How Can I Easily Implement AES Encryption and Decryption in C#?

AES encryption in C#: Concise Guide

In the field of cryptography, advanced encryption standards (AES) are a powerful and widely accepted algorithm for protecting sensitive data. However, understanding and implementing AES encryption in a programming language such as C# seems to be a difficult task.

rijndaelmanaged: built -in provider

Fortunately, the .NET framework provided an easy -to -use AES encryption implementation through the Rijndaelmanaged class. This provides a simplified way to process the complexity of AES encryption and decryption.

The example code of encryption and secret

In order to explain the working principle of Rijndaelmanaged, let's see a concise code example:

Summary

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

namespace AES加密示例
{
    class Program
    {
        static void Main(string[] args)
        {
            // 要加密的原始数据
            string original = "机密信息";

            // 生成新的密钥和初始化向量 (IV)
            using (RijndaelManaged rijndael = new RijndaelManaged())
            {
                rijndael.GenerateKey();
                rijndael.GenerateIV();

                // 加密
                byte[] encryptedBytes = EncryptStringToBytes(original, rijndael.Key, rijndael.IV);

                // 解密
                string decryptedString = DecryptStringFromBytes(encryptedBytes, rijndael.Key, rijndael.IV);

                // 显示结果
                Console.WriteLine("原始数据：{0}", original);
                Console.WriteLine("加密后：{0}", Convert.ToBase64String(encryptedBytes));
                Console.WriteLine("解密后：{0}", decryptedString);
            }
        }

        static byte[] EncryptStringToBytes(string plainText, byte[] key, byte[] iv)
        {
            using (RijndaelManaged rijndael = new RijndaelManaged())
            {
                rijndael.Key = key;
                rijndael.IV = iv;

                using (ICryptoTransform encryptor = rijndael.CreateEncryptor())
                using (MemoryStream msEncrypt = new MemoryStream())
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                {
                    swEncrypt.Write(plainText);
                    return msEncrypt.ToArray();
                }
            }
        }

        static string DecryptStringFromBytes(byte[] encryptedBytes, byte[] key, byte[] iv)
        {
            using (RijndaelManaged rijndael = new RijndaelManaged())
            {
                rijndael.Key = key;
                rijndael.IV = iv;

                using (ICryptoTransform decryptor = rijndael.CreateDecryptor())
                using (MemoryStream msDecrypt = new MemoryStream(encryptedBytes))
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                {
                    return srDecrypt.ReadToEnd();
                }
            }
        }
    }
}

By using the RijndaelmanageD class, developers can easily implement AES encryption and decryption in the C# application. The provided example code provides a solid foundation for understanding the basic concepts and building a security encryption solution. A subtle adjustment in the code is also made. For example, the USING statement is used to ensure the correct release of the resource, and the variable name is clearer. In addition, replace the original string "Confidential Information" to "confidential information" to make it more in line with Chinese context.

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