vb.net字符加密 vbs 加密( 三 )

Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim ms As New MemoryStream()
Try
Dim inData As Byte() = Convert.FromBase64String(encryptedString)
Try
Dim cs As New CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(inData, 0, inData.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Return Encoding.Default.GetString(ms.ToArray())
Catch
End Try
Finally
ms.Dispose()
End Try
End Function 'Decrypt
'/ summary
'/ 对文件内容进行DES加密
'/ /summary
'/ param name="sourceFile"待加密的文件绝对路径/param
'/ param name="destFile"加密后的文件保存的绝对路径/param
Overloads Public Sub EncryptFile(sourceFile As String, destFile As String)
If Not File.Exists(sourceFile) Then
Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)
End If
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim btFile As Byte() = File.ReadAllBytes(sourceFile)
Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)
Try
Try
Dim cs As New CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(btFile, 0, btFile.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Catch
Finally
fs.Close()
End Try
Finally
fs.Dispose()
End Try
End Sub 'EncryptFile
'/ summary
'/ 对文件内容进行DES加密，加密后覆盖掉原来的文件
'/ /summary
'/ param name="sourceFile"待加密的文件的绝对路径/param
Overloads Public Sub EncryptFile(sourceFile As String)
EncryptFile(sourceFile, sourceFile)
End Sub 'EncryptFile
'/ summary
'/ 对文件内容进行DES解密
'/ /summary
'/ param name="sourceFile"待解密的文件绝对路径/param
'/ param name="destFile"解密后的文件保存的绝对路径/param
Overloads Public Sub DecryptFile(sourceFile As String, destFile As String)
If Not File.Exists(sourceFile) Then
Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)
End If
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim btFile As Byte() = File.ReadAllBytes(sourceFile)
Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)
Try
Try
Dim cs As New CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(btFile, 0, btFile.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Catch
Finally
fs.Close()
End Try
Finally
fs.Dispose()
End Try
End Sub 'DecryptFile
'/ summary
'/ 对文件内容进行DES解密，加密后覆盖掉原来的文件
'/ /summary
'/ param name="sourceFile"待解密的文件的绝对路径/param
Overloads Public Sub DecryptFile(sourceFile As String)
DecryptFile(sourceFile, sourceFile)
End Sub 'DecryptFile
End Class 'DES
End Namespace 'ZU14
对文本文件加密
Dim des As New ZU14.DES()
des.IV = "abcd哈哈笑"
des.Key = "必须八位"
'加密
des.EncryptFile("d:\a.txt", "d:\b.txt")
'解密
des.DecryptFile("d:\b.txt")
VB.NET程序加密问题在FormLoad事件里，写如下代码：
If MsgBox("是否打开程序?", MsgBoxStyle.OkCancel) = MsgBoxResult.Cancel Then
End
End If
大概方法是这样，要想加密码的话，将MsgBox()换成你自己写的对话框。