--- /dev/null
+#!/bin/sh
+
+fake_sigalg (){
+ cat $1 | sed "s/IhvcNAQE/IhvcAAQE/" > $2
+}
+
+fake_sig (){
+ cat $1 | sed "s/[^a]=\$/c=/" | sed "s/a=/b=/" |sed "s/c=/a=/" > $2
+}
+
+mkdir -p testdata
+openssl req -new -newkey rsa:2048 -nodes -keyout testdata/tmppriv.key -out testdata/test.csr -subj "/CN=bla" 2>/dev/null
+openssl spkac -challenge a -key testdata/tmppriv.key -out testdata/test.spkac
+
+for alg in csr spkac; do
+ fake_sigalg testdata/test.$alg testdata/test_invalid_sig.$alg
+ fake_sig testdata/test.$alg testdata/test_false_sig.$alg
+done