BouncyCastle C#（開發者的工作原理）

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using System.Text;

public class SimpleEncryption
{
    /// <summary>
    /// Encrypts data using AES encryption with a given password.
    /// </summary>
    /// <param name="message">The message to encrypt.</param>
    /// <param name="password">The password for key derivation.</param>
    /// <returns>The encrypted message as a byte array.</returns>
    public static byte[] EncryptData(string message, string password)
    {
        // Generate a random salt
        var salt = new byte[8];
        new SecureRandom().NextBytes(salt);

        // Derive key and IV from the password and salt
        Pkcs5S2ParametersGenerator generator = new Pkcs5S2ParametersGenerator();
        generator.Init(PbeParametersGenerator.Pkcs5PasswordToBytes(password.ToCharArray()), salt, 1000);
        ParametersWithIV keyParam = (ParametersWithIV)generator.GenerateDerivedMacParameters(256 + 128);

        // Create AES cipher in CBC mode with PKCS7 padding
        var cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesEngine()));
        cipher.Init(true, keyParam);

        // Convert message to byte array and encrypt
        byte[] inputBytes = Encoding.UTF8.GetBytes(message);
        byte[] outputBytes = new byte[cipher.GetOutputSize(inputBytes.Length)];
        int length = cipher.ProcessBytes(inputBytes, 0, inputBytes.Length, outputBytes, 0);
        cipher.DoFinal(outputBytes, length);

        return outputBytes;
    }
}

Imports Org.BouncyCastle.Crypto
Imports Org.BouncyCastle.Crypto.Engines
Imports Org.BouncyCastle.Crypto.Generators
Imports Org.BouncyCastle.Crypto.Modes
Imports Org.BouncyCastle.Crypto.Parameters
Imports Org.BouncyCastle.Security
Imports System.Text

Public Class SimpleEncryption
	''' <summary>
	''' Encrypts data using AES encryption with a given password.
	''' </summary>
	''' <param name="message">The message to encrypt.</param>
	''' <param name="password">The password for key derivation.</param>
	''' <returns>The encrypted message as a byte array.</returns>
	Public Shared Function EncryptData(ByVal message As String, ByVal password As String) As Byte()
		' Generate a random salt
		Dim salt = New Byte(7){}
		Call (New SecureRandom()).NextBytes(salt)

		' Derive key and IV from the password and salt
		Dim generator As New Pkcs5S2ParametersGenerator()
		generator.Init(PbeParametersGenerator.Pkcs5PasswordToBytes(password.ToCharArray()), salt, 1000)
		Dim keyParam As ParametersWithIV = CType(generator.GenerateDerivedMacParameters(256 + 128), ParametersWithIV)

		' Create AES cipher in CBC mode with PKCS7 padding
		Dim cipher = New PaddedBufferedBlockCipher(New CbcBlockCipher(New AesEngine()))
		cipher.Init(True, keyParam)

		' Convert message to byte array and encrypt
		Dim inputBytes() As Byte = Encoding.UTF8.GetBytes(message)
		Dim outputBytes(cipher.GetOutputSize(inputBytes.Length) - 1) As Byte
		Dim length As Integer = cipher.ProcessBytes(inputBytes, 0, inputBytes.Length, outputBytes, 0)
		cipher.DoFinal(outputBytes, length)

		Return outputBytes
	End Function
End Class

string message = "Hello, this is a test message!";
string password = "StrongPassword123";
byte[] encryptedMessage = SimpleEncryption.EncryptData(message, password);
Console.WriteLine("Original Message: " + message);
Console.WriteLine("Encrypted Message: " + BitConverter.ToString(encryptedMessage));

Dim message As String = "Hello, this is a test message!"
Dim password As String = "StrongPassword123"
Dim encryptedMessage() As Byte = SimpleEncryption.EncryptData(message, password)
Console.WriteLine("Original Message: " & message)
Console.WriteLine("Encrypted Message: " & BitConverter.ToString(encryptedMessage))

