ASP + Serv-u 实现FTP的代码(2)

     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)