Powershell-Abfrage, ob Passwort sicher ist

IsItPwned.PS1

Function Get-PwnedPasswordCounter ($password) {

  # Hashstring erzeugen
  $sha1=[System.Security.Cryptography.SHA1]::Create()
  $sha1Hash=$sha1.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($password))
  $sha1HashString=[System.BitConverter]::ToString($sha1Hash).Replace('-','')
  $hashPrefix=$sha1HashString.Substring(0,5)
  $hashSuffix=$sha1HashString.Substring(5)

  # pwnedpasswords-API anrufen
  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
  $wr=Invoke-WebRequest -Uri "https://api.pwnedpasswords.com/range/$hashPrefix" -UseBasicParsing

  # Ergebnis auswerten und Count ermitteln
  If ($wr.StatusCode -eq 200) {
    $regexPattern="(?<hash>$hashSuffix.*):(?<count>\d+)"
    $parseRangeRegex=[regex]::new($regexPattern, [System.Text.RegularExpressions.RegexOptions]::Multiline -bor [System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
    $match=$parseRangeRegex.Match($wr.Content)
    If ($match.Success) {
      $match.Groups["count"].Value
    }
  }

}

based on https://github.com/Philo/IsItPwned/blob/master/src/PwnedPasswordClient.cs
sowie https://www.troyhunt.com/ive-just-launched-pwned-passwords-version-2/