md5加密运算是不可逆的，就是说不能通过那一串古古怪怪的东西算出它原始的样子。
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以下提供VB可用的16位和32位MD5加密函数代码：
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Private m_lOnBits(30)
Private m_l2Power(30)
Private Function LShift(lValue, iShiftBits)
If iShiftBits = 0 Then
LShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And 1 Then
LShift = H80000000
Else
LShift = 0
End If
Exit Function
ElseIf iShiftBits 0 Or iShiftBits 31 Then
Err.Raise 6
End If
If (lValue And m_l2Power(31 - iShiftBits)) Then
LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or H80000000
Else
LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function
Private Function RShift(lValue, iShiftBits)
If iShiftBits = 0 Then
RShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And H80000000 Then
RShift = 1
Else
RShift = 0
End If
Exit Function
ElseIf iShiftBits 0 Or iShiftBits 31 Then
Err.Raise 6
End If
RShift = (lValue And H7FFFFFFE) \ m_l2Power(iShiftBits)
If (lValue And H80000000) Then
RShift = (RShift Or (H40000000 \ m_l2Power(iShiftBits - 1)))
End If
End Function
Private Function RotateLeft(lValue, iShiftBits)
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function AddUnsigned(lX, lY)
Dim lX4
Dim lY4
Dim lX8
Dim lY8
Dim lResult
lX8 = lX And H80000000
lY8 = lY And H80000000
lX4 = lX And H40000000
lY4 = lY And H40000000
lResult = (lX And H3FFFFFFF) + (lY And H3FFFFFFF)
If lX4 And lY4 Then
lResult = lResult Xor H80000000 Xor lX8 Xor lY8
ElseIf lX4 Or lY4 Then
If lResult And H40000000 Then
lResult = lResult Xor HC0000000 Xor lX8 Xor lY8
Else
lResult = lResult Xor H40000000 Xor lX8 Xor lY8
End If
Else
lResult = lResult Xor lX8 Xor lY8
End If
AddUnsigned = lResult
End Function
Private Function md5_F(x, y, z)
md5_F = (x And y) Or ((Not x) And z)
End Function
Private Function md5_G(x, y, z)
md5_G = (x And z) Or (y And (Not z))
End Function
Private Function md5_H(x, y, z)
md5_H = (x Xor y Xor z)
End Function
Private Function md5_I(x, y, z)
md5_I = (y Xor (x Or (Not z)))
End Function
Private Sub md5_FF(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_GG(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_HH(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_II(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Function ConvertToWordArray(sMessage)
Dim lMessageLength
Dim lNumberOfWords
Dim lWordArray()
Dim lBytePosition
Dim lByteCount
Dim lWordCount
Const MODULUS_BITS = 512
Const CONGRUENT_BITS = 448
lMessageLength = Len(sMessage)
lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
ReDim lWordArray(lNumberOfWords - 1)
lBytePosition = 0
lByteCount = 0
Do Until lByteCount = lMessageLength
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
lByteCount = lByteCount + 1
Loop
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(H80, lBytePosition)
lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
ConvertToWordArray = lWordArray
End Function
Private Function WordToHex(lValue)
Dim lByte
Dim lCount
For lCount = 0 To 3
lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
