OpenSSL 3 deprecated the ENGINE API that was used to access smartcards via PKCS11. The new way to plug cryptographic accelerators and hardware is an "OpenSSL provider". This talk will discussed changes, good and bad, both for application developers and people interested in learning what it takes to developer a provider in its own right. It will be a mix of lessons learned from developing a pkcs11 provider for OpenSSL as well as opportunities unlocked by this new extension paradigm.
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