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tomasz86

Looking for a VBS script to generate MD5 of a file

47 posts in this topic

Does anyone know about any script which can generate MD5 of a file? I've searched in the Internet but haven't been able to find anything working. I did find this:

http://scriptbox.toll.at/index.php?showcontent=Calculate%20MD5%20Hash.vbs

and everything seems to work fine except for the fact that the hash generated by it is wrong :ph34r: (doesn't match the real MD5).

Basically speaking, I'm looking for a solution to calculate MD5 in Windows environment without relying on any 3rd party tools.

Edited by tomasz86
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I've been using FCIV and will probably continue to use it if I can't find any other solution. I'd like to use a VBS script instead of it since such a script can be created on the fly in Windows while FCIV has to be downloaded separately.

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Hum, this code might be a good start.

I've found that one in many different places. The problem is that it only works for text strings, not files... and I'm a complete zero when it comes to VBS so I've got no idea how to change / utilise it :(

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I've been using FCIV and will probably continue to use it if I can't find any other solution. I'd like to use a VBS script instead of it since such a script can be created on the fly in Windows while FCIV has to be downloaded separately.

Well, I don't see any issue in using a FREE (freely redistributable) MD5 calculator and "embed" it in a .script (i.e. creating it on the fly or more simply including it in the "main" download .zip or whatever). :unsure:

Point might be to find a no-frill one (tiny).

This one is a good candidate:

http://www.pc-tools.net/win32/md5sums/

The DSFOK dsfo.exe is MUCH smaller but unfortunately it is not redistributable "by itself".

Another point of interest would be WHY choosing MD5. (if the idea is a check for consistency MD5 might not be needed and a simpler hash like CRC32 might do)

jaclaz

Edited by jaclaz
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Well, I don't see any issue in using a FREE (freely redistributable) MD5 calculator and "embed" it in a .script (i.e. creating it on the fly or more simply including it in the "main" download .zip or whatever). :unsure:

Point might be to find a no-frill one (tiny).

Since I've already done MD5, SHA-1, and CRC-32 (and could rig more through the Windows API), would it be fruitful to cook up a quick exec for this (command-line and free to distribute of course)? Or at least post the proper API calls (i.e. source example) to get the MD5 out of them (assuming those can be done in VBScript - i.e. the source can be adapted)? If so, how should the MD5 be reported?

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Well, I don't see any issue in using a FREE (freely redistributable) MD5 calculator and "embed" it in a .script (i.e. creating it on the fly or more simply including it in the "main" download .zip or whatever). :unsure:

How could such an utility be created on the fly?

Another point of interest would be WHY choosing MD5. (if the idea is a check for consistency MD5 might not be needed and a simpler hash like CRC32 might do)

Unfortunately MD5 is a must since I need it mainly (but not only) for creating update.ver files for M$ hotfix installer which requires MD5 hash to verify files.

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I've found that one in many different places. The problem is that it only works for text strings, not files... and I'm a complete zero when it comes to VBS so I've got no idea how to change / utilise it :(

Me too, but I will tell you from experience in implementing it in other things (and reading that VBScript) that it will work as long as you present the entire data at once to the function. The problem is you really can't do that, so what you have to do is write multiple functions to process a limited buffer based on current state data that you save outside of the function and then finishes up the MD5 once you hit the end of the data. It would be a change of moderate complexity to someone who knows VBScript (I'm sure), but the problem for me is while I have done this in another language, my knowledge of VBScript is zero, so I couldn't say I could write the change there.

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I've tested the script which I mentioned in #1 a little bit more. It's very strange... There seems to be a bug in it somewhere because it does work for some files and doesn't work for others.

For example,

1. Empty file 1.txt has MD5 of d41d8cd98f00b204e9800998ecf8427e. The script is able to generate it correctly.

2. Now I add one line "abc" to the file. The calculated MD5 is now wrong.

3. I add a single space after abc ("abc "). Now the calculated MD5 is correct again... :blink:

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I know it's another external file, though it is small (only 49,152 bytes), but have you tried using md5sum.exe (Freeware) available here and here, and probably other places, too? [Open up a command window and type md5sum --help for command syntax info]

I also have another very small version of this, only about 2kb, but I can't find a link for it right now. I'd be glad to share it if you like, but I think I remember that it has a problem running on Win2K so didn't think it would be your first choice. Let me know if you want to check it out.

Cheers and Regards

Edited by bphlpt
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I know it's another external file, though it is small (only 49,152 bytes),

You must be joking, I pointed to a 28 Kb file which I thought being "huge" :ph34r: .

The mentioned dsfo.exe is around 6 Kb.

The 2 Kb sized one seems like the "right" thing, it would be nice if you could find it, maybe there is a version suitable fro Windows 2000.

jaclaz

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1. Empty file 1.txt has MD5 of d41d8cd98f00b204e9800998ecf8427e. The script is able to generate it correctly.

