如何保护我的VB应用程序源代码，使用加密技术？

VB加密源码可以通过使用Visual Basic的内置函数和外部加密库来实现。

在VB（Visual Basic）中，实现加密的源码可以通过多种方式完成，具体取决于你选择的加密算法，以下是几种常见的VB加密方法及其详细代码示例：

AES 加密和解密

AES（Advanced Encryption Standard）是一种常用的对称加密算法，适用于字符串和文件的加密与解密，以下是一个使用AES进行字符串和文件加密解密的示例：

函数结构

'加密字符串
Public Function EncryptStr(ByVal EnStr As String, ByVal pwd As String, ByVal KeyBit As Long, ByVal BlockBit As Long, ByVal HEX As Boolean) As String
    '...
End Function
'解密字符串
Public Function DecryptStr(ByVal DeStr As String, ByVal pwd As String, ByVal KeyBit As Long, ByVal BlockBit As Long, ByVal HEX As Boolean) As String
    '...
End Function

完整代码示例

Option Explicit
Private m_Rijndael As Object
Public Sub Main()
    Dim plaintext As String
    Dim password As String
    Dim encrypted As String
    Dim decrypted As String
    
    plaintext = "Hello World"
    password = "mypassword"
    
    Set m_Rijndael = CreateObject("System.Security.Cryptography.RijndaelManaged")
    
    encrypted = EncryptStr(plaintext, password, 256, 128, False)
    decrypted = DecryptStr(encrypted, password, 256, 128, False)
    
    MsgBox "Original: " & plaintext & vbCrLf & "Encrypted: " & encrypted & vbCrLf & "Decrypted: " & decrypted
End Sub
Public Function EncryptStr(ByVal EnStr As String, ByVal pwd As String, ByVal KeyBit As Long, ByVal BlockBit As Long, ByVal HEX As Boolean) As String
    Dim pass() As Byte
    Dim plaintext() As Byte
    Dim ciphertext() As Byte
    Dim KeyBits As Long
    Dim BlockBits As Long
    Dim EnString As String
    Dim PassWd As String
    Dim SFHEX As Boolean
    
    EnString = EnStr
    PassWd = pwd
    KeyBits = KeyBit
    BlockBits = BlockBit
    SFHEX = HEX
    
    If Len(EnString) = 0 Then
        MsgBox "加密字符串为空"
        Exit Function
    End If
    
    If Len(PassWd) = 0 Then
        MsgBox "没有设置加密密码"
        Exit Function
    End If
    
    If SFHEX = False Then
        pass = StrConv(pwd, vbFromUnicode)
        plaintext = StrConv(EnString, vbFromUnicode)
        ReDim Preserve pass(31)
    Else
        If HexDisplayRev(pwd, pass) <> (KeyBits  8) Then
            pass = StrConv(pwd, vbFromUnicode)
            ReDim Preserve pass(31)
        End If
        If HexDisplayRev(EnString, plaintext) = 0 Then
            MsgBox "加密字符串不是HEX数据"
            Exit Function
        End If
    End If
    
    m_Rijndael.KeySize = KeyBits  8
    m_Rijndael.BlockSize = BlockBits  8
    m_Rijndael.Mode = CipherMode.CBC
    m_Rijndael.Padding = PaddingMode.PKCS7
    m_Rijndael.GenerateIV()
    
    m_Rijndael.Key = pass
    m_Rijndael.IV = m_Rijndael.IV
    
    ciphertext = m_Rijndael.CreateEncryptor().TransformFinalBlock(plaintext, 0, plaintext.Length)
    EncryptStr = Convert.ToBase64String(ciphertext)
End Function
Public Function DecryptStr(ByVal DeStr As String, ByVal pwd As String, ByVal KeyBit As Long, ByVal BlockBit As Long, ByVal HEX As Boolean) As String
    Dim pass() As Byte
    Dim plaintext() As Byte
    Dim ciphertext() As Byte
    Dim KeyBits As Long
    Dim BlockBits As Long
    Dim DeString, PassWd As String
    Dim SFHEX As Boolean
    
    DeString = DeStr
    PassWd = pwd
    KeyBits = KeyBit
    BlockBits = BlockBit
    SFHEX = HEX
    
    If Len(DeString) = 0 Then
        MsgBox "解密字符串为空"
        Exit Function
    End If
    
    If Len(PassWd) = 0 Then
        MsgBox "没有设置解密密码"
        Exit Function
    End If
    
    If SFHEX = False Then
        pass = StrConv(PassWd, vbFromUnicode)
        ciphertext = Convert.FromBase64String(DeString)
        ReDim Preserve pass(31)
    Else
        If HexDisplayRev(PassWd, pass) <> (KeyBits  8) Then
            pass = StrConv(PassWd, vbFromUnicode)
            ReDim Preserve pass(31)
        End If
        If HexDisplayRev(DeString, ciphertext) = 0 Then
            MsgBox "解密字符串不是HEX数据"
            Exit Function
        End If
    End If
    
    m_Rijndael.KeySize = KeyBits  8
    m_Rijndael.BlockSize = BlockBits  8
    m_Rijndael.Mode = CipherMode.CBC
    m_Rijndael.Padding = PaddingMode.PKCS7
    m_Rijndael.GenerateIV()
    
    m_Rijndael.Key = pass
    m_Rijndael.IV = m_Rijndael.IV
    
    plaintext = m_Rijndael.CreateDecryptor().TransformFinalBlock(ciphertext, 0, ciphertext.Length)
    DecryptStr = Convert.ToBase64String(plaintext)
End Function

