Decrypt A Datetime.Now.Day String Stored In Registry Using Rijndael
Jun 2, 2012
I recently have been developing a app that uses the rijndael encrypt and decrypt function it stores dates in the registry (encrypted with a key using the algorithm)
for example Dim strOldDay As String = Key.GetValue("UserSettings", "").ToString the key was made using a private function called "createkeys"
example:
dim current as currentdate
Current.Day = DateTime.Now.Day.ToString
Current.Day = Encrypt(pPassPhrase, Current.Day)
[Code]....
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Jun 13, 2011
Need to design a program that can encrypt and decrypt messages stored in simple text files using a private key stored in a separate file. Software should also be able to allow the users to enter simple messages that either displays the encrypted or decrypted message. The encryption method should use a simple substitution method. It should be set out in the following format:
Example (the "@" is the separator):
@
The character The Code End of line
A @ 4gh EOL
B @ 84!9 EOL
Has to use the 256 ASCII character codes. The separator will be used to separate the character and its corresponding code.Here are the pseudocodes I have come up with:
� Read any private key file
separator = readline(file);
while not EOF(file) do
tempStr = readline(file);
[code].....
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Jan 11, 2012
I am trying to decrypt my password stored in aspnet_membership table... I am using the following code,
[Code]...
but at the line of DecryptPassword(encodedPassword) it shows error as "Length of the data to decrypt is invalid."
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Jul 14, 2011
Currently, I am try to get the email addresses that have been saved or stored by the user of the computer. This isn't the emails that the user has sent or received, or the contacts he/she has in his address book. Just simply the email accounts that have been accessed from the computer.I know that there are some locations stored in the registry that have the email account. The email addresses that are used on the current computer. I just can't seem to find them on my computer.I am not sure if the registry is the only place to find it or if it stored on the web browser such as internet explorer or google chrome.
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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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Feb 1, 2009
I am trying to submit a datetime taken from a calendar into a stored procedure. I have a variable set as a datetime = calendar.selecteddate. I can print this to the page. I am getting the error "System.Data.SqlClient.SqlException: Error converting data type nvarchar to datetime.". The stored procedure is expecting @expirydate as datetime, and I am adding the date to the insertparameters as datetime. I dont have any idea why this is occuringThe date I am submitting is in dd/MM/yyyy format. I am also adding a created date into the database which is set to GetDate() in the stored procedure. This is also dd/MM/yyyy format.Does anyone have any idea why this error is occurring? It seems that any dates submitted with the day <= 12 are fine - they submit into the database
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Mar 23, 2011
how to convert string to datetime and calculate date
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Aug 25, 2011
Actually I have datetime value stored in the database. What I am taking from the textbox is a time value. I want to extract those results from the database which are between the given time value....To be more concise, my application is a booking system for a sports club and provides an option to view alreaady made bookings.. Here i offer two options either to view all bookings for a specific game or to filter bookings. In filter bookings one option is to filter through date and time...Date option is running okay but problem lies in time part...I provide two times but unable to view bookings between them...
My code is:
Dim prmtimefrom As New SqlParameter("@booking_time", SqlDbType.DateTime)
prmtimefrom.Value = TextBox3.Text
Dim prmtimeto As New SqlParameter("@booking_tim", SqlDbType.DateTime)
[code]....
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Apr 27, 2011
i'm trying to execute a SQL stored procedure with a parameter that needs the SQL datetime format as:
Dim str_runproc As String
str_runproc = "exec UP_stopactivity @Activity='" & DGV_currentactivities.CurrentRow.Cells(0).Value & "' ,@Client='" & DGV_currentactivities.CurrentRow.Cells(2).Value & "',@starttime='" &
DGV_currentactivities.CurrentRow.Cells(3).Value & "'"
the DGV_currentactivities.CurrentRow.Cells(3).value is a datetime value that is put into a Datagridview via another stored procedure. When I run it in sql, it lists as a correct SQL datetime: 2011-04-27 05:54:51.003, in the datagridview it lists as: 27/04/2011 5:54:51
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Mar 3, 2011
I have a stored procedure which updates a database using the parameters I supply but I'm having trouble passing a NULL to the stored procedure
The field I need to make NULL is a DateTime field
DB.Parameters.AddWithValue("@date", NULL)
This gives me the error 'NULL' is not declared. 'Null' constant is no longer supported; use 'System.DBNull' instead
[Code]...
