Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load
End Sub
Private Sub btnEnter_Click(sender As Object, e As EventArgs) Handles btnEnEnter.Click
If txtKey.Text.Trim.Length <> 8 Then
MsgBox("Key請設定為8位數!")
Exit Sub
End If
txtPassword.BackColor = Color.LightGreen
txtENPassword.BackColor = Color.White
txtPassword.Text = Decrypt(txtENPassword.Text.Trim, txtKey.Text.Trim)
End Sub
Private Sub btnDeEnter_Click(sender As Object, e As EventArgs) Handles btnDeEnter.Click
If txtKey.Text.Trim.Length <> 8 Then
MsgBox("Key請設定為8位數!")
Exit Sub
End If
txtENPassword.BackColor = Color.LightGreen
txtPassword.BackColor = Color.White
txtENPassword.Text = Encrypt(txtPassword.Text.Trim, txtKey.Text.Trim)
End Sub
Private Sub btnClean_Click(sender As Object, e As EventArgs) Handles btnClean.Click
txtENPassword.Text = ""
txtPassword.Text = ""
txtPassword.BackColor = Color.White
txtENPassword.BackColor = Color.White
End Sub
#Region "字串解密"
Public Function Decrypt(ByVal vsToDecrypt As String, ByVal vsKey As String) As String
Try
Dim des As New System.Security.Cryptography.DESCryptoServiceProvider()
''把字符串放入byte數組
Dim len As Integer
len = vsToDecrypt.Length / 2 - 1
Dim inputByteArray(len) As Byte
Dim x, i As Integer
For x = 0 To len
i = Convert.ToInt32(vsToDecrypt.Substring(x * 2, 2), 16)
inputByteArray(x) = CType(i, Byte)
Next
''建立加密對象的密鑰和偏移量，此值重要，不能修改
des.Key = System.Text.ASCIIEncoding.ASCII.GetBytes(vsKey)
des.IV = System.Text.ASCIIEncoding.ASCII.GetBytes(vsKey)
Dim ms As New System.IO.MemoryStream()
Dim cs As New System.Security.Cryptography.CryptoStream(ms, des.CreateDecryptor, System.Security.Cryptography.CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Return System.Text.Encoding.Default.GetString(ms.ToArray)
Catch ex As Exception
Return ""
End Try
End Function
#End Region
#Region "字串加密"
Public Function Encrypt(ByVal vsToEncrypt As String, ByVal vsKey As String) As String
Dim des As New System.Security.Cryptography.DESCryptoServiceProvider()
Dim inputByteArray() As Byte
inputByteArray = System.Text.Encoding.Default.GetBytes(vsToEncrypt)
''建立加密對象的密鑰和偏移量
''原文使用ASCIIEncoding.ASCII方法的GetBytes方法
''使得輸入密碼必須輸入英文文本
des.Key = System.Text.ASCIIEncoding.ASCII.GetBytes(vsKey)
des.IV = System.Text.ASCIIEncoding.ASCII.GetBytes(vsKey)
''寫二進制數組到加密流
''(把內存流中的內容全部寫入)
Dim ms As New System.IO.MemoryStream()
Dim cs As New System.Security.Cryptography.CryptoStream(ms, des.CreateEncryptor, System.Security.Cryptography.CryptoStreamMode.Write)
''寫二進制數組到加密流
''(把內存流中的內容全部寫入)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
''建立輸出字符串
Dim ret As New System.Text.StringBuilder()
Dim b As Byte
For Each b In ms.ToArray()
ret.AppendFormat("{0:X2}", b)
Next
Return ret.ToString()
End Function
#End Region
End Class