此处的其他答案很好用，但是AES是一种更安全和最新的加密算法。这是我几年前获得的用于执行AES加密的类，随着时间的推移，我对它进行了修改以使其对Web应用程序更加友好（例如，我已经构建了可与URL友好的字符串一起使用的Encrypt
/ Decrypt方法）。它还具有使用字节数组的方法。
注意：您应该在Key（32个字节）和Vector（16个字节）数组中使用不同的值！您不希望有人仅仅假设您按原样使用此代码来弄清楚您的密钥！您所要做的就是更改Key和Vector数组中的一些数字（必须为<=
255）（我在Vector数组中留下了一个无效值，以确保您执行此操作…）。您可以使用https://www.random.org/bytes/轻松生成一个新集合：
- 生成
Key
- 生成
Vector
使用它很容易：只需实例化该类，然后（通常）将EncryptToString（string
StringToEncrypt）和DecryptString（string
StringToDecrypt）调用为方法。设置好此类后，再简单不过了（或更安全）。
using System;using System.Data;using System.Security.Cryptography;using System.IO;public class SimpleAES{ // Change these keys private byte[] Key = __Replace_Me__({ 123, 217, 19, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 112, 222, 209, 241, 24, 175, 144, 173, 53, 196, 29, 24, 26, 17, 218, 131, 236, 53, 209 }); // a hardpred IV should not be used for production AES-CBC pre // IVs should be unpredictable per ciphertext private byte[] Vector = __Replace_Me__({ 146, 64, 191, 111, 23, 3, 113, 119, 231, 121, 2521, 112, 79, 32, 114, 156 }); private ICryptoTransform EncryptorTransform, DecryptorTransform; private System.Text.UTF8Encoding UTFEnprer; public SimpleAES() { //This is our encryption method RijndaelManaged rm = new RijndaelManaged(); //Create an encryptor and a decryptor using our encryption method, key, and vector. EncryptorTransform = rm.CreateEncryptor(this.Key, this.Vector); DecryptorTransform = rm.CreateDecryptor(this.Key, this.Vector); //Used to translate bytes to text and vice versa UTFEnprer = new System.Text.UTF8Encoding(); } /// -------------- Two Utility Methods (not used but may be useful) ----------- /// Generates an encryption key. static public byte[] GenerateEncryptionKey() { //Generate a Key. RijndaelManaged rm = new RijndaelManaged(); rm.GenerateKey(); return rm.Key; } /// Generates a unique encryption vector static public byte[] GenerateEncryptionVector() { //Generate a Vector RijndaelManaged rm = new RijndaelManaged(); rm.GenerateIV(); return rm.IV; } /// ----------- The commonly used methods ------------------------------ /// Encrypt some text and return a string suitable for passing in a URL. public string EncryptToString(string TextValue) { return ByteArrToString(Encrypt(TextValue)); } /// Encrypt some text and return an encrypted byte array. public byte[] Encrypt(string TextValue) { //Translates our text value into a byte array. Byte[] bytes = UTFEnprer.GetBytes(TextValue); //Used to stream the data in and out of the CryptoStream. MemoryStream memoryStream = new MemoryStream(); #region Write the decrypted value to the encryption stream CryptoStream cs = new CryptoStream(memoryStream, EncryptorTransform, CryptoStreamMode.Write); cs.Write(bytes, 0, bytes.Length); cs.FlushFinalBlock(); #endregion #region Read encrypted value back out of the stream memoryStream.Position = 0; byte[] encrypted = new byte[memoryStream.Length]; memoryStream.Read(encrypted, 0, encrypted.Length); #endregion //Clean up. cs.Close(); memoryStream.Close(); return encrypted; } /// The other side: Decryption methods public string DecryptString(string EncryptedString) { return Decrypt(StrToByteArray(EncryptedString)); } /// Decryption when working with byte arrays. public string Decrypt(byte[] EncryptedValue) { #region Write the encrypted value to the decryption stream MemoryStream encryptedStream = new MemoryStream(); CryptoStream decryptStream = new CryptoStream(encryptedStream, DecryptorTransform, CryptoStreamMode.Write); decryptStream.Write(EncryptedValue, 0, EncryptedValue.Length); decryptStream.FlushFinalBlock(); #endregion #region Read the decrypted value from the stream. encryptedStream.Position = 0; Byte[] decryptedBytes = new Byte[encryptedStream.Length]; encryptedStream.Read(decryptedBytes, 0, decryptedBytes.Length); encryptedStream.Close(); #endregion return UTFEnprer.GetString(decryptedBytes); } /// Convert a string to a byte array. NOTE: Normally we'd create a Byte Array from a string using an ASCII encoding (like so). // System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); // return encoding.GetBytes(str); // However, this results in character values that cannot be passed in a URL. So, instead, I just // lay out all of the byte values in a long string of numbers (three per - must pad numbers less than 100). public byte[] StrToByteArray(string str) { if (str.Length == 0) throw new Exception("Invalid string value in StrToByteArray"); byte val; byte[] byteArr = new byte[str.Length / 3]; int i = 0; int j = 0; do { val = byte.Parse(str.Substring(i, 3)); byteArr[j++] = val; i += 3; } while (i < str.Length); return byteArr; } // Same comment as above. Normally the conversion would use an ASCII encoding in the other direction: // System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding(); // return enc.GetString(byteArr); public string ByteArrToString(byte[] byteArr) { byte val; string tempStr = ""; for (int i = 0; i <= byteArr.GetUpperBound(0); i++) { val = byteArr[i]; if (val < (byte)10) tempStr += "00" + val.ToString(); else if (val < (byte)100) tempStr += "0" + val.ToString(); else tempStr += val.ToString(); } return tempStr; }}
