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Dec 252018
 

In this post, I will demonstrate two ways to perform Shasum verification on Windows 10 computers.

Shasum checks are useful to ensure the integrity of your software downloads, i.e., making sure that the files are not tampered with.

When you run a shasum256 or shasum512 check on a file, you will get an output (a long sequence of numbers and alphabets).

You then check the output of your shasum check with the alphanumeric sequence provided by the software provider (for example, a Linux distro or LibreOffice).

If your output matches the alphanumeric sequence of numbers offered by the software provider, then your download is fine. If they don’t match, there’s an issue with your download and you must quickly discard it and run a virus-scan immediately.

The below shasum 256 checks were performed on a Dell Windows 10Pro notebook.

Two Methods for Shasum Check

Two quick methods for shasum verification on a Windows 10 computer are via Windows Powershell and through the Windows Command Prompt.

Powershell and Command Prompt are two different consoles in your Windows 10 system.

You can access either of them by typing in the search box located on the bottom panel of your Windows 10 system or by clicking Start—>Applications.

Powershell Method

First, I will use the Powershell technique to perform the shasum 256 verification of my LibreOffice software.

I have already downloaded the LibreOffice office suite to the Downloads folder of my Windows 10Pro laptop.

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

PS C:\Users\david> Get-FileHash -Path C:\Users\david\Downloads\LibreOffice_6.1.0_Win_x64.msi

Algorithm       Hash                                                                   Path
---------       ----                                                                   ----
SHA256          17D01F5E9B9944C5888FF41AC7D0C7D8AA93E84C5B5DF98183B0B287A2E7C77D       C:\Users\david\Downloads\Libre...

Important Note: If you’re trying to perform shasum checks, substitute your user name, specify the location of your download location and substitute the exact name of the software you downloaded before running the shasum verification check.

Command Prompt Method

Next, I opened the Command Prompt on my Dell Windows 10Pro notebook, and then typed in the following commands.

C:\Users\david>certutil -hashfile C:\Users\david\Downloads\LibreOffice_6.1.0_Win_x64.msi sha256
SHA256 hash of C:\Users\david\Downloads\LibreOffice_6.1.0_Win_x64.msi:
17d01f5e9b9944c5888ff41ac7d0c7d8aa93e84c5b5df98183b0b287a2e7c77d
CertUtil: -hashfile command completed successfully.

The alphanumeric output is the same with both methods and when I compare them to the numbers on the LibreOffice web site, I’m glad to note that they match.

This means the likelihood my LibreOffice download has been tampered with is low.

I repeated the above experiment with a CentOS 7 download (I intend to run CentOS 7 as a guest OS via Oracle VirtualBox software).

Command Prompt Method to Verify CentOS 7 Download

C:\Users\david>CertUtil -hashfile C:\Users\david\Downloads\Linux-ISOs\CentOS-7-x86_64-Minimal-1804.iso sha256
SHA256 hash of C:\Users\david\Downloads\Linux-ISOs\CentOS-7-x86_64-Minimal-1804.iso:
714acc0aefb32b7d51b515e25546835e55a90da9fb00417fbee2d03a62801efd
CertUtil: -hashfile command completed successfully.

Let’s try the Powershell method now for our CentOS 7 download.

Powershell Technique to Verify CentOS 7 Download

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

PS C:\Users\david> Get-FileHash -Path C:\Users\david\Downloads\Linux-ISOs\CentOS-7-x86_64-Minimal-1804.iso

Algorithm       Hash                                                                   Path
---------       ----                                                                   ----
SHA256          714ACC0AEFB32B7D51B515E25546835E55A90DA9FB00417FBEE2D03A62801EFD       C:\Users\david\Downloads\Linux...

Again, the output provided by both methods is the same and more importantly,they match the shasum256 figures provided by the CentOS 7 open source software maintainers.

Whether you’re using Windows, Mac or Linux, always perform a shasum verification of the software you downloaded to ensure you’re not infected with malware by bad actors.

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