Question

求一个简单短小的VB加密算法,每段要有解释

Answer 1

Public Function StringEnDeCodecn(strSource As String, MA) As String '该函数只对中西文起到加密作用 '参数为：源文件，密码 On Error GoTo ErrEnDeCode Dim X As Single Dim CHARNUM As Long, RANDOMINTEGER As Integer Dim SINGLECHAR As String * 1 Dim strTmp As String If MA < 0 Then MA = MA * (-1) End If X = Rnd(-MA) For i = 1 To Len(strSource) Step 1 '取单字节内容 SINGLECHAR = Mid(strSource, i, 1) CHARNUM = Asc(SINGLECHAR) g: RANDOMINTEGER = Int(127 * Rnd) If RANDOMINTEGER < 30 Or RANDOMINTEGER > 100 Then GoTo g CHARNUM = CHARNUM Xor RANDOMINTEGER strTmp = strTmp & Chr(CHARNUM) Next i StringEnDeCodecn = strTmp Exit Function ErrEnDeCode: StringEnDeCodecn = "" MsgBox Err.Number & "\" & Err.Description End Function Private Sub Command1_Click() tmp1 = StringEnDeCodecn(Text1.Text, 75) Text2.Text = tmp1 End Sub 窗体放两个文本框Text1,Text2和一个按钮Command1。 使用上面代码可以把Text1中的内容加密，显示在Text2中。 要解密直接把Text2的内容复制到Text1中，再次点击按钮Command1，解密后的内容会显示在Text2中。