bad argument #1 to 'nettle_md5_init'

[xiangnanscu]

Hello. latest openresty and lua-resty-nettle (via opm). when I test like this:

    location = /test {
        content_by_lua_block {
local require = require
local print = print
local gsub = string.gsub
local byte = string.byte
local format = string.format
local ipairs = ipairs
local concat = table.concat

local function hex(str,spacer)
    return (gsub(str,"(.)", function (c)
        return format("%02X%s", byte(c), spacer or "")
    end))
end
local md5 = require "resty.nettle.md5"
ngx.say("md5      ", #md5(""), hex(md5("")))
local hash = md5.new()
hash:update("")
ngx.say("md5      ", #hash:digest(), hex(hash:digest()))
        }
    }

error raised:

2017/07/22 18:29:01 [error] 26288#26288: *834 lua entry thread aborted: runtime error: /usr/local/openresty/site/lualib/resty/nettle/md5.lua:22: bad argument #1 to 'nettle_md5_init' (cannot convert 'struct MD5state_st [1]' to 'struct md5_ctx *')
stack traceback:
coroutine 0:
	[C]: in function 'nettle_md5_init'
	/usr/local/openresty/site/lualib/resty/nettle/md5.lua:22: in function 'md5'
	content_by_lua(dev.conf:45):16: in function <content_by_lua(dev.conf:45):1>, client: 127.0.0.1, server: , request: "GET /test HTTP/1.1", host: "xxx.cn:9000"

[xiangnanscu]

Ubuntu server 14.04. When I run the code via luajit test.lua, no error. Seems only occur in OpenResty.

[xiangnanscu]

Find the reason, but don't know why.
if I use local resty_md5 = require "resty.md5" before requiring resty.nettle.md5, error occurs

[xiangnanscu]

error:

local resty_md5 = require "resty.md5"
local md5 = require "resty.nettle.md5"

no error:

local md5 = require "resty.nettle.md5"
local resty_md5 = require "resty.md5"

[xiangnanscu]

In the meantime, I've also found that I need to preload resty.nettle.md5 in the init_by_lua* phrase, otherwise (such as first load it when request comes)the error would raise.

[bungle]

They are two different libraries, and different interfaces.

resty.md5 comes from here (and uses OpenSSL):
https://github.com/openresty/lua-resty-string/blob/master/lib/resty/md5.lua

resty.nettle.md5 is the Nettle binding (and uses Nettle, obviously), and comes from here:
https://github.com/bungle/lua-resty-nettle/blob/master/lib/resty/nettle/md5.lua

[xiangnanscu]

@bungle hello, sorry, I don't quite get it. I know they are different, does that means I shouldn't use them together?

[bungle]

Can you provide a minimal example where the error occurs?

[xiangnanscu]

@bungle run mkdir logs tmp && nginx -p . -c nginx.conf

worker_processes  1;
user root root;

events {worker_connections  1024;}

http {

    access_log  logs/access.log;
    error_log  logs/error.log;

    client_body_temp_path tmp/client_body_temp;
    fastcgi_temp_path tmp/fastcgi_temp;
    proxy_temp_path tmp/proxy_temp;
    scgi_temp_path tmp/scgi_temp;
    uwsgi_temp_path tmp/uwsgi_temp;
    

    
    server {
        listen       8888;
        
        location / {
            content_by_lua_block {

local require = require
local print = print
local gsub = string.gsub
local byte = string.byte
local format = string.format
local ipairs = ipairs
local concat = table.concat
local resty_md5 = require "resty.md5"
local md5 = require "resty.nettle.md5"

local function hex(str,spacer)
    return (gsub(str,"(.)", function (c)
        return format("%02X%s", byte(c), spacer or "")
    end))
end
ngx.say("md5      ", #md5(""), hex(md5("")))
local hash = md5.new()
hash:update("")
ngx.say("md5      ", #hash:digest(), hex(hash:digest()))

            }
        }
    
    
    }

    
}

[bungle]

It looks like both define MD5_CTX.

[bungle]

@xiangnanscu,

I will rename those in my lib so they will not cause problems. With C there is no namespaces so I have to prefix those. Same could be suggested to OpenResty as well. But I will do it for this lib.

[xiangnanscu]

@bungle thank you, bungle. btw, lua-resty-nettle is very useful for me because hmacsha1 etc. Actually, if I must choose one, I'd choose yours. haha.