本文整理汇总了VB.NET中System.Security.Cryptography.CryptoAPITransform类的典型用法代码示例。如果您正苦于以下问题:VB.NET CryptoAPITransform类的具体用法?VB.NET CryptoAPITransform怎么用?VB.NET CryptoAPITransform使用的例子?那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了CryptoAPITransform类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Form1
' 导入命名空间
Imports System.Security.Cryptography
Imports System.Collections
Imports System.Text
Public Class Form1
Inherits System.Windows.Forms.Form
' Use a public service provider for encryption and decryption.
Dim desCSP As New DESCryptoServiceProvider
' Event handler for Run button.
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
tbxOutput.Cursor = Cursors.WaitCursor
tbxOutput.Text = ""
Dim message As String = "01234567890123456789"
Dim sourceBytes() As Byte = Encoding.ASCII.GetBytes(message)
tbxOutput.AppendText("** Phrase to be encoded: " + message + vbCrLf)
Dim encodedBytes() As Byte = EncodeBytes(sourceBytes)
tbxOutput.AppendText("** Phrase after encoding: " + _
Encoding.ASCII.GetString(encodedBytes) + vbCrLf)
Dim decodedBytes() As Byte = DecodeBytes(encodedBytes)
tbxOutput.AppendText("** Phrase after decoding: " + _
Encoding.ASCII.GetString(decodedBytes) + vbCrLf)
tbxOutput.AppendText(vbCrLf + "Sample ended successfully; " + _
"press Enter to continue.")
tbxOutput.Cursor = Cursors.Default
End Sub
' Encode the specified byte array by using CryptoAPITranform.
Private Function EncodeBytes(ByVal sourceBytes() As Byte) As Byte()
Dim currentPosition As Int16 = 0
Dim targetBytes(1024) As Byte
Dim sourceByteLength As Integer = sourceBytes.Length
' Create a DES encryptor from this instance to perform encryption.
Dim cryptoTransform As CryptoAPITransform
cryptoTransform = CType(desCSP.CreateEncryptor(), CryptoAPITransform)
' Retrieve the block size to read the bytes.
Dim inputBlockSize As Integer = cryptoTransform.InputBlockSize
' Retrieve the key handle.
Dim keyHandle As IntPtr = cryptoTransform.KeyHandle
' Retrieve the block size to write the bytes.
Dim outputBlockSize As Integer = cryptoTransform.OutputBlockSize
Try
' Determine if multiple blocks can be transformed.
If (cryptoTransform.CanTransformMultipleBlocks) Then
Dim numBytesRead As Int16 = 0
While (sourceByteLength - currentPosition >= inputBlockSize)
' Transform the bytes from currentposition in the
' sourceBytes array, writing the bytes to the targetBytes
' array.
numBytesRead = cryptoTransform.TransformBlock( _
sourceBytes, _
currentPosition, _
inputBlockSize, _
targetBytes, _
currentPosition)
' Advance the current position in the sourceBytes array.
currentPosition += numBytesRead
End While
' Transform the final block of bytes.
Dim finalBytes() As Byte
finalBytes = cryptoTransform.TransformFinalBlock( _
sourceBytes, _
currentPosition, _
sourceByteLength - currentPosition)
' Copy the contents of the finalBytes array to the targetBytes
' array.
finalBytes.CopyTo(targetBytes, currentPosition)
End If
Catch ex As Exception
tbxOutput.AppendText("Caught unexpected exception:" + _
ex.ToString() + vbCrLf)
End Try
' Determine if the current transform can be reused.
If (Not cryptoTransform.CanReuseTransform) Then
' Free up any used resources.
cryptoTransform.Clear()
End If
' Trim the extra bytes in the array that were not used.
Return TrimArray(targetBytes)
End Function
' Decode the specified byte array using CryptoAPITranform.
Private Function DecodeBytes(ByVal sourceBytes() As Byte) As Byte()
Dim currentPosition As Int16 = 0
Dim targetBytes(1024) As Byte
Dim sourceByteLength As Integer = sourceBytes.Length
' Create a DES decryptor from this instance to perform decryption.
Dim cryptoTransform As CryptoAPITransform
cryptoTransform = CType(desCSP.CreateDecryptor(), CryptoAPITransform)
Dim inputBlockSize As Integer = cryptoTransform.InputBlockSize
Try
' Determine if multiple blocks can be transformed.
