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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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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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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Jun 11, 2011
so I'm creating a program that creates a SHA512 hash. I have a problem though. I try to encrypt the word 'test' and I get this encrypted hash as:
[Code]...
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Mar 10, 2009
I am doing a school project (in programming) on security, and i am focussing on MD5 hashing, this is a used way to store passwords, usernames etc. since i can't really be reversed..Now since i know that MD5 hashes are always 32 byte long there must be a limited number of different "hashes" even though 32 chars with 16 combinations each is a LOT of combos..Now, i will try to make a program where you put in a 32 byte hash and then, by using the principle above with limited hash amounts, try to find ANY string that matches the hash.I have already got code on how to create the MD5 hash but i need to know how to make the strings...it should hash:chr(1)chr(2)...chr(255)thenchr(1) & chr(1)[code]
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Oct 5, 2011
i'm looking for a function which can create a MD5 hash from a string. Not much luck searching the interwebs, so i thought maybe any of you guys has a solution.
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Jan 23, 2012
I have:
string s = "A=1,B=2,C=3";
I need the output in hashtable using LINQ. Hashtable should be filled as
["A"] | 1
["B"] | 2
["C"] | 3
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Jun 21, 2011
I have the following function for generating sha512 hashs. The hash is generated successfully, but is causing this error when the resulting string is passed to other functions:
Input string was not in a correct format
When debugged the variable holding the returned hash (set as string) is empty. I have tried changing the type to int, int64 and byte (array and standard variable) in the function and in the calling code, which causes various other errors. How can I change the datatype correctly to solve this?
Function create_hash(ByVal password, ByVal salt)
Dim salty As String = password & salt
'convert salty password to binary to feed into hash function
Dim encText As New System.Text.UTF8Encoding()
Dim btText() As Byte
[Code] .....
Calling code:
Dim i_h_pass As String
Dim i_pass As String = pass.Text
'handle password generation (matching passwords checked at validation)
Dim newHash = New hashing
Dim salt As String = Convert.ToString(newHash.create_salt)
i_h_pass = Convert.ToString(newHash.create_hash(i_pass, salt))
The create_salt function has also been checked - it works perfectly and returns a random integer, returned as string for convenience.
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May 27, 2012
Parameters.ReferencedAssemblies.Add("System.dll")
Parameters.ReferencedAssemblies.Add("System.Data.dll")
Parameters.ReferencedAssemblies.Add("System.Windows.Forms.dll")
is a way to encrypt "systems.dll" in the add() value?
something like Add(Char64+char45+...) or any method???
Dim Version = New Dictionary(Of String, String)
Version.Add("CompilerVersion", "v2.0")
[Code]...
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Feb 8, 2011
I made this program to encrypt any given string, I am getting an error that prevents this from being finished.
Public Class Form1
Dim Holder As string
Dim Pass = "Za029fjao"
Dim Helper As String
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Holder = TextBox1.Text
Helper = Holder + Holder * Pass
Textbox2.text = Helper
End Sub
End Class
All I want to do is multiply 2 strings (is that possible?). The error says that string cannot be converted into double...
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Jan 2, 2010
i need a standard way of encrypting a string and decrypting it using AES. I am aware of the Cryptography class, however almost every example creates a class to do the encryption,If .Net already has this implemented and ready to use why would we create classes for encryption and decryption, isn't it as simple as calling the encrypt method of the class or decrpyt and passing in the text. Unless everyone is wanting to centralize the code. But even then i see so many different examples from File,Data Protection etc..
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Apr 23, 2011
I am not sure if there is such thing in VB.NET via 128-bit Encryption or more. [code]...
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Feb 4, 2011
I have a page that has a few text boxes on it and are filled based upon a persons information. Like Name, telephone number, address etc
The data is stored in an Access DB.
I want to add a check box and have a label beside it that if it's checked it shows a hyperlink to a pdf file, if its not checked the link disappears, so toggle between the two.
Here's the check box I have so far, which isn't much:
<br><input type=checkbox name="Password" value="<%=oRs("Password")%>" size=40> Check to show PDF File: <a href="<%=oRs("Password")%>"><%=oRs("Password")%></a><br><br>
I need this hyperlink/ string to be encrypted based upon the persons name, so each person has its own pdf file and no one can just guess anothers pdf file and have access to it....
The pdf file will be stored in a virtual directory within the site.
I don't know Vb or asp, and I'm doing this all in notepad ++
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Dec 12, 2009
Is it possible to encrypt string in VB.NET, so user won't be able to see it, when he opens program with hex editor, or something like that.
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Nov 2, 2011
how to encrypt / decrypt a string in VB.Net.I followed the example given here and wrote the following code (below). There's a text box, an "encrypt" button, and a "decrypt" button. The idea is to type something into the text box ("like 'hello world'"), click "encrypt", and see the encrypted version appear in the text box. Clicking "decrypt" should then take you back to the original string.
