Pkcs11_mechanism_listSourceAn element of type t is a structure made of a pointer to a C array, and its length.
The reason we use this type is that some PKCS#11 functions require a two step interraction, in which one first gives a null pointer (with length 0) to a function, which modifies the length of the list. Then, the user allocates memory for this list, and performs a second call to the function.
create () allocates a new t with length 0, and content the null pointer.
allocate t updates the content of the t structure to point to freshly allocated memory.