If (cryptoTransform.CanTransformMultipleBlocks) Then
Dim numBytesRead As Int16 = 0
While (sourceByteLength - currentPosition >= inputBlockSize)
' Transform the bytes from currentPosition in the
' sourceBytes array, writing the bytes to the targetBytes
' array.
numBytesRead = cryptoTransform.TransformBlock( _
sourceBytes, _
currentPosition, _
inputBlockSize, _
targetBytes, _
currentPosition)
' Advance the current position in the source array.
currentPosition += numBytesRead
End While
' Transform the final block of bytes.
Dim finalBytes() As Byte
finalBytes = cryptoTransform.TransformFinalBlock( _
sourceBytes, _
currentPosition, _
sourceByteLength - currentPosition)
' Copy the contents of the finalBytes array to the targetBytes
' array.
finalBytes.CopyTo(targetBytes, currentPosition)
End If
Catch ex As Exception
tbxOutput.AppendText("Caught unexpected exception:" + _
ex.ToString() + vbCrLf)
End Try
' Strip out the second block of bytes.
Array.Copy(targetBytes, (inputBlockSize * 2), targetBytes, inputBlockSize, targetBytes.Length - (inputBlockSize * 2))
' Trim the extra bytes in the array that were not used.
Return TrimArray(targetBytes)
End Function
' Resize the dimensions of the array to a size that contains only valid
' bytes.
Private Function TrimArray(ByVal targetArray() As Byte) As Byte()
Dim enum1 As IEnumerator = targetArray.GetEnumerator()
Dim i As Int16 = 0
While (enum1.MoveNext())
If (enum1.Current.ToString().Equals("0")) Then
Exit While
End If
i += 1
End While
' Create a new array with the number of valid bytes.
Dim returnedArray(i - 1) As Byte
For j As Int16 = 0 To i - 1 Step 1
returnedArray(j) = targetArray(j)
Next
Return returnedArray
End Function
' Event handler for Exit button.
Private Sub Button2_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
Application.Exit()
End Sub
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Panel2 As System.Windows.Forms.Panel
Friend WithEvents Panel1 As System.Windows.Forms.Panel
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.Panel2 = New System.Windows.Forms.Panel
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Panel1 = New System.Windows.Forms.Panel
Me.tbxOutput = New System.Windows.Forms.RichTextBox
Me.Panel2.SuspendLayout()
Me.Panel1.SuspendLayout()
Me.SuspendLayout()
'
'Panel2
'
Me.Panel2.Controls.Add(Me.Button1)
Me.Panel2.Controls.Add(Me.Button2)
Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
Me.Panel2.DockPadding.All = 20
Me.Panel2.Location = New System.Drawing.Point(0, 320)
Me.Panel2.Name = "Panel2"
Me.Panel2.Size = New System.Drawing.Size(616, 64)
Me.Panel2.TabIndex = 1
'
'Button1
'
Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
Me.Button1.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button1.Location = New System.Drawing.Point(446, 20)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(75, 24)
Me.Button1.TabIndex = 2
Me.Button1.Text = "&Run"
'
'Button2
'
Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
Me.Button2.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button2.Location = New System.Drawing.Point(521, 20)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(75, 24)
Me.Button2.TabIndex = 3
Me.Button2.Text = "E&xit"
'
'Panel1
'
Me.Panel1.Controls.Add(Me.tbxOutput)
Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
Me.Panel1.DockPadding.All = 20
Me.Panel1.Location = New System.Drawing.Point(0, 0)
Me.Panel1.Name = "Panel1"
Me.Panel1.Size = New System.Drawing.Size(616, 320)
Me.Panel1.TabIndex = 2
'
'tbxOutput
'
Me.tbxOutput.AccessibleDescription = _
"Displays output from application."
Me.tbxOutput.AccessibleName = "Output textbox."
Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
Me.tbxOutput.Name = "tbxOutput"
Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
Me.tbxOutput.TabIndex = 1
Me.tbxOutput.Text = "Click the Run button to run the application."
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(616, 384)
Me.Controls.Add(Me.Panel1)
Me.Controls.Add(Me.Panel2)
Me.Name = "Form1"
Me.Text = "CryptoAPITransform"
Me.Panel2.ResumeLayout(False)
Me.Panel1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
#End Region
End Class
输出:
** Phrase to be encoded: 01234567890123456789 ** Phrase after encoding: Eaa0$\iv\oXgS ** Phrase after decoding: 01234567890123456789 Sample ended successfully; press Enter to continue.