C# - Bob Jenkins Perfect Hash Function In .Net?
Apr 20, 2012
I am trying to convert Bob Jenkins perfect hash function from C# to VB.Net and I am stuck at following.
a += (UInt32)(url[k + 0] + (url[k + 1] << 8) + (url[k + 2] << 16) + (url[k + 3] << 24))
How can I write above statement in VB.Net?
a is UInt32
url is String
k is Integer
I tried the following but it doesn't work.
a += url(k + 0) + (url(k + 1) << 8) + (url(k + 2) << 16) + (url(k + 3) << 24)
To avoid manually doing type casting, I am using "Option Strict Off"
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Mar 16, 2011
I am writing a string of about 120 characters to a 2D barcode. Along with other text, the string contains a unique ticket number. I want to ensure that someone doesn't generate counterfeit tickets by reading the 2D barcode and generation their own barcoded tickets.
I would like to hash the string and append the hash value to what gets embedded in the barcode. That way I can compare the two on reading and see if the data had been tampered with. I have seen several hash function that return 64 bytes and up but the more characters you embed in a 2D barcode the bigger the barcode image becomes. I would like an algorithm that returns a fairly small value. It would also be nice if I could provide the function my own key. Collision is not that big of a deal. This isn't any kind of national security application.
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Sep 17, 2009
Does anyone have a working class or function to create the hashed email that is sent to facebook to register email addresses with connect.registerUsers?
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Apr 18, 2012
I need to hash a number (about 22 digits) and the result length must be less than 12 characters. It can be a number or a mix of characters, and must be unique. (The number entered will be unique too). For example, if the number entered is 000000000000000000001, the result should be something like 2s5As5A62s. I looked at the typical, like MD5, SHA-1, etc., but they give high length results.
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Aug 5, 2010
Drawing a 3-D border should be easy enough, right? Nope. Does anyone know how to draw a border that looks exactly like TextBox's? Right now, I'm just drawing black lines at the top + left and white at the bottom + right but the bevel isn't nice and when the background color is white, the bottom + right don't show up.
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Nov 6, 2010
So I am trying to solve this program using the algorithm given, and I get no error messages but everytime I execute the program it just crashes. Any idea what I am doing wrong?\The user wants a program that will return a set of perfect numbers based on the value that is given. If the user types in 3, the program will return 3 perfect numbers
So this is the code I have so far...
dim perfectnumber as integer = 2
dim divisorRunningSum As Integer = 2
[code].....
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Sep 23, 2010
I need a vb.net console program to check whether a number is perfect or not.
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Mar 13, 2011
Almost 2 months i try to find perfect solution for my project. I making one multi-user chat application with SERVER and CLIENT application. I read a lot of material about socket communication and try a million of examples all around, some in C# some in VB.net, but I can't find solution.Problem that every example and my try have is when 10-20 user chatting really fast, server reacting slow or whatever is, but final product is that two or many message show in one LINE. For example if i send string "test1" and an my friend, let's call him FRIEND1, send "test2" almost in same time, server sending it to all connected clients like this:stefanACM:test1FRIEND1:test2.I try to implement in my application "Asynchronous TcpListener & TcpClient" from jmcilhinney, but have same problem...
So, can anybody help me with this.I just need one server application that will recive connection, save IP and nick of connected user, and send every message that client sent to all connected users (of course without problem that I mention on beginning of post). On end, that when client disconnect just to close connection.From Client side I need just connect part, send and receive messages.
So in one line, I think I need BASIC EXAMPLE OF PERFECT MULTI USER CHAT CLIENT AND SERVER, without any hiden bug.If someone decide to help me with code,
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Oct 7, 2009
What wrong with my databinding? How to correct the perfect binding with combobox and texbox.. When I select Projectname the other are changing except the email... Why the email is not changing?
Code:
commemails = New OleDbCommand
daemails = New OleDbDataAdapter
dsemails = New DataSet
dtemails = New DataTable
myconn = New OleDbConnection(("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=") + My.Application.Info.DirectoryPath & "SMRPsource.mdb")
[Code] .....
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Jul 3, 2009
I am using this code to bring data in combobox but u_id is the premiry key n not full name then on selection how can i bring the perfect result?[code]...
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Jun 18, 2010
Includes alpha blending, pathfinding, grid rendering, and lots of other algorithms that make basic game programing in VB 2010 a lot simpler. Copy the code in the attached text document into a blank class. Then add it to your project. Initialize as you would any other class...
"Dim aGameGridOrWhatever as New DynamicBitmap"Let me know if anyone finds any bugs in the PathFinding algorithm. I finished it tonight. I'll post some examples of how to do stuff to this thread soon.
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Nov 16, 2011
I am at a bit of a loss at the moment. What I am basically writing is the password elements of a membership system. What I do is generate a random salt value, take the registered password, combine the two and then pass the new string through a function which will generate a SHAManaged 512 hash.
I then convert the hash and salt string into Byte arrays and store these in my database.The problem comes when I then compare a login attempt against the original value I am being supplied with a completely different hash for the password being presented by the user, even though it should be exactly the same.
Here is my code when someone registers their new account:
[Code]...
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Aug 3, 2010
[Code]...
The garbage collector in .NET moves objects, so the object's address is not stable. How is Object's GetHashCode() method implemented?
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Dec 1, 2010
I have an openfiledialog, I show the dialog and the user selects there file. How could I calculate the MD5 hash of the OFD.filename/file opened? Or calculate the SHA1, what ever is easiest.
PS: This is in Visual basic 2010 Express.
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Nov 7, 2010
I know MD5 hashes have been asked about 1000+ times, but this question is slightly different.I am looking to find the true MD5 hash of an image, but without using a string for the file's location. I am looking to be able to call on the image inside of a picturebox rather than somewhere on my computer or the internet.
