【网络通信】成就分享卡片：分享数据的序列化与防伪校验设计

local function makeShareCard(actor, achId)
    local player = class(actor)
    local payload = achId .. "|" .. class(actor):GetName() .. "|" .. os.date("%Y%m%d")
    local checksum = 0
    for i = 1, #payload do
        checksum = (checksum + string.byte(payload, i) * i) % 9973
    end
    local card = payload .. "|" .. checksum
    sendluamsg(actor, 8701, 0, 0, 0, card)
end

local function verifyCard(card)
    local payload, checksum = string.match(card, "(.+)|(%d+)")
    if payload == nil then return false end
    local sum = 0
    for i = 1, #payload do
        sum = (sum + string.byte(payload, i) * i) % 9973
    end
    return tonumber(checksum) == sum
end