Function boring_sys::HKDF

pub unsafe extern "C" fn HKDF(
    out_key: *mut u8,
    out_len: usize,
    digest: *const EVP_MD,
    secret: *const u8,
    secret_len: usize,
    salt: *const u8,
    salt_len: usize,
    info: *const u8,
    info_len: usize
) -> c_int