For example, I want to find the MD5 hash of an image inside of my picturebox.
If this doesn't make sense, please ask any questions you may have.
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Dec 26, 2010
im creating a simple login / registrate form in visual studio 2008 anplant Hash and salt to my login and registrate forms, im using mysql to connect to a online mysql serverthis is my codes i ahve now
Form 1 - Login
Try
DB_Connect = New MySqlConnection()
[code].....
i really need this working, all works but nothing is encrypted
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Feb 6, 2012
I have a page with a URL that includes a hash value (www.mysite.com/#123).What I want to do is use that value to determine what is displayed on the page - much like using a querystring.I am using the hash value because the content on the page can be changed client side (I am avoiding page reloads where possible) - if the user then links to another page and uses the back button to return, I need to use the hash value to display the page as it was when they left it.So I'm looking for an if statement that will look something like this:
[code]...
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Mar 21, 2009
I would like to write a function GetHashCodeOfList() which returns a hashcode of a list of strings regardless of order. Given 2 lists with the same strings should return the same hashcode.
ArrayList list1 = new ArrayList()
list1.Add("String1");
list1.Add("String2");
[Code].....
I can first sort the list, then combine the sorted list into 1 long string and then call GetHashCode(). However sorting is a slow operation. I can get the hash of each individual string (by calling string.GetHashCode()) in the list, then multiplying all hashes and calling Mod UInt32.MaxValue. For Example: "String1".GetHashCode() * "String2".GetHashCode * ... MOD UInt32.MaxValue. But this results in a number overflow.
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Aug 10, 2009
I'm trying to figure out a way to compare two "salted-hash" strings. How can I do this? I know that the salt is a random generated value that's appended to the plain text, then we just compute the hash of that new string.So how can I compare these two values? O_O (The new hash that the user hash written in a textbox and the hash stored in a database)
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Apr 10, 2012
I have a function in VB.net that returns a password hash. I need to make a web interface to the same database and I'm not sure how to return the same hash in PHP. Does anyone know both languages enough to convert this to PHP?
Code:
Public Function GenerateHash(ByVal SourceText As String) As String
'Create an encoding object to ensure the encoding standard for the source text
Dim Ue As New UnicodeEncoding()
[Code].....
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Oct 1, 2010
I am using the following piece of code (where sId is a Unique Id in our system) to generate Unique Hash value of 16 characters Max in length
Dim oMD5Hash As System.Security.Cryptography.SHA1 = System.Security.Cryptography.SHA1.Create()
Dim sHash As String =
[Code].....
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Jun 7, 2012
I am having issues to hash with sha 1 salted in vb. I have an SMF forum and it uses SHA 1 salted to encrypt its passwords. I want to make a program which is only available to users who have registered in my forum so I have to create a login system in my program. The problem is that how do I hash to SHA 1 salted in vb?I have explained what I want to do a bit more in details below:User opens program >They login using their forum account details >Program hashes the PASSWORD the user has entered to SHA 1 salted >The program then connects with the forum's database and compares the password value > (The Username is checked first tho)
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Dec 18, 2011
The code below allows a user to enter user name and password to log in to enter marks of students. SQL data reader verifies the user credentials from the database before authentication takes place. modify the code by salting and hashing the password.
Dim frm As New MarksEntryFrm
Dim flag As Boolean
flag = False
[Code]....
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Apr 1, 2011
I am porting over some code from .net (vb) to php and I came across some md5 hashing that I can't reproduce in php. In the .net one there are two functions one uses UTF-8 encoding and the other uses Unicode encoding. The output is a different hash when passed in a string
// First function (returns GUID)
Dim oHasher As Cryptography.MD5 = Cryptography.MD5.Create()
Dim oEncoder As New System.Text.UTF8Encoding()
Dim csData() As Byte
[Code]...
but they both produce the same result. Is it possible to produce the same results in php with md5 hashing?
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Jul 19, 2011
How do I retrieve a hash value when the value itself is an object.I am giving an example here
dim ht as new hastable
dim person as clsperson
ht.add(0, new ("AAA", "16", "23425345")
ht.add(1, new("BBB", "18", "464745756")
[code]....
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Apr 21, 2012
PLATFORM VERSION INFO
Windows : 5.1.2600.131072 (Win32NT)
Common Language Runtime : 2.0.50727.1433
[code]....
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May 29, 2009
I was asked by an employer to sort a hash table. I always thought that the usage of a hash table was in a way non-sort friendly. Am I wrong in thinking this, and if not can you point me to a good VB.Net(Yes Kill me now, but it's an old system) method of sorting a hash table.
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Jan 31, 2011
Using 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?
So for anyone interested it was 1 simple change.
[Code]...
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Nov 30, 2010
i had to create a hash calculator using vb2008?
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Dec 23, 2008
Does anyone know how to rectify this problem,
ClickOnce Deployment Issue - File Has Different Computed Hash Than Specified In Manifest - Urgent! : ClickOnce and Setup & Deployment Projects : Windows Forms : MSDN Forums
ERROR DETAILS
Following errors were detected during this operation.
[12/22/2008 9:14:26 AM] System.Deployment.Application.InvalidDeploymentExc eption (HashValidation)
- File, NonFormEntryWindow.exe, has a different computed hash than specified in manifest.
- Source: System.Deployment
- Stack trace:
at System.Deployment.Application.ComponentVerifier.Ve rifyFileHash(String filePath, Hash hash)
at System.Deployment.Application.ComponentVerifier.Ve rifyFileHash(String filePath, HashCollection hashCollection)
[CODE]...
COMPONENT STORE TRANSACTION DETAILS: No transaction information is available.
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