Simple File Integrity Verifier in Powershell

Verify.psm1

function Create-Verification {
param([string] $Path = ".", [string] $Verify = "", [string] $Filter = "*.*")

    $Output = "$($Path | Split-Path -Leaf).sha2"

    $Table =
        Get-ChildItem -Path $Path | 
        Where-Object  { $_.Name -like $Filter -and $_.Name -ne $Output } | #Don't inculde the .sha2 file
        Sort-Object -Property Name | 
        Get-FileHash -Algorithm SHA256 | 
        Format-Table @{ Label = 'File'; Expression = { $_.Path | Split-Path -Leaf }}, Hash |
        Out-String -Stream

    if($Verify -eq "") {
        $Table | Out-File $Output
        Get-Content $Output
    }
    else {    
        Compare-Object ($Table | Select-Object -Skip 3) (Get-Content $Verify  | Select-Object -Skip 3) |
        Where-Object { $_ -ne $null } |
        Select-Object @{ Name = "Side"; Expression = { $_.SideIndicator } }, @{Name = "File"; Expression = { $_.InputObject.Split(' ')[0] } }        
    }
}

Usage

Drop it in your PowerShell modules directory in Verify\Verify.psm1.

In any folder, use

Create-Verification

to generate (current folder).sha2

The defaults are:

Create-Verification -Path . -Filter *.*

To verify, use:

Create-Verification -Verify (folder.sha2) 

-Path and -Filter options still apply.