332 lines
12 KiB
OpenEdge ABL
332 lines
12 KiB
OpenEdge ABL
VERSION 1.0 CLASS
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BEGIN
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MultiUse = -1 'True
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Persistable = 0 'NotPersistable
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DataBindingBehavior = 0 'vbNone
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DataSourceBehavior = 0 'vbNone
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MTSTransactionMode = 0 'NotAnMTSObject
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END
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Attribute VB_Name = "clsMD5"
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Attribute VB_GlobalNameSpace = False
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Attribute VB_Creatable = True
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Attribute VB_PredeclaredId = False
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Attribute VB_Exposed = False
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Option Explicit
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' Visual Basic MD5 Implementation
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' Robert Hubley and David Midkiff (mdj2023@hotmail.com)
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'
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' Standard MD5 implementation optimised for the Visual Basic environment.
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' Conforms to all standards and can be used in digital signature or password
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' protection related schemes.
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' http://www.vbforums.com/showthread.php?345542-Calculate-MD5-hash-of-a-file-resolved
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Private Const OFFSET_4 = 4294967296#
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Private Const MAXINT_4 = 2147483647
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Private State(4) As Long
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Private ByteCounter As Long
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Private ByteBuffer(63) As Byte
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Private Const S11 = 7
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Private Const S12 = 12
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Private Const S13 = 17
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Private Const S14 = 22
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Private Const S21 = 5
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Private Const S22 = 9
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Private Const S23 = 14
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Private Const S24 = 20
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Private Const S31 = 4
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Private Const S32 = 11
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Private Const S33 = 16
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Private Const S34 = 23
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Private Const S41 = 6
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Private Const S42 = 10
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Private Const S43 = 15
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Private Const S44 = 21
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Property Get RegisterA() As String
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RegisterA = State(1)
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End Property
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Property Get RegisterB() As String
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RegisterB = State(2)
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End Property
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Property Get RegisterC() As String
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RegisterC = State(3)
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End Property
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Property Get RegisterD() As String
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RegisterD = State(4)
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End Property
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Public Function DigestStrToHexStr(SourceString As String) As String
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MD5Init
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MD5Update Len(SourceString), StringToArray(SourceString)
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MD5Final
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DigestStrToHexStr = GetValues
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End Function
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Public Function DigestFileToHexStr(InFile As String) As String
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On Error GoTo Errorhandler
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GoSub begin
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Errorhandler:
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DigestFileToHexStr = ""
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Exit Function
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begin:
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Dim FileO As Integer
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FileO = FreeFile
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Call FileLen(InFile)
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Open InFile For Binary Access Read As #FileO
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MD5Init
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Do While Not EOF(FileO)
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Get #FileO, , ByteBuffer
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If Loc(FileO) < LOF(FileO) Then
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ByteCounter = ByteCounter + 64
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MD5Transform ByteBuffer
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End If
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Loop
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ByteCounter = ByteCounter + (LOF(FileO) Mod 64)
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Close #FileO
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MD5Final
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DigestFileToHexStr = GetValues
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End Function
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Private Function StringToArray(InString As String) As Byte()
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Dim i As Long, bytBuffer() As Byte
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ReDim bytBuffer(Len(InString))
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For i = 0 To Len(InString) - 1
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bytBuffer(i) = Asc(Mid$(InString, i + 1, 1))
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Next i
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StringToArray = bytBuffer
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End Function
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Public Function GetValues() As String
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GetValues = LongToString(State(1)) & LongToString(State(2)) & LongToString(State(3)) & LongToString(State(4))
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End Function
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Private Function LongToString(Num As Long) As String
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Dim a As Byte, b As Byte, C As Byte, D As Byte
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a = Num And &HFF&
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If a < 16 Then LongToString = "0" & Hex(a) Else LongToString = Hex(a)
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b = (Num And &HFF00&) \ 256
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If b < 16 Then LongToString = LongToString & "0" & Hex(b) Else LongToString = LongToString & Hex(b)
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C = (Num And &HFF0000) \ 65536
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If C < 16 Then LongToString = LongToString & "0" & Hex(C) Else LongToString = LongToString & Hex(C)
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If Num < 0 Then D = ((Num And &H7F000000) \ 16777216) Or &H80& Else D = (Num And &HFF000000) \ 16777216
