C#对称加密怎样快速入门

要快速入门C#对称加密，你可以使用.NET Framework中的System.Security.Cryptography命名空间提供的类来实现。以下是一个简单的示例代码，演示如何使用AES算法进行对称加密和解密：

using System;using System.Security.Cryptography;using System.Text;class Program{    static void Main()    {        string plainText = "Hello, world!";        string key = "0123456789abcdef"; // 16字节的AES密钥        string iv = "abcdef9876543210"; // 16字节的初始化向量        byte[] encryptedBytes = EncryptStringToBytes_Aes(plainText, key, iv);        string decryptedText = DecryptStringFromBytes_Aes(encryptedBytes, key, iv);        Console.WriteLine("Encrypted: " + Convert.ToBase64String(encryptedBytes));        Console.WriteLine("Decrypted: " + decryptedText);    }    static byte[] EncryptStringToBytes_Aes(string plainText, string key, string iv)    {        byte[] encrypted;        using (Aes aesAlg = Aes.Create())        {            aesAlg.Key = Encoding.UTF8.GetBytes(key);            aesAlg.IV = Encoding.UTF8.GetBytes(iv);            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);            using (MemoryStream msEncrypt = new MemoryStream())            {                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))                {                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))                    {                        swEncrypt.Write(plainText);                    }                    encrypted = msEncrypt.ToArray();                }            }        }        return encrypted;    }    static string DecryptStringFromBytes_Aes(byte[] cipherText, string key, string iv)    {        string plaintext = null;        using (Aes aesAlg = Aes.Create())        {            aesAlg.Key = Encoding.UTF8.GetBytes(key);            aesAlg.IV = Encoding.UTF8.GetBytes(iv);            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);            using (MemoryStream msDecrypt = new MemoryStream(cipherText))            {                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))                {                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))                    {                        plaintext = srDecrypt.ReadToEnd();                    }                }            }        }        return plaintext;    }}

在这个示例中，我们使用了AES算法来加密和解密字符串。你可以根据自己的需求调整密钥和初始化向量的长度，并根据具体情况选择其他对称加密算法。希望这能帮助你快速入门C#对称加密。