WordToHex = WordToHex Right("0" Hex(lByte), 2)
Next
End Function
Public Function MD5(sMessage, stype)
m_lOnBits(0) = CLng(1)
m_lOnBits(1) = CLng(3)
m_lOnBits(2) = CLng(7)
m_lOnBits(3) = CLng(15)
m_lOnBits(4) = CLng(31)
m_lOnBits(5) = CLng(63)
m_lOnBits(6) = CLng(127)
m_lOnBits(7) = CLng(255)
m_lOnBits(8) = CLng(511)
m_lOnBits(9) = CLng(1023)
m_lOnBits(10) = CLng(2047)
m_lOnBits(11) = CLng(4095)
m_lOnBits(12) = CLng(8191)
m_lOnBits(13) = CLng(16383)
m_lOnBits(14) = CLng(32767)
m_lOnBits(15) = CLng(65535)
m_lOnBits(16) = CLng(131071)
m_lOnBits(17) = CLng(262143)
m_lOnBits(18) = CLng(524287)
m_lOnBits(19) = CLng(1048575)
m_lOnBits(20) = CLng(2097151)
m_lOnBits(21) = CLng(4194303)
m_lOnBits(22) = CLng(8388607)
m_lOnBits(23) = CLng(16777215)
m_lOnBits(24) = CLng(33554431)
m_lOnBits(25) = CLng(67108863)
m_lOnBits(26) = CLng(134217727)
m_lOnBits(27) = CLng(268435455)
m_lOnBits(28) = CLng(536870911)
m_lOnBits(29) = CLng(1073741823)
m_lOnBits(30) = CLng(2147483647)
m_l2Power(0) = CLng(1)
m_l2Power(1) = CLng(2)
m_l2Power(2) = CLng(4)
m_l2Power(3) = CLng(8)
m_l2Power(4) = CLng(16)
m_l2Power(5) = CLng(32)
m_l2Power(6) = CLng(64)
m_l2Power(7) = CLng(128)
m_l2Power(8) = CLng(256)
m_l2Power(9) = CLng(512)
m_l2Power(10) = CLng(1024)
m_l2Power(11) = CLng(2048)
m_l2Power(12) = CLng(4096)
m_l2Power(13) = CLng(8192)
m_l2Power(14) = CLng(16384)
m_l2Power(15) = CLng(32768)
m_l2Power(16) = CLng(65536)
m_l2Power(17) = CLng(131072)
m_l2Power(18) = CLng(262144)
m_l2Power(19) = CLng(524288)
m_l2Power(20) = CLng(1048576)
m_l2Power(21) = CLng(2097152)
m_l2Power(22) = CLng(4194304)
m_l2Power(23) = CLng(8388608)
m_l2Power(24) = CLng(16777216)
m_l2Power(25) = CLng(33554432)
m_l2Power(26) = CLng(67108864)
m_l2Power(27) = CLng(134217728)
m_l2Power(28) = CLng(268435456)
m_l2Power(29) = CLng(536870912)
m_l2Power(30) = CLng(1073741824)
Dim x
Dim k
Dim AA
Dim BB
Dim CC
Dim DD
Dim a
Dim b
Dim c
Dim d
Const S11 = 7
Const S12 = 12
Const S13 = 17
Const S14 = 22
Const S21 = 5
Const S22 = 9
Const S23 = 14
Const S24 = 20
Const S31 = 4
Const S32 = 11
Const S33 = 16
Const S34 = 23
Const S41 = 6
Const S42 = 10
Const S43 = 15
Const S44 = 21
x = ConvertToWordArray(sMessage)
a = H67452301
b = HEFCDAB89
c = H98BADCFE
d = H10325476
For k = 0 To UBound(x) Step 16
AA = a
BB = b
CC = c
DD = d
md5_FF a, b, c, d, x(k + 0), S11, HD76AA478
md5_FF d, a, b, c, x(k + 1), S12, HE8C7B756
md5_FF c, d, a, b, x(k + 2), S13, H242070DB
md5_FF b, c, d, a, x(k + 3), S14, HC1BDCEEE
md5_FF a, b, c, d, x(k + 4), S11, HF57C0FAF
md5_FF d, a, b, c, x(k + 5), S12, H4787C62A
md5_FF c, d, a, b, x(k + 6), S13, HA8304613
md5_FF b, c, d, a, x(k + 7), S14, HFD469501
md5_FF a, b, c, d, x(k + 8), S11, H698098D8
md5_FF d, a, b, c, x(k + 9), S12, H8B44F7AF
md5_FF c, d, a, b, x(k + 10), S13, HFFFF5BB1
md5_FF b, c, d, a, x(k + 11), S14, H895CD7BE
md5_FF a, b, c, d, x(k + 12), S11, H6B901122
md5_FF d, a, b, c, x(k + 13), S12, HFD987193
md5_FF c, d, a, b, x(k + 14), S13, HA679438E
md5_FF b, c, d, a, x(k + 15), S14, H49B40821
