public void TestLongClearText()
{
string clear = @"
Introduction
There are many, many examples of how to do encryption and decryption in .NET. So why one more? Well, for one thing, I find that the majority of good code examples of any type are issued in C#. This isn't surprising, since those from a C++ or Java background will have an easier transition to C# than a similarly experienced Visual Basic developer moving to VB.NET. It will take time for the VB.NET community to develop into what the C++ and Java community already has at its disposal. So, I thought that a solid, simple VB.NET example would do well.
Overview
This code example does four things that I think are missing from the examples that I have seen so far:
It's written in Visual Basic .NET. Not that it is in any way superior or inferior to C#, but most of the other examples (and all of the good ones) were done in C#.
It uses the UTF-8 encoder to ensure that the strings which are encrypted or decrypted are in an 8-bit format. Many examples that I see use the ASCII encoding, which is a 7-bit format. When you combine this with TripleDES (which uses 3, 8-bit blocks for the key), you can get yourself into situations where you cannot decrypt something you encrypted.
It uses the Convert object's Base-64 methods to make sure that the encrypted text is output in such a way that it can be easily stored in text files and/or database fields without the risk of your encrypted content being inadvertently modified by implicit conversions.
It centralizes the actual encryption and decryption functionality into a single method, thus eliminating what would otherwise be 99% redundant code.
玩转手机目前支持支持诺基亚、摩托罗拉、索尼爱立信、三星、LG等著名手机品牌的400多个型号的手机。此外，奇点软件目前为众多手机厂商提供“玩转手机”OEM版本。由于利用了插件技术，OEM版本可以支持一个手机厂商的所有型号的手机，而不论这些型号的手机是自研开发还是外包开发，或者手机端采用什么样的通信协议，这样一来没有必要在网站或随机光盘里面放各种不同版本的PC同步软件。
这对手机厂商带来很多好处，比如没有必要在网站或随机光盘里面放各种不同版本的PC同步软件，而让用户花上很长时间找到适合自己手机的版本。用户感到便利的同时也大大提高了厂商在其心目中的形象；对于厂商自己而言，售后服务人员只需要熟悉一套软件就可以提供售后服务，降低了售后服务的成本；同时管理一个版本相比管理很多版本要容易很多，这也就降低了软件版本的管理成本。
目前采用玩转手机“OEM”版本的客户有：华为、海尔、宇龙、UT、联想、康佳、TCL&Alcatel、波导、金立、东信、首信、佳通、IVT、滚石移动；合作伙伴有德信无线、深圳赛龙、SkyWorks、科泰世纪。
";
string key = "Long text key.";
TripleDESService des = new TripleDESService();
Assert.AreEqual(clear, des.Decrypt(key, des.Encrypt(key, clear)));
}
public void TestLongKey()
{
string clear = "This test case will test long key.";
string key = "abcdefghijklmnopqrstuvwxyz";
TripleDESService des = new TripleDESService();
string encrypted = des.Encrypt(key, clear);
string decrypted = des.Decrypt(key, encrypted);
Assert.AreEqual(clear, decrypted);
}
public void TestEncryptAndDecrypt()
{
string clear = "This is the clear text.\r\nIt includes new lines\r\n中文明文测试";
string key = "Here is the private key";
TripleDESService des = new TripleDESService();
string encrypted = des.Encrypt(key, clear);
string decrypted = des.Decrypt(key, encrypted);
Console.Out.WriteLine("Encrypted: " + encrypted);
Console.Out.WriteLine("Decrypted: " + decrypted);
Assert.AreEqual(clear, decrypted);
}