'CMD batch - encode file to base 64 and trim characters and new line
I'm trying to make a batch file from CMD with the following commands:
- Convert file to base 64 - using certutil command this is how the contents of the base 64 looks like (B64.txt):
- Trim the base 64 - basically, I want to remove -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- this part is done, the only thing left is trim the newline characters to make a one liner of base64, because I will be passing this to a request payload.
This is what I did so far:
@ECHO OFF
cd /filePath
certutil -encode sample.pdf B64.txt
type B64.txt | find /V "-----BEGIN CERTIFICATE-----" | find /V "-----END CERTIFICATE-----" > B64.txt
My question is:
Using the command find /V* how can I define the new line characters and remove them?
Is there a more efficient way to do this?
Can this also be done without assigning the base 64 as a variable? It turns out that the limit for variables is only around 9000 characters, and the base 64 I convert normally has 70,000 characters.
Solution 1:[1]
There is a really simple solution using undocumented features of CERTUTIL. You can use the-ENCODEHEX
verb with an undocumented format at the end to directly get your desired output of base 64 all on one line without any headers.
certutil -encodehex -f sample.pdf B64.txt 0x40000001
See the DosTips More Tricks with certutil thread for more information. Especially look at this 4th post for a detailed explanation of all the format options.
Solution 2:[2]
- Edit:
You can use a bat/cmd file with a c# code.
Then you will compile it and run it at run time to get all the strings in one line ...
- Usage:
1) Edit: cd /d "D:\Path\to\file\"
, adding the drive:\and\path\to\your\directory
2) Save this code below as File OneLine.cmd
/* 2>nul & @cls & @echo off & title <nul & title %~nx0 & setlocal enabledelayedexpansion
cd /d "D:\Path\to\file\" && set "_b64_file=%__CD__%\B64.txt"
"%__APPDIR__%certutil.exe" -encode -f ".\sample.pdf" "!_b64_file!" >nul
for /f "tokens=*" %%c in ('%__APPDIR__%where.exe /r "c:\Windows\Microsoft.NET" csc.exe
')do >2nul >nul "%%~c" /t:exe /out:"%tmp%\OneLine.exe" "%~f0" /platform:anycpu /unsafe+ /w:0 /o /nologo && goto :next
:next
"%tmp%\OneLine.exe" & 2>nul >nul del /q /f "%tmp%\OneLine.exe" & endlocal && goto :EOF || rem :: */
using System; using System.IO;using System.Text;namespace OneLineB64 {class Program {static void Main(string[] args){
String Path = System.Environment.GetEnvironmentVariable("_b64_file");String alllines = (File.ReadAllText(Path).Replace(Environment.NewLine, ""));
alllines = alllines.Remove(0,27); alllines = alllines.Remove((alllines.Length)-25);File.WriteAllText(Path, alllines);}}}
- Same code in conventional formatting/layout
/* 2>nul & @cls
@echo off
title <nul
title %~nx0
setlocal enabledelayedexpansion
cd /d "D:\Path\to\file\"
set "_b64_file=%__CD__%\B64.txt"
"%__APPDIR__%certutil.exe" -encode -f ".\sample.pdf" "!_b64_file!" >nul
for /f "tokens=*" %%c in ('%__APPDIR__%where.exe /r "c:\Windows\Microsoft.NET" csc.exe')do (
>2nul >nul "%%~c" /t:exe /out:"%tmp%\OneLine.exe" "%~f0" /platform:anycpu /unsafe+ /w:0 /o /nologo && goto :next
)
:next
"%tmp%\OneLine.exe"
2>nul >nul del /q /f "%tmp%\OneLine.exe"
endlocal
goto :EOF
*/
using System;
using System.IO;
using System.Text;
namespace OneLineB64
{
class Program
{
static void Main(string[] args)
{
String Path = System.Environment.GetEnvironmentVariable("_b64_file");
String alllines = (File.ReadAllText(Path).Replace(Environment.NewLine, ""));
alllines = alllines.Remove(0,27);
alllines = alllines.Remove((alllines.Length)-25);
File.WriteAllText(Path, alllines);
}
}
}
SubString/Remove Characters in String
Get System Environment Variable string
Environment.GetEnvironmentVariable Method
- /end Edit:
Understanding the maximum character limit in the variable length, it is not possible to do it beyond 8191 digits/characters
For remove lines you can use only certificate, because this word is present in 1st and last line.
certutil
+ -f
for overwrite file out if exist
type B64.txt^|"%__APPDIR__%find.exe" /v "CERTIFICATE"
will ignore the 1st and last line
set "_b64=!_b64!%%~b"
will save line by line in the same variable/1 line
>B64.txt echo/!_b64!
will replace/overwrite the contents of the file with the value saved in the variable (b64 strings on one line)
@echo off && setlocal enabledelayedexpansion
cd /d "d:\filePath" && set "_b64="<nul
"%__APPDIR__%certutil.exe" -encode -f sample.pdf B64.txt >nul && for /f %%b in (
'type B64.txt^|"%__APPDIR__%find.exe" /v "CERTIFICATE"')do set "_b64=!_b64!%%~b"
>B64.txt set/p "'=!_b64: =!"<nul & endlocal && exit /b
Same code in conventional layout:
@echo off
setlocal enabledelayedexpansion
cd /d "d:\filePath"
set "_b64="<nul
"%__APPDIR__%certutil.exe" -encode -f sample.pdf B64.txt >nul
for /f %%b in ('type B64.txt^|"%__APPDIR__%find.exe" /v "CERTIFICATE"')do set "_b64=!_b64!%%~b"
>B64.txt set/p "'=!_b64: =!"<nul
endlocal
goto :EOF
Solution 3:[3]
This may do what you want. If you are on a supported Windows system, PowerShell will be available.
SET "FILENAME=C:\src\t\sample.pdf"
SET "OUTFILENAME=C:\src\t\B64.txt"
powershell -NoLogo -NoProfile -Command ^
"[Convert]::ToBase64String([IO.File]::ReadAllBytes('%FILENAME%')) |" ^
"Out-File -FilePath '%OUTFILENAME%' -Encoding ascii -NoNewline"
Solution 4:[4]
Can you send link to B64.txt or content of filePath or paste text here? My OCR can't get 100% conversion, even Google Lens can't.
My understanding is you need a base 64 code in one line without headers, right?
Certutil
can handle 70k chars. set /p
to avoid new lines.
One line output for base64 without cert headers example:
certutil -f -encodehex "Fujitsu Air Con Manual.pdf" test.b64 1
for /f %i in (test.b64) do set /p=%i<nul
Output may be redirected to file or via pipe for "passing this to a request payload"
Tested on Win 10: @ 2.5 Million characters.
dir test.b64
Volume in drive C is Local Disk
Volume Serial Number is 74F6-ACFC
Directory of C:\Users\Al\Desktop
05/05/2022 12:12 **2,677,662** test.b64
1 File(s) 2,677,662 bytes
0 Dir(s) 54,901,383,168 bytes free
for /f %i in (test.b64) do set /p=%i<nul>> one.line
dir one.line
Volume in drive C is Local Disk
Volume Serial Number is 74F6-ACFC
Directory of C:\Users\Al\Desktop
05/05/2022 13:00 **2,596,560** one.line
1 File(s) 2,596,560 bytes
0 Dir(s) 54,812,700,672 bytes free
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
Solution | Source |
---|---|
Solution 1 | dbenham |
Solution 2 | |
Solution 3 | |
Solution 4 | Zimba |