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PowerShell Compare and Get Hash File

 Hash File comparison is a good thing to do, to make sure that file in transit, transferred, downloaded, or copied over is not corrupted or has been altered or modified.

PowerShell has a built-in module to do this that makes life easier and an easy task to do.

Here's an example code snippet to do this:

#Path location of the file

$file="C:\Users\User1\Downloads\Win10_22H2_EnglishInternational_x64.iso"

# Get the file hash

$hashSrc = Get-FileHash $file -Algorithm "SHA256"

write-output $hashSrc


#copy the Hash file 

$Display_hash_only = $hashSrc | Select-Object -Property Hash | ft -HideTableHeaders

Write-Output $Display_hash_only

Output of the write-output $hashSrc command, will show the Algorithm used, the Hash of the file and path location of the file.

Algorithm : SHA256 

Hash: AC5522F9DB9F4F432A1AADE69FEF268C8C0B5FD3F22D3A6987719752F8A7108 

 Path : C:\Users\User1\Downloads\Win10_22H2_EnglishInternational_x64.iso

 After getting the Hash File run this code snippet below to compare the string. Compare the original Hash file and the output of the Hash file from above script.

$source_hash_file = "3AC5522F9DB9F4F432A1AADE69FEF268C8C0B5FD3F22D3A6987719752F8A7108"

$to_compare_hash_file = "3AC5522F9DB9F4F432A1AADE69FEF268C8C0B5FD3F22D3A6987719752F8A7108"


#compare hash file ignore case 

$check = $to_compare_hash_file -eq $source_hash_file

Write-Output $check


#Compare if file hash matches

if ($check -eq "True") {

    Write-Output "File Hash Matches"

} else{

     Write-Output "File Hash does not Match"

}

That's it, if the Hash File Matches then the file is same as the original source file, however, if the Hash File does not match, then there's something wrong with the file.


Cheers! Take care. Till next Time.

Stay safe! and Keep things up! 

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