如何在.NET中加密字符串？

我必须加密/解密Xml文件中的一些敏感信息？ 是的我可以通过编写自己的自定义算法来做到这一点。 我想知道在.NET中是否已经有一种内置方式可以做到这一点以及我总是需要注意哪些方面……

Answer 1

这里有几个使用.NET框架加密和解密字符串的函数：

public string EncryptString(string plainText) { // Instantiate a new RijndaelManaged object to perform string symmetric encryption RijndaelManaged rijndaelCipher = new RijndaelManaged(); // Set key and IV rijndaelCipher.Key = Convert.FromBase64String("ABC"); rijndaelCipher.IV = Convert.FromBase64String("123"); // Instantiate a new MemoryStream object to contain the encrypted bytes MemoryStream memoryStream = new MemoryStream(); // Instantiate a new encryptor from our RijndaelManaged object ICryptoTransform rijndaelEncryptor = rijndaelCipher.CreateEncryptor(); // Instantiate a new CryptoStream object to process the data and write it to the // memory stream CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelEncryptor, CryptoStreamMode.Write); // Convert the plainText string into a byte array byte[] plainBytes = Encoding.ASCII.GetBytes(plainText); // Encrypt the input plaintext string cryptoStream.Write(plainBytes, 0, plainBytes.Length); // Complete the encryption process cryptoStream.FlushFinalBlock(); // Convert the encrypted data from a MemoryStream to a byte array byte[] cipherBytes = memoryStream.ToArray(); // Close both the MemoryStream and the CryptoStream memoryStream.Close(); cryptoStream.Close(); // Convert the encrypted byte array to a base64 encoded string string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length); // Return the encrypted data as a string return cipherText; } public string DecryptString(string cipherText) { // Instantiate a new RijndaelManaged object to perform string symmetric encryption RijndaelManaged rijndaelCipher = new RijndaelManaged(); // Set key and IV rijndaelCipher.Key = Convert.FromBase64String("ABC"); rijndaelCipher.IV = Convert.FromBase64String("123"); // Instantiate a new MemoryStream object to contain the encrypted bytes MemoryStream memoryStream = new MemoryStream(); // Instantiate a new encryptor from our RijndaelManaged object ICryptoTransform rijndaelDecryptor = rijndaelCipher.CreateDecryptor(); // Instantiate a new CryptoStream object to process the data and write it to the // memory stream CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelDecryptor, CryptoStreamMode.Write); // Will contain decrypted plaintext string plainText = String.Empty; try { // Convert the ciphertext string into a byte array byte[] cipherBytes = Convert.FromBase64String(cipherText); // Decrypt the input ciphertext string cryptoStream.Write(cipherBytes, 0, cipherBytes.Length); // Complete the decryption process cryptoStream.FlushFinalBlock(); // Convert the decrypted data from a MemoryStream to a byte array byte[] plainBytes = memoryStream.ToArray(); // Convert the encrypted byte array to a base64 encoded string plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length); } finally { // Close both the MemoryStream and the CryptoStream memoryStream.Close(); cryptoStream.Close(); } // Return the encrypted data as a string return plainText; } 

当然我不建议像这样硬编码密钥和初始化向量:)

Answer 2

您可能希望深入了解System.Security.Cryptography命名空间。 我想MSDN上的文章密码学概述 ， 加密数据和解密数据可能是一个好的开端。