Problem in using GetHashCode method

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I have used GetHashCode() to encrypt password field.
When new user is created the password entered by user is stored in hascode value like

C#

string pswd = txtPassword.text.GetHashCode();

then this pswd string is stored in database. After that when user login to his account then again I convert user's entered value in hascode value like

C#

string userPassword = txtEnterPassword.text.GetHashcode();

Then I check the value of the password saved in database and user's text is matching or not. This working fine in my development server.

But when I uploaded this page in live server it's not working. When user create new account and after that he try to login with his correct password he cannot login to the page.

I searched the solution in msdn then I read this line: 'The default implementation of the GetHashCode method does not guarantee unique return values for different objects.' What I should to do now. Please anyone have any idea?

Posted 9-Oct-12 23:50pm

Dinesh Ambaliya

Updated 10-Oct-12 10:26am

I.explore.code

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fjdiewornncalwe · Answer 1 · 2012-10-10T11:02:00

Solution 3

Your best bet is not to do it that way. See these code project resources for how you can approach your password encryption issues:

Password Storage: How to do it.[^]
Fractal encryption algorithm[^]
The Art & Science of Storing Passwords[^]

Posted 10-Oct-12 11:02am

fjdiewornncalwe

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Abhinav S 10-Oct-12 23:38pm

Good links.

I.explore.code · Answer 2 · 2012-10-10T10:32:00

Well, either you can override and provide your own GetHashCode() or you can use MD5 to generate a hash based on the value input.

This link talks about GetHashCode(): Link GHC[^]

and this link talks about MD5: Link MD5[^]

PS: I have used MD5 in the past with reasonable success to generate a hash based on the user input value and then store this hash as an "encrypted" password.

wizardzz · Answer 3 · 2012-10-10T10:42:00

I searched the solution in msdn then I read this line: 'The default implementation of the GetHashCode method does not guarantee unique return values for different objects.'
That is not going to be the issue here. I believe this just means that 2 different objects can have the same hash value (not unique), not vice versa, which is your concern.

Problem in using GetHashCode method

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