md5_GG a, b, c, d, x(k + 1), S21, HF61E2562
md5_GG d, a, b, c, x(k + 6), S22, HC040B340
md5_GG c, d, a, b, x(k + 11), S23, H265E5A51
md5_GG b, c, d, a, x(k + 0), S24, HE9B6C7AA
md5_GG a, b, c, d, x(k + 5), S21, HD62F105D
md5_GG d, a, b, c, x(k + 10), S22, H2441453
md5_GG c, d, a, b, x(k + 15), S23, HD8A1E681
md5_GG b, c, d, a, x(k + 4), S24, HE7D3FBC8
md5_GG a, b, c, d, x(k + 9), S21, H21E1CDE6
md5_GG d, a, b, c, x(k + 14), S22, HC33707D6
md5_GG c, d, a, b, x(k + 3), S23, HF4D50D87
md5_GG b, c, d, a, x(k + 8), S24, H455A14ED
md5_GG a, b, c, d, x(k + 13), S21, HA9E3E905
md5_GG d, a, b, c, x(k + 2), S22, HFCEFA3F8
md5_GG c, d, a, b, x(k + 7), S23, H676F02D9
md5_GG b, c, d, a, x(k + 12), S24, H8D2A4C8A
md5_HH a, b, c, d, x(k + 5), S31, HFFFA3942
md5_HH d, a, b, c, x(k + 8), S32, H8771F681
md5_HH c, d, a, b, x(k + 11), S33, H6D9D6122
md5_HH b, c, d, a, x(k + 14), S34, HFDE5380C
md5_HH a, b, c, d, x(k + 1), S31, HA4BEEA44
md5_HH d, a, b, c, x(k + 4), S32, H4BDECFA9
md5_HH c, d, a, b, x(k + 7), S33, HF6BB4B60
md5_HH b, c, d, a, x(k + 10), S34, HBEBFBC70
md5_HH a, b, c, d, x(k + 13), S31, H289B7EC6
md5_HH d, a, b, c, x(k + 0), S32, HEAA127FA
md5_HH c, d, a, b, x(k + 3), S33, HD4EF3085
md5_HH b, c, d, a, x(k + 6), S34, H4881D05
md5_HH a, b, c, d, x(k + 9), S31, HD9D4D039
md5_HH d, a, b, c, x(k + 12), S32, HE6DB99E5
md5_HH c, d, a, b, x(k + 15), S33, H1FA27CF8
md5_HH b, c, d, a, x(k + 2), S34, HC4AC5665
md5_II a, b, c, d, x(k + 0), S41, HF4292244
md5_II d, a, b, c, x(k + 7), S42, H432AFF97
md5_II c, d, a, b, x(k + 14), S43, HAB9423A7
md5_II b, c, d, a, x(k + 5), S44, HFC93A039
md5_II a, b, c, d, x(k + 12), S41, H655B59C3
md5_II d, a, b, c, x(k + 3), S42, H8F0CCC92
md5_II c, d, a, b, x(k + 10), S43, HFFEFF47D
md5_II b, c, d, a, x(k + 1), S44, H85845DD1
md5_II a, b, c, d, x(k + 8), S41, H6FA87E4F
md5_II d, a, b, c, x(k + 15), S42, HFE2CE6E0
md5_II c, d, a, b, x(k + 6), S43, HA3014314
md5_II b, c, d, a, x(k + 13), S44, H4E0811A1
md5_II a, b, c, d, x(k + 4), S41, HF7537E82
md5_II d, a, b, c, x(k + 11), S42, HBD3AF235
md5_II c, d, a, b, x(k + 2), S43, H2AD7D2BB
md5_II b, c, d, a, x(k + 9), S44, HEB86D391
a = AddUnsigned(a, AA)
b = AddUnsigned(b, BB)
c = AddUnsigned(c, CC)
d = AddUnsigned(d, DD)
Next
If stype = 32 Then
MD5 = LCase(WordToHex(a) WordToHex(b) WordToHex(c) WordToHex(d))
Else
MD5 = LCase(WordToHex(b) WordToHex(c))
End If
End Function
'下面是测试代码
Sub test()
MsgBox MD5("a", 16) '16位加密
MsgBox MD5("a", 32) '32位加密
End Sub
Public Function md5(ByVal a As String) As String
Dim tempmd5 As System.Security.Cryptography.MD5 = New System.Security.Cryptography.MD5CryptoServiceProvider()
Dim bytResult() As Byte = tempmd5.ComputeHash(System.Text.Encoding.Default.GetBytes(a))
Dim strResult As String = BitConverter.ToString(bytResult)
strResult = strResult.Replace("-", "")
Return strResult
End Function
如果要计算文件的就把参数改成字节数组就可以了，然后获取文件GetBytes（）传进去就可以了。
给一个bas模块文件你
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "ClsMD5"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
