construct_tls1_prf_params
params = construct_tls1_prf_params("sha256", "secret", "seed");
params = construct_tls1_prf_params("sha256", "", "seed");
params = construct_tls1_prf_params("sha256", "1", "seed");
params = construct_tls1_prf_params("sha256", "secret", "");
params = construct_tls1_prf_params("sha256", "secret", "1");
params = construct_tls1_prf_params("sha256", "secret", "seed");
params = construct_tls1_prf_params("blah", "secret", "seed");