Option Explicit '= '= Class Constants 'Private Const OFFSET_4 4294967296# Private Const MAXINT_4 = 2147483647 Private Const S11 = 7 Private Const S12 = 12 Private Const S13 = 17 Private Const S14 = 22 Private Const S21 = 5 Private Const S22 = 9 Private Const S23 = 14 Private Const S24 = 20 Private Const S31 = 4 Private Const S32 = 11 Private Const S33 = 16 Private Const S34 = 23 Private Const S41 = 6 Private Const S42 = 10 Private Const S43 = 15 Private Const S44 = 21 '= '= Class Variables '= Private State(4) As Long Private ByteCounter As Long Private ByteBuffer(63) As Byte '= '= Class Properties '= Property Get RegisterA() As String RegisterA = State(1) End Property Property Get RegisterB() As String RegisterB = State(2) End Property Property Get RegisterC() As String RegisterC = State(3) End Property Property Get RegisterD() As String RegisterD = State(4) End Property '= '= Class Functions '= ' ' Function to quickly digest a file into a hex string ' Public Function DigestFileToHexStr(FileName As String) As String Open FileName For Binary Access Read As #1 MD5Init Do While Not EOF(1) Get #1, , ByteBuffer If Loc(1) < LOF(1) Then ByteCounter = ByteCounter + 64 MD5Transform ByteBuffer End If Loop ByteCounter = ByteCounter + (LOF(1) Mod 64) Close #1 MD5Final DigestFileToHexStr = GetValues End Function ' ' Function to digest a text string and output the result as a string ' of hexadecimal characters. ' Public Function DigestStrToHexStr(SourceString As String) As String MD5Init MD5Update Len(SourceString), StringToArray(SourceString) MD5Final DigestStrToHexStr = GetValues End Function ' ' A utility function which converts a string into an array of ' bytes. ' Private Function StringToArray(InString As String) As Byte() Dim I As Integer Dim bytBuffer() As Byte ReDim bytBuffer(Len(InString)) For I = 0 To Len(InString) - 1 bytBuffer(I) = Asc(Mid(InString, I + 1, 1)) Next I StringToArray = bytBuffer End Function ' ' Concatenate the four state vaules into one string ' Public Function GetValues() As String GetValues = LongToString(State(1)) & LongToString(State(2)) & LongToString(State(3)) & LongToString(State(4)) End Function ' ' Convert a Long to a Hex string ' Private Function LongToString(Num As Long) As String Dim A As Byte Dim B As Byte Dim C As Byte Dim d As Byte A = Num And &HFF& If A < 16 Then LongToString = "0" & Hex(A) Else LongToString = Hex(A) End If B = (Num And &HFF00&) \ 256 If B < 16 Then LongToString = LongToString & "0" & Hex(B) Else LongToString = LongToString & Hex(B) End If C = (Num And &HFF0000) \ 65536 If C < 16 Then LongToString = LongToString & "0" & Hex(C) Else LongToString = LongToString & Hex(C) End If If Num < 0 Then d = ((Num And &H7F000000) \ 16777216) Or &H80& Else d = (Num And &HFF000000) \ 16777216 End If If d < 16 Then LongToString = LongToString & "0" & Hex(d) Else LongToString = LongToString & Hex(d) End If End Function ' ' Initialize the class ' This must be called before a digest calculation is started ' Public Sub MD5Init() ByteCounter = 0 State(1) = UnsignedToLong(1732584193#) State(2) = UnsignedToLong(4023233417#) State(3) = UnsignedToLong(2562383102#) State(4) = UnsignedToLong(271733878#) End Sub ' ' MD5 Final ' Public Sub MD5Final() Dim dblBits As Double Dim padding(72) As Byte Dim lngBytesBuffered As Long padding(0) = &H80 dblBits = ByteCounter * 8 ' Pad out lngBytesBuffered = ByteCounter Mod 64 If lngBytesBuffered <= 56 Then MD5Update 56 - lngBytesBuffered, padding Else MD5Update 120 - ByteCounter, padding End If padding(0) = UnsignedToLong(dblBits) And &HFF& padding(1) = UnsignedToLong(dblBits) \ 256 And &HFF& padding(2) = UnsignedToLong(dblBits) \ 65536 And &HFF& padding(3) = UnsignedToLong(dblBits) \ 