Tuesday, February 11, 2020

Using certutil.exe to transfer files

1.) create a file to encode/transfer

> Add-Content test.txt "a test"

2.) pack it up as a certificate before transfer

> $raw = get-content -path test.txt -Encoding Byte
> $b64 = [System.Convert]::ToBase64String($raw)
> $begin = "-----BEGIN CERTIFICATE-----"
> $end = "-----END CERTIFICATE-----"
> "$begin$b64$end"|Out-File output.txt

3.) transfer it however you like

4.) receiving end decodes it back to original state with certutil

> certutil.exe -decode output.txt decoded.txt
> get-content decoded.txt
      a test



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explanation
- create a file you want to encode/transfer
- convert it to raw bytes
- base64 it
- wrap it into a legit certificate file

- now you can transfer it

- then on the receiving end use certutil.exe to decode it back to it's original state

1 comment:

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