egor-skriptunoff / pure_lua_sha Goto Github PK

Hi, I'm working on a side project for which I have to generate hashes for Ethereum, which uses the old padding of 1 instead of 6. Changing it on this line fixed it for me:

https://github.com/Egor-Skriptunoff/pure_lua_SHA/blob/master/sha2.lua#L4618

Is there any chance of making this configurable for a user of the module or would you accept a PR for this?

This is so one does not have to maintain one's own fork of this project.

(I use this project because of its speed, easy of use and also because I use LuaJit which a lot of other projects do not support (anymore).)

Reference: https://ethereum.stackexchange.com/questions/30369/difference-between-keccak256-and-sha3

First - thank you for your excellent work!.

I attach a short script showing a problem with bin2base64. The script generates a random 10 character string and attempts to convert it via base64 using sha.bin2base64 and compares it with another base64 algorithm. Mismatches are outputted.

I hope this helps you discover the bug in bin2base64.

Regards,

Tom

local sha = require 'sha2'

-- character table string
local b='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

-- encoding
function encode_b64(data)
return ((data:gsub('.', function(x)
local r,b='',x:byte()
for i=8,1,-1 do r=r..(b%2^i-b%2^(i-1)>0 and '1' or '0') end
return r;
end)..'0000'):gsub('%d%d%d?%d?%d?%d?', function(x)
if (#x < 6) then return '' end
local c=0
for i=1,6 do c=c+(x:sub(i,i)=='1' and 2^(6-i) or 0) end
return b:sub(c+1,c+1)
end)..({ '', '==', '=' })[#data%3+1])
end

local charset = {}
for i = 0, 255 do table.insert(charset, string.char(i)) end
math.randomseed(os.time())

function string.random(length)

if length > 0 then
return string.random(length - 1) .. charset[math.random(1, #charset)]
else
return ''
end
end

for i=1,100 do
local s = string.random(10)
if encode_b64(s) ~= sha.bin2base64(sha.hex2bin(s)) then
print('error',encode_b64(s),sha.bin2base64(sha.hex2bin(s)))
end
end

For string "test"
your lib output is: 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08
openssl output is: f2ca1bb6c7e907d06dafe4687e579fce76b37e4e93b7605022da52e6ccc26fd2

Possible add mime encoding-decoding + other popular formats for your choice? So add mime & base64 to tags project. Your script like me - very fast, good job.

Hi, I think that your code isn't accurately detecting Lua 5.1.5 on OpenWrt. Using a simple sha.sha256("test") generates the following error:

lua: ./sha2.lua:309: bad argument #2 to 'string_format' (integer expected, got number)
stack traceback:
        [C]: in function 'string_format'
        ./sha2.lua:309: in function 'HEX'
        ./sha2.lua:2467: in function <./sha2.lua:2433>
        (tail call): ?
        (tail call): ?
        shatest.lua:12: in function 'test'
        shatest.lua:16: in main chunk
        [C]: ?

Is there anything I can do to help debug?

something like this (for luajit 2.1):
local ffi=require 'ffi'
local C,ibuf,obuf = ffi.C,ffi.new("unsigned char[?]",buf_size),ffi.new("unsigned char[?]",buf_size*2)
while true do
local n = tonumber(C.fread(ibuf,1,ffi.sizeof(ibuf),f_in))
if n==0 then break end
for i=0,n-1 do
local low = ibuf[i]%16
local high = bit.rshift(ibuf[i],4)
obuf[i+i] = high<10 and high+48 or high+55
obuf[i+i+1] = low<10 and low+48 or low+55
end
C.fwrite(obuf,1,n+n,f_out)
end

Thanks for very good (fast!) checksum library

Example:
-- VERSION: 12 (2022-02-23)
-- AUTHOR: Egor Skriptunoff
-- LICENSE: MIT (the same license as Lua itself)
-- URL: https://github.com/Egor-Skriptunoff/pure_lua_SHA