This is an Openssl 3.x provider to access Hardware or Software Tokens using the PKCS#11 Cryptographic Token Interface
This code targets version 3.0 of the interface but should be backwards compatible to previous versions as well.
Spec: https://docs.oasis-open.org/pkcs11/pkcs11-base/v3.0/os/pkcs11-base-v3.0-os.html