2. Now I add one line "abc" to the file. The calculated MD5 is now wrong.

3. I add a single space after abc ("abc "). Now the calculated MD5 is correct again... :blink:

This is how testing hash functions usually goes. You have to pick out a number of cases of files of different sizes and then test test and retest (and eliminate all potential of garbage, too). From looking at the script in #1 it seems like the way it's written it only works right if files are presented to it that are in multiples of 4 bytes. The MD5Decode function sticks out in this regard.

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The 2 Kb sized one seems like the "right" thing, it would be nice if you could find it, maybe there is a version suitable fro Windows 2000.

Probably ASM that calls the Windows API functions that will obtain a MD5 hash. But with storage and memory what it is, why quibble over a handful of bytes? Speaking of which, if you can do those in VBScript that's probably the best course.

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FWIW this is what the API calls look like when you use Delphi. Hope they can be adapted to VBScript.


function MD5_File(infile_name: string): string;
// Create digest of file with given Name
const
bufsize = 65536;
var
infile: THandle;
inbuffer: pointer;
amount_read: longint;
cbHashDataLen: Integer;
Digest: TMD5Digest;
hProv: TCryptProv;
hHash: TCryptHash;
begin
GetMem(inbuffer, bufsize);
infile := CreateFile(PChar(infile_name), GENERIC_READ, FILE_SHARE_READ, nil,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_SEQUENTIAL_SCAN, 0);
hHash := nil;
hProv := 0;
CryptAcquireContext(hProv, nil, nil, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptCreateHash(hProv, CALG_MD5, nil, 0, hHash);
try
ReadFile(infile, inbuffer^, bufsize, amount_read, nil);
repeat
CryptHashData(hHash, inbuffer, amount_read, 0);
ReadFile(infile, inbuffer^, bufsize, amount_read, nil);
until amount_read = 0;
cbHashDataLen := 16;
CryptGetHashParam(hHash, HP_HASHVAL, @Digest, cbHashDataLen, 0);
finally
CryptDestroyHash(hhash);
CryptReleaseContext(hprov, 0);
end;
CloseHandle(infile);
Result := write_hash(@Digest, cbHashDataLen);
FreeMem(inbuffer);
end;

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OK Here's my copy. It's just the md5sum.exe zipped up.

MD5 of md5sum.zip - 4f71896309906be74fcc7141a042951e

It's a very simplified app. To get the MD5 for the zipped file I just used the command: md5sum md5sum.zip>temp.txt

The contents of temp.txt was then: 4f71896309906be74fcc7141a042951e *md5sum.zip

The only option it has is a recursive option: [-r]

Help is just md5sum /? which gives: Usage: md5sum [-r] filenames

You'll have to try it to see if it works in Win2K. I know it works for XP+ I'll keep looking for a link on the web.

Cheers and Regards

md5sum.zip

Edited by bphlpt
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Probably ASM that calls the Windows API functions that will obtain a MD5 hash. But with storage and memory what it is, why quibble over a handful of bytes? Speaking of which, if you can do those in VBScript that's probably the best course.

Yep, ASM which direct calls the MD5 functions in the API (MD5Final, MD5Init, MD5Update in ADVAPI32.DLL).

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Which means it should be able to be remade to work in Win 2K, doesn't it? Not by me of course, but maybe by someone that knows about such things? Would be most ideal if it would work Win2K+ as I know of at least one other project that would be useful for.

Sorry I still can't find a link where it originally came from, (at least 4 or 5 years ago).

Cheers and Regards

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Which means it should be able to be remade to work in Win 2K, doesn't it? Not by me of course, but maybe by someone that knows about such things?

If the API functions aren't there, you'd have to supply them yourself (which isn't *that* hard). Of course that's going to mean the EXE will get bigger, but again it depends on what exactly you're looking for. I don't know if FCIV works in 2K or not, but if it doesn't, like I said above I can always post something that should do MD5 on any OS that'll do 32-bit executables.

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Here it is:

  
Dim sDigest

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)

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)







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 F(x, y, z)
F = (x And y) Or ((Not x) And z)
End Function

Private Function G(x, y, z)
G = (x And z) Or (y And (Not z))
End Function

Private Function H(x, y, z)
H = (x Xor y Xor z)
End Function

Private Function I(x, y, z)
I = (y Xor (x Or (Not z)))
End Function

Private Sub FF(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, B)
End Sub

Private Sub GG(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, B)
End Sub

Private Sub HH(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, B)
End Sub

Private Sub II(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(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)
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

