Function mbedtls_sys::hkdf

pub unsafe extern "C" fn hkdf(
    md: *const md_info_t,
    salt: *const c_uchar,
    salt_len: usize,
    ikm: *const c_uchar,
    ikm_len: usize,
    info: *const c_uchar,
    info_len: usize,
    okm: *mut c_uchar,
    okm_len: usize
) -> c_int