Is there a build in library in .NET that can compute secure one-way hash ? I mean a library that implements SHA-2 cryptographic hash function or something similar.
If is there is no SHA-2 implementation some weaker hash funcion would be sufficient. If there are more options I prefer the most secure one.
provide a use example e.g. provide the code that returns one-way hash for string mySampleString.
I have a variable such as this string URL="http//:localhost, myhomepage";
how do I easily add the above into a hash table? With the url part being the key and the description being the value.
The coding language is C#3.0What is the most optimum method to retrieve all hashtable keys into string separated by a delimiter ","Is the for loop or the foreach loop the only option?
Update: the keys are already strings
So I'm writing an MVC application, and have a JsonResult post back to obtain some item information for scanned items on a warehouse application I am writing. I'm trying to obtain a URL query string value though, and cannot seem to obtain one via the normal 'Request.QueryString['variable']' way... Is there a way to do this? I also thought about just passing the parameter into my post, but I already have a single value on my jquery post, and I am unsure if I can tack on more values to this.
View 7 RepliesHopefully someone knows a way to fix this issue, but here is my problem. I need to be able to recreate a md5 hash that will be the equivalent of the hash that php would generate.
The encoding I have tried is listed below. None of these will produce the same values.
UnicodeEncoding
UTF7Encoding
UTF8Encoding
UTF32Encoding
I have such URL
localhost/Login/LogOn?ReturnUrl=/#&q=my%20search%20word&f=1//447044365|2//4
I need to get hash parameters to navigate in the application after authentication.
I try to catch it like this
<input name="returnUrl" value="<%= ViewContext.HttpContext.Request.Url.PathAndQuery %>" type="hidden" />
But result is
/Login/LogOn?ReturnUrl=/
I tried to take away "/#" in the URL, then I get whole URL. But I need to use this URL as it is.
On an ASP.NET page with a tabstrip, I'm using the hash code in the URL to keep track of what tab I'm on (using the BBQ jQuery plugin). For example:
http://mysite.com/foo/home#tab=budget
Unfortunately, I've just realized that there are a couple of places on the page where I'm using an old-fashioned ASP.NET postback to do stuff, and when the postback is complete, the hash is gone:
http://mysite.com/foo/home
... so I'm whisked away to a different tab. No good.
This is a webforms site (not MVC) using .NET 4.0. As you can see, though, I am using URL routing.
Is there a way to tell ASP.NET to keep the hash in the URL following a postback?
[Code]....
This works, but I would like to obtain further information Year. Currently only displays a number. How to include the year in txtStevilka.Text?
I am using MVC 2 right out of the box, and the control gives the login and seems to work wonderfully. Now I am trying to find out the userId of the person who is logged in, so that i can retrieve information that is only needed for that one person. How do i find out how is logged in?
View 2 RepliesI need to pass some info to a 3rd party (for tracking) and they require I provide a checksum value which is an md5 hashed amalgamation of some of the other values. This is my code :
[Code]....
They keep rejecting my checksum. When I have tested for the following value passed in preConvert - 300265215063.79 I get :
My code gives : ED4463C84DE9D21B54C4E62F2D72CE
An online MD5 hash gives : 0ed40463c84de9d21b54c4e62f2d72ce
Which apart from the case, is exactly the same apart from missing 2 zeroes.
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?
Is this how hashed password stored in SQL Server should look like? This is function I use to hash password (I found it in some tutorial)
public string EncryptPassword(string password)
{
//we use codepage 1252 because that is what sql server uses
byte[] pwdBytes = Encoding.GetEncoding(1252).GetBytes(password);
byte[] hashBytes = System.Security.Cryptography.MD5.Create().ComputeHash(pwdBytes);
return Encoding.GetEncoding(1252).GetString(hashBytes);
}
EDIT: I tried to use sha-1 and now strings seem to look like as they are suppose to:
public string EncryptPassword(string password)
{
return FormsAuthentication.HashPasswordForStoringInConfigFile(password, "sha1");
}
// example output: 39A43BDB7827112409EFED3473F804E9E01DB4A8
Result from the image above looks like broken string, but this sha-1 looks normal....
i m trying to change my password. the password in database is in hash formatting. the class FormsAuthentication. is using for hash conversion. the password is indicating the same in if condition. but after if applying it suddenly go on else part , even the value on if condition is same.
