How can I find the public key of any PE file?

Question

I want to verify the digital signature of any PE file (exe, dll) in Java. So, I need to find the public key and the signature of these files. Can you please help ?!

Answer 1

There's a good discussion here, which will be easier to understand if you have a background on the PE file format (there's a good intro here) but to summarise:

• There's a pointer at offset 24 in the file header to the PE header
• The PE header is 116 bytes long and is immediately followed by the data directory
• There's a pointer at offset 32 of the data directory to the start of the security data
• The security data is an array of resource objects, each of which contains an ASN.1 encoded certificate
• The resource object consists of a length field (4 bytes), a version number (2 bytes), a certificate type field (2 bytes), then the raw data of the certificate