【PowerShell】iTextSharpでPDFを暗号化する

1
function Encrypt-PdfWithITextSharp {
2
  <#
3
  .SYNOPSIS
4
    Encrypts the specified PDF file.
5
  .DESCRIPTION
6
    Encrypts a PDF file using the iTextSharp library.
7
  .PARAMETER InputPath
8
    The path to the PDF file to encrypt.
9
  .PARAMETER OutputPath
10
    The output path for the encrypted PDF file.
11
  .PARAMETER Password
12
    The encryption password for the PDF file.
13
  .PARAMETER iTextSharpPath
14
    The iTextSharpPath library file.
15
  .EXAMPLE
16
    Encrypt-PdfWithITextSharp -InputPath "C:\Input.pdf" -OutputPath "C:\Encrypted_Output.pdf" -Password "YourStrongPassword"
17
  #>
18

19
  param (
20
    [string]$InputPath,
21
    [string]$OutputPath,
22
    [string]$Password,
23
    [string]$ITextSharpPath
24
  )
25

26
  # Load iTextSharp.dll
27
  if (-not ([System.AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.Location -eq $ITextSharpPath })) {
28
    Unblock-File -Path $iTextSharpPath;
29
    Add-Type -Path $ITextSharpPath
30
  }
31
  Write-Host ("{0}: InputPath:" -f $MyInvocation.MyCommand.Name);
32
  Write-Output $InputPath;
33
  Write-Host ("{0}: OutputPath:" -f $MyInvocation.MyCommand.Name);
34
  Write-Output $OutputPath;
35
  Write-Host ("{0}: ITextSharpPath:" -f $MyInvocation.MyCommand.Name);
36
  Write-Output $ITextSharpPath;
37

38
  $permissions = [iTextSharp.text.pdf.PdfWriter]::ALLOW_PRINTING -bor [iTextSharp.text.pdf.PdfWriter]::ALLOW_COPY -bor [iTextSharp.text.pdf.PdfWriter]::ALLOW_MODIFY_ANNOTATIONS # Set permissions
39
  Write-Host ("{0}: permission set" -f $MyInvocation.MyCommand.Name);
40

41
  try {
42
    # Create instances of PDFReader and PDFStamper
43
    $pdfReader = New-Object iTextSharp.text.pdf.PdfReader($InputPath)
44
    Write-Host ("{0}: PDF reader loaded.`n" -f $MyInvocation.MyCommand.Name);
45
    $pdfStamper = New-Object iTextSharp.text.pdf.PdfStamper($pdfReader, (New-Object System.IO.FileStream($OutputPath, [System.IO.FileMode]::Create)))
46
    Write-Host ("{0}: encrypting PDF.`n" -f $MyInvocation.MyCommand.Name);
47

48
    # Encrypt the PDF
49
    $ownerPassword = $Password # Set owner password
50
    $userPassword = $Password # Set user password
51
    Write-Host ("{0}: ownerPassword:" -f $MyInvocation.MyCommand.Name);
52
    Write-Output $ownerPassword;
53
    Write-Host ("{0}: userPassword:" -f $MyInvocation.MyCommand.Name);
54
    Write-Output $userPassword;
55
    $pdfStamper.Writer.SetEncryption(
56
      [System.Text.Encoding]::UTF8.GetBytes($userPassword),
57
      [System.Text.Encoding]::UTF8.GetBytes($ownerPassword),
58
      $permissions,
59
      [iTextSharp.text.pdf.PdfWriter]::ENCRYPTION_AES_256
60
    )
61

62
    # Close PDFStamper and release resources
63
    Write-Host ("{0}: closing PDF.`n" -f $MyInvocation.MyCommand.Name);
64
    $pdfStamper.Close()
65
    $pdfReader.Close()
66

67
    Write-Host ("{0}: PDF encryption complete.`n" -f $MyInvocation.MyCommand.Name);
68
  }
69
  catch {
70
    Write-Error "An error occurred during PDF encryption. Details: $($Error[0].Message)"
71
  }
72
}
73

74
function Encrypt-MultiPdfWithITextSharp(){
75
  <#
76
  .SYNOPSIS
77
    Encrypts multiple PDF files.
78
  .DESCRIPTION
79
    Encrypts multiple PDF files using the iTextSharp library.  The output files are named with "_encrypted" appended before the .pdf extension.
80
  .PARAMETER ImgPathList
81
    An array of paths to the PDF files to encrypt.
82
  .PARAMETER Password
83
    The encryption password for the PDF files.
84
  .PARAMETER iTextSharpPath
85
    The path to the iTextSharp library DLL.
86
  .EXAMPLE
87
    Encrypt-MultiPdfWithITextSharp -ImgPathList $pdfFiles -Password "SecurePassword" -ITextSharpPath "C:\path\to\itextsharp.dll"
88
  #>
89

90
  param (
91
    [array]$ImgPathList,
92
    [string]$Password,
93
    [string]$ITextSharpPath
94
  )
95

96
  # Get image files to add into PDF.
97
  foreach ($path in $imgPathList) {
98
    Write-Output $path;
99
    Write-Output $path.GetType().FullName;
100
    Write-Output $path.FullName.GetType().FullName;
101

102
    $ext = ".pdf"
103
    $outputPath = $path.FullName.Replace($ext, "_encrypted{0}" -f $ext)
104
    Encrypt-PdfWithITextSharp -InputPath $path -OutputPath $outputPath -Password $Password -ITextSharpPath $iTextFilePath;
105
  }
106
}
107

108
$targetFolder = (Get-Location).Path;
109
$imgPathList = Get-ChildItem $targetFolder -Recurse -File -Include *.pdf -Exclude PDFsharp*;
110
$password = Read-Host "Input password for encrypted PDF......";
111
$iTextFilePath = "{0}\lib\itextsharp.dll" -f $targetFolder;
112

113
Encrypt-MultiPdfWithITextSharp -ImgPathList $imgPathList -Password $password -ITextSharpPath $iTextFilePath;
114

115
$tmp = Read-Host "Input 'y' to terminate this process......";