制作登陆行为时可能需要用到MD5加密用户密码,使用ASP实现这个功能比其他语言稍微麻烦一点,但是也是可行的.

核心代码:

<%
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32

Private m_lOnBits(30)
Private m_l2Power(30)

Private 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
  ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
    Err.Raise 6
  End If

If (lValue And m_l2Power(31 - iShiftBits)) Then
    LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
  Else
    LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
  End If
End Function

Private 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
  ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
    Err.Raise 6
  End If
 
  RShift = (lValue And &H7FFFFFFE)  m_l2Power(iShiftBits)

If (lValue And &H80000000) Then
    RShift = (RShift Or (&H40000000  m_l2Power(iShiftBits - 1)))
  End If
End Function

Private Function RotateLeft(lValue, iShiftBits)
  RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function

Private Function AddUnsigned(lX, lY)
  Dim lX4
  Dim lY4
  Dim lX8
  Dim lY8
  Dim 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

Private Function md5_F(x, y, z)
  md5_F = (x And y) Or ((Not x) And z)
End Function

Private Function md5_G(x, y, z)
  md5_G = (x And z) Or (y And (Not z))
End Function

Private Function md5_H(x, y, z)
  md5_H = (x Xor y Xor z)
End Function

Private Function md5_I(x, y, z)
  md5_I = (y Xor (x Or (Not z)))
End Function

Private 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

Private 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

Private 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

Private 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

Private Function ConvertToWordArray(sMessage)
  Dim lMessageLength
  Dim lNumberOfWords
  Dim lWordArray()
  Dim lBytePosition
  Dim lByteCount
  Dim lWordCount
 
  Const MODULUS_BITS = 512
  Const CONGRUENT_BITS = 448
 
  lMessageLength = Len(sMessage)
 
  lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS)  BITS_TO_A_BYTE))  (MODULUS_BITS  BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS  BITS_TO_A_WORD)
  ReDim lWordArray(lNumberOfWords - 1)
 
  lBytePosition = 0
  lByteCount = 0
  Do Until lByteCount >= lMessageLength
    lWordCount = lByteCount  BYTES_TO_A_WORD
    lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
    lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
    lByteCount = lByteCount + 1
  Loop

lWordCount = lByteCount  BYTES_TO_A_WORD
  lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)

lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
  lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
 
  ConvertToWordArray = lWordArray
End Function

Private Function WordToHex(lValue)
  Dim lByte
  Dim lCount
 
  For lCount = 0 To 3
    lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
    WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
  Next
End Function

Public Function MD5(sMessage)
  m_lOnBits(0) = CLng(1)
  m_lOnBits(1) = CLng(3)
  m_lOnBits(2) = CLng(7)
  m_lOnBits(3) = CLng(15)
  m_lOnBits(4) = CLng(31)
  m_lOnBits(5) = CLng(63)
  m_lOnBits(6) = CLng(127)
  m_lOnBits(7) = CLng(255)
  m_lOnBits(8) = CLng(511)
  m_lOnBits(9) = CLng(1023)
  m_lOnBits(10) = CLng(2047)
  m_lOnBits(11) = CLng(4095)
  m_lOnBits(12) = CLng(8191)
  m_lOnBits(13) = CLng(16383)
  m_lOnBits(14) = CLng(32767)
  m_lOnBits(15) = CLng(65535)
  m_lOnBits(16) = CLng(131071)
  m_lOnBits(17) = CLng(262143)
  m_lOnBits(18) = CLng(524287)
  m_lOnBits(19) = CLng(1048575)
  m_lOnBits(20) = CLng(2097151)
  m_lOnBits(21) = CLng(4194303)
  m_lOnBits(22) = CLng(8388607)
  m_lOnBits(23) = CLng(16777215)
  m_lOnBits(24) = CLng(33554431)
  m_lOnBits(25) = CLng(67108863)
  m_lOnBits(26) = CLng(134217727)
  m_lOnBits(27) = CLng(268435455)
  m_lOnBits(28) = CLng(536870911)
  m_lOnBits(29) = CLng(1073741823)
  m_lOnBits(30) = CLng(2147483647)
 
