diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 85b2b177f..2ad5c2af6 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -49,13 +49,12 @@ test-ca.req.sha256: $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$(test_ca_key_file_rsa) password=$(test_ca_pwd_rsa) subject_name="C=NL,O=PolarSSL,CN=PolarSSL Test CA" md=SHA256
 all_intermediate += test-ca.req.sha256
 
-test-ca.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+parse_input/test-ca.crt test-ca.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=3 request_file=test-ca.req.sha256 selfsign=1 issuer_name="C=NL,O=PolarSSL,CN=PolarSSL Test CA" issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144400 not_after=20290210144400 md=SHA1 version=3 output_file=$@
 all_final += test-ca.crt
 
-test-ca.crt.der: test-ca.crt
+parse_input/test-ca.crt.der: parse_input/test-ca.crt
 	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
-all_final += test-ca.crt.der
 
 test-ca.key.der: $(test_ca_key_file_rsa)
 	$(OPENSSL) pkey -in $< -out $@ -inform PEM -outform DER -passin "pass:$(test_ca_pwd_rsa)"
@@ -94,57 +93,60 @@ test_ca_key_file_rsa_alt = test-ca-alt.key
 cert_example_multi.csr: rsa_pkcs1_1024_clear.pem
 	$(OPENSSL) req -new -subj "/C=NL/O=PolarSSL/CN=www.example.com" -set_serial 17 -config $(test_ca_config_file) -extensions dns_alt_names -days 3650 -key rsa_pkcs1_1024_clear.pem -out $@
 
-cert_example_multi.crt: cert_example_multi.csr
-	$(OPENSSL) x509 -req -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) -extfile $(test_ca_config_file) -extensions dns_alt_names -passin "pass:$(test_ca_pwd_rsa)" -set_serial 17 -days 3653 -sha256 -in $< > $@
+parse_input/cert_example_multi.crt cert_example_multi.crt: cert_example_multi.csr
+	$(OPENSSL) x509 -req -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) \
+		-extfile $(test_ca_config_file) -extensions dns_alt_names \
+		-passin "pass:$(test_ca_pwd_rsa)" -set_serial 17 -days 3653 -sha256 \
+		-in $< > $@
 
-test_csr_v3_keyUsage.csr.der: rsa_pkcs1_1024_clear.pem
+parse_input/test_csr_v3_keyUsage.csr.der: rsa_pkcs1_1024_clear.pem
 	$(OPENSSL) req -new -subj '/CN=etcd' -config $(test_ca_config_file) -key rsa_pkcs1_1024_clear.pem -outform DER -out $@ -reqexts csr_ext_v3_keyUsage
-test_csr_v3_subjectAltName.csr.der: rsa_pkcs1_1024_clear.pem
+parse_input/test_csr_v3_subjectAltName.csr.der: rsa_pkcs1_1024_clear.pem
 	$(OPENSSL) req -new -subj '/CN=etcd' -config $(test_ca_config_file) -key rsa_pkcs1_1024_clear.pem -outform DER -out $@ -reqexts csr_ext_v3_subjectAltName
-test_csr_v3_nsCertType.csr.der: rsa_pkcs1_1024_clear.pem
+parse_input/test_csr_v3_nsCertType.csr.der: rsa_pkcs1_1024_clear.pem
 	$(OPENSSL) req -new -subj '/CN=etcd' -config $(test_ca_config_file) -key rsa_pkcs1_1024_clear.pem -outform DER -out $@ -reqexts csr_ext_v3_nsCertType
-test_csr_v3_all.csr.der: rsa_pkcs1_1024_clear.pem
+parse_input/test_csr_v3_all.csr.der: rsa_pkcs1_1024_clear.pem
 	$(OPENSSL) req -new -subj '/CN=etcd' -config $(test_ca_config_file) -key rsa_pkcs1_1024_clear.pem -outform DER -out $@ -reqexts csr_ext_v3_all
-test_csr_v3_all_malformed_extensions_sequence_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extensions_sequence_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/300B0603551D0F040403/200B0603551D0F040403/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_id_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_id_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/0603551D0F0404030201/0703551D0F0404030201/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_data_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_data_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/040403020102302F0603/050403020102302F0603/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_data_len1.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_data_len1.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/040403020102302F0603/040503020102302F0603/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_data_len2.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_data_len2.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/040403020102302F0603/040303020102302F0603/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_key_usage_bitstream_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_key_usage_bitstream_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/03020102302F0603551D/04020102302F0603551D/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_subject_alt_name_sequence_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_subject_alt_name_sequence_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/3026A02406082B060105/4026A02406082B060105/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_ns_cert_bitstream_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_ns_cert_bitstream_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/03020780300D06092A86/04020780300D06092A86/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_duplicated_extension.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_duplicated_extension.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/551D11/551D0F/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_extension_type_oid.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_extension_type_oid.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/551D11/551DFF/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_sequence_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_sequence_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/306006092A864886F70D/406006092A864886F70D/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_id_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_id_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/06092A864886F70D0109/07092A864886F70D0109/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_extension_request.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_extension_request.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/2A864886F70D01090E/2A864886F70D01090F/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_extension_request_set_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_extension_request_set_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/31533051300B0603551D/32533051300B0603551D/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_extension_request_sequence_tag.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_extension_request_sequence_tag.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/3051300B0603551D0F04/3151300B0603551D0F04/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_len1.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_len1.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/306006092A864886F70D/306106092A864886F70D/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_len2.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_len2.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/306006092A864886F70D/305906092A864886F70D/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_extension_request_sequence_len1.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_extension_request_sequence_len1.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/3051300B0603551D0F04/3052300B0603551D0F04/" | xxd -r -p ) > $@
-test_csr_v3_all_malformed_attributes_extension_request_sequence_len2.csr.der: test_csr_v3_all.csr.der
+parse_input/test_csr_v3_all_malformed_attributes_extension_request_sequence_len2.csr.der: parse_input/test_csr_v3_all.csr.der
 	(hexdump -ve '1/1 "%.2X"' $< | sed "s/3051300B0603551D0F04/3050300B0603551D0F04/" | xxd -r -p ) > $@
 
