Function to Get Checksum of File with Powershell and write it (SHA1, SHA256, SHA384, SHA512, MD5)

Get_Checksum.md

About

Powershell support the following hashing algorithm:

• SHA1
• SHA256
• SHA384
• SHA512
• MD5

I created simple script that you can add to your powershell $PROFILE

The script

function Get-FileChecksum {
    param (
        [string]$FilePath,
        [string]$Algorithm = "MD5",
        [switch]$WriteToFile
    )

    if (-not (Test-Path -Path $FilePath -PathType Leaf)) {
        Write-Error "File not found: $FilePath"
        return
    }

    $hash = Get-FileHash -Path $FilePath -Algorithm $Algorithm | Select-Object -ExpandProperty Hash

    if ($WriteToFile) {
        $checksumFileName = "$FilePath.$Algorithm"
        $hash | Set-Content -Path $checksumFileName -Force
        Write-Output "Checksum written to $checksumFileName"
    } else {
        Write-Output $hash
    }
}

Usage examples:

1. Calculate checksum with default algorithm set (MD5) and display it:

Get-FileChecksum -FilePath "C:\Path\To\YourInstaller.exe"

2. Calculate SHA-256 checksum and write it to a file:

Get-FileChecksum -FilePath "C:\Path\To\YourInstaller.exe" -Algorithm SHA256 -WriteToFile

This will write the checksum to a file with the format "YourInstaller.exe.SHA256" in the same directory as the installer.