# Export Bitlocker info

# Init
$REPORT = ""
$SKIPPED_PROPERTIES = @(
  "CapacityGB",
  "MountPoint",
  "KeyProtector"
)

# Functions
function Convert-BytesToString ($bytes) {
  If ($bytes -gt 1PB) {
    return ("{0:0.#} PB" -f ($bytes / 1PB) )
  } ElseIf ($bytes -gt 1TB) {
    return ("{0:0.#} TB" -f ($bytes / 1TB) )
  } ElseIf ($bytes -gt 1GB) {
    return ("{0:0.#} GB" -f ($bytes / 1GB) )
  } ElseIf ($bytes -gt 1MB) {
    return ("{0:0.#} MB" -f ($bytes / 1MB) )
  } ElseIf ($bytes -gt 1KB) {
    return ("{0:0.#} KB" -f ($bytes / 1KB) )
  } Else {
    return ("{0} B" -f $bytes)
  }
}


# Build report
$system_drive = $env:SystemDrive
if ($system_drive -eq "X:") {
  # Assuming we're running in WinPE
  $system_drive = "C:"
}
Get-BitlockerVolume -MountPoint $system_drive | ForEach-Object {
  $bitlocker_volume = $_
  $REPORT += ("`n`nDrive {0}`n---`n" -f $bitlocker_volume.MountPoint)

  # Size info
  $volume = Get-Volume -DriveLetter $bitlocker_volume.MountPoint[0]
  $total = Convert-BytesToString ($volume.Size)
  $used = Convert-BytesToString ($volume.Size - $volume.SizeRemaining)
  if ($volume.Size -gt 0) {
    $REPORT += ("Size: {0} ({1} used)`n" -f $total, $used)
  } else {
    $REPORT += "Size: Unknown`n"
  }

  # Volume info
  $bitlocker_volume |
  Get-Member -MemberType Property |
  Where-Object {! $SKIPPED_PROPERTIES.Contains($_.Name)} |
  ForEach-Object {
    $name = $_.Name
    if ($bitlocker_volume.$name -ne $null) {
      $REPORT += ("{0}: {1}`n" -f $name, $bitlocker_volume.$name)
    }
  }

  # Key info
  $bitlocker_volume.KeyProtector |
  ForEach-Object {
    $key = $_
    $REPORT += "Key Slot:`n"
    $key |
    Get-Member -MemberType Property |
    ForEach-Object {
      $name = $_.Name
      if ($key.$name -ne $null -and $key.$name -ne "") {
          $REPORT += ("... {0}: {1}`n" -f $name, $key.$name)
      }
    }
  }
}

# Show report
Write-Host $REPORT.Trim()

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