Windows PowerShell Profile

Microsoft.PowerShell_profile.ps1

function Test-FileHash {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory)]
        [string] $Path,

        [Parameter(Mandatory)]
        [string] $Hash,

        [ValidateSet("SHA1", "SHA256", "SHA512")]
        [string] $Algorithm = "SHA256"
    )

    $ExpectedHash = $Hash.ToLowerInvariant()
    $ActualHash = (Get-FileHash -Path $Path -Algorithm $Algorithm).Hash.ToLowerInvariant()
    $Match = $ActualHash -ceq $ExpectedHash

    $Result = [PSCustomObject]@{
        Path         = $Path
        Match        = $Match
        ExpectedHash = $ExpectedHash
        ActualHash   = $ActualHash
        Algorithm    = $Algorithm
    }
    Write-Output $Result
}

function Test-CheckSumFile {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory)]
        [string] $Path
    )

    $SUPPORTED_ALGORITHMS = "SHA1", "SHA256", "SHA512"

    $Algorithm = [System.IO.Path]::GetExtension($Path).Substring(1).ToUpperInvariant()
    if ($Algorithm -cnotin $SUPPORTED_ALGORITHMS) {
        throw "The file extension does not match a supported algorithm."
    }

    $PathParent = Split-Path -Path $Path -Parent -Resolve

    $Lines = Get-Content -Path $Path
    foreach ($Line in $Lines) {
        $Fields = -split $Line
        $ExpectedHash = $Fields[0]
        $FileName = $Fields[1]

        if ($FileName.StartsWith([char] "*")) {
            $FileName = $FileName.Substring(1)
        }

        try {
            $FilePath = Join-Path -Path $PathParent -ChildPath $FileName -Resolve -ErrorAction Stop
        }
        catch {
            Write-Warning "Can not get file path for file name '$FileName'"
            continue
        }

        $Result = Test-FileHash -Path $FilePath -Hash $ExpectedHash -Algorithm $Algorithm
        Write-Output $Result
    }
}