Function mbedtls_sys::md_hmac

pub unsafe extern "C" fn md_hmac(
    md_info: *const md_info_t, 
    key: *const c_uchar, 
    keylen: size_t, 
    input: *const c_uchar, 
    ilen: size_t, 
    output: *mut c_uchar
) -> c_int