add support for CKA_MODIFIABLE and CKA_DESTROYABLE attributes #116
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This PR improves support for CKA_COPYABLE and CKA_MODIFIABLE attributes. These attributes were technically available in PyKCS11, but weren't handled properly as bool values.
By the way, one of the problems was the absence of attributes' definition in your pkcs11.h file; this is apparently because of the old (2.20) PKCS#11 specification this file originates from. And since, PyKCS11 supports some mechanisms from newer PKCS#11 specification (e.g. CKM_AES_GCM), I'd consider upgrading to a new version of the PKCS#11 headers.