Windows Mobile下实现文件加密的示例代码与技术解答

本示例演示如何在Windows Mobile环境下实现文件加密功能，采用AES加密算法保护用户数据隐私。通过该示例，开发者可以了解在移动设备上如何利用.NET Compact Framework实现简单而强大的文件加密。

using System;
using System.IO;
using System.Security.Cryptography;

class FileEncryptor
{
    static void Main()
    {
        string filePath = "sample.txt";
        string encryptedFilePath = "sample_encrypted.txt";

        // 生成随机AES密钥和初始化向量
        using (Aes aesAlg = Aes.Create())
        {
            // 设置密钥和向量，这里应该存储起来以便后续解密
            byte[] key = aesAlg.Key;
            byte[] iv = aesAlg.IV;

            // 加密文件
            EncryptFile(filePath, encryptedFilePath, key, iv);

            // 解密文件
            DecryptFile(encryptedFilePath, "sample_decrypted.txt", key, iv);
        }
    }

    static void EncryptFile(string inputFile, string outputFile, byte[] key, byte[] iv)
    {
        using (Aes aesAlg = Aes.Create())
        {
            aesAlg.Key = key;
            aesAlg.IV = iv;

            // 创建加密流
            using (ICryptoTransform encryptor = aesAlg.CreateEncryptor())
            {
                using (FileStream fsInput = new FileStream(inputFile, FileMode.Open, FileAccess.Read))
                {
                    using (FileStream fsOutput = new FileStream(outputFile, FileMode.Create, FileAccess.Write))
                    {
                        using (CryptoStream cs = new CryptoStream(fsOutput, encryptor, CryptoStreamMode.Write))
                        {
                            // 从输入文件读取明文，经过加密后写入输出文件
                            int data;
                            while ((data = fsInput.ReadByte()) != -1)
                            {
                                cs.WriteByte((byte)data);
                            }
                        }
                    }
                }
            }
        }
    }

    static void DecryptFile(string inputFile, string outputFile, byte[] key, byte[] iv)
    {
        using (Aes aesAlg = Aes.Create())
        {
            aesAlg.Key = key;
            aesAlg.IV = iv;

            // 创建解密流
            using (ICryptoTransform decryptor = aesAlg.CreateDecryptor())
            {
                using (FileStream fsInput = new FileStream(inputFile, FileMode.Open, FileAccess.Read))
                {
                    using (FileStream fsOutput = new FileStream(outputFile, FileMode.Create, FileAccess.Write))
                    {
                        using (CryptoStream cs = new CryptoStream(fsOutput, decryptor, CryptoStreamMode.Write))
                        {
                            // 从输入文件读取密文，经过解密后写入输出文件
                            int data;
                            while ((data = fsInput.ReadByte()) != -1)
                            {
                                cs.WriteByte((byte)data);
                            }
                        }
                    }
                }
            }
        }
    }
}

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