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Jul 17th, 2013, 02:57 AM
#1
Thread Starter
Lively Member
How to verify Digital Signature validity of a File by CAPICOM
Greetings,
I am using CAPICOM.dll in vb.net 2010 to check the validity of any digitally signed file's signature.
Following are the codes i'm using :
Code:
Dim signed As New CAPICOM.SignedCode
signed.FileName = cFilname
Try
Dim cert = signed.Certificates(1)
cert.IsValid.CheckFlag = CAPICOM_CHECK_FLAG.CAPICOM_CHECK_TRUSTED_ROOT Or _
CAPICOM_CHECK_FLAG.CAPICOM_CHECK_TIME_VALIDITY Or _
CAPICOM_CHECK_FLAG.CAPICOM_CHECK_SIGNATURE_VALIDITY Or _
CAPICOM_CHECK_FLAG.CAPICOM_CHECK_ONLINE_REVOCATION_STATUS
If cert.IsValid.Result Then
TextBox2.Text &= "VALID" & vbNewLine
Else
TextBox2.Text &= "NOT VALID" & vbNewLine
End If
Catch
TextBox2.Text &= "NOT VALID" & vbNewLine
End Try
Above code is working fine to check if the file (exe) is containing a digital signature OR not.
Now, the problem is when I am checking this code with a file (which has fake digital signature), it is showing "Valid Signature"
Where I am doing wrong? Please suggest me. How can I check if the exe is containing a valid signature.
Thanks
Regards,
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Jul 17th, 2013, 11:35 PM
#2
Thread Starter
Lively Member
Re: How to verify Digital Signature validity of a File by CAPICOM
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Jul 18th, 2013, 12:05 PM
#3
Re: How to verify Digital Signature validity of a File by CAPICOM
You asked a question about CAPICOM.dll without telling us anything about what it is, what it does, or how one obtains it! You then give us code with a declaration of a CAPICOM.SignedCode without any explanation of what this class is. Then we're given a string of constants that mean even less (if that's possible) because you give us neither value or type. And you round it off with "I am checking this code with a file (which has fake digital signature)" without the slightest hint of how you know this is a 'fake' and that it's not a good enough fake to fool other 'detectors' or a copy of the file so that anyone might test this.
Nope, really can't imagine why you're not getting any answers!
As the 6-dimensional mathematics professor said to the brain surgeon, "It ain't Rocket Science!"
Reviews: "dunfiddlin likes his DataTables" - jmcilhinney
Please be aware that whilst I will read private messages (one day!) I am unlikely to reply to anything that does not contain offers of cash, fame or marriage!
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Jul 18th, 2013, 11:41 PM
#4
Thread Starter
Lively Member
Re: How to verify Digital Signature validity of a File by CAPICOM
It's impressive that you don't know about CAPICOM.dll but more impressive to me that you couldn't even try google.com to know about What is CAPICOM.dll. It's for you..
Code:
http://en.wikipedia.org/wiki/CAPICOM
Well, Above description is enough to let anyone understand what is CAPICOM.dll and what i am asking about.. One more thing, You don't even know about Fake signature..Ok, It means I have copied the digitally signed data of any genuine file and used that data on any another file...
Code:
http://oi42.tinypic.com/2u94935.jpg
Here is the Snapshot.... I hope you have been clear now..
Thanks !
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Jul 19th, 2013, 09:04 AM
#5
Re: How to verify Digital Signature validity of a File by CAPICOM
you couldn't even try google.com to know about What is CAPICOM.dll
Ah, so in addition to freely giving of their time to answer your queries whilst under absolutely no obligation to do so you think people here should also waste more of that precious time on researching information that you already have and could very easily give us but apparently can't be bothered to? Wow! Just, wow!
As the 6-dimensional mathematics professor said to the brain surgeon, "It ain't Rocket Science!"
Reviews: "dunfiddlin likes his DataTables" - jmcilhinney
Please be aware that whilst I will read private messages (one day!) I am unlikely to reply to anything that does not contain offers of cash, fame or marriage!
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Jul 19th, 2013, 11:56 PM
#6
Thread Starter
Lively Member
Re: How to verify Digital Signature validity of a File by CAPICOM
Where is my hakka noodles bowl buddy... I told you to deliver it to me on time.. Now i won't give you tip...
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