Question

I am trying to generate sha256 hash of a string in a batch script.

For this purpose I found sha256sum.exe (link)
this application accepts file arguments only.

Thus I need to create a file with the string, and no trailing space nor CR or LF.

in my batch script I did:

echo.|set /P =%var%>temp.txt
sha256sum temp.txt > temp2.txt

I used the first line to remove CR & LF however in temp.txt file I see a single trailing space char, which is then used by sha256sum.exe.

I am trying to get rid of that trailing space character at the end of the first line of the text file.

I am a linux user and I wasn’t expecting such a simple thing to be a problem.
Thanks in advance.

Answer 1

Simplest thing would be to replace all whitespace;

set h=0x0C29A1BCD3DC8425712A0107B6693361CCBBABAC 
echo."%h%"
set h=%h: =%
echo."%h%"

>> "0x0C29A1BCD3DC8425712A0107B6693361CCBBABAC "
>> "0x0C29A1BCD3DC8425712A0107B6693361CCBBABAC"

Edit

Sorry, I didnt realise the extra space was in the written value, how about

@echo off
set var=hashme
for %%a in (%var%) do (
echo/|set /p ="%%a"
)>temp.txt

FOR /F "tokens=1" %%i in ('sha1sum temp.txt') do SET var=%%i 
echo "%var:~0,-1%"

I downloaded that sha1sum.exe and for "hashme" the output is correct;

"fb78992e561929a6967d5328f49413fa99048d06"