Imports System.IO
Module MD5_Crypt
    'Attribute VB_Name = "MD5_Crypt"
    'Option Explicit On

    ' Visual Basic MD5 Implementation
    ' Robert Hubley and David MidkiFF ((mdj2023@hotmail.com)
    '
    ' Standard MD5 implementation optimised for the Visual Basic environment.
    ' Conforms to all standards and can be used in digital signature or password
    ' protection related schemes.
    '
    ' NOTE - JDM 5/23/2007
    ' (Research indicates this code is Licensed for free use)
    '

    Private Const OFFSET_4 = 4294967296.0#
    Private Const MAXINT_4 = 2147483647
    Private State(4) As Long
    Dim ByteCounter As Long
    Dim 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

    Dim M_RegistryA As String
    Dim M_RegistryB As String
    Dim M_RegistryC As String
    Dim M_RegistryD As String
    Property RegistryA As String
        Get
            Return M_RegistryA
        End Get
        Set(value As String)
            M_RegistryA = State(1)
        End Set
    End Property

    Property RegistryB As String
        Get
            Return M_RegistryB
        End Get
        Set(value As String)
            M_RegistryB = State(2)
        End Set
    End Property
    Property RegistryC As String
        Get
            Return M_RegistryC
        End Get
        Set(value As String)
            M_RegistryC = State(3)
        End Set
    End Property
    Property RegistryD As String
        Get
            Return M_RegistryD
        End Get
        Set(value As String)
            M_RegistryD = State(4)
        End Set
    End Property



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

    Public Function DigestFileToHexStr(InFile As String) As String
        Try
            Dim fInfo As New System.IO.FileInfo(InFile)
            Dim numBytes As Long = fInfo.Length
            Dim fs As New FileStream(InFile, FileMode.Open, FileAccess.Read)
            Dim br As New System.IO.BinaryReader(fs)
            Dim bytes As Byte() = br.ReadBytes(CInt(numBytes))
            br.Close()
            fs.Close()

            MD5Init()

            MD5Transform(bytes)

            ByteCounter = bytes.Count Mod 64


            MD5Final()

            DigestFileToHexStr = GetValues()

        Catch ex As Exception
            DigestFileToHexStr = ""
            Exit Function

        End Try
    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(1732584193.0#)
        State(2) = UnsignedToLong(4023233417.0#)
        State(3) = UnsignedToLong(2562383102.0#)
        State(4) = UnsignedToLong(271733878.0#)
    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

    Dim X(16) As Long, A As Long, B As Long, C As Long, D As Long
    Private Sub MD5Transform(Buffer() As Byte)


        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) * 256.0# + InputBuffer(intByteIndex + 2) * 65536.0# + InputBuffer(intByteIndex + 3) * 16777216.0#
            OutputBuffer(intDblIndex) = UnsignedToLong(dblSum)
            intDblIndex = intDblIndex + 1
        Next intByteIndex
    End Sub

    Private Function FF(ByRef A As Long, ByRef B As Long, ByRef C As Long, ByRef D As Long, ByRef X As Long, ByRef S As Long, ByRef 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(ByRef A As Long, ByRef B As Long, ByRef C As Long, ByRef D As Long, ByRef X As Long, ByRef S As Long, ByRef 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(ByRef A As Long, ByRef B As Long, ByRef C As Long, ByRef D As Long, ByRef X As Long, ByRef S As Long, ByRef 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(ByRef A As Long, ByRef B As Long, ByRef C As Long, ByRef D As Long, ByRef X As Long, ByRef S As Long, ByRef 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 * 65536.0#) + (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 * 65536.0#) + (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




End Module