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在C#中,可以使用System.Security.Cryptography命名空间下的类来实现字符串的加密和解密。以下是一个使用AES加密和解密的示例:
首先,确保已经安装了System.Security.Cryptography.Aes NuGet包。如果没有安装,可以通过以下命令安装:
dotnet add package System.Security.Cryptography.Aes
然后,可以使用以下代码实现加密和解密:
using System; using System.Text; using System.Security.Cryptography; using System.IO; class AesEncryptionExample { static void Main() { string key = "your-secret-key"; // 密钥应该是16、24或32个字符长度的字符串 string plaintext = "Hello, World!"; // 要加密的字符串 string encrypted = Encrypt(plaintext, key); Console.WriteLine("Encrypted text: " + encrypted); string decrypted = Decrypt(encrypted, key); Console.WriteLine("Decrypted text: " + decrypted); } static string Encrypt(string plaintext, string key) { byte[] iv = new byte[16]; // 初始化向量(IV)长度为16字节(AES-128) byte[] array; using (Aes aes = Aes.Create()) { aes.Key = Encoding.UTF8.GetBytes(key); aes.IV = iv; ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV); using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write)) { using (StreamWriter streamWriter = new StreamWriter(cryptoStream)) { streamWriter.Write(plaintext); } array = memoryStream.ToArray(); } } } return Convert.ToBase64String(array); } static string Decrypt(string ciphertext, string key) { byte[] iv = new byte[16]; // 初始化向量(IV)长度为16字节(AES-128) byte[] array; using (Aes aes = Aes.Create()) { aes.Key = Encoding.UTF8.GetBytes(key); aes.IV = iv; ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV); using (MemoryStream memoryStream = new MemoryStream(Convert.FromBase64String(ciphertext))) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read)) { using (StreamReader streamReader = new StreamReader(cryptoStream)) { array = Encoding.UTF8.GetBytes(streamReader.ReadToEnd()); } } } } return Encoding.UTF8.GetString(array); } }
请注意,这个示例使用了AES-128加密算法。你可以根据需要选择其他加密算法,例如AES-192或AES-256。但是,密钥和IV的长度将相应地变化。例如,对于AES-256,密钥应该是32个字符长度的字符串,IV应该是16字节(AES-128)或24字节(AES-192或AES-256)长度的字符串。