Ajuda com codigo encryptar MD5 em VB6

xxncsxx

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Posts: 49

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27-07-2014, 22:32

Boa noite galerinha do mal

Eu estou tendo um problema com um codigo em VB6, sei que muitos não terá humildade em ajudar mas tudo bem, agradeço desde ja quem ajudar. Agora deixando de bla bla bla

Eu tenho um codigo de encriptar em MD5 (pelo menos foi isso que consegui entender do codigo)
Vou postar o codigo e dizer o que entendi dele.

Class Module:

Código:

Option Explicit

Private Const OFFSET_4 = 4294967296#
Private Const MAXINT_4 = 2147483647
Private State(4) As Long
Private ByteCounter As Long
Private ByteBuffer(63) As Byte
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
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 DigestStrToHexStr(SourceString As String) As String
    MD5Init
    MD5Update Len(SourceString), StringToArray(SourceString)
    MD5Final
    DigestStrToHexStr = GetValues
End Function
Public Function DigestFileToHexStr(InFile As String) As String
On Error GoTo errorhandler
GoSub begin

errorhandler:
    DigestFileToHexStr = ""
    Exit Function
    
begin:
    Dim FileO As Integer
    FileO = FreeFile
    Call FileLen(InFile)
    Open InFile For Binary Access Read As #FileO
    MD5Init
    Do While Not EOF(FileO)
        Get #FileO, , ByteBuffer
        If Loc(FileO) < LOF(FileO) Then
            ByteCounter = ByteCounter + 64
            MD5Transform ByteBuffer
        End If
    Loop
    ByteCounter = ByteCounter + (LOF(FileO) Mod 64)
    Close #FileO
    MD5Final
    DigestFileToHexStr = GetValues
End Function
Private Function StringToArray(InString As String) As Byte()
    Dim I As Integer, 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, B As Byte, C As Byte, D As Byte
        A = Num And &HFF&
        If A < 16 Then LongToString = "0" & Hex(A) Else LongToString = Hex(A)
        B = (Num And &HFF00&) \ 256
        If B < 16 Then LongToString = LongToString & "0" & Hex(B) Else LongToString = LongToString & Hex(B)
        C = (Num And &HFF0000) \ 65536
        If C < 16 Then LongToString = LongToString & "0" & Hex(C) Else LongToString = LongToString & Hex(C)
        If Num < 0 Then D = ((Num And &H7F000000) \ 16777216) Or &H80& Else D = (Num And &HFF000000) \ 16777216
        If D < 16 Then LongToString = LongToString & "0" & Hex(D) Else LongToString = LongToString & Hex(D)
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

Public Sub MD5Final()
    Dim dblBits As Double, padding(72) As Byte, lngBytesBuffered As Long
    padding(0) = &H80
    dblBits = ByteCounter * 8
    lngBytesBuffered = ByteCounter Mod 64
    If lngBytesBuffered <= 56 Then MD5Update 56 - lngBytesBuffered, padding Else MD5Update 120 - ByteCounter, padding
    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
Public Sub MD5Update(InputLen As Long, InputBuffer() As Byte)
    Dim II As Integer, I As Integer, J As Integer, K As Integer, lngBufferedBytes As Long, lngBufferRemaining As Long, lngRem As Long

    lngBufferedBytes = ByteCounter Mod 64
    lngBufferRemaining = 64 - lngBufferedBytes
    ByteCounter = ByteCounter + InputLen

    If InputLen >= lngBufferRemaining Then
        For II = 0 To lngBufferRemaining - 1
            ByteBuffer(lngBufferedBytes + II) = InputBuffer(II)
        Next II
        MD5Transform ByteBuffer
        lngRem = (InputLen) Mod 64
        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
    For K = 0 To InputLen - I - 1
        ByteBuffer(lngBufferedBytes + K) = InputBuffer(I + K)
    Next K
End Sub
Private Sub MD5Transform(Buffer() As Byte)
    Dim X(16) As Long, A As Long, B As Long, C As Long, D As Long
    
    A = State(1)
    B = State(2)
    C = State(3)
    D = State(4)
    Decode 64, X, Buffer
    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

    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

    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

    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)
End Sub

Private Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte)
    Dim intDblIndex As Integer, intByteIndex As Integer, dblSum As Double
    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
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, 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, lngLowWord As Long, 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, lngLowWord As Long, 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 Function
Private Function LongToUnsigned(value As Long) As Double
    If value < 0 Then LongToUnsigned = value + OFFSET_4 Else LongToUnsigned = value
End Function

O que eu entendi:

1# Não consegui entender a utilidade dessa parte, para que eu usaria essa parte do codigo?

Código:

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

2# Esse pelo que entendi converte String para heximal, mas nao entendi como desencriptar heximal para string

Código:

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

3# Esse converte arquivos em Heximal, mas tbm nao achei como fazer de hexmal para string.