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 1. Convert HTML String to PDF
        var htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>";
        var pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 2. Convert HTML File to PDF
        var htmlFilePath = "path_to_your_html_file.html"; // Specify the path to your HTML file
        var pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

        // 3. Convert URL to PDF
        var url = "http://ironpdf.com"; // Specify the URL
        var pdfFromUrl = renderer.RenderUrlAsPdf(url);
        pdfFromUrl.SaveAs("URLToPDF.pdf");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 1. Convert HTML String to PDF
		Dim htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>"
		Dim pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 2. Convert HTML File to PDF
		Dim htmlFilePath = "path_to_your_html_file.html" ' Specify the path to your HTML file
		Dim pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

		' 3. Convert URL to PDF
		Dim url = "http://ironpdf.com" ' Specify the URL
		Dim pdfFromUrl = renderer.RenderUrlAsPdf(url)
		pdfFromUrl.SaveAs("URLToPDF.pdf")
	End Sub
End Class

using IronPdf;

public class PdfGenerator
{
    /// <summary>
    /// Creates a simple PDF from HTML content.
    /// </summary>
    /// <param name="filePath">The file path to save the PDF.</param>
    /// <param name="content">The HTML content to render as PDF.</param>
    public static void CreateSimplePdf(string filePath, string content)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf(content);
        pdf.SaveAs(filePath);
    }
}

Imports IronPdf

Public Class PdfGenerator
	''' <summary>
	''' Creates a simple PDF from HTML content.
	''' </summary>
	''' <param name="filePath">The file path to save the PDF.</param>
	''' <param name="content">The HTML content to render as PDF.</param>
	Public Shared Sub CreateSimplePdf(ByVal filePath As String, ByVal content As String)
		Dim renderer = New ChromePdfRenderer()
		Dim pdf = renderer.RenderHtmlAsPdf(content)
		pdf.SaveAs(filePath)
	End Sub
End Class

using System.IO;
using System.Text;

// ... [Previous Bouncy Castle using statements]

public class PdfEncryption
{
    /// <summary>
    /// Encrypts a PDF file using AES encryption.
    /// </summary>
    /// <param name="inputFilePath">The path to the input PDF file.</param>
    /// <param name="outputFilePath">The path to save the encrypted PDF file.</param>
    /// <param name="password">The password used for encryption.</param>
    public static void EncryptPdfFile(string inputFilePath, string outputFilePath, string password)
    {
        // Read the PDF file
        byte[] pdfBytes = File.ReadAllBytes(inputFilePath);

        // Encrypt the PDF bytes
        byte[] encryptedBytes = SimpleEncryption.EncryptData(Encoding.UTF8.GetString(pdfBytes), password);

        // Write the encrypted bytes to a new file
        File.WriteAllBytes(outputFilePath, encryptedBytes);
    }
}

Imports System.IO
Imports System.Text

' ... [Previous Bouncy Castle using statements]

Public Class PdfEncryption
	''' <summary>
	''' Encrypts a PDF file using AES encryption.
	''' </summary>
	''' <param name="inputFilePath">The path to the input PDF file.</param>
	''' <param name="outputFilePath">The path to save the encrypted PDF file.</param>
	''' <param name="password">The password used for encryption.</param>
	Public Shared Sub EncryptPdfFile(ByVal inputFilePath As String, ByVal outputFilePath As String, ByVal password As String)
		' Read the PDF file
		Dim pdfBytes() As Byte = File.ReadAllBytes(inputFilePath)

		' Encrypt the PDF bytes
		Dim encryptedBytes() As Byte = SimpleEncryption.EncryptData(Encoding.UTF8.GetString(pdfBytes), password)

		' Write the encrypted bytes to a new file
		File.WriteAllBytes(outputFilePath, encryptedBytes)
	End Sub
End Class