The library libkcapi uses the data structure struct kcapi_handle as the cipher handle that allows the consumer to operate with the various function calls of this library.
Unlike other crypto libraries, libkcapi does not allocate any memory or performs operations that implies memory allocation. struct kcapi_handle only holds pointers to the consumer-provided buffers with sensitive data. That means that the buffers holding sensitive data like keys are under full control of the consumer. Therefore, this library does not offer any memory allocation or secure memory clearing functions.
The consumer must ensure that the memory is appropriately sanitized. The caller does not need to sanitize struct kcapi_handle as it does not contain any sensitive data.