现在网上的DES加密算法大都有问题，有幸在BBS上找到一个，但接口不够好。下面这一个是用MFC的CSTRING封装了一次的。
下面这两个是关键
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CString SEncrypt(CString);
CString SDecrypt(CString);
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int main()
{
CString aa,bb,cc;
aa = "kingwind";
unsigned long s1,s2;
s1 = 30;
s2 = 100;

    CPackage_Encoder coder1,coder2;

    const char k1[256]="dsa3425Hello";
coder1.SetKey(k1);
coder2.SetKey(k1);

cout<<"明文："<<aa<<endl;

bb = coder1.SEncrypt(aa);
cout<<"密文："<<bb<<endl;

cc = coder2.SDecrypt(bb);
cout<<"明文："<<cc<<endl;

    return 0;
};