<%
 '--------------------------------------
 ' COCOON Disk Manager v3 -- MD5 Function
 '
 ' 經典 MD5 算法的ASP實現
 '                      -- 摘自某國外網站
 '--------------------------------------
 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(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
 End Function
%>