Validating Facebook Cookie Using Md5 Hash?
Sep 4, 2010
I am trying to incorporate facebook login in my ASP.NET web app and came across the following article which has a code sample for the same.
[URL]
The following is from the article.
Next, and most importantly, the class validates the cookie. This validation uses MD5 hashing to compare the contents of key appended to the app secret to the signature that comes in with the cookie. If these values match we know the key is valid.we know the key is valid.
Why is Md5 hashing being used for that? Why not SHA or some other algo?
What happens if I don't validate the cookie? Can invalid cookies be sent to the server?
In the article, he throws a new security exception if cookie is invalid? What should the user do in such a case?
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{
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[code]....
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[Code]....
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Using sha As New SHA256Managed
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End Using
End Using
I have been unable to recreate the same hash for the same values with these two bits of code.
The javascript implementation returns: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069
and the vb.net example returns: ƒeñüS-ÁHÖ]ü-KÖw(JÝÒ mi"
What am I missing? I assume it's something to do with the character encoding?
[code]...
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