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ebourg / jsign

Java implementation of Microsoft Authenticode for signing Windows executables, installers & scripts
https://ebourg.github.io/jsign
Apache License 2.0
264 stars 112 forks source link

Get CounterSign Details and Signature Verification #58

Open aravindarc opened 5 years ago

aravindarc commented 5 years ago

How to find all the counter signatures and also how to verify and validate signatures

ebourg commented 5 years ago

Just right click on the signed .exe or .dll file, select 'Properties' then 'Signatures'.

aravindarc commented 5 years ago

Sorry I should have been more explicit, my requirement is to use this library or any java library. I found how to extract the Signatures and Counter Signatures using this library, but if suppose the Signature is changed or the EXE file is tampered, how to verify the validity of the exe, the signature and the counter signature, this too in java.

aravindarc commented 5 years ago

I am implementing a verification method in PEFile class. I think it's working but I don't know for sure, which digests have to be checked against which. I have partially implemented the verification method. Can you please point to documentation for signing and verifying Authenticode Signatures.

ebourg commented 5 years ago

Verifying signatures would be a nice addition to jsign if you want to tackle this issue.

If that helps the main source of documentation is the Authenticode specification from Microsoft:

http://download.microsoft.com/download/9/c/5/9c5b2167-8017-4bae-9fde-d599bac8184a/Authenticode_PE.docx

aravindarc commented 5 years ago

Thank you, I have finished implementing and it is working just requires verification from you. I am new to git, how to push it to you. I cloned this repo and made the additions.

aravindarc commented 5 years ago

I have made a pull request related to this question. I have implemented what I think is a verification method. Can you please clarify if that's not how verification should be approached or if what I have done is incomplete. I am in need of this feature.