对称加密解密
/// <summary> /// 帮助类 /// </summary> public class CryptoHelper { //// 对称加密算法提供器 /// <summary> /// 加密器对象 /// </summary> private readonly ICryptoTransform encryptor; /// <summary> /// 解密器对象 /// </summary> private readonly ICryptoTransform decryptor; /// <summary> /// 缓存 /// </summary> private const int BufferSize = 1024; /// <summary> /// Initializes a new instance of the <see cref="CryptoHelper"/> class. /// </summary> /// <param name="algorithmName"> /// algorithmName /// </param> /// <param name="key"> /// 密钥 /// </param> public CryptoHelper(string algorithmName, string key) { SymmetricAlgorithm _provider = SymmetricAlgorithm.Create(algorithmName); _provider.Key = Encoding.UTF8.GetBytes(key); _provider.IV = new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; encryptor = _provider.CreateEncryptor(); decryptor = _provider.CreateDecryptor(); } /// <summary> /// Initializes a new instance of the <see cref="CryptoHelper"/> class. /// </summary> /// <param name="key"> /// 密钥 /// </param> public CryptoHelper(string key) : this("TripleDES", key) { } /// <summary> /// 加密算法 /// </summary> /// <param name="clearText"> /// The clear text. /// </param> /// <returns> /// 密文 /// </returns> public string Encrypt(string clearText) { //// 创建明文流 byte[] _clearBuffer = Encoding.UTF8.GetBytes(clearText); var _clearStream = new MemoryStream(_clearBuffer); //// 创建空的密文流 var _encryptedStream = new MemoryStream(); var _cryptoStream = new CryptoStream(_encryptedStream, encryptor, CryptoStreamMode.Write); //// 将明文流写入到buffer中 //// 将buffer中的数据写入到cryptoStream中 int _bytesRead; var _buffer = new byte[BufferSize]; do { _bytesRead = _clearStream.Read(_buffer, 0, BufferSize); _cryptoStream.Write(_buffer, 0, _bytesRead); } while (_bytesRead > 0); _cryptoStream.FlushFinalBlock(); //// 获取加密后的文本 _buffer = _encryptedStream.ToArray(); string _encryptedText = Convert.ToBase64String(_buffer); return _encryptedText; } /// <summary> /// 解密算法 /// </summary> /// <param name="encryptedText"> /// The encrypted text. /// </param> /// <returns> /// 解密字符串 /// </returns> public string Decrypt(string encryptedText) { byte[] _encryptedBuffer = Convert.FromBase64String(encryptedText); Stream _encryptedStream = new MemoryStream(_encryptedBuffer); var _clearStream = new MemoryStream(); var _cryptoStream = new CryptoStream(_encryptedStream, decryptor, CryptoStreamMode.Read); int _bytesRead; var _buffer = new byte[BufferSize]; do { _bytesRead = _cryptoStream.Read(_buffer, 0, BufferSize); _clearStream.Write(_buffer, 0, _bytesRead); } while (_bytesRead > 0); _buffer = _clearStream.GetBuffer(); string _clearText = Encoding.UTF8.GetString(_buffer, 0, (int) _clearStream.Length); return _clearText; } /// <summary> /// 加密 /// </summary> /// <param name="clearText"> /// 连接字符串 /// </param> /// <param name="key"> /// 密钥 /// </param> /// <returns> /// 加密后的字符串 /// </returns> public static string Encrypt(string clearText, string key) { var _helper = new CryptoHelper(key); return _helper.Encrypt(clearText); } /// <summary> /// 解密 /// </summary> /// <param name="encryptedText"> /// 连接字符串 /// </param> /// <param name="key"> /// 密钥 /// </param> /// <returns> /// 解密后的字符串 /// </returns> public static string Decrypt(string encryptedText, string key) { var _helper = new CryptoHelper(key); return _helper.Decrypt(encryptedText); } }