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发表于 2007-6-6 00:06:26| 字数 9,827| - 中国–福建–泉州 电信/IDC机房
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Option Explicit
'使用方法:
'MsgBox DigestStrToHexStr("111")
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.
'
'The code following do not support the Chinese charactors
'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
'Another sub from web
Private Function StringToArray(InString As String) As Byte()
Dim bytBuffer() As Byte
bytBuffer = StrConv(InString, vbFromUnicode)
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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