QzoneTalk/clsMD5.cls

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "clsMD5"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
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


Private State(4) As Long
Private ByteCounter As Long
Private ByteBuffer(63) As Byte

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

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


Public Function DigestStrToHexStr(SourceString As String) As String
    MD5Init
    MD5Update Len(SourceString), StringToArray(SourceString)
    MD5Final
    DigestStrToHexStr = GetValues
End Function


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

Public Function GetValues() As String
    GetValues = LongToString(State(1)) & LongToString(State(2)) & LongToString(State(3)) & LongToString(State(4))
End Function


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

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

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

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

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

Private Function UnsignedToLong(value As Double) As Long
    If value < 0 Or value >= OFFSET_4 Then Error 6
    If value <= MAXINT_4 Then
        UnsignedToLong = value
    Else
        UnsignedToLong = value - OFFSET_4
    End If
End Function

Private Function LongToUnsigned(value As Long) As Double
    If value < 0 Then
        LongToUnsigned = value + OFFSET_4
    Else
        LongToUnsigned = value
    End If
End Function