But when I try to encrypt I get an error when I try to "FlushFinalBlock". The error is: "Length of the data to encrypt is invalid".The "decrypt" part is a total shot in the dark, as the example quoted above only deals with encryption, not decryption. I'm sure it's wrong, but since I can't get "encrypt" to work I haven't tested it yet.
Imports System.Data.SqlClient
Imports System.IO
Imports System.Security.Cryptography
Public Class Form1
[code]....
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Nov 20, 2010
How to encrypt query string in vb.net ?
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Nov 12, 2009
i have found a few encrypt/decrypt tutorials online but either they dont work or they only work when the application is running so if i encrypt a string using some code i find and save it (in its encrypted form) and then restart the application and enter the saved encrypted string into a textbox and run the decrypt code it wont decrypt it. i don't understand why en/de-cryption is so hard or why there are so little working examples online. could someone be so kind and show me some code that can let me en/de-crypt a string even if i restart the application or use it on a different computer? and doesn't show the weak key errors all the time.
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Dec 16, 2009
I've attempted using code snippets as a test to encrypt a string, save it to a file & the reload it back, decrypting it. I consistently get a "Padding is invalid and cannot be removed." error on decrypting the string.
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Jul 28, 2009
I need some help with encrypting a string. I want to encrypt a string using AES 256-bit encryption with a custom key. How can I go about doing this?
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Jun 25, 2009
I want to encrypt all users' password that stored in database, but also i need to able to decrypt them.How can i do that?Because i try using MD5 method and only get one way ticket
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Feb 23, 2009
I need to be able to encrypt a string in VB.Net 2005 and then be able to decrypt it using PHP on a web server.
PHP offers a variety of options - the best seeming to be mcrypt() but I can't see (easily) a way of encrypting the string in VB.Net
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Oct 18, 2010
I use the following code to initialize encryption...
[Code]...
So I don't think there is a method for PKCS5. Is there any way to add it, or do I need to write an encryption method myself? If so - how do I write that? Is there a reliable DLL that will support it?
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Mar 4, 2010
I want to save my connection string in XML file.How to do that?How to encrypt and decrypt that file using VB.Net
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May 28, 2009
Any example code to encrypt a string using the new ECDSA algorithm?
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Jul 23, 2009
encrypt the string values stored in the code.The problem is that when the code is compiled and the .exe file is generated, anybody can edit the .exe file with an text editor or another program and see the values.This is very important for me, because i have some password stored in string variables?
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Sep 21, 2011
I know this topic has been addressed a million times but please help me out. I have read so many articles on HOW TO encrypt and decrypt the app.config file but I need to know WHEN and WHERE I should encrypt it.
The problem arose because we found an AppName.exe.config file on a users computer and the database username and password was clearly visible. I understand that the .config file gets created during the VB app install process and is used
by the application. I then learned about the aspnet_regiis.exe tool and ran it on the app.config file inside my VB project. I am guessing that was the wrong thing to do.
When I now install the app on user desktops, it gives an error stating failed to decrypt the connection string. Also, when one of my other developers attempts to open the project in his copy of visual studio on his computer, he receives an error when trying to access the setting portion of the project properties. We store all of our projects on a file server and any developer can access the projects via a mapped drive on their computer.
So how am I supposed to encrypt the .config file. If I can't encrypt the App.config file in the development environment, then I'm guessing I have to perform the encryption on the users PC during the install process? How do I do that? Or is that what I am supposed to do?
Just for reference, here is the aspnet_regiis command I ran.
aspnet_regiis.exe -pef "connectionStrings" S:ProjectsDevelopmentVB.netPTPUSourceCodePTPU -prov "DataProtectionConfigurationProvider"
One last thing, maybe it's my misunderstanding of the issue but if this problem has existed since .Net 2.0, why has an option not been built into the development studio to encrypt connection strings?. This would seem to be a very common issue, even their own dataset wizard creates connection strings that are clearly readable.
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Jan 19, 2011
I have a question about the App.Config file. My understanding is that the connection string is stored within this file. I have setup my application so that the App.Config file is not only written to c:users<username>appdatalocal but also to c:users<username>appdataoaming. I plan to encrypt the connection string, my question at this point is will it encrypt the connection string in ALL copies of the App.Config file? It looks like at this point that the App.Config file is stored in two places on the hard drive.
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Jun 13, 2011
I have 1 string : abc @#ABC.xyz123ZYX
Now I need to encode the string:
The encoding alphabetic characters,
CODE:
With this string, after encoding, the result is: zyx @#ZYX.cba123ABC
About Function Encrypt and Function Decrypt?
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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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