Imports System.Text
Imports System.Security.Cryptography
Public Class Utils
Public Shared Function GetLogFilePath() As String
Return IO.Path.Combine(Environment.CurrentDirectory, "Log.txt")
End Function
Public Shared Function DecryptString(EncryptedString As String) As String
If String.IsNullOrEmpty(EncryptedString) Then
Return String.Empty
Else
Return Decrypt(EncryptedString, "N3st22", "88552299", 2, "464R5DFA5DL6LE28", 256)
End If
End Function
Public Shared Function EncryptString(PlainString As String) As String
If String.IsNullOrEmpty(PlainString) Then
Return String.Empty
Else
Return Encrypt(PlainString, "N3st22", "88552299", 2, "464R5DFA5DL6LE28", 256)
End If
End Function
Public Shared Function Encrypt(ByVal plainText As String, _
ByVal passPhrase As String, _
ByVal saltValue As String, _
ByVal passwordIterations As Integer, _
ByVal initVector As String, _
ByVal keySize As Integer) _
As String
Dim initVectorBytes As Byte() = Encoding.ASCII.GetBytes(initVector)
Dim saltValueBytes As Byte() = Encoding.ASCII.GetBytes(saltValue)
Dim plainTextBytes As Byte() = Encoding.ASCII.GetBytes(plainText)
Dim password As New Rfc2898DeriveBytes(passPhrase, _
saltValueBytes, _
passwordIterations)
Dim keyBytes As Byte() = password.GetBytes(CInt(keySize / 8))
Dim symmetricKey As New AesCryptoServiceProvider
symmetricKey.Mode = CipherMode.CBC
Dim encryptor As ICryptoTransform = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes)
Using memoryStream As New IO.MemoryStream()
Using cryptoStream As New CryptoStream(memoryStream, _
encryptor, _
CryptoStreamMode.Write)
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length)
cryptoStream.FlushFinalBlock()
Dim cipherTextBytes As Byte() = memoryStream.ToArray()
memoryStream.Close()
cryptoStream.Close()
Return Convert.ToBase64String(cipherTextBytes)
End Using
End Using
End Function
Public Shared Function Decrypt(ByVal cipherText As String, _
ByVal passPhrase As String, _
ByVal saltValue As String, _
ByVal passwordIterations As Integer, _
ByVal initVector As String, _
ByVal keySize As Integer) _
As String
Dim initVectorBytes As Byte()
initVectorBytes = Encoding.ASCII.GetBytes(initVector)
Dim saltValueBytes As Byte()
saltValueBytes = Encoding.ASCII.GetBytes(saltValue)
Dim cipherTextBytes As Byte()
cipherTextBytes = Convert.FromBase64String(cipherText)
Dim password As New Rfc2898DeriveBytes(passPhrase, _
saltValueBytes, _
passwordIterations)
Dim keyBytes As Byte()
keyBytes = password.GetBytes(CInt(keySize / 8))
Dim symmetricKey As New AesCryptoServiceProvider
symmetricKey.Mode = CipherMode.CBC
Dim decryptor As ICryptoTransform
decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes)
Dim memoryStream As IO.MemoryStream
memoryStream = New IO.MemoryStream(cipherTextBytes)
Dim cryptoStream As CryptoStream
cryptoStream = New CryptoStream(memoryStream, _
decryptor, _
CryptoStreamMode.Read)
Dim plainTextBytes As Byte()
ReDim plainTextBytes(cipherTextBytes.Length)
Dim decryptedByteCount As Integer
decryptedByteCount = cryptoStream.Read(plainTextBytes, _
0, _
plainTextBytes.Length)
memoryStream.Close()
cryptoStream.Close()
Dim plainText As String
plainText = Encoding.ASCII.GetString(plainTextBytes, _
0, _
decryptedByteCount)
Return plainText
End Function
End Class Write, Run & Share VB.net code online using OneCompiler's VB.net online compiler for free. It's one of the robust, feature-rich online compilers for VB.net language, running on the latest version 16. Getting started with the OneCompiler's VB.net compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as VB.net. OneCompiler also has reference programs, where you can look for the sample code to get started with.
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Public Module Program
Public Sub Main(args() As string)
Dim name as String = Console.ReadLine() ' Reading input from STDIN
Console.WriteLine("Hello " & name) ' Writing output to STDOUT
End Sub
End Module
Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.
Variable is a name given to the storage area in order to identify them in our programs.
Simple syntax of Variable declaration is as follows
Dim variableName [ As [ New ] dataType ] [ = initializer ]
variableName = value
If condition-expression Then
'code
End If
If(conditional-expression)Then
'code if the conditional-expression is true
Else
'code if the conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
Else If(conditional-expression) Then
'code if the above conditional-expression is true
Else
'code if the above conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
If(conditional-expression)Then
'code if the above conditional-expression is true
End If
End If
Select [ Case ] expression
[ Case expressionlist
'code ]
[ Case Else
'code ]
End Select
For counter [ As datatype ] = begin To end [ Step step ]
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ counter ]
For Each element [ As datatype ] In group
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ element ]
While conditional-expression
'Code
[ Continue While ]
'Code
[ Exit While ]
'Code
End While
Do { While | Until } conditional-expression
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop
Do
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop { While | Until } conditional-expression
Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Procedures are of two types.
Functions return a value when they are called.
[accessModifiers] Function functionName [(parameterList)] As returnType
'code
End Function
Sub-procedures are similar to functions but they don't return any value.
Sub ProcedureName (parameterList)
'Code
End Sub