MD5的VB类模块源码

那个网上的MD5.BAS我研究了下,有严重问题.只好另找了个自已改了下.

在窗体中调用时如下:

set c1=new class 'class 为你存的类模快名

text1.text=md5_string_calc(sourcestring)

类模块源码如下:

Option Explicit

' Visual Basic MD5 Implementation

' Robert Hubley and David Midkiff (mdj2023@hotmail.com)

' modify by simonyan, Support chinese

' 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.

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 Md5_String_Calc(SourceString As String) As String

MD5Init

MD5Update LenB(StrConv(SourceString, vbFromUnicode)), StringToArray(SourceString)

MD5Final

Md5_String_Calc = GetValues

End Function

Public Function Md5_File_Calc(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

Md5_File_Calc = GetValues

End Function

Private Function StringToArray(InString As String) As Byte()

Dim I As Integer, bytBuffer() As Byte

ReDim bytBuffer(LenB(StrConv(InString, vbFromUnicode)))

bytBuffer = StrConv(InString, vbFromUnicode)

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 （出处：赢政天下收集整理）

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