求教这种是不是MD5编码,怎么编码和解码?2E3FAB4467222D89B8D0ACD979B66F9B

zxwdt618116 2014-06-27 02:19:37
有如下这三对一一对应字符, 前者这个数字如何编码就能得到后者呢?

后者看上去应该是32位MD5编码? 但是直接放到在线MD5解码倒过来解码解不出.

记得看过帖子of123大侠擅长密码学. 各种求.....^_^

不会编码和解码, 具体也许不知道会不会有口令之类加在里面. 我想要的是前者得到后者. 但是先倒过来,后者那个32位的编码能不能先解码出任何什么明文有意义的东西呢?这样好推测一下正向大致编码机制?

非常感谢!

11529536
2E3FAB4467222D89B8D0ACD979B66F9B

12527208
E41D4E6D4522D8E627E9152F9E7FE72F

11342746
72FD230F887C38B0A2372139F71BE9C2

...全文
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舉杯邀明月 2014-07-02
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MD5确实为“不可逆算法”,
基本上可以认定“别人的”算法不是直接计算MD5了。
楼主想“仿制算法”几乎不可能了。

这儿我顺便说一下的是,
楼主的MD5算法代码是在哪Copy的啊,
代码有问题吧?
你百度一下,有在线MD5工具,
你的算出来的结果跟它们一致吗?
最直接的,百度百科中介绍MD5算法,
后面有一些“标准结果”,
你的代码计算出来的是否正确?
我曾发布过一个MD5算法的贴子,
建议楼主看看。
我的那个,可以说是“经得起考验”的。
现在知道的问题是,计算文件MD5那个函数,只能用于2G以内的文件。
zxwdt618116 2014-07-02
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引用 15 楼 Chen8013 的回复:
好的. 非常感谢大侠! 我那个算出来和网上在线算出来的是一样的. 不过我只试了一个. 那估计是没点线索时猜不出来了. 多谢大侠!
taoguangye 2014-07-01
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没听说MD5可以解码的,呵呵,好孤陋寡闻哦
zxwdt618116 2014-07-01
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多谢大侠! 看来确实复杂. 搞不定......多谢!
引用 8 楼 of123 的回复:
不仅如此,在摘要算法协议中,还有一类是“有密钥的摘要算法”,即使用一个密钥对消息异或,然后再求 Hash 值。 密钥的长度小于消息时,一般是采用反复连接的方式。 因为 MD5 是单向的,反推密钥还是有一定困难。如果你确认是 MD5 算法,可以通过穷举法找出密钥,毕竟你的消息较短。
zxwdt618116 2014-07-01
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' ' 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 [/code]
zxwdt618116 2014-07-01
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非常感谢!! 我是后来网上搜来的一个vb6的代码算出的结果: [code=vb] '调用 Text1 = md5(Text2) '下为模块 Option Explicit 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 md5(SourceString As String) As String MD5Init MD5Update Len(SourceString), StringToArray(SourceString) MD5Final md5 = GetValues End Function ' ' A utility function which converts a string into an array of ' bytes. ' 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 ' ' 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
舉杯邀明月 2014-06-30
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另外,楼主计算MD5是怎样编码的?
我算出来的也没有与你算的相同的啊。

我这儿把你那3个数以文本来计算MD5:
11529536
UTF-8 :00AB2D8B51B4E8CEE31EE4222200B4A9
UTF16 :F10F04EA2A8073DDD5B45D75E51CB035

12527208
UTF-8 :DA5F497A4F2A5588FEB9CDD6E02FE486
UTF16 :DA54ACB4F9F46CEE5C41C272D043AE20

11342746
UTF-8 :AA38B1C5D94E16CCD63B01B0DF4B26DC
UTF16 :A1E786EEEF3D4D47193B105B88FE22F5
舉杯邀明月 2014-06-30
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今天在公司里,我编写了一段代码来试。
感觉它应该不是直接MD5出来的。
比如楼主的第一个: 11529536
文本格式按ANSI、UTF16编码,
四字节整数按40 ED AF 00、00 AF ED 40,
以及它的16进制编码文本以大写、小写、
加0x开头、加&H开头等等 非常多的组合方式,
计算出来的MD5没有与楼主说的一致的。
of123 2014-06-30
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不仅如此,在摘要算法协议中,还有一类是“有密钥的摘要算法”,即使用一个密钥对消息异或,然后再求 Hash 值。 密钥的长度小于消息时,一般是采用反复连接的方式。 因为 MD5 是单向的,反推密钥还是有一定困难。如果你确认是 MD5 算法,可以通过穷举法找出密钥,毕竟你的消息较短。
舉杯邀明月 2014-06-28
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看来我在4楼说的,你还没有明白是什么意思。
zxwdt618116 2014-06-28
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不是简单的MD5加密, 我试过了,结果对比如下, 不知道借大神慧眼能不能看出有什么规律?
11529536
md5:
C3BC54914FC279F8DDCA3B536185068D
人家的加密结果:
2E3FAB4467222D89B8D0ACD979B66F9B
 
12527208
md5:
6AD43160E4F007ADB42DFD77BA4DDC4D
人家的加密结果:
E41D4E6D4522D8E627E9152F9E7FE72F
 
11342746
md5:
51BB6141816149BEB2C1A43CB3400711
人家的加密结果:
72FD230F887C38B0A2372139F71BE9C2
zxwdt618116 2014-06-28
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引用 3 楼 Chen8013 的回复:
MD5算法是确定的, 你只要计算出该文本对应的MD5码跟它是否一致, 不就知道是不是MD5编码了吗!
多谢! vb怎么转MD5我都不会, 我去搜一下. 多谢!
舉杯邀明月 2014-06-27
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文本编码格式不同,计算出来的MD5也不同。
不过常用格式不外乎ANSI、UTF-8、UTF16
你的是纯数字,文本编码ANSI和UTF-8相同,
因此文本格式你只要试ANSI和UTF-16(这个就是VB6本身的String格式)这两种,
或者,外加这个值对应的Long值、Single、Double值的MD5

如果没有相符的,那也有可能是明文经某种“加密”变换后,再计算MD5。
如果别人是这样处理的,
相猜测别人的算法,就非常之难了。
舉杯邀明月 2014-06-27
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MD5算法是确定的,
你只要计算出该文本对应的MD5码跟它是否一致,
不就知道是不是MD5编码了吗!
zxwdt618116 2014-06-27
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引用 1 楼 of123 的回复:
MD5 是单向函数,怎么还解码?
哎呀 大侠来了.多谢! 是我表述有点凌乱了. 不是的, 我本意不是要解码, 而是想求解它的正向编码过程, 就是比如这个数字11529536 是怎么编码成这个的: 2E3FAB4467222D89B8D0ACD979B66F9B 这个是人家编码的, 我想知道它的编码机制. 我举的例子三组字符串就是一一对应的它的编码前后样子. 数字是编码前, 32位的字符串是编码后, 我也不知道是不是MD5还是什么. 完全没接触过MD5. 非常感谢解答!
of123 2014-06-27
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MD5 是单向函数,怎么还解码?

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