-test_cert_rfc822name.crt.der: cert_example_multi.csr
+parse_input/test_cert_rfc822name.crt.der: cert_example_multi.csr
 	$(OPENSSL) x509 -req -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) -extfile $(test_ca_config_file) -outform DER -extensions rfc822name_names -passin "pass:$(test_ca_pwd_rsa)" -set_serial 17 -days 3653 -sha256 -in $< > $@
 
 $(test_ca_key_file_rsa_alt):test-ca.opensslconf
@@ -196,37 +198,29 @@ $(test_ca_ec_cat):
 	cat $^ > $@
 all_final += $(test_ca_ec_cat)
 
-test-ca-any_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+parse_input/test-ca-any_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
-all_final += test-ca-any_policy.crt
 
-test-ca-any_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
+parse_input/test-ca-any_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca -key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 -in test-ca.req_ec.sha256 -out $@
-all_final += test-ca-any_policy_ec.crt
 
-test-ca-any_policy_with_qualifier.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+parse_input/test-ca-any_policy_with_qualifier.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_qualifier_ca -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
-all_final += test-ca-any_policy_with_qualifier.crt
 
-test-ca-any_policy_with_qualifier_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
+parse_input/test-ca-any_policy_with_qualifier_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_qualifier_ca -key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 -in test-ca.req_ec.sha256 -out $@
-all_final += test-ca-any_policy_with_qualifier_ec.crt
 
-test-ca-multi_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+parse_input/test-ca-multi_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_multi_policy_ca -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
-all_final += test-ca-multi_policy.crt
 
-test-ca-multi_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
+parse_input/test-ca-multi_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_multi_policy_ca -key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 -in test-ca.req_ec.sha256 -out $@
-all_final += test-ca-multi_policy_ec.crt
 
-test-ca-unsupported_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+parse_input/test-ca-unsupported_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_unsupported_policy_ca -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
-all_final += test-ca-unsupported_policy.crt
 
-test-ca-unsupported_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
+parse_input/test-ca-unsupported_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_unsupported_policy_ca -key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 -in test-ca.req_ec.sha256 -out $@
-all_final += test-ca-unsupported_policy_ec.crt
 
 test-ca.req_ec.sha256: $(test_ca_key_file_ec)
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$(test_ca_key_file_ec) subject_name="C=NL, O=PolarSSL, CN=Polarssl Test EC CA" md=SHA256
@@ -287,12 +281,10 @@ all_final += test-int-ca-exp.crt test-int-ca.crt test-int-ca2.crt test-int-ca3.c
 enco-cert-utf8str.pem: rsa_pkcs1_1024_clear.pem
 	$(MBEDTLS_CERT_WRITE) subject_key=rsa_pkcs1_1024_clear.pem subject_name="CN=dw.yonan.net" issuer_crt=enco-ca-prstr.pem issuer_key=rsa_pkcs1_1024_clear.pem not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
 
