#211426 - 2016-05-09 04:13 PM
vbscript MD5 conversion issues
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Allen
KiX Supporter
Registered: 2003-04-19
Posts: 4562
Loc: USA
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I found a vbscript that creates a MD5 hash but have not had luck converting it to kixtart.
Here is the original vbscript code that does work:
{edit: had to change code tag to quotes on the vbscript code... board didnt like it}
'MD5=151D5E94EE1197E3A3AD8E8089A73884
spath="C:\Downloads\Firefox Setup 46.0.1.exe"
wscript.echo bytesToHex(md5hashBytes(GetBytes(sPath)))
function md5hashBytes(aBytes)
Dim MD5
set MD5 = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")
MD5.Initialize()
'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
md5hashBytes = MD5.ComputeHash_2( (aBytes) )
end function
function stringToUTFBytes(aString)
Dim UTF8
Set UTF8 = CreateObject("System.Text.UTF8Encoding")
stringToUTFBytes = UTF8.GetBytes_4(aString)
end function
function bytesToHex(aBytes)
dim hexStr, x
for x=1 to lenb(aBytes)
hexStr= hex(ascb(midb( (aBytes),x,1)))
if len(hexStr)=1 then hexStr="0" & hexStr
bytesToHex=bytesToHex & hexStr
next
end function
Function BytesToBase64(varBytes)
With CreateObject("MSXML2.DomDocument").CreateElement("b64")
.dataType = "bin.base64"
.nodeTypedValue = varBytes
BytesToBase64 = .Text
End With
End Function
Function GetBytes(sPath)
With CreateObject("Adodb.Stream")
.Type = 1 ' adTypeBinary
.Open
.LoadFromFile sPath
.Position = 0
GetBytes = .Read
.Close
End With
End Function
My goal was to create a all in one function to spit out the MD5 hash. I am getting results but they are not correct. What's interesting is, the first few digits are correct although there are 0's in between the values. Once the first few digits are reached, nothing else match the rest of the hash. There were a few vbscript specific functions that we do not have in kix that I recreated using the scriptcontrol. I was using dectohex but switched to the hex function in hopes it mattered, it didnt.
dim $sPath, $ado, $bytes, $MD5, $MD5hashbytes, $x, $hexstring, $bytestohex
$Spath="C:\Downloads\Firefox Setup 46.0.1.exe"
$ADO=createobject("Adodb.Stream")
$ADO.Type=1 ; adTypeBindar
$ADO.Open
$ADO.LoadfromFile($Spath)
$ADO.position=0
$Bytes=$ADO.Read
$ADO.close
$MD5 = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")
$MD5.Initialize()
;Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
$md5hashBytes = $MD5.ComputeHash_2( ($Bytes) )
for $x=1 to lenb($md5hashBytes)
$hexStr= right("0" + hex(ascb(midb( ($md5hashBytes),$x,1))),2)
? $hexstr
$bytesToHex=$bytesToHex + $hexStr
next
? $BytestoHex
Function ASCB($string)
Dim $sc
$sc = CreateObject("ScriptControl")
$sc.Language = "VBScript"
$ASCB = $sc.Eval('ASCB("'+ $String + '")')
EndFunction
Function MidB($string, $start, $length)
Dim $sc
$sc = CreateObject("ScriptControl")
$sc.Language = "VBScript"
$MidB = $sc.Eval('MIDB("'+ $string + '",' + $Start + ',' + $length + ')')
EndFunction
Function LenB($string)
Dim $sc
$sc = CreateObject("ScriptControl")
$sc.Language = "VBScript"
$LenB = $sc.Eval('LenB("'+ $String + '")')
EndFunction
Function Hex($Number)
Dim $sc
$sc = CreateObject("ScriptControl")
$sc.Language = "VBScript"
$Hex = $sc.Eval('Hex('+ $Number + ')')
EndFunction
Any ideas/suggestions?
