Added SHA256 test certificates
With SHA-1 deprecation, we need a few certificates using algorithms in
the default support list. Most tests still use SHA-1 though.
The generation process for the new certificates is recorded in the makefile.
diff --git a/tests/data_files/test-ca.opensslconf b/tests/data_files/test-ca.opensslconf
new file mode 100644
index 0000000..12835df
--- /dev/null
+++ b/tests/data_files/test-ca.opensslconf
@@ -0,0 +1,13 @@
+[req]
+x509_extensions = v3_ca
+distinguished_name = req_dn
+
+[req_dn]
+countryName = NL
+organizationalUnitName = PolarSSL
+commonName = PolarSSL Test CA
+
+[v3_ca]
+subjectKeyIdentifier=hash
+authorityKeyIdentifier=keyid:always,issuer:always
+basicConstraints = CA:true