-crl-idp.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file)
+parse_input/crl-idp.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file)
 	$(OPENSSL) ca -gencrl -batch -cert $(test_ca_crt) -keyfile $(test_ca_key_file_rsa) -key $(test_ca_pwd_rsa) -config $(test_ca_config_file) -name test_ca -md sha256 -crldays 3653 -crlexts crl_ext_idp -out $@
-all_final += crl-idp.pem
-crl-idpnc.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file)
+parse_input/crl-idpnc.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file)
 	$(OPENSSL) ca -gencrl -batch -cert $(test_ca_crt) -keyfile $(test_ca_key_file_rsa) -key $(test_ca_pwd_rsa) -config $(test_ca_config_file) -name test_ca -md sha256 -crldays 3653 -crlexts crl_ext_idp_nc -out $@
-all_final += crl-idpnc.pem
 
 cli_crt_key_file_rsa = cli-rsa.key
 cli_crt_extensions_file = cli.opensslconf
@@ -312,9 +304,8 @@ cli-rsa-sha256.crt.der: cli-rsa-sha256.crt
 	$(OPENSSL) x509 -in $< -out $@ -inform PEM -outform DER
 all_final += cli-rsa-sha256.crt.der
 
-cli-rsa-sha256-badalg.crt.der: cli-rsa-sha256.crt.der
+parse_input/cli-rsa-sha256-badalg.crt.der: cli-rsa-sha256.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/06092A864886F70D01010B0500/06092A864886F70D01010B0900/2" | xxd -r -p > $@
-all_final += cli-rsa-sha256-badalg.crt.der
 
 cli-rsa.key.der: $(cli_crt_key_file_rsa)
 	$(OPENSSL) pkey -in $< -out $@ -inform PEM -outform DER
@@ -348,21 +339,18 @@ server7-badsign.crt: server7.crt $(test_ca_int_rsa1)
 	{ head -n-2 $<; tail -n-2 $< | sed -e '1s/0\(=*\)$$/_\1/' -e '1s/[^_=]\(=*\)$$/0\1/' -e '1s/_/1/'; cat $(test_ca_int_rsa1); } > $@
 all_final += server7-badsign.crt
 
-server7_int-ca.crt: server7.crt $(test_ca_int_rsa1)
+parse_input/server7_int-ca.crt server7_int-ca.crt: server7.crt $(test_ca_int_rsa1)
 	cat server7.crt $(test_ca_int_rsa1) > $@
 all_final += server7_int-ca.crt
 
-server7_pem_space.crt: server7.crt $(test_ca_int_rsa1)
+parse_input/server7_pem_space.crt: server7.crt $(test_ca_int_rsa1)
 	cat server7.crt $(test_ca_int_rsa1) | sed '4s/\(.\)$$/ \1/' > $@
-all_final += server7_pem_space.crt
 
-server7_all_space.crt: server7.crt $(test_ca_int_rsa1)
+parse_input/server7_all_space.crt: server7.crt $(test_ca_int_rsa1)
 	{ cat server7.crt | sed '4s/\(.\)$$/ \1/'; cat test-int-ca.crt | sed '4s/\(.\)$$/ \1/'; } > $@
-all_final += server7_all_space.crt
 
-server7_trailing_space.crt: server7.crt $(test_ca_int_rsa1)
+parse_input/server7_trailing_space.crt: server7.crt $(test_ca_int_rsa1)
 	cat server7.crt $(test_ca_int_rsa1) | sed 's/\(.\)$$/\1 /' > $@
-all_final += server7_trailing_space.crt
 
 server7_int-ca_ca2.crt: server7.crt $(test_ca_int_rsa1) $(test_ca_crt_file_ec)
 	cat server7.crt $(test_ca_int_rsa1) $(test_ca_crt_file_ec) > $@
@@ -428,16 +416,16 @@ server5-ss-forgeca.crt: server5.key
 	$(FAKETIME) '2015-09-01 14:08:43' $(OPENSSL) req -x509 -new -subj "/C=UK/O=mbed TLS/CN=mbed TLS Test intermediate CA 3" -set_serial 77 -config $(test_ca_config_file) -extensions noext_ca -days 3650 -sha256 -key $< -out $@
 all_final += server5-ss-forgeca.crt
 
-server5-othername.crt.der: server5.key
+parse_input/server5-othername.crt.der: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions othername_san -days 3650 -sha256 -key $< -outform der -out $@
 
-server5-nonprintable_othername.crt.der: server5.key
+parse_input/server5-nonprintable_othername.crt.der: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS non-printable othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions nonprintable_othername_san -days 3650 -sha256 -key $< -outform der -out $@
 
