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349 lines
13 KiB
349 lines
13 KiB
Imports System.IO
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Module MD5_Crypt
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'Attribute VB_Name = "MD5_Crypt"
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'Option Explicit On
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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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'
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' NOTE - JDM 5/23/2007
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' (Research indicates this code is Licensed for free use)
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'
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Private Const OFFSET_4 = 4294967296.0#
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Private Const MAXINT_4 = 2147483647
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Private State(4) As Long
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Dim ByteCounter As Long
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Dim 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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Dim M_RegistryA As String
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Dim M_RegistryB As String
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Dim M_RegistryC As String
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Dim M_RegistryD As String
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Property RegistryA As String
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Get
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Return M_RegistryA
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End Get
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Set(value As String)
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M_RegistryA = State(1)
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End Set
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End Property
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Property RegistryB As String
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Get
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Return M_RegistryB
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End Get
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Set(value As String)
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M_RegistryB = State(2)
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End Set
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End Property
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Property RegistryC As String
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Get
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Return M_RegistryC
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End Get
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Set(value As String)
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M_RegistryC = State(3)
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End Set
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End Property
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Property RegistryD As String
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Get
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Return M_RegistryD
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End Get
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Set(value As String)
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M_RegistryD = State(4)
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End Set
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End Property
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Public Function DigestStrToHexStr(ByVal 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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Try
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Dim fInfo As New System.IO.FileInfo(InFile)
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Dim numBytes As Long = fInfo.Length
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Dim fs As New FileStream(InFile, FileMode.Open, FileAccess.Read)
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Dim br As New System.IO.BinaryReader(fs)
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Dim bytes As Byte() = br.ReadBytes(CInt(numBytes))
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br.Close()
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fs.Close()
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MD5Init()
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MD5Transform(bytes)
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ByteCounter = bytes.Count Mod 64
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MD5Final()
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DigestFileToHexStr = GetValues()
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Catch ex As Exception
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DigestFileToHexStr = ""
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Exit Function
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End Try
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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 Integer, 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(1732584193.0#)
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State(2) = UnsignedToLong(4023233417.0#)
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State(3) = UnsignedToLong(2562383102.0#)
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State(4) = UnsignedToLong(271733878.0#)
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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(InputLen As Long, InputBuffer() As Byte)
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Dim II As Integer, i As Integer, 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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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 Sub
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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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Private Sub MD5Transform(Buffer() As Byte)
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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) * 256.0# + InputBuffer(intByteIndex + 2) * 65536.0# + InputBuffer(intByteIndex + 3) * 16777216.0#
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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(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
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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(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
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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(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
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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(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
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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 * 65536.0#) + (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 * 65536.0#) + (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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End Module
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