Created attachment 71744 [details]
File signed by MS Word (result of step 7 in the repro steps)
Using LibreOffice to add a signature to a document that has already been signed by someone in MS Word invalidates the (still-valid) original signature.
Steps (note that a file is attached which allows you to skip steps 1-7):
1) Boot MS Word
2) Hit Escape (Create default document)
3) File -> Info -> Protect Document -> Add a Digital signature
4) Save file as ODF format (.odt)
5) Choose an RSA certificate that uses a SHA1 hash (DSA is fine too)
6) Click Sign
7) Exit MS Word
8) Open document in LibreOffice
9) Under File menu, click Digital Signatures
10) Notice they're considered valid
11) Now click "Sign Document" button and add a digital signature using a SHA1 cert
12) Observe invalid original signature
It seems that this might be happening because LibreOffice is rewriting the XML for the MS Word signature, but omitting the Type attribute on the Reference element.
This is also filed for OpenOffice.org (https://issues.apache.org/ooo/show_bug.cgi?id=121505).
Hmm, seems the other way round this time...
On saving LibreOffice says, that Didital Signitures get deleted, because I changed soemthing. No error message... No way to tell, what happens behind the scenes. (Someone tested it with 3.4.6 @issues.apache.org -> AND confirmed it)
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