Verify method implemented

[aravindarc]

A verification method has been implemented, which is in the TODO list.

After I couldn't find the cause of the exception:
Exception in thread "main" java.lang.NullPointerException
at org.bouncycastle.cms.CMSSignedData$1.write(Unknown Source)
pointed by issue #42, implemented this verify method.

This is a shallow verify, if the exe file contains a chain of certificates, only the leaf certificates and their counter-signatures are verified.

Check this to understand the implementation.

[coveralls]

Coverage decreased (-6.6%) to 81.727% when pulling 85cf0eb on aravindarc:feature/verification into d8729c6 on ebourg:master.

[ebourg]

Thank you for the PR. I understand that this compares the digest of the file and the one in the signatures, but does it check the validity of the certificate chain?

[aravindarc]

@ebourg No it does not but if you could tell me if this is the way to approach verification, I'll try and add checking the validity of the certificate chain

[ebourg]

@aravindarc The code has been refactored to support several file formats. Do you think you could rebase your PR on top of the latest changes? The verify() method could go in a new AuthenticodeVerifier class and take a Signable object as input.

[aravindarc]

@ebourg Yes I'll try to change as you say and also validate the certificate chain.

[mduft]

Hey. I copied the proposed code and use it to verify that our binaries are properly signed before releasing them. This works fine, the only thing I changed is to add a check for whether the used certificate is self-signed. I just copied the isSelfSigned() method from AuthenticodeSigner and verify the X509Certificate using this...

[strager]

Is the only task for this PR resolving merge conflicts?

If this feature is added to Jsign, I can switch from osslsigncode to Jsign. Then, I can implement APPX signing (#81).

Context: I use osslsigncode for signing and verification of .exe files. I want to also sign APPX files, but this is not implemented in osslsigncode (or in Jsign). I'd rather implement APPX signing in Jsign than in osslsigncode, but that would only make sense if I use Jsign for signing and verifying .exe files. (I don't want to use both Jsign and osslsigncode.)

[strager]

If this feature is added to Jsign, I can switch from osslsigncode to Jsign. Then, I can implement APPX signing (#81).

I discovered Relic which has all the features I need. Its interface isn't as nice as Jsign's for my use case, but I'll manage.

I no longer plan to work on #81.

[ebourg]

Is the only task for this PR resolving merge conflicts?

No I don't think I'll merge the PR, I'm working on another design that provides a detailed verification report.

[kushalagrawal]

Hi,
I am looking for this windows executable implementation including the MSI file and I have been waiting for this feature to be available. I have tested this on a few executable (Exe and MSI) files. It's most of the part is working for the MSI files as well. other than the part:

if(!Arrays.equals(computeDigest(signedDataAlgorithm), digestInfo.getDigest()))
                    throw new VerificationException("The embedded hash in the SignedData is not equal to the computed hash");

Is there anything that could be done to validate the MSI files as well with this?

[GitHubb3R]

Is the only task for this PR resolving merge conflicts?

No I don't think I'll merge the PR, I'm working on another design that provides a detailed verification report.

I'd like to ask about the status, progress of said that design, and whether its completely stalled.