View 2 RepliesUsing this code on the javascript side and
Using sha As New SHA256Managed
Using memStream As New MemoryStream(Encoding.ASCII.GetBytes("Hello World!"))
Dim hash() As Byte = sha.ComputeHash(memStream)
Dim res As String = Encoding.Default.GetString(hash)
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]...
Is there a way of creating a hash key that can be used by our different servers for decrypting connection strings in web.config, and how would I do that?
View 1 RepliesI need to get the Hash value from url. Example:
Photos.aspx?area=photo&Id=2#22
Get the 22 after #.
How can this be done easily.
IN ASP.NET and not Javascript
How to create a hash key based on the user login? And based on that hash key how create persistent url for that user?
i.e picasa album sharing based on one identity key value.
i'm a beginner web programmer. I've been coding desktop applications primarily. Right now, i have created this web app, in Silverlight, that uses a web service of my own for querying the database. The thing is, one of the app functionalities is the ability to open PDF files. I know that silverlight won't let you do this, but using an IFrame on top of the silverlight application you are able to display a page with de pdf file (using acrobat plug in). So here's the problem, my silverlight app passes the pdf path to the web service and, in return, the web service would create a new Page and pass the new page URI back so that it can be displayed on the IFrame:
[Code]....
What is the best way to get the value of a dropdownlist control before it has been changed and after it has been changed. Can it be done in one routine? In other words, if a user clicks on a dropdownlist control and changes it's value, I need to get the old value and the new value and send both these values as input parameters to a stored proc.
View 3 RepliesI have a website with server-side code that needs to determine the physical path of the website on disk from the sites url...
Example 1: Given www.mysite.com, how can I determine the physical directory it is mapped to?
Example 2: Given dev.mysite.com, again, how can I determine it's physical directory?
I've a pre-supplied public function in classic asp that creates a hash value - it is pretty complex and I'd rather not convert it to .net if at all possible (mainly as I don't understand half of what it does!) I'm running it under IIS7 on VWD2008 express. How would you call a function in that asp file? do you have to redirect or as it is #included into the asp.net file, is there an eaiser way? At the moment the complier does not spot the function and says it is not declared.
View 2 RepliesI need to create some links to the Twitter search page.
In my first example 'link1', that works fine, when you click the link you go to the twitter search results for 'wc2010'.
However, in my second link I want to search for the hashtag+wx2010, which is how data is related/grouped on Twitter. My second link always just redirects to a user called 'wc20210' which is not what I want. How can I create a link to a hashtagged word on Twitter?
string link1 = "<a href='http://www.twitter.com/search?q=wc2010'>Link 1 to Twitter</a>";
string link2 = "<a href='http://www.twitter.com/search?q=#wc2010'>Link 2 to Twitter</a>";
Response.Write(link1.ToString() + "<p>");
Response.Write(link2.ToString());
I am here to generate a unique pin no of fixed length. All my previously generate pin no are stored in database and i want newly generated pin no to be unique.
I want to combine serial no and custom key and generate unique pin no.
I'm trying to optimize my ASP.NET thumbnailing script, so it doesn't resize all the images all the time, and one part of the problem is choosing the hash function for the thumbnail naming/checking procedure.Is crc32 up to the task - I'm asking cause the input data is small(only relative path, size and date)?
View 1 RepliesI need to create a hash key on my tables for uniqueness and someone mentioned to me about md5. But I have read about checksum and binary sum; would this not serve the same purpose? To ensure no duplicates in a specific field.
How can implement this? do I need to write code in my vb application which populates the tables with stored procedures or can I do this from SQL server 2005 studio express?