$folders = Get-Content -Path "./asurveiller.txt"

foreach ($folder in $folders) {
    $fichiers = Get-ChildItem -Path $folder -Recurse -File
    foreach ($fic in $fichiers) {
        $hash = Get-FileHash -Path $fic.FullName -Algorithm SHA256
        Add-Content -Path "./resultat.txt" -Value "$($hash.Hash)  $($fic.FullName)"
    }
}