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如何从 Lua 生成 websocket 握手？

发布于 2025-01-07 08:24:32 字数 201 浏览 1 评论 0原文

Lua中是否有现有的函数可以生成服务器响应密钥？这是Python中的解决方案：websocket握手问题

我确实捕获了两个关键数字，计算了空格，捕获第三个字符串并希望其余部分位于现有函数中......

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趁年轻赶紧闹 2025-01-14 08:24:32

如果需要旧的握手（协议 0），您可以使用以下代码从两个密钥获取握手值：

md5 = require 'md5'

function getnumbers(str)
    local num = ""
    str:gsub('%d', function(d) num = num .. d end)
    return tonumber(num)
end
function countspaces(str)
    return select(2, str:gsub(' ', ' '))
end
function to32bitint(i)
    return string.char(i/256^3 % 256, i/256^2 % 256, i/256 % 256, i % 256)
end
function websocketresponse(key1, key2, end8)
    local n1, s1 = getnumbers(key1), countspaces(key1)
    local n2, s2 = getnumbers(key2), countspaces(key2)
    local cat = to32bitint(n1/s1) .. to32bitint(n2/s2) .. ending8
    return md5.sum(cat)
end

websocket_key1 = "18x 6]8vM;54 *(5:  {   U1]8  z [  8"
websocket_key2 = "1_ tx7X d  <  nw  334J702) 7]o}` 0"
ending8 = "Tm[K T2u"
print(websocketresponse(websocket_key1, websocket_key2, ending8))
--> fQJ,fN/4F4!~K~MH

这会产生与协议草案。此示例使用 MD5 库来计算校验和，并可在 LuaForWindows。

WebSocket 协议版本 6 的实现要简单得多：

crypto = require 'crypto'
mime = require 'mime'

function websocketresponse6(key)
    local magic = key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
    return (mime.b64(crypto.digest('sha1', magic, true)))
end 

key6 = "x3JJHMbDL1EzLkh9GBhXDw=="
print(websocketresponse6(key6))
--> HSmrc0sMlYUkAGmm5OPpG2HaGWk=

此示例使用 LuaCrypto 进行 SHA1 总和和 MIME。

If need the older handshake (protocol 0), you can use the following code to get the handshake value from the two keys:

md5 = require 'md5'

function getnumbers(str)
    local num = ""
    str:gsub('%d', function(d) num = num .. d end)
    return tonumber(num)
end
function countspaces(str)
    return select(2, str:gsub(' ', ' '))
end
function to32bitint(i)
    return string.char(i/256^3 % 256, i/256^2 % 256, i/256 % 256, i % 256)
end
function websocketresponse(key1, key2, end8)
    local n1, s1 = getnumbers(key1), countspaces(key1)
    local n2, s2 = getnumbers(key2), countspaces(key2)
    local cat = to32bitint(n1/s1) .. to32bitint(n2/s2) .. ending8
    return md5.sum(cat)
end

websocket_key1 = "18x 6]8vM;54 *(5:  {   U1]8  z [  8"
websocket_key2 = "1_ tx7X d  <  nw  334J702) 7]o}` 0"
ending8 = "Tm[K T2u"
print(websocketresponse(websocket_key1, websocket_key2, ending8))
--> fQJ,fN/4F4!~K~MH

This produces the same value as the example given in the protocol draft. This example uses MD5 library to calculate the checksum and is available compiled in LuaForWindows.

The implementation for WebSocket protocol version 6 is much simpler:

crypto = require 'crypto'
mime = require 'mime'

function websocketresponse6(key)
    local magic = key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
    return (mime.b64(crypto.digest('sha1', magic, true)))
end 

key6 = "x3JJHMbDL1EzLkh9GBhXDw=="
print(websocketresponse6(key6))
--> HSmrc0sMlYUkAGmm5OPpG2HaGWk=

This example uses the LuaCrypto for SHA1 sum and MIME from LuaSocket.

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