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If D < 16 Then LongToString = LongToString & "0" & Hex(D) Else LongToString = LongToString & Hex(D)
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End Function
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Public Sub MD5Init()
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ByteCounter = 0
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State(1) = UnsignedToLong(1732584193#)
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State(2) = UnsignedToLong(4023233417#)
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State(3) = UnsignedToLong(2562383102#)
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State(4) = UnsignedToLong(271733878#)
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End Sub
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Public Sub MD5Final()
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Dim dblBits As Double, padding(72) As Byte, lngBytesBuffered As Long
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padding(0) = &H80
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dblBits = ByteCounter * 8
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lngBytesBuffered = ByteCounter Mod 64
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If lngBytesBuffered <= 56 Then MD5Update 56 - lngBytesBuffered, padding Else MD5Update 120 - ByteCounter, padding
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padding(0) = UnsignedToLong(dblBits) And &HFF&
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padding(1) = UnsignedToLong(dblBits) \ 256 And &HFF&
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padding(2) = UnsignedToLong(dblBits) \ 65536 And &HFF&
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padding(3) = UnsignedToLong(dblBits) \ 16777216 And &HFF&
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padding(4) = 0
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padding(5) = 0
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padding(6) = 0
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padding(7) = 0
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MD5Update 8, padding
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End Sub
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Public Sub MD5Update(ByVal InputLen As Long, InputBuffer() As Byte)
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Dim II As Integer, i As Long, j As Integer, k As Integer, lngBufferedBytes As Long, lngBufferRemaining As Long, lngRem As Long
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lngBufferedBytes = ByteCounter Mod 64
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lngBufferRemaining = 64 - lngBufferedBytes
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ByteCounter = ByteCounter + InputLen
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If InputLen >= lngBufferRemaining Then
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For II = 0 To lngBufferRemaining - 1
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ByteBuffer(lngBufferedBytes + II) = InputBuffer(II)
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Next II
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MD5Transform ByteBuffer
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lngRem = (InputLen) Mod 64
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For i = lngBufferRemaining To InputLen - II - lngRem Step 64
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For j = 0 To 63
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ByteBuffer(j) = InputBuffer(i + j)
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Next j
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MD5Transform ByteBuffer
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Next i
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lngBufferedBytes = 0
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Else
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i = 0
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End If
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If InputLen > 0 Then
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For k = 0 To InputLen - i - 1
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ByteBuffer(lngBufferedBytes + k) = InputBuffer(i + k)
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Next k
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End If
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End Sub
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Private Sub MD5Transform(Buffer() As Byte)
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Dim x(16) As Long, a As Long, b As Long, C As Long, D As Long
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a = State(1)
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b = State(2)
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C = State(3)
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D = State(4)
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Decode 64, x, Buffer
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FF a, b, C, D, x(0), S11, -680876936
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FF D, a, b, C, x(1), S12, -389564586
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FF C, D, a, b, x(2), S13, 606105819
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FF b, C, D, a, x(3), S14, -1044525330
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FF a, b, C, D, x(4), S11, -176418897
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FF D, a, b, C, x(5), S12, 1200080426
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FF C, D, a, b, x(6), S13, -1473231341
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FF b, C, D, a, x(7), S14, -45705983
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FF a, b, C, D, x(8), S11, 1770035416
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FF D, a, b, C, x(9), S12, -1958414417
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FF C, D, a, b, x(10), S13, -42063
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FF b, C, D, a, x(11), S14, -1990404162
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FF a, b, C, D, x(12), S11, 1804603682
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FF D, a, b, C, x(13), S12, -40341101
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FF C, D, a, b, x(14), S13, -1502002290
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FF b, C, D, a, x(15), S14, 1236535329
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GG a, b, C, D, x(1), S21, -165796510
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GG D, a, b, C, x(6), S22, -1069501632
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GG C, D, a, b, x(11), S23, 643717713
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GG b, C, D, a, x(0), S24, -373897302
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GG a, b, C, D, x(5), S21, -701558691
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GG D, a, b, C, x(10), S22, 38016083
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GG C, D, a, b, x(15), S23, -660478335
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GG b, C, D, a, x(4), S24, -405537848
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GG a, b, C, D, x(9), S21, 568446438
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GG D, a, b, C, x(14), S22, -1019803690
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GG C, D, a, b, x(3), S23, -187363961
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GG b, C, D, a, x(8), S24, 1163531501
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GG a, b, C, D, x(13), S21, -1444681467
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GG D, a, b, C, x(2), S22, -51403784
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GG C, D, a, b, x(7), S23, 1735328473
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GG b, C, D, a, x(12), S24, -1926607734
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HH a, b, C, D, x(5), S31, -378558
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HH D, a, b, C, x(8), S32, -2022574463
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HH C, D, a, b, x(11), S33, 1839030562
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HH b, C, D, a, x(14), S34, -35309556
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HH a, b, C, D, x(1), S31, -1530992060
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HH D, a, b, C, x(4), S32, 1272893353
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HH C, D, a, b, x(7), S33, -155497632
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HH b, C, D, a, x(10), S34, -1094730640
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HH a, b, C, D, x(13), S31, 681279174
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HH D, a, b, C, x(0), S32, -358537222
