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关于ASP,ASP.NET,VB.NET里的MD5加密函数 在ASP中,我们使用过如动网论坛等用的ASP中MD5函数加密出的字符串则如:
1165d25d8cd021d5
而在Asp.Net中下面的方法: 代码
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究其原因,是因为,在ASP中的MD5函数是使用了32位MD5 Hashvalue中的第9~25位再变小写作为密文。知道这个原因,把ASP.NET的结果稍加处理就可以用来比较老数据库中的密码字串了。
在ASP的MD5函数中第353、354行: 代码´MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
MD5=LCase(WordToHex(b) & WordToHex(c)) ´I crop this to fit 16byte database password :D
第一句是取全部的32位密文,第二句则是取中间第9~25位为16位密文。
到了vb.net问题又来了,在vb.net里,无法用到System.Web.Security名称空间,无法用上面简单的办法进行MD5加密。故我写了下面这个函数来处理:
VB.NET: 代码´MD5 加密函数
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原文链接:http://dev.poptool.net/asp/2005-11-22/0511221855.html