Edited by Allen (2016-05-09 04:16 PM)
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#211431 - 2016-05-09 06:20 PM
Re: vbscript MD5 conversion issues
[Re: Glenn Barnas]
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Allen
KiX Supporter
Registered: 2003-04-19
Posts: 4562
Loc: USA
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CertUtil has this capability... I didn't know that. 
If all else fails at least I have that as option. I would love to see this working though.
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#211440 - 2016-05-09 09:42 PM
Re: vbscript MD5 conversion issues
[Re: Lonkero]
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Allen
KiX Supporter
Registered: 2003-04-19
Posts: 4562
Loc: USA
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I might try to do all of this within scriptcontrol. I don't know why the exe is so unappealing to me 
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#211452 - 2016-05-10 10:18 AM
Re: vbscript MD5 conversion issues
[Re: Lonkero]
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Arend_
MM club member
Registered: 2005-01-17
Posts: 1896
Loc: Hilversum, The Netherlands
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Seems interesting, I'm going to try it.
So far I get almost the correct value.
Above is the real, expected value, below is the output of my script.
dfdc6c74 96 d9645953 89 ed48e229ee81 *KIX32.EXE
DFDC6C74 1320 D9645953 3020 ED48E229EE81
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#211453 - 2016-05-10 11:01 AM
Re: vbscript MD5 conversion issues
[Re: Arend_]
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Arend_
MM club member
Registered: 2005-01-17
Posts: 1896
Loc: Hilversum, The Netherlands
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Please be amazed ;-)
$=SetOption('Explicit','On')
Function md5($filename)
Dim $objXML, $objXEL, $objMD5, $objStream, $BinaryFile
$objStream = CreateObject("ADODB.Stream")
$objStream.Type = 1
$objStream.Open
$objStream.LoadFromFile($filename)
$BinaryFile = $objStream.Read
$objStream.Close
$objStream = ""
$objMD5 = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")
$=$objMD5.ComputeHash_2($BinaryFile)
$objXML = CreateObject("MSXML2.DOMDocument")
$objXEL = $objXML.CreateElement("tmp")
$objXEL.DataType = "bin.hex"
$objXEL.NodeTypedValue = $objMD5.Hash
$md5 = $objXEL.Text
EndFunction
? md5("C:\KIX32.EXE")
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#211454 - 2016-05-10 11:34 AM
Re: vbscript MD5 conversion issues
[Re: Arend_]
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Arend_
MM club member
Registered: 2005-01-17
Posts: 1896
Loc: Hilversum, The Netherlands
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Only seems to work with files up to 250 MB. 
Probably because of some variable size limit in Kix.
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#211458 - 2016-05-10 03:26 PM
Re: vbscript MD5 conversion issues
[Re: Arend_]
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Allen
KiX Supporter
Registered: 2003-04-19
Posts: 4562
Loc: USA
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Oh wow... I'll give it whirl.
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#211459 - 2016-05-10 03:54 PM
Re: vbscript MD5 conversion issues
[Re: Allen]
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Arend_
MM club member
Registered: 2005-01-17
Posts: 1896
Loc: Hilversum, The Netherlands
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And just because it's possible:
Function SHA1($strFileName)
Dim $objXML, $objXEL, $objSHA1, $objStream, $BinaryFile
$objStream = CreateObject("ADODB.Stream")
$objStream.Type = 1
$objStream.Open
$objStream.LoadFromFile($strFileName)
$BinaryFile = $objStream.Read
$objStream.Close
$objStream = ""
$objSHA1 = CreateObject("System.Security.Cryptography.SHA1CryptoServiceProvider")
$=$objSHA1.ComputeHash_2($BinaryFile)
$objXML = CreateObject("MSXML2.DOMDocument")
$objXEL = $objXML.CreateElement("tmp")
$objXEL.DataType = "bin.hex"
$objXEL.NodeTypedValue = $objSHA1.Hash
$SHA1 = $objXEL.Text
EndFunction
? SHA1("C:\KIX32.EXE")
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