Function mbedtls_sys::hkdf

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