VB6.0中实现MD5加密算法代码
来源:优易学  2011-9-13 8:35:21   【优易学:中国教育考试门户网】   资料下载   IT书店

  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

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