pi_provider_handle
dca_prov_info1.pi_provider_handle = dca;
dca_prov_info2.pi_provider_handle = dca;
dprov_prov_info.pi_provider_handle = softc;
viorand_prov_info.pi_provider_handle = state;
prov_desc->pd_prov_handle = info->pi_provider_handle;
tpmrng_prov_info.pi_provider_handle = tpm;
crypto_provider_handle_t pi_provider_handle;
#define pi_provider_handle piu.piu_v1.pi_provider_handle
n2rng_prov_info.pi_provider_handle = n2rng;