Function EVP_RAND_generate 

pub unsafe extern "C" fn EVP_RAND_generate(
    ctx: *mut EVP_RAND_CTX,
    out: *mut c_uchar,
    outlen: usize,
    strength: c_uint,
    prediction_resistance: c_int,
    addin: *const c_uchar,
    addin_len: usize,
) -> c_int