* CKR_CRYPTOKI_ALREADY_INITIALIZED: This value can only be returned by
`C_Initialize`. It means that the Cryptoki library has already been
initialized (by a previous call to `C_Initialize` which did not have a
matching `C_Finalize` call).
* CKR_FUNCTION_NOT_SUPPORTED: The requested function is not supported by this
Cryptoki library. Even unsupported functions in the Cryptoki API should have a
“stub” in the library; this stub should simply return the value
CKR_FUNCTION_NOT_SUPPORTED.
* CKR_LIBRARY_LOAD_FAILED: The Cryptoki library could not load a dependent
shared library.
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