Fix tests, document new limitation

> Any reference to the subject of the current manual page
> should be written with the name in bold.

README.adoc

@@ -2,7 +2,8 @@ pdf-simple-sign
 ===============
 
 'pdf-simple-sign' is a simple PDF signer intended for documents produced by
-the Cairo library, GNU troff, ImageMagick, or similar.
+the Cairo library (≤ 1.17.4 or using PDF 1.4), GNU troff, ImageMagick,
+or similar.
 
 I don't aim to extend the functionality any further.  The project is fairly
 self-contained and it should be easy to grasp and change to suit to your needs.

go.mod

@@ -3,6 +3,6 @@ module janouch.name/pdf-simple-sign
 go 1.17
 
 require (
-	go.mozilla.org/pkcs7 v0.0.0-20200128120323-432b2356ecb1
-	golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de
+	go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352
+	golang.org/x/crypto v0.10.0
 )

go.sum

@@ -1,8 +1,12 @@
 go.mozilla.org/pkcs7 v0.0.0-20200128120323-432b2356ecb1 h1:A/5uWzF44DlIgdm/PQFwfMkW0JX+cIcQi/SwLAmZP5M=
 go.mozilla.org/pkcs7 v0.0.0-20200128120323-432b2356ecb1/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
+go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352 h1:CCriYyAfq1Br1aIYettdHZTy8mBTIPo7We18TuO/bak=
+go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de h1:ikNHVSjEfnvz6sxdSPCaPt572qowuyMDMJLLm3Db3ig=
 golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.10.0 h1:LKqV2xt9+kDzSTfOhx4FrkEBcMrAgHSYgzywV9zcGmM=
+golang.org/x/crypto v0.10.0/go.mod h1:o4eNf7Ede1fv+hwOwZsTHl9EsPFO6q6ZvYR8vYfY45I=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

pdf-simple-sign.adoc

@@ -14,7 +14,7 @@ Synopsis
 
 Description
 -----------
-'pdf-simple-sign' is a simple PDF signer intended for documents produced by
+*pdf-simple-sign* is a simple PDF signer intended for documents produced by
 the Cairo library, GNU troff, ImageMagick, or similar.  As such, it currently
 comes with some restrictions:
 

test.sh

@@ -11,7 +11,8 @@ mkdir tmp
 
 # Create documents in various tools
 log "Creating source documents"
-inkscape --pipe --export-filename=tmp/cairo.pdf <<'EOF' 2>/dev/null || :
+inkscape --pipe --export-filename=tmp/cairo.pdf --export-pdf-version=1.4 \
+<<'EOF' 2>/dev/null || :
 <svg xmlns="http://www.w3.org/2000/svg"><text x="5" y="10">Hello</text></svg>
 EOF
 
@@ -45,7 +46,11 @@ openssl x509 -req -in tmp/cert.csr -out tmp/cert.pem \
 	-CA tmp/ca.cert.pem -CAkey tmp/ca.key.pem -set_serial 1 \
 	-extensions smime -extfile tmp/cert.cfg 2>/dev/null
 openssl verify -CAfile tmp/ca.cert.pem tmp/cert.pem >/dev/null
+
+# The second line accomodates the Go signer,
+# which doesn't support SHA-256 within pkcs12 handling
 openssl pkcs12 -inkey tmp/key.pem -in tmp/cert.pem \
+	-certpbe PBE-SHA1-3DES -keypbe PBE-SHA1-3DES -macalg sha1 \
 	-export -passout pass: -out tmp/key-pair.p12
 
 for tool in "$@"; do
@@ -55,6 +60,11 @@ for tool in "$@"; do
 		result=${source%.pdf}.signed.pdf
 		$tool "$source" "$result" tmp/key-pair.p12 ""
 		pdfsig -nssdir sql:tmp/nssdir "$result" | grep Validation
+
+		# Only some of our generators use PDF versions higher than 1.5
+		log "Testing $tool for version detection"
+		grep -q "/Version /1.6" "$result" || grep -q "^%PDF-1.6" "$result" \
+			|| die "Version detection seems to misbehave (no upgrade)"
 	done
 
 	log "Testing $tool for expected failures"
@@ -63,11 +73,6 @@ for tool in "$@"; do
 	$tool -r 1 "$source" "$source.fail.pdf" tmp/key-pair.p12 "" \
 		&& die "Too low reservations shouldn't succeed"
 
-	# Our generators do not use PDF versions higher than 1.5
-	log "Testing $tool for version detection"
-	grep -q "/Version /1.6" "$result" \
-		|| die "Version detection seems to misbehave (no upgrade)"
-
 	sed '1s/%PDF-1../%PDF-1.7/' "$source" > "$source.alt"
 	$tool "$source.alt" "$result.alt" tmp/key-pair.p12 ""
 	grep -q "/Version /1.6" "$result.alt" \