Add a post about md5 checksum

_posts/2022-12-19-check-md5-checksum.md

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+---
+layout: post
+title: "How to check MD5 checksum of a downloaded file"
+tags: [md5, checksum]
+comments: true
+share: true
+---
+
+When downloading files for patching or drivers you may need to verify the file
+is complete. This can be done by verifying the MD5 checksum from the steps
+below on your PC or Mac workstation.
+
+## Windows
+
+### Step 1
+
+Open the Windows command line. Press Windows + R, type cmd and press Enter.
+(Alternative: You can also open command prompt or Windows PowerShell from the
+Start menu, of course.)
+
+### Step 2
+
+Go to the folder that contains the file whose MD5 checksum you want to check
+and verify. Command: Type `cd` followed by the path to the folder.
+(Tip: You can drag and drop a folder from Windows Explorer to insert the path.)
+
+### Step 3
+
+Type the command below
+
+```
+certutil -hashfile <file> MD5
+```
+
+Replace <file> with the filename.
+
+Tip: You can use the Tab key to have Windows complete the file name.
+Example to get the MD5 hash for the file Example.txt:
+
+```
+certutil -hashfile Example.txt MD5
+```
+
+### Step 4
+
+Press Enter.
+Compare the resulting checksum to what you expect:
+
+```
+Microsoft Windows [Version 10.0.19042.964]
+(c) Microsoft Corporation. All rights reserved.
+
+C:\Users\sukjun> cd Downloads
+
+C:\Users\sukjun\Downloads> certutil -hashfile Example.txt MD5
+MD5 hash of Example.txt
+a5d0173a59
+CertUtil: -hashfile command completed successfully.
+
+C:\Users\sukjun\Downloads>
+```
+
+## Mac
+
+### Step 1
+
+Open Terminal
+
+### Step 2
+
+Navigate to the folder that contains the file whose MD5 checksum you want to
+verify.
+
+### Step 3
+
+You can open Terminal right at a folder from Finder.
+
+### Step 4
+
+Type md5 followed by the filename
+
+```
+md5 <file>
+```
+
+(Dragging and dropping: You can also type md5, then drag and drop the file you
+want to check onto the Terminal window.)