在C#中，你可以使用Windows的加密API来加密和解密SQLite数据库文件。以下是一个简单的例子，展示了如何使用BCrypt进行加密和解密：
首先，你需要安装System.Security.Cryptography.Algorithms NuGet包。
using System;
using System.IO;
using System.Security.Cryptography;
public class SQLiteEncrypter
{
private readonly string _encryptionKey;
public SQLiteEncrypter(string encryptionKey)
{
_encryptionKey = encryptionKey;
}
public void EncryptDatabase(string inputFilePath, string outputFilePath)
{
using (Aes aes = Aes.Create())
{
aes.Key = Encoding.UTF8.GetBytes(_encryptionKey);
aes.GenerateIV();
using (FileStream fsIn = new FileStream(inputFilePath, FileMode.Open))
using (FileStream fsOut = new FileStream(outputFilePath, FileMode.Create))
using (CryptoStream cs = new CryptoStream(fsOut, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
fsIn.CopyTo(cs);
fsOut.FlushFinalBlock();
// Save the IV and the ciphertext to the output file
byte[] iv = aes.IV;
byte[] ciphertext = fsOut.ToArray();
byte[] combined = CombineArrays(iv, ciphertext);
// Write the IV and the ciphertext to the output file
fsOut.Seek(0, SeekOrigin.Begin);
fsOut.Write(combined, 0, combined.Length);
}
}
}
public void DecryptDatabase(string inputFilePath, string outputFilePath)
{
using (Aes aes = Aes.Create())
{
aes.Key = Encoding.UTF8.GetBytes(_encryptionKey);
using (FileStream fsIn = new FileStream(inputFilePath, FileMode.Open))
using (FileStream fsOut = new FileStream(outputFilePath, FileMode.Create))
using (CryptoStream cs = new CryptoStream(fsOut, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
byte[] buffer = new byte[1024];
int read;
// Read t