16777216 And &HFF& padding(4) = 0 padding(5) = 0 padding(6) = 0 padding(7) = 0 MD5Update 8, padding End Sub ' ' Break up input stream into 64 byte chunks ' Public Sub MD5Update(InputLen As Long, InputBuffer() As Byte) Dim II As Integer Dim I As Integer Dim J As Integer Dim K As Integer Dim lngBufferedBytes As Long Dim lngBufferRemaining As Long Dim lngRem As Long lngBufferedBytes = ByteCounter Mod 64 lngBufferRemaining = 64 - lngBufferedBytes ByteCounter = ByteCounter + InputLen ' Use up old buffer results first If InputLen >= lngBufferRemaining Then For II = 0 To lngBufferRemaining - 1 ByteBuffer(lngBufferedBytes + II) = InputBuffer(II) Next II MD5Transform ByteBuffer lngRem = (InputLen) Mod 64 ' The transfer is a multiple of 64 lets do some transformations For I = lngBufferRemaining To InputLen - II - lngRem Step 64 For J = 0 To 63 ByteBuffer(J) = InputBuffer(I + J) Next J MD5Transform ByteBuffer Next I lngBufferedBytes = 0 Else I = 0 End If ' Buffer any remaining input For K = 0 To InputLen - I - 1 ByteBuffer(lngBufferedBytes + K) = InputBuffer(I + K) Next K End Sub ' ' MD5 Transform ' Private Sub MD5Transform(buffer() As Byte) Dim X(16) As Long Dim A As Long Dim B As Long Dim C As Long Dim d As Long A = State(1) B = State(2) C = State(3) d = State(4) Decode 64, X, buffer ' Round 1 FF A, B, C, d, X(0), S11, -680876936 FF d, A, B, C, X(1), S12, -389564586 FF C, d, A, B, X(2), S13, 606105819 FF B, C, d, A, X(3), S14, -1044525330 FF A, B, C, d, X(4), S11, -176418897 FF d, A, B, C, X(5), S12, 1200080426 FF C, d, A, B, X(6), S13, -1473231341 FF B, C, d, A, X(7), S14, -45705983 FF A, B, C, d, X(8), S11, 1770035416 FF d, A, B, C, X(9), S12, -1958414417 FF C, d, A, B, X(10), S13, -42063 FF B, C, d, A, X(11), S14, -1990404162 FF A, B, C, d, X(12), S11, 1804603682 FF d, A, B, C, X(13), S12, -40341101 FF C, d, A, B, X(14), S13, -1502002290 FF B, C, d, A, X(15), S14, 1236535329 ' Round 2 GG A, B, C, d, X(1), S21, -165796510 GG d, A, B, C, X(6), S22, -1069501632 GG C, d, A, B, X(11), S23, 643717713 GG B, C, d, A, X(0), S24, -373897302 GG A, B, C, d, X(5), S21, -701558691 GG d, A, B, C, X(10), S22, 38016083 GG C, d, A, B, X(15), S23, -660478335 GG B, C, d, A, X(4), S24, -405537848 GG A, B, C, d, X(9), S21, 568446438 GG d, A, B, C, X(14), S22, -1019803690 GG C, d, A, B, X(3), S23, -187363961 GG B, C, d, A, X(8), S24, 1163531501 GG A, B, C, d, X(13), S21, -1444681467 GG d, A, B, C, X(2), S22, -51403784 GG C, d, A, B, X(7), S23, 1735328473 GG B, C, d, A, X(12), S24, -1926607734 ' Round 3 HH A, B, C, d, X(5), S31, -378558 HH d, A, B, C, X(8), S32, -2022574463 HH C, d, A, B, X(11), S33, 1839030562 HH B, C, d, A, X(14), S34, -35309556 HH A, B, C, d, X(1), S31, -1530992060 HH d, A, B, C, X(4), S32, 1272893353 HH C, d, A, B, X(7), S33, -155497632 HH B, C, d, A, X(10), S34, -1094730640 HH A, B, C, d, X(13), S31, 681279174 HH d, A, B, C, X(0), S32, -358537222 HH C, d, A, B, X(3), S33, -722521979 HH B, C, d, A, X(6), S34, 76029189 HH A, B, C, d, X(9), S31, -640364487 HH d, A, B, C, X(12), S32, -421815835 HH C, d, A, B, X(15), S33, 530742520 HH B, C, d, A, X(2), S34, -995338651 ' Round 4 II A, B, C, d, X(0), S41, -198630844 II d, A, B, C, X(7), S42, 1126891415 II C, d, A, B, X(14), S43, -1416354905 II B, C, d, A, X(5), S44, -57434055 II A, B, C, d, X(12), S41, 1700485571 II d, A, B, C, X(3), S42, -1894986606 II C, d, A, B, X(10), S43, -1051523 II B, C, d, A, X(1), S44, -2054922799 II A, B, C, d, X(8), S41, 1873313359 II d, A, B, C, X(15), S42, -30611744 II C, d, A, B, X(6), S43, -1560198380 II B, C, d, A, X(13), S44, 1309151649 II A, B, C, d, X(4), S41, -145523070 II d, A, B, C, X(11), S42, -1120210379 II C, d, A, B, X(2), S43, 718787259 II