add_buffer_randomness_src
add_buffer_randomness_src(arandomness, cnt,
add_buffer_randomness_src(entropy, entropy_size, RAND_SRC_TPM);
add_buffer_randomness_src((const char *)&value, sizeof(value),
error = add_buffer_randomness_src(buf, c, RAND_SRC_SEEDING);
int add_buffer_randomness_src(const char *, int, int srcid);