C# 加密解密

//// <summary> /// 加密 /// </summary> /// <param name="datastr">要加密的字符串</param> /// <param name="keystr">加密密钥</param> /// <returns>加密后的字符串</returns> public static String Encrypt(String datastr, String keystr) { DESCryptoServiceProvider desc = new DESCryptoServiceProvider(); byte[] key = System.Text.Encoding.ASCII.GetBytes(keystr); byte[] data = System.Text.Encoding.Unicode.GetBytes(datastr); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, desc.CreateEncryptor(key, key), CryptoStreamMode.Write); cs.Write(data, 0, data.Length); cs.FlushFinalBlock(); return System.Convert.ToBase64String(ms.ToArray()); } //// <summary> /// 解密 /// </summary> /// <param name="datastr">要解密的字符串</param> /// <param name="keystr">解密的密钥</param> /// <returns></returns> public static String Decrypt(String datastr, String keystr) { byte[] data = System.Convert.FromBase64String(datastr); DESCryptoServiceProvider desc = new DESCryptoServiceProvider(); byte[] key = System.Text.Encoding.ASCII.GetBytes(keystr); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, desc.CreateDecryptor(key, key), CryptoStreamMode.Write); cs.Write(data, 0, data.Length); cs.FlushFinalBlock(); return System.Text.Encoding.Unicode.GetString(ms.ToArray()); }