Código:

Public Function DigestFileToHexStr(InFile As String) As String
On Error GoTo errorhandler
GoSub begin

errorhandler:
    DigestFileToHexStr = ""
    Exit Function
    
begin:
    Dim FileO As Integer
    FileO = FreeFile
    Call FileLen(InFile)
    Open InFile For Binary Access Read As #FileO
    MD5Init
    Do While Not EOF(FileO)
        Get #FileO, , ByteBuffer
        If Loc(FileO) < LOF(FileO) Then
            ByteCounter = ByteCounter + 64
            MD5Transform ByteBuffer
        End If
    Loop
    ByteCounter = ByteCounter + (LOF(FileO) Mod 64)
    Close #FileO
    MD5Final
    DigestFileToHexStr = GetValues
End Function

4# Como o codigo diz, encripta de string para Array mas nao sei para que eu utilizo isso.

Código:

Private Function StringToArray(InString As String) As Byte()
    Dim I As Integer, 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

5# nao consegui entender .-.

Código:

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

6# Para que eu usaria isso?

Código:

Private Function LongToString(Num As Long) As String
        Dim A As Byte, B As Byte, C As Byte, D As Byte
        A = Num And &HFF&
        If A < 16 Then LongToString = "0" & Hex(A) Else LongToString = Hex(A)
        B = (Num And &HFF00&) \ 256
        If B < 16 Then LongToString = LongToString & "0" & Hex(B) Else LongToString = LongToString & Hex(B)
        C = (Num And &HFF0000) \ 65536
        If C < 16 Then LongToString = LongToString & "0" & Hex(C) Else LongToString = LongToString & Hex(C)
        If Num < 0 Then D = ((Num And &H7F000000) \ 16777216) Or &H80& Else D = (Num And &HFF000000) \ 16777216
        If D < 16 Then LongToString = LongToString & "0" & Hex(D) Else LongToString = LongToString & Hex(D)
End Function

7#Eu tbm nao entendi essa parte .-.

Código:

Public Sub MD5Init()
    ByteCounter = 0
    State(1) = UnsignedToLong(1732584193#)
    State(2) = UnsignedToLong(4023233417#)
    State(3) = UnsignedToLong(2562383102#)
    State(4) = UnsignedToLong(271733878#)
End Sub

8# o que seria isso exatamente?

Código:

Public Sub MD5Final()
    Dim dblBits As Double, padding(72) As Byte, lngBytesBuffered As Long
    padding(0) = &H80
    dblBits = ByteCounter * 8
    lngBytesBuffered = ByteCounter Mod 64
    If lngBytesBuffered <= 56 Then MD5Update 56 - lngBytesBuffered, padding Else MD5Update 120 - ByteCounter, padding
    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

9# Pq esse MD5 update? para que?

Código:

Public Sub MD5Update(InputLen As Long, InputBuffer() As Byte)
    Dim II As Integer, I As Integer, J As Integer, K As Integer, lngBufferedBytes As Long, lngBufferRemaining As Long, lngRem As Long

    lngBufferedBytes = ByteCounter Mod 64
    lngBufferRemaining = 64 - lngBufferedBytes
    ByteCounter = ByteCounter + InputLen

    If InputLen >= lngBufferRemaining Then
        For II = 0 To lngBufferRemaining - 1
            ByteBuffer(lngBufferedBytes + II) = InputBuffer(II)
        Next II
        MD5Transform ByteBuffer
        lngRem = (InputLen) Mod 64
        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
    For K = 0 To InputLen - I - 1
        ByteBuffer(lngBufferedBytes + K) = InputBuffer(I + K)
    Next K
End Sub

10# Sei que essa parte é importante, mas nao sei se preciso focar nessa parte do codigo.

Código:

Private Sub MD5Transform(Buffer() As Byte)
    Dim X(16) As Long, A As Long, B As Long, C As Long, D As Long
    
    A = State(1)
    B = State(2)
    C = State(3)
    D = State(4)
    Decode 64, X, Buffer
    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

    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

    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

    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)
End Sub

11# Essa eu acho que entendi! =) mas nao sei como eu chamaria essa funcao.

Código:

Private Sub Decode(Length As Integer, OutputBuffer() As Long, InputBuffer() As Byte)
    Dim intDblIndex As Integer, intByteIndex As Integer, dblSum As Double
    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

12#NÃo entedi o pq disso?

Código:

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

13# Nao sei para que isso tbm.

Código:

Function LongLeftRotate(value As Long, Bits As Long) As Long
    Dim lngSign As Long, 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

14#Isso eu preciso me preocupar?

Código:

Private Function LongOverflowAdd(Val1 As Long, Val2 As Long) As Long
    Dim lngHighWord As Long, lngLowWord As Long, 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, lngLowWord As Long, 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

15#Nao sei para que eu usaria isso

Código:

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

Desculpe a ignorância, eu fiz curso de VB basico e avancado, mas nao aprendi coisas desse tipo, entao por favor, nao me mande estudar, pq eu estou aqui para aprender coisas novas.

Eu coloquei em # para ficar mais facil para voces me ajudar. Ao responder, como em # + resposta, assim vou saber qual parte do codigo voces estao falando.

OBRIGADO.

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