-server5-unsupported_othername.crt.der: server5.key
+parse_input/server5-unsupported_othername.crt.der: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS unsupported othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions unsupported_othername_san -days 3650 -sha256 -key $< -outform der -out $@
 
-server5-fan.crt.der: server5.key
+parse_input/server5-fan.crt.der: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS FAN" -set_serial 77 -config $(test_ca_config_file) -extensions fan_cert -days 3650 -sha256 -key server5.key -outform der -out $@
 
 server5-tricky-ip-san.crt.der: server5.key
@@ -449,10 +437,10 @@ all_final += server5-tricky-ip-san.crt.der
 server5-tricky-ip-san-malformed-len.crt.der: server5-tricky-ip-san.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/87046162636487106162/87056162636487106162/" | xxd -r -p > $@
 
-server5-directoryname.crt.der: server5.key
+parse_input/server5-directoryname.crt.der: server5.key
 	$(OPENSSL) req -x509 -outform der -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS directoryName SAN" -set_serial 77 -config $(test_ca_config_file) -extensions directory_name_san -days 3650 -sha256 -key server5.key -out $@
 
-server5-two-directorynames.crt.der: server5.key
+parse_input/server5-two-directorynames.crt.der: server5.key
 	$(OPENSSL) req -x509 -outform der -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS directoryName SAN" -set_serial 77 -config $(test_ca_config_file) -extensions two_directorynames -days 3650 -sha256 -key server5.key -out $@
 
 server5-der0.crt: server5.crt.der
@@ -480,17 +468,17 @@ all_final += server5-der0.crt server5-der1b.crt server5-der4.crt \
 			 server5-der8.crt
 
 # directoryname sequence tag malformed
-server5-directoryname-seq-malformed.crt.der: server5-two-directorynames.crt.der
+parse_input/server5-directoryname-seq-malformed.crt.der: parse_input/server5-two-directorynames.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/62A4473045310B/62A4473145310B/" | xxd -r -p > $@
 
 # Second directoryname OID length malformed 03 -> 15
-server5-second-directoryname-oid-malformed.crt.der: server5-two-directorynames.crt.der
+parse_input/server5-second-directoryname-oid-malformed.crt.der: parse_input/server5-two-directorynames.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/0355040A0C0A4D414C464F524D5F4D45/1555040A0C0A4D414C464F524D5F4D45/" | xxd -r -p > $@
 
-rsa_single_san_uri.crt.der: rsa_single_san_uri.key
+parse_input/rsa_single_san_uri.crt.der rsa_single_san_uri.crt.der: rsa_single_san_uri.key
 	$(OPENSSL) req -x509 -outform der -nodes -days 7300 -newkey rsa:2048 -key $< -out $@ -addext "subjectAltName = URI:urn:example.com:5ff40f78-9210-494f-8206-c2c082f0609c" -extensions 'v3_req' -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS URI SAN"
 
-rsa_multiple_san_uri.crt.der: rsa_multiple_san_uri.key
+parse_input/rsa_multiple_san_uri.crt.der: rsa_multiple_san_uri.key
 	$(OPENSSL) req -x509 -outform der -nodes -days 7300 -newkey rsa:2048 -key $< -out $@ -addext "subjectAltName = URI:urn:example.com:5ff40f78-9210-494f-8206-c2c082f0609c, URI:urn:example.com:5ff40f78-9210-494f-8206-abcde1234567" -extensions 'v3_req' -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS URI SAN"
 
 test-int-ca3-badsign.crt: test-int-ca3.crt
@@ -1297,19 +1285,19 @@ all_final += ec_bp512_prv.der
 ### Generate CSRs for X.509 write test suite
 ################################################################
 
-server1.req.sha1: server1.key
+parse_input/server1.req.sha1 server1.req.sha1: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1
 all_final += server1.req.sha1
 
-server1.req.md5: server1.key
+parse_input/server1.req.md5 server1.req.md5: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=MD5
 all_final += server1.req.md5
 
-server1.req.sha224: server1.key
+parse_input/server1.req.sha224 server1.req.sha224: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA224
 all_final += server1.req.sha224
 
-server1.req.sha256: server1.key
+parse_input/server1.req.sha256 server1.req.sha256: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA256
 all_final += server1.req.sha256
 
@@ -1318,11 +1306,11 @@ server1.req.sha256.ext: server1.key
 	openssl req -new -out $@ -key $< -subj '/C=NL/O=PolarSSL/CN=PolarSSL Server 1' -sha256 -addext "extendedKeyUsage=serverAuth" -addext "subjectAltName=URI:http://pki.example.com/,IP:127.1.1.0,DNS:example.com"
 all_final += server1.req.sha256.ext
 