'*************************************************************************
'**模 块 名：ClsMD5
'**说 明：MD5相关计算
'**创 建 人：马大哈
'**日 期：2005年2月15日
'**版 本：V1.0
'*************************************************************************
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
MD5实际一种单向的算法，是散列，很多人认为是加密，实际有误
比如说winxp、win7各版本都有MD5值，那么是否可依据这个值还原出个正版的winxp或win7呢？
况且MD5“加密”的密钥长度又是多少呢?比如des的不同版本有64位、128位、192位等
下面是完整的类，可以设置任意密码
'DES及md5加密解密----添加引用中添加对system.web的引用。
Imports System.Security.Cryptography
Imports System
Imports System.Text
Imports System.Web
''' summary
''' DES加密类
''' /summary
''' remarks/remarks
Public Class DESEncrypt
Public Sub DESEncrypt()
End Sub
Public Shared Function Encrypt(ByVal Text As String) As String
Return Encrypt(Text, "12345678")
End Function
Public Shared Function Encrypt(ByVal Text As String, ByVal sKey As String) As String
Dim des As New DESCryptoServiceProvider()
Dim inputByteArray As Byte()
inputByteArray = Encoding.Default.GetBytes(Text)
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim ms As New System.IO.MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Dim ret As New StringBuilder()
Dim b As Byte
For Each b In ms.ToArray()
ret.AppendFormat("{0:X2}", b)
Next
Return ret.ToString()
End Function
Public Shared Function Decrypt(ByVal Text As String) As String
Return Decrypt(Text, "12345678")
End Function
Public Shared Function Decrypt(ByVal Text As String, ByVal sKey As String) As String
Dim des As New DESCryptoServiceProvider()
Dim len As Integer
len = Text.Length / 2
Dim inputByteArray(len - 1) As Byte
Dim x, i As Integer
For x = 0 To len - 1
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16)
inputByteArray(x) = CType(i, Byte)
Next
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim ms As New System.IO.MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Return Encoding.Default.GetString(ms.ToArray())
End Function
End Class
'以下是调用方法
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click '加密
Dim str_Encrypt As String = DESEncrypt.Encrypt("你要加密的文本，可以是任意长度", "密码，可以很长，如果省略这个参数就是默认的12345678")
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click '解密
Dim str_Decrypt As String = DESEncrypt.Decrypt("你要解密的文本, 可以是任意长度", "加密时用到的密码，如果省略这个参数就是默认的12345678")
End Sub
注意参数，Text是密文。sKey是你的加密干扰符
Public Shared Function Decrypt(ByVal Text As String, ByVal sKey As String) As String
Dim provider As New DESCryptoServiceProvider()
Dim num As Integer = Text.Length \ 2
Dim buffer As Byte() = New Byte(num - 1) {}
For i As Integer = 0 To num - 1
Dim num3 As Integer = Convert.ToInt32(Text.Substring(i * 2, 2), H10)
buffer(i) = CByte(num3)
Next
provider.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
provider.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim stream As New MemoryStream()
Dim stream2 As New CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write)
stream2.Write(buffer, 0, buffer.Length)
stream2.FlushFinalBlock()
Return Encoding.[Default].GetString(stream.ToArray())
End Function
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