pjfanning opened a new pull request, #1476:
URL: https://github.com/apache/poi/pull/1476

   Builds on #1475; that commit appears here too until it's merged.
   
   When a signature is verified, `SignaturePart.validate()` now also compares 
the package's relationships with the ones the signature covers. In each 
relationships part, a relationship that isn't covered must not have the same 
type as one that is. If it does, `verifySignature()` returns false and the 
relationship is logged.
   
   Signers don't all cover the same relationship types. For example, Office 
leaves out `customXml`, and some signers leave out `presProps`. Types that a 
signer leaves out entirely are therefore not checked, and all signed samples in 
test-data still verify.
   
   New test: `testAddedRelationshipIsNotSigned`. `TestSignatureInfo` and the 
other `dsig` tests pass locally.
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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