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ASP MD5代码如何运作？

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行业动态
2025-03-02
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ASPMD5是一种用于生成和验证 MD5哈希值的算法。MD5（Message Digest Algorithm 5）是一种广泛使用的加密哈希函数，可以产生一个128位的哈希值，通常用32位十六进制数字表示。

在ASP中实现MD5加密，通常需要使用到MD5算法，以下是详细的解释和示例代码：

MD5算法

MD5（Message Digest Algorithm 5）是一种广泛使用的加密哈希函数，它可以将任意长度的数据转换为一个固定长度（128位，即32个十六进制字符）的哈希值，这种转换是单向的，意味着从MD5哈希值无法直接恢复原始数据，MD5常用于验证数据完整性，但在安全要求较高的场景下，由于其存在碰撞破绽，已不推荐用于加密敏感信息。

ASP中实现MD5加密的方法

在ASP中，可以使用第三方库或内置对象来实现MD5加密，以下是两种常见的方法：

ASP MD5代码如何运作？

方法一：使用ActiveX对象（适用于老版本ASP）

在老版本的ASP中，可以通过创建ActiveX对象来实现MD5加密，这种方法需要引用一个支持MD5算法的ActiveX控件或DLL文件，以下是一个简化的示例代码：

ASP MD5代码如何运作？

<!--#include file="md5.asp"-->
<%
Dim objMD5, strInput, strOutput
Set objMD5 = Server.CreateObject("YourMD5Library.MD5") ' 替换为实际的MD5库路径
strInput = "Hello, World!"
strOutput = objMD5.EncryptString(strInput)
Response.Write("MD5 Hash: " & strOutput)
Set objMD5 = Nothing
%>

