Calculate A MD5 Hash?

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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Date Method - Calculate The Number Of Years For My Calculate Age Event Handler

Mar 30, 2009

I am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?

So below is what I have.

Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click
Dim currentDate As Date
Dim BirthDate As Date
Dim Age As Long

[CODE]

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Getting A Different Hash Value?

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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C# - How Is Hash Implemented In .NET

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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MD5 Hash Of Images?

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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Add Hash And Salt To Project?

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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Anchor - If Statement Using The Value Of Hash In URL?

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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C# - Getting Hash Of A List Of Strings?

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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Compare Two Hash Values?

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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Convert VB Generate Hash To PHP

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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Hash Value Of Length 16 Characters

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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How To Hash To SHA 1 Salted - VB 2010

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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How To Salt And Hash A Password

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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Php - How To Produce A Different Md5 Hash With Different Encodings

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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Retrieve Hash Value When The Value Is An Object In .net?

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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.exe.config, Has A Different Computed Hash Than Specified In Manifest?

Apr 21, 2012

PLATFORM VERSION INFO
Windows : 5.1.2600.131072 (Win32NT)
Common Language Runtime : 2.0.50727.1433

[code]....

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.net - Reason For Sorting A Hash Table?

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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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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C# - Javascript HASH And Equivalent .NET Algorithm?

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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Create A Hash Calculator Using Vb2008?

Nov 30, 2010

i had to create a hash calculator using vb2008?

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Deployment :: Exe, Has A Different Computed Hash Than Specified In Manifest

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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Different SHA1 Hash Values Obtained From PHP?

Sep 7, 2011

I have some problems with the SHA1 hash value of a string. I'm trying to send a file from a client written in VB.net to a server written in PHP. My problem is that when I pass the same string to VB.net and PHP, the SHA1 value calculated by VB.net is completely different from the value calculated by PHP.

For example, I want to encode a string in Base64 and then calculate the SHA1 Hash of the Base64 string. When the computer executes this task from the vb.net version and from the PHP version I get two different SHA1 values, even if apparently the Base64 encoded string is the same:

VB.net: 2E97A53B09C482A831540B532845BCAC79BFACCF
PHP: 350A2080264E2724D4BCBC521C35264D264A1DAF

I'm surely missing something, could you point me in the right direction and tell me what I'm doing wrong here?

[Code]...

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Does An Image Hash Number Change

Mar 31, 2010

I saved an images hash number to a database so that when my application pulls in images, I can compare this hash number to the hash numbers of the images comming in. The purpose is that if one of the images comming in has the same hash number, I can flag it. It seems that the saved hash number for an image is not the same for the exactly the same image when it has come in. Is this because the hash number for an image can change depending on the pc where its being created?

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Encrypt File From Sha512 Hash?

Aug 23, 2011

Would like to know how to encrypt a file (lets say a .txt or .xml) with SHA512 hash ? How to proceed ?

What i would want to do is.. check if the file exist.. open it and then read it while unencrypting it.

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FTP And FTP Files List Hash And Webdrive?

Jun 11, 2012

I'd like to make new solution to upload files to webspace i want to check MD5 for the list of files hosted at the webspace .

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Generate MD5 And SHA1 Hash For File?

May 26, 2011

I'm trying to generate an MD5 and SHA1 hash value for a given file with the following:

Imports System
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text

[Code]...

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Hash - Encrypt A String Using HmacSHA256 In .NET?

May 8, 2009

I need to create a keyed hash for a string of XML to send to a 3rd party. This is the code I am using but it is producing a different hash then the example the 3rd party has sent me.

Public Shared Function HashString(ByVal StringToHash As String) As String
Dim myEncoder As New System.Text.UTF32Encoding
Dim Key() As Byte = myEncoder.GetBytes(My.Settings.PortalHASH)
Dim XML() As Byte = myEncoder.GetBytes(StringToHash)

[code]....

It needs to be base-64 encoded, which is why I have the last line.

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Hash Function For 2D Barcode Data?

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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Regarding Hash Values Of System Processes?

Mar 14, 2012

I have implemented a function that calculates the hash value of important system processes. I have a question that if new memory pages are created in the memory space of certain system processes wont their hash value change. Cuz the previously calculated hash values and after the memory pages are created are exactly the same.

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Salt / Hash And Encrypt Pwd In Database

Jun 11, 2011

Im a final year student for COmputer Security / Forensic. Im planning to do a project which requires me to do encryption and decryption. My possible choice of language would be VB.Net. I was wondering if wad is running in my mind can be executed. Well, I would make a application where a part of it wil be promting the guest to register and I wanted to store the password in the database. I did some research and came across Salting and Hashing. I was wondering if is it possible to get the password which the user enters, salt it, hash it and encrypt it before I store in the database. If so, what is the best secured strong encryption can I use in VB.net. Because through out the research I have done, i have sen RInjdael as the most fav encryption algo which alot of programmers using.

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