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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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Jun 13, 2010
There is a problem with the source code. I cannot convert the string to decrypt from encrypt string.[code]I went on breakpoint on that line and I have looked on quickwatch. The error I have caught is that convert is a type and cannot be used as an expression.
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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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Jan 26, 2011
Is it possible to decrypt a SHA1 string in VB.Net, knowing the key? I have seen "decryption" of credentials before, however - in Java: [URL]
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Nov 25, 2008
I can encrypt a string with this code. It works fine.
Imports Microsoft.VisualBasic
Imports System.IO
Imports System.Security.Cryptography
[Code]......
But i am not able to decrypt the string i am using this code to decrypt. It gives error that Padding is invalid and can not be removed.
Imports Microsoft.VisualBasic
Imports System.Security.Cryptography
Imports System.IO
[Code].....
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Apr 8, 2010
I am retrieving lists of crc32 hashes that contain names of files, not there contents.I need to be able to decrypt the strings which are hashed names like "vacationplans_2010.txt" which are less then 25 characters long.
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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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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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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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Jan 25, 2011
I have been having some problems trying to decrypt the string returned back from SagePay.I used their asp.net kit which included the encrypt and decrypt functions using base64 - sending the information to SagePay is not a problem but I am having a number of problems trying to descrypt the string.Here is the function I am using to descypt:
Private Function base64Decode(ByVal strEncoded As String) As String
Dim iRealLength As Integer
Dim strReturn As String
Dim iBy4 As Integer
[code]....
I don't think the web server is trying to encode anything as there are no + symbols within the url string and I have just glanced over the two to compair they are the same.This returns a blank string whereas when I use the sections commented out in the first loop i get a really weired string back and when I use their simpleXor function it just returns complete nonsense.
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Jul 30, 2009
I have a Session variable in which i have stored one date '22/7/2009'.Now i want to convert value in session to datetime. I tried folowing code:
Session("AppointmentDate") = Request.QueryString("ADate")
Dim s as datetime=Convert.ToDateTime(Session("AppointmentDate"))
But error is showing as 'string is not recognized as a valid datetime'. convert value in Session to date?
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Jul 16, 2010
am making a project were the user can put a specific time in a textbox. the program needs to check the system time and the time in the textboxif they are the same there needs to start an action.
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Mar 10, 2010
I need to convert a text "WER20903.10" to a date
Dim Filename As String
Filename = "WER20903.10"
Filename = Filename.Substring(4, 7)
Dim dt As Date
dt = CDate(Format(Filename, "ddMMyy"))
Im getting the error: Conversion from string "ddMMyy" to type 'Date' is not valid.
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Jun 9, 2011
I have the following string:
20111209
How do I turn this into a DateTime Value? I've tried Convert.ToDateTime(s) normally but it keeps yelling that I'm doing things wrong because the string doesn't look like a datetime value.
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Jun 18, 2012
I am getting this datetime format in an xml file:
2012-06-14T11:15:41.587-07:00
2012-06-14T10:49:32.397-07:00
2012-06-11T11:10:49.2-07:00
I believe I understand some of it, please correct me if I am wrong:
2012-06-14 = date
T = time identifier
10:49:32.397 = hour min second milliseconds
-07:00 = I have no idea
I need to convert this to something I can sort on for my datagrid view.
When I try something like this:
Console.WriteLine(String.Format("{0:d/M/yyyy HH:mm:ss}", "2012-06-14T10:49:32.397-07:00"))
I'm getting the original string back out with no conversion.
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Nov 22, 2010
I'm pulling a saved DateTime using
Dim testDate As DateTime
testDate = rsQuery.Fields("ScenarioDate").Value
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Aug 7, 2009
So, I'm trying to do this...DatumRodjenja_db = DatumRodjenja.Substring(6, 4) & "-" & DatumRodjenja.Substring(3, 2) & "-" & DatumRodjenja.Substring(0, 2)Where DatumRodjenja_db is DateTime variable, and DatumRodjenja is String. And even after that, I'm still getting DatumRodjenja_db in this format "DD.MM.YYYY."
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Sep 27, 2011
Using VB.Net
When i click the gridview column, that selected column items should appear in the datetime picker
GridView Column value is string, datetime picker datatype is datetime
Code
Private Sub gridview1_CellContentDoubleClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles gridview1.CellContentDoubleClick
Dim i As Integer
[Code]....
When i clicked the gridview column, it is showing error as "Conversion from string "25/09/2011" to type 'Date' is not valid"
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Jan 17, 2011
looking to convert this string into datetime20101119T162837And then also how to compare this string to current time so I can say, i.e:
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