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HH C, D, a, b, x(3), S33, -722521979
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HH b, C, D, a, x(6), S34, 76029189
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HH a, b, C, D, x(9), S31, -640364487
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HH D, a, b, C, x(12), S32, -421815835
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HH C, D, a, b, x(15), S33, 530742520
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HH b, C, D, a, x(2), S34, -995338651
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II a, b, C, D, x(0), S41, -198630844
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II D, a, b, C, x(7), S42, 1126891415
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II C, D, a, b, x(14), S43, -1416354905
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II b, C, D, a, x(5), S44, -57434055
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II a, b, C, D, x(12), S41, 1700485571
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II D, a, b, C, x(3), S42, -1894986606
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II C, D, a, b, x(10), S43, -1051523
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II b, C, D, a, x(1), S44, -2054922799
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II a, b, C, D, x(8), S41, 1873313359
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II D, a, b, C, x(15), S42, -30611744
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II C, D, a, b, x(6), S43, -1560198380
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II b, C, D, a, x(13), S44, 1309151649
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II a, b, C, D, x(4), S41, -145523070
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II D, a, b, C, x(11), S42, -1120210379
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II C, D, a, b, x(2), S43, 718787259
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II b, C, D, a, x(9), S44, -343485551
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State(1) = LongOverflowAdd(State(1), a)
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State(2) = LongOverflowAdd(State(2), b)
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State(3) = LongOverflowAdd(State(3), C)
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State(4) = LongOverflowAdd(State(4), D)
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End Sub
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Private Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte)
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Dim intDblIndex As Integer, intByteIndex As Integer, dblSum As Double
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For intByteIndex = 0 To Length - 1 Step 4
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dblSum = InputBuffer(intByteIndex) + InputBuffer(intByteIndex + 1) * 256# + InputBuffer(intByteIndex + 2) * 65536# + InputBuffer(intByteIndex + 3) * 16777216#
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OutputBuffer(intDblIndex) = UnsignedToLong(dblSum)
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intDblIndex = intDblIndex + 1
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Next intByteIndex
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End Sub
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Private Function FF(a As Long, b As Long, C As Long, D As Long, x As Long, s As Long, ac As Long) As Long
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a = LongOverflowAdd4(a, (b And C) Or (Not (b) And D), x, ac)
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a = LongLeftRotate(a, s)
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a = LongOverflowAdd(a, b)
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End Function
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Private Function GG(a As Long, b As Long, C As Long, D As Long, x As Long, s As Long, ac As Long) As Long
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a = LongOverflowAdd4(a, (b And D) Or (C And Not (D)), x, ac)
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a = LongLeftRotate(a, s)
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a = LongOverflowAdd(a, b)
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End Function
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Private Function HH(a As Long, b As Long, C As Long, D As Long, x As Long, s As Long, ac As Long) As Long
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a = LongOverflowAdd4(a, b Xor C Xor D, x, ac)
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a = LongLeftRotate(a, s)
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a = LongOverflowAdd(a, b)
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End Function
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Private Function II(a As Long, b As Long, C As Long, D As Long, x As Long, s As Long, ac As Long) As Long
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a = LongOverflowAdd4(a, C Xor (b Or Not (D)), x, ac)
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a = LongLeftRotate(a, s)
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a = LongOverflowAdd(a, b)
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End Function
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Function LongLeftRotate(value As Long, Bits As Long) As Long
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Dim lngSign As Long, lngI As Long
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Bits = Bits Mod 32
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If Bits = 0 Then LongLeftRotate = value: Exit Function
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For lngI = 1 To Bits
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lngSign = value And &HC0000000
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value = (value And &H3FFFFFFF) * 2
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value = value Or ((lngSign < 0) And 1) Or (CBool(lngSign And &H40000000) And &H80000000)
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Next
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LongLeftRotate = value
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End Function
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Private Function LongOverflowAdd(Val1 As Long, Val2 As Long) As Long
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Dim lngHighWord As Long, lngLowWord As Long, lngOverflow As Long
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lngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&)
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lngOverflow = lngLowWord \ 65536
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lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + ((Val2 And &HFFFF0000) \ 65536) + lngOverflow) And &HFFFF&
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LongOverflowAdd = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&))
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End Function
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Private Function LongOverflowAdd4(Val1 As Long, Val2 As Long, val3 As Long, val4 As Long) As Long
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Dim lngHighWord As Long, lngLowWord As Long, lngOverflow As Long
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lngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) + (val3 And &HFFFF&) + (val4 And &HFFFF&)
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lngOverflow = lngLowWord \ 65536
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lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + ((Val2 And &HFFFF0000) \ 65536) + ((val3 And &HFFFF0000) \ 65536) + ((val4 And &HFFFF0000) \ 65536) + lngOverflow) And &HFFFF&
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LongOverflowAdd4 = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&))
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End Function
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Private Function UnsignedToLong(value As Double) As Long
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If value < 0 Or value >= OFFSET_4 Then Error 6
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If value <= MAXINT_4 Then UnsignedToLong = value Else UnsignedToLong = value - OFFSET_4
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End Function
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'Private Function LongToUnsigned(value As Long) As Double
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' If value < 0 Then LongToUnsigned = value + OFFSET_4 Else LongToUnsigned = value
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'End Function
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