FF a, b, c, d, x(k + 0), S11, &HD76AA478
FF d, a, b, c, x(k + 1), S12, &HE8C7B756
FF c, d, a, b, x(k + 2), S13, &H242070DB
FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
FF d, a, b, c, x(k + 5), S12, &H4787C62A
FF c, d, a, b, x(k + 6), S13, &HA8304613
FF b, c, d, a, x(k + 7), S14, &HFD469501
FF a, b, c, d, x(k + 8), S11, &H698098D8
FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
FF b, c, d, a, x(k + 11), S14, &H895CD7BE
FF a, b, c, d, x(k + 12), S11, &H6B901122
FF d, a, b, c, x(k + 13), S12, &HFD987193
FF c, d, a, b, x(k + 14), S13, &HA679438E
FF b, c, d, a, x(k + 15), S14, &H49B40821

GG a, b, c, d, x(k + 1), S21, &HF61E2562
GG d, a, b, c, x(k + 6), S22, &HC040B340
GG c, d, a, b, x(k + 11), S23, &H265E5A51
GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
GG a, b, c, d, x(k + 5), S21, &HD62F105D
GG d, a, b, c, x(k + 10), S22, &H2441453
GG c, d, a, b, x(k + 15), S23, &HD8A1E681
GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
GG d, a, b, c, x(k + 14), S22, &HC33707D6
GG c, d, a, b, x(k + 3), S23, &HF4D50D87
GG b, c, d, a, x(k + 8), S24, &H455A14ED
GG a, b, c, d, x(k + 13), S21, &HA9E3E905
GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
GG c, d, a, b, x(k + 7), S23, &H676F02D9
GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A

HH a, b, c, d, x(k + 5), S31, &HFFFA3942
HH d, a, b, c, x(k + 8), S32, &H8771F681
HH c, d, a, b, x(k + 11), S33, &H6D9D6122
HH b, c, d, a, x(k + 14), S34, &HFDE5380C
HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
HH a, b, c, d, x(k + 13), S31, &H289B7EC6
HH d, a, b, c, x(k + 0), S32, &HEAA127FA
HH c, d, a, b, x(k + 3), S33, &HD4EF3085
HH b, c, d, a, x(k + 6), S34, &H4881D05
HH a, b, c, d, x(k + 9), S31, &HD9D4D039
HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
HH b, c, d, a, x(k + 2), S34, &HC4AC5665

II a, b, c, d, x(k + 0), S41, &HF4292244
II d, a, b, c, x(k + 7), S42, &H432AFF97
II c, d, a, b, x(k + 14), S43, &HAB9423A7
II b, c, d, a, x(k + 5), S44, &HFC93A039
II a, b, c, d, x(k + 12), S41, &H655B59C3
II d, a, b, c, x(k + 3), S42, &H8F0CCC92
II c, d, a, b, x(k + 10), S43, &HFFEFF47D
II b, c, d, a, x(k + 1), S44, &H85845DD1
II a, b, c, d, x(k + 8), S41, &H6FA87E4F
II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
II c, d, a, b, x(k + 6), S43, &HA3014314
II b, c, d, a, x(k + 13), S44, &H4E0811A1
II a, b, c, d, x(k + 4), S41, &HF7537E82
II d, a, b, c, x(k + 11), S42, &HBD3AF235
II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
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

MD5 = LCase(WordToHex(a) & WordToHex(B) & WordToHex(c) & WordToHex(d))
End Function

if WScript.Arguments.Count = 0 then
WScript.Echo "Missing parameters"
else
Const ForReading = 1
Set fso = CreateObject("Scripting.FileSystemObject")
Set ts = fso.OpenTextFile(Wscript.Arguments.Item(0), ForReading)
s = ts.ReadAll
MyMD5=MD5(s)
ts.Close
wscript.echo Wscript.Arguments.Item(0) & " " & MyMD5
end if

But like any vbs code it is very slow and doesn't give "true" md5 for binary files (using adodb.stream might solve this).

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@bphlpt Unfortunately, the program doesn't work in stock Windows 2000 (md5sum.exe is not a valid Win32 application). It does, of course, work in my modified system but it would be good to have something compatible with the original one too.

@Glenn9999 FCIV supports Windows 2000 and above.

@allen2 Thank you :) but as you've said, it doesn't generate correct MD5 hashes for binary files (just tested on a DLL). It does work for text files though.

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@Glenn9999 FCIV supports Windows 2000 and above.

@allen2 Thank you :) but as you've said, it doesn't generate correct MD5 hashes for binary files (just tested on a DLL). It does work for text files though.

Okay, probably not much to worry about then if there *is* an option. As for the script, probably because it's assuming a string is getting passed somewhere and adding characters. Hard to know though.

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See if this works:

http://md5sum.codeplex.com/

Executable is 7168 bytes.

This one was made in C# so it rely on dot net to run so i don't think it meets tomasz86 requirements.

The other one seems to work properly.

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