The type of the context passed to mbedtls_psa_external_get_random().

Mbed TLS initializes the context to all-bits-zero before calling mbedtls_psa_external_get_random() for the first time.

The definition of this type in the Mbed TLS source code is for demonstration purposes. Implementers of mbedtls_psa_external_get_random() are expected to replace it with a custom definition.