VBA 代码动态解密插件

对于VBA（Visual Basic for Applications）代码，可以利用外部插件进行动态解密和执行，以下是一个使用VBA插件进行动态解密的示例：

Sub SampleEncryptVBA()
    Dim oAdd As Object, obj As Variant
    Dim modulename$, vbafilefullpath$, ret$
    '建立VBA动态调用
    On Error Resume Next
    Set oAdd = GetObject(, "SmartIndenterVBE.Connect")
    If Err <> 0 Then
        MsgBox "请按AltF11进入一次VBE之后再运行宏！"
        Exit Sub
    End If
    Set obj = oAdd.Instance
    Call obj.SetExcelApp(Application)
    '要运行的代码文件
    vbafilefullpath = ThisWorkbook.Path & Application.PathSeparator & "Encryptedemo.txt"
    '运行VBA函数，参数：文件名，文件密钥，文件编码，函数名，函数参数1，函数参数2，函数参数3...（超过五个请使用不定参数）
    ret = obj.RunVBAFunction(vbafilefullpath, "abc", True, "ReturnRangeValue", Range("A1"))
    MsgBox ret
End Sub

文本文件加密和解密

对于文本文件的加密和解密，可以使用简单的异或算法：

加密程序：

SoureFileName = App.Path & "liu.txt" '原文件路径
DesFileName = App.Path & "zhang.txt" '加密后的文件路径
Dim PassWord As String, PassLength As Integer
PassWord = "123" '密码
Dim Buff1 As String, Buff2 As String, Ch1 As String, Ch2 As String
PassLength = Len(Password)
Open SoureFileName For Input As #1
Open DesFileName For Output As #2
While Not EOF(1)
    Buff1 = Input(PassLength, #1)
    For i = 1 To PassLength
        Ch1 = Mid$(Buff1, i, 1)
        Ch2 = Mid$(PassWord, i, 1)
        Ch1 = Chr$(Asc(Ch1) Xor Asc(Ch2) + 10)
        Buff2 = Buff2 + Ch1
    Next i
    Print #2, Buff2
Next i
Close #1
Close #2

解密程序：

SoureFileName = App.Path & "zhang.txt" '加密后的文件路径
DesFileName = App.Path & "liu.txt" '原文件路径
Dim PassWord As String, PassLength As Integer
PassWord = "123" '密码
Dim Buff1 As String, Buff2 As String, Ch1 As String, Ch2 As String
PassLength = Len(Password)
Open SoureFileName For Input As #1
Open DesFileName For Output As #2
While Not EOF(1)
    Buff1 = Input(PassLength, #1)
    For i = 1 To PassLength
        Ch1 = Mid$(Buff1, i, 1)
        Ch2 = Mid$(PassWord, i, 1)
        Ch1 = Chr$(Asc(Ch1)  10 Xor Asc(Ch2))
        Buff2 = Buff2 + Ch1
    Next i
    Print #2, Buff2
Next i
Close #1
Close #2

DES 加密和解密

DES（Data Encryption Standard）是一种经典的对称加密算法，适用于字符串和文件的加密与解密，以下是一个使用DES进行加密和解密的示例：

函数结构：

'3DES加/解密函数说明：无返回值，参数：输入字节数组m_bit(),输出字节数组e_bit(),元素个数为8的倍数，可选输入bFlag：2为解密，其它或缺省为加密。
Sub Encrypt3Des_ArrToArr(m_bit() As Byte, e_bit() As Byte, Optional bFlag As Byte = 1)
    '...
End Sub

完整代码示例：

Option Explicit
Private ip(63) As Byte, ip_1(63) As Byte, e(47) As Byte '数据变换表、扩展置换表、S盒选择表等变量声明...（省略部分内容）...
Private key_n1(15, 7) As Byte '密钥1，key_n2(15, 7) As Byte '密钥2...（省略部分内容）...
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long) 'Windows API函数声明...（省略部分内容）...
Sub SetKey(K_Bit() As Byte) '设置3DES加/解密的密钥...（省略部分内容）...End Sub '根据密钥生成子密钥...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分内容）...End Sub '3DES加/解密...（省略部分 content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/解密...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）...End Sub '3DES加/密 text ...（省略 part content）..

到此，以上就是小编对于“vb加密源码”的问题就介绍到这了，希望介绍的几点解答对大家有用，有任何问题和不懂的，欢迎各位朋友在评论区讨论，给我留言。

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如何保护我的VB应用程序源代码，使用加密技术？

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