B, C, d, A, X(9), S44, -343485551 State(1) = LongOverflowAdd(State(1), A) State(2) = LongOverflowAdd(State(2), B) State(3) = LongOverflowAdd(State(3), C) State(4) = LongOverflowAdd(State(4), d) ' /* Zeroize sensitive information. '*/ ' MD5_memset ((POINTER)x, 0, sizeof (x)); End Sub Private Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte) Dim intDblIndex As Integer Dim intByteIndex As Integer Dim dblSum As Double intDblIndex = 0 For intByteIndex = 0 To Length - 1 Step 4 dblSum = InputBuffer(intByteIndex) + _ InputBuffer(intByteIndex + 1) * 256# + _ InputBuffer(intByteIndex + 2) * 65536# + _ InputBuffer(intByteIndex + 3) * 16777216# OutputBuffer(intDblIndex) = UnsignedToLong(dblSum) intDblIndex = intDblIndex + 1 Next intByteIndex End Sub ' ' FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. ' Rotation is separate from addition to prevent recomputation. ' 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 A = LongOverflowAdd4(A, (B And C) Or (Not (B) And d), X, ac) A = LongLeftRotate(A, S) A = LongOverflowAdd(A, B) End Function 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 A = LongOverflowAdd4(A, (B And d) Or (C And Not (d)), X, ac) A = LongLeftRotate(A, S) A = LongOverflowAdd(A, B) End Function 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 A = LongOverflowAdd4(A, B Xor C Xor d, X, ac) A = LongLeftRotate(A, S) A = LongOverflowAdd(A, B) End Function 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 A = LongOverflowAdd4(A, C Xor (B Or Not (d)), X, ac) A = LongLeftRotate(A, S) A = LongOverflowAdd(A, B) End Function ' ' Rotate a long to the right ' Function LongLeftRotate(Value As Long, bits As Long) As Long Dim lngSign As Long Dim lngI As Long bits = bits Mod 32 If bits 0 Then LongLeftRotate Value: Exit Function For lngI = 1 To bits lngSign = Value And &HC0000000 Value = (Value And &H3FFFFFFF) * 2 Value = Value Or ((lngSign < 0) And 1) Or (CBool(lngSign And _ &H40000000) And &H80000000) Next LongLeftRotate = Value End Function ' ' Function to add two unsigned numbers together as in C. ' Overflows are ignored! ' Private Function LongOverflowAdd(Val1 As Long, Val2 As Long) As Long Dim lngHighWord As Long Dim lngLowWord As Long Dim lngOverflow As Long lngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) lngOverflow = lngLowWord \ 65536 lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + ((Val2 And &HFFFF0000) \ 65536) + lngOverflow) And &HFFFF& LongOverflowAdd = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&)) End Function ' ' Function to add two unsigned numbers together as in C. ' Overflows are ignored! ' Private Function LongOverflowAdd4(Val1 As Long, Val2 As Long, val3 As Long, val4 As Long) As Long Dim lngHighWord As Long Dim lngLowWord As Long Dim lngOverflow As Long lngLowWord = (Val1 And &HFFFF&) + (Val2 And &HFFFF&) + (val3 And &HFFFF&) + (val4 And &HFFFF&) lngOverflow = lngLowWord \ 65536 lngHighWord = (((Val1 And &HFFFF0000) \ 65536) + _ ((Val2 And &HFFFF0000) \ 65536) + _ ((val3 And &HFFFF0000) \ 65536) + _ ((val4 And &HFFFF0000) \ 65536) + _ lngOverflow) And &HFFFF& LongOverflowAdd4 = UnsignedToLong((lngHighWord * 65536#) + (lngLowWord And &HFFFF&)) End Function ' ' Convert an unsigned double into a long ' Private Function UnsignedToLong(Value As Double) As Long If Value < 0 Or Value >= OFFSET_4 Then Error 6 ' Overflow If Value <= MAXINT_4 Then UnsignedToLong = Value Else UnsignedToLong = Value - OFFSET_4 End If End Function ' ' Convert a long to an unsigned Double ' Private Function LongToUnsigned(Value As Long) As Double If Value < 0 Then LongToUnsigned = Value + OFFSET_4 Else LongToUnsigned = Value End If End Function
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