  m_l2Power(0) = CLng(1)
  m_l2Power(1) = CLng(2)
  m_l2Power(2) = CLng(4)
  m_l2Power(3) = CLng(8)
  m_l2Power(4) = CLng(16)
  m_l2Power(5) = CLng(32)
  m_l2Power(6) = CLng(64)
  m_l2Power(7) = CLng(128)
  m_l2Power(8) = CLng(256)
  m_l2Power(9) = CLng(512)
  m_l2Power(10) = CLng(1024)
  m_l2Power(11) = CLng(2048)
  m_l2Power(12) = CLng(4096)
  m_l2Power(13) = CLng(8192)
  m_l2Power(14) = CLng(16384)
  m_l2Power(15) = CLng(32768)
  m_l2Power(16) = CLng(65536)
  m_l2Power(17) = CLng(131072)
  m_l2Power(18) = CLng(262144)
  m_l2Power(19) = CLng(524288)
  m_l2Power(20) = CLng(1048576)
  m_l2Power(21) = CLng(2097152)
  m_l2Power(22) = CLng(4194304)
  m_l2Power(23) = CLng(8388608)
  m_l2Power(24) = CLng(16777216)
  m_l2Power(25) = CLng(33554432)
  m_l2Power(26) = CLng(67108864)
  m_l2Power(27) = CLng(134217728)
  m_l2Power(28) = CLng(268435456)
  m_l2Power(29) = CLng(536870912)
  m_l2Power(30) = CLng(1073741824)

Dim x
  Dim k
  Dim AA
  Dim BB
  Dim CC
  Dim DD
  Dim a
  Dim b
  Dim c
  Dim d
 
  Const S11 = 7
  Const S12 = 12
  Const S13 = 17
  Const S14 = 22
  Const S21 = 5
  Const S22 = 9
  Const S23 = 14
  Const S24 = 20
  Const S31 = 4
  Const S32 = 11
  Const S33 = 16
  Const S34 = 23
  Const S41 = 6
  Const S42 = 10
  Const S43 = 15
  Const S44 = 21

x = ConvertToWordArray(sMessage)
 
  a = &H67452301
  b = &HEFCDAB89
  c = &H98BADCFE
  d = &H10325476

For k = 0 To UBound(x) Step 16
    AA = a
    BB = b
    CC = c
    DD = d
 
    md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
    md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
    md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
    md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
    md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
    md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
    md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
    md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
    md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
    md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
    md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
    md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
    md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
    md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
    md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
    md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
 
    md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
    md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
    md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
    md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
    md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
    md5_GG d, a, b, c, x(k + 10), S22, &H2441453
    md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
    md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
    md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
    md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
    md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
    md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
    md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
    md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
    md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
    md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
     
    md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
    md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
    md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
    md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
    md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
    md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
    md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
    md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
    md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
    md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
    md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
    md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
    md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
    md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
    md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
    md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
 
    md5_II a, b, c, d, x(k + 0), S41, &HF4292244
    md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
    md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
    md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
    md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
    md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
    md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
    md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
    md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
    md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
    md5_II c, d, a, b, x(k + 6), S43, &HA3014314
    md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
    md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
    md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
    md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
    md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
 
    a = AddUnsigned(a, AA)
    b = AddUnsigned(b, BB)
    c = AddUnsigned(c, CC)
    d = AddUnsigned(d, DD)
  Next
 
  MD5=LCase(WordToHex(b) & WordToHex(c))
End Function
%>

使用方法:

1. 将以上代码另存为 md5.asp

2. 在登陆页面 login.asp 使用md5

(1) 页首引入md5.asp
<!--#include file="md5.asp" -->

(2) 对登陆表单添加登陆行为,注意红色部分代码
... ... ...
... ... ...

<%
Dim login__strUserID
login__strUserID = "x"
if (Request.Form("UserID") <> "") then login__strUserID = Request.Form("UserID")
%> <%
Dim login__strPassword
login__strPassword = "1"
if (Request.Form("Password") <> "") then login__strPassword = Request.Form("Password")
%> <%
set login = Server.CreateObject("ADODB.Recordset")
login.ActiveConnection = MM_qwqw_STRING
login.Source = "SELECT * FROM Reg WHERE User = '" + Replace(login__strUserID, "'", "''") + "' AND Pass = '" + md5(trim(replace(login__strPassword, "'", "''"))) + "'"
login.CursorType = 0
login.CursorLocation = 2
login.LockType = 3
login.Open()
login_numRows = 0
%>
... ... ...
... ... ...

3. 在注册页面使用 md5

(1) 页首引入md5.asp
<!--#include file="md5.asp" -->

(2) 使用command插入记录,插入前对密码加密,注意红色部分代码
... ... ...
... ... ...
<%
if(Request.Form("Pass") <> "") then Command_pass = md5(Request.Form("Pass"))
%>
<%
set Command = Server.CreateObject("ADODB.Command")
Command.ActiveConnection = MM_qwqw_STRING
Command.CommandText = "INSERT INTO Reg (User, Pass) VALUES ('" + Replace(Command_User, "'", "''") + "','" + Replace(Command_pass, "'", "''") + "') "
Command.CommandType = 1
Command.CommandTimeout = 0
Command.Prepared = true
Command.Execute()
Response.Redirect "ok.asp"
else
Response.Redirect "error.asp"
End If
%>
... ... ...
... ... ...

总结: 页面中引入md5.asp 然后对目标字符串使用md5()即可.