appropriate
options to pass to openssl-dgst if "${KEY}" begins with
"pkcs11:". Doing this at the top level avoids duplicating the logic in
both writeSig and verifySig. While here, this also adds a sanity check
that -v can only be used while also providing a (public) key to check
against.

This drops the -keyform argument in the non-pkcs#11 case, as openssl
automatically infers the type, and this then in fact allows one to use
a private key in e.g. DER format.

Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>

2025-03-06 16:04:38 +00:00

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