使用 C# 受密码保护的 PDF
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Password protected PDF using C#
提问by balaweblog
I am creating a pdf document using C# code in my process. I need to protect the docuemnt with some standard password like "123456" or some account number. I need to do this without any reference dlls like pdf writer.
我正在我的过程中使用 C# 代码创建一个 pdf 文档。我需要使用一些标准密码（如“123456”或一些帐号）来保护文档。我需要在没有任何参考 dll 的情况下执行此操作，例如 pdf writer。
I am generating the PDF file using SQL Reporting services reports.
我正在使用 SQL Reporting Services 报告生成 PDF 文件。
Is there are easiest way.
有没有最简单的方法。
采纳答案by Darin Dimitrov
I am creating a pdf document using C# code in my process
我正在我的过程中使用 C# 代码创建一个 pdf 文档
Are you using some library to create this document? The pdf specification(8.6MB) is quite big and all tasks involving pdf manipulation could be difficult without using a third party library. Password protecting and encrypting your pdf files with the free and open source itextsharplibrary is quite easy:
您是否使用某个库来创建此文档？在PDF规范（8.6MB）是相当大的，涉及操作PDF的所有任务，可以在不使用第三方库是困难的。使用免费和开源的itextsharp库密码保护和加密您的 pdf 文件非常简单：
using (Stream input = new FileStream("test.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))
using (Stream output = new FileStream("test_encrypted.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
{
PdfReader reader = new PdfReader(input);
PdfEncryptor.Encrypt(reader, output, true, "secret", "secret", PdfWriter.ALLOW_PRINTING);
}
回答by Bobrovsky
It would be very difficult to do this without using a PDF library. Basically, you'll need to develop such library yourselves.
如果不使用 PDF 库，就很难做到这一点。基本上，您需要自己开发这样的库。
With help of a PDF library everything is much simpler. Here is a sample that shows how a document can easily be protected using Docotic.Pdf library:
在 PDF 库的帮助下，一切都变得简单多了。这是一个示例，展示了如何使用Docotic.Pdf 库轻松保护文档：
public static void protectWithPassword(string input, string output)
{
using (PdfDocument doc = new PdfDocument(input))
{
// set owner password (a password required to change permissions)
doc.OwnerPassword = "pass";
// set empty user password (this will allow anyone to
// view document without need to enter password)
doc.UserPassword = "";
// setup encryption algorithm
doc.Encryption = PdfEncryptionAlgorithm.Aes128Bit;
// [optionally] setup permissions
doc.Permissions.CopyContents = false;
doc.Permissions.ExtractContents = false;
doc.Save(output);
}
}
Disclaimer: I work for the vendor of the library.
免责声明：我为图书馆的供应商工作。
回答by horseman1210
If anyone is looking for a IText7 reference.
如果有人正在寻找 IText7 参考。
private string password = "@d45235fewf";
private const string pdfFile = @"C:\Temp\Old.pdf";
private const string pdfFileOut = @"C:\Temp\New.pdf";
public void DecryptPdf()
{
//Set reader properties and password
ReaderProperties rp = new ReaderProperties();
rp.SetPassword(new System.Text.UTF8Encoding().GetBytes(password));
//Read the PDF and write to new pdf
using (PdfReader reader = new PdfReader(pdfFile, rp))
{
reader.SetUnethicalReading(true);
PdfDocument pdf = new PdfDocument(reader, new PdfWriter(pdfFileOut));
pdf.GetFirstPage(); // Get at the very least the first page
}
}