上述代码中的YourMD5Library.MD5是一个占位符，您需要将其替换为实际使用的MD5库的路径或名称，这种方法可能因服务器配置和权限问题而受到限制。

方法二：使用VBScript编写MD5算法（适用于无外部库的情况）

ASP MD5代码如何运作？

如果您无法使用外部库，也可以在ASP中使用VBScript手动实现MD5算法，以下是一个简化的VBScript实现示例：

<%
Function LShift(lValue, iShiftBits)
    If iShiftBits = 0 Then
        LShift = lValue
        Exit Function
    ElseIf iShiftBits = 31 Then
        If lValue And 1 Then
            LShift = &H80000000
        Else
            LShift = 0
        End If
        Exit Function
    End If
    If (lValue And &H7FFFFFFF)  (2 ^ (31 iShiftBits)) Then
        LShift = ((lValue And ((2 ^ (31 iShiftBits)) 1))  (2 ^ iShiftBits)) Or &H80000000
    Else
        LShift = ((lValue And ((2 ^ (31 iShiftBits)) 1))  (2 ^ iShiftBits))
    End If
End Function
Function RShift(lValue, iShiftBits)
    If iShiftBits = 0 Then
        RShift = lValue
        Exit Function
    ElseIf iShiftBits = 31 Then
        If lValue And &H80000000 Then
            RShift = 1
        Else
            RShift = 0
        End If
        Exit Function
    End If
    RShift = (lValue And &H7FFFFFFE)  (2 ^ iShiftBits)
    If (lValue And &H80000000) Then
        RShift = (RShift Or (&H40000000  (2 ^ (iShiftBits 1))))
    End If
End Function
Function RotateLeft(lValue, iShiftBits)
    RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 iShiftBits))
End Function
Function AddUnsigned(lX, lY)
    Dim lX4, lY4, lX8, lY8, lResult
    lX8 = lX And &H80000000
    lY8 = lY And &H80000000
    lX4 = lX And &H40000000
    lY4 = lY And &H40000000
    lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
    If lX4 And lY4 Then
        lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
    ElseIf lX4 Or lY4 Then
        If lResult And &H40000000 Then
            lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
        Else
            lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
        End If
    Else
        lResult = lResult Xor lX8 Xor lY8
    End If
    AddUnsigned = lResult
End Function
Function MD5_F(x, y, z)
    MD5_F = (x And y) Or ((Not x) And z)
End Function
Function MD5_G(x, y, z)
    MD5_G = (x And z) Or (y And (Not z))
End Function
Function MD5_H(x, y, z)
    MD5_H = (x Xor y Xor z)
End Function
Function MD5_I(x, y, z)
    MD5_I = (y Xor (x Or (Not z)))
End Function
Sub MD5_FF(a, b, c, d, x, s, ac)
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(MD5_F(b, c, d), x), ac))
    a = RotateLeft(a, s)
    a = AddUnsigned(a, b)
End Sub
Sub MD5_GG(a, b, c, d, x, s, ac)
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(MD5_G(b, c, d), x), ac))
    a = RotateLeft(a, s)
    a = AddUnsigned(a, b)
End Sub
Sub MD5_HH(a, b, c, d, x, s, ac)
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(MD5_H(b, c, d), x), ac))
    a = RotateLeft(a, s)
    a = AddUnsigned(a, b)
End Sub
Sub MD5_II(a, b, c, d, x, s, ac)
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(MD5_I(b, c, d), x), ac))
    a = RotateLeft(a, s)
    a = AddUnsigned(a, b)
End Sub
Function ConvertToWordArray(sMessage)
    Dim lMessageLength, aMessage()
    ReDim aMessage(Len(sMessage)  4)
    For I = 1 To Len(sMessage)  4
        aMessage(I) = Asc(Mid(sMessage, (I 1)  4 + 1, 4))
    Next
End Function
Function MD5(sMessage)
    Dim aMessage(), lMessageLength, aHash(), i, j, lBlockCount, abBlock(), lIndex, lj, k, t, ll, w()
    Dim AA, BB, CC, DD, EE, FF, GG, HH, II
    Const D1 = &Hd76aa478
    Const D2 = &HE8c7b756
    Const D3 = &H242070db
    Const D4 = &C1bdceee
    Const D5 = &Hf57c0faf
    Const D6 = &H4787c62a
    Const D7 = &Ha8304613
    Const D8 = &HDFFB49F6
    Const D9 = &H8EB44A12
    Const D10 = &H674DEA74
    Const D11 = &HF6FB9DFD
    Const D12 = &H898BDBBF
    Const D13 = &HFECBDDC7D
    Const D14 = &H6942EF6A
    Const D15 = &H143145BE
    Const D16 = &HADB7159D
    Const D17 = &H9A332AA3A
    Const D18 = &HEDD831C9D
    Const D19 = &HD9D158FEF
    Const D20 = &HB10BEC21F
    Const D21 = &H6EBAB798D
    Const D22 = &HBC277A2E2
    Const D23 = &HA2898ABE33
    Const D24 = &HB7A8DA2CE3
    Const D25 = &H8EB67CA7EEE
    Const D26 = &HC96717A9D7D
    Const D27 = &HD9BA1EA11C9D2D
    Const D28 = &HE99FCDB3DDF2B6C5
    Const D29 = &H9dfbbcec6e947af3
    Const D30 = &Hca62c1d6d00ef938
    Const D31 = &Hd985e9c5147fb9df
    lMessageLength = Len(sMessage)
    aMessage = ConvertToWordArray(sMessage)
    lBlockCount = (lMessageLength  56) + 1
    ReDim abBlock(lBlockCount 1)
    For I = 0 To lBlockCount 1
        abBlock(I) = aMessage((I  16)) + (aMessage((I  16) + 1) << 8) + (aMessage((I  16) + 2) << 16) + (aMessage((I  16) + 3) << 24) + &H1010000  I + &HF6FB9DFD
    Next
    aHash = Array(D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31)
    For I = 0 To lBlockCount 1
        abBlock() = aHash()
        For j = 0 To 63 Step 4
            If j < 16 Then
                abBlock() = aMessage() + aHash() + &H9BDC06A79C4C5DD65F4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3D4EEBC3