/// <summary>
/// 把字符串加密（可以进行解密），并且把加密结果转换为base64编码.
/// </summary>
/// <param name="rawString">需要加密的数据</param>
/// <param name="passwordString">用来加密的密钥</param>
/// <returns></returns>
public static string EncryptByTriple(string rawString, string passwordString)
{
byte[] passwordBytes = EncodingUtility.ToBytesFromUnicode(passwordString);
byte[] passwordMd5Bytes = ComputeHashByMD5(passwordBytes);
return(EncryptByTriple(rawString, DefaultEncoding, passwordMd5Bytes, passwordMd5Bytes));
}