doc: Document experiments

famoser · Dec 28, 2024 · 020e6c6 · 020e6c6
1 parent b1e9824
commit 020e6c6
Show file tree

Hide file tree

Showing 7 changed files with 11 additions and 4 deletions.
diff --git a/specification/examples/signed/FlorianMoser- password helloworld.pfx b/specification/examples/signed/FlorianMoser- password helloworld.pfx
diff --git a/specification/examples/signed/sign.md b/specification/examples/signed/sign.md
@@ -1,13 +1,20 @@
 # How to sign a PDF
 
+options:
+- not supported by pdftk, qpdf
+- open-pdf-sign badly-written wrapper around Java PDFBox
+- pdfsig generates invalid certificates, complex operations
+- adobe acrobat feature hard to find ("use certificate"), touches/destroys file structure
+
+## pdfsig
+
 generate certificate:
 - gpgsm --generate-key (RSA, subject name CN=Florian Moser, self-signed yes)
 - gpgsm --import, then paste the certificate followed by CTRL+D
 - gpgsm --fingerprint, the copy ID field (e.g. `0x9C1A23DA`)
 
 apply certificate:
-- pdfsig signature.pdf signature_signed.pdf -add-signature -backend GPG -nick 0x9C1A23DA
+- pdfsig signature.pdf signature_signed.pdf -add-signature -backend GPG -nick 0x9C1A23DA (but observe errors in output)
+- pdfsig signature_sodapdf.pdf signature_sodapdf_signed.pdf -add-signature -backend GPG -nick 0x9C1A23DA (but resulting file invalid)
+- observe that signature of both files are invalid
 
-review of other tools:
-- not supported by pdftk, qpdf
-- open-pdf-sign bad wrapper around Java PDFBox
diff --git a/specification/examples/signed/signature_afteropeninginadobe.pdf b/specification/examples/signed/signature_afteropeninginadobe.pdf
diff --git a/specification/examples/signed/signature_afteropeninginadobe_signed.pdf b/specification/examples/signed/signature_afteropeninginadobe_signed.pdf
diff --git a/specification/examples/signed/signature_signed.pdf b/specification/examples/signed/signature_signed.pdf
diff --git a/specification/examples/signed/signature_sodapdf.pdf b/specification/examples/signed/signature_sodapdf.pdf
diff --git a/specification/examples/signed/signature_sodapdf_signed.pdf b/specification/examples/signed/signature_sodapdf_signed.pdf