-server1.req.sha384: server1.key
+parse_input/server1.req.sha384 server1.req.sha384: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA384
 all_final += server1.req.sha384
 
-server1.req.sha512: server1.key
+parse_input/server1.req.sha512 server1.req.sha512: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA512
 all_final += server1.req.sha512
 
@@ -1346,9 +1334,8 @@ server1.req.cert_type_empty: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1 force_ns_cert_type=1
 all_final += server1.req.cert_type_empty
 
-server1.req.commas.sha256: server1.key
+parse_input/server1.req.commas.sha256: server1.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL\, Commas,CN=PolarSSL Server 1" md=SHA256
-all_final += server1.req.commas.sha256
 
 # server2*
 
@@ -1358,7 +1345,9 @@ server2.req.sha256: server2.key
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=localhost" md=SHA256
 all_intermediate += server2.req.sha256
 
+parse_input/server2.crt.der: parse_input/server2.crt
 server2.crt.der: server2.crt
+parse_input/server2.crt.der server2.crt.der:
 	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
 all_final += server2.crt.der
 
@@ -1380,13 +1369,13 @@ server5.csr: server5.key
 	$(OPENSSL) req -new -subj "/C=NL/O=PolarSSL/CN=localhost" \
 					-key $< -out $@
 all_intermediate += server5.csr
-server5.crt: server5-sha256.crt
+parse_input/server5.crt server5.crt: server5-sha256.crt
 	cp $< $@
 all_intermediate += server5-sha256.crt
 server5-sha%.crt: server5.csr $(test_ca_crt_file_ec) $(test_ca_key_file_ec) server5.crt.openssl.v3_ext
 	$(OPENSSL) x509 -req -CA $(test_ca_crt_file_ec) -CAkey $(test_ca_key_file_ec) \
 				-extfile server5.crt.openssl.v3_ext -set_serial 9 -days 3650 \
-				-sha$(@:server5-sha%.crt=%) -in $< -out $@
+				-sha$(@F:server5-sha%.crt=%) -in $< -out $@
 all_final += server5.crt server5-sha1.crt server5-sha224.crt server5-sha384.crt server5-sha512.crt
 
 server5-badsign.crt: server5.crt
@@ -1427,9 +1416,16 @@ test_ca_server1_config_file = test-ca.server1.opensslconf
 
 # server1*
 
-server1.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
-server1.allSubjectAltNames.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)	
+parse_input/server1.crt: parse_input/server1.req.sha256
+server1.crt: server1.req.sha256
+parse_input/server1.crt server1.crt: $(test_ca_crt) $(test_ca_key_file_rsa)
+parse_input/server1.crt server1.crt:
+	$(MBEDTLS_CERT_WRITE) request_file=$(@D)/server1.req.sha256 \
+		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) version=1 \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA1 version=3 output_file=$@
+server1.allSubjectAltNames.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@ san=URI:http://pki.example.com\;IP:1.2.3.4\;DN:C=UK,O="Mbed TLS",CN="SubjectAltName test"\;DNS:example.com\;RFC822:mail@example.com
 server1.long_serial.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	echo "112233445566778899aabbccddeeff0011223344" > test-ca.server1.tmp.serial
@@ -1442,24 +1438,34 @@ server1.long_serial_FF.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test
 	$(OPENSSL) ca -in server1.req.sha256 -key PolarSSLTest -config test-ca.server1.test_serial.opensslconf -notext -batch -out $@
 server1.noauthid.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 authority_identifier=0 version=3 output_file=$@
-server1.crt.der: server1.crt
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 authority_identifier=0 version=3 output_file=$@
+parse_input/server1.crt.der: parse_input/server1.crt
+	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 \
+		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA1 authority_identifier=0 version=3 output_file=$@
 server1.der: server1.crt
 	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
-server1.commas.crt: server1.key server1.req.commas.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.commas.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
+server1.commas.crt: server1.key parse_input/server1.req.commas.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
+	$(MBEDTLS_CERT_WRITE) request_file=parse_input/server1.req.commas.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
 all_final += server1.crt server1.noauthid.crt server1.crt.der server1.commas.crt
 
-server1.key_usage.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 key_usage=digital_signature,non_repudiation,key_encipherment version=3 output_file=$@
+parse_input/server1.key_usage.crt: parse_input/server1.req.sha256
+server1.key_usage.crt: server1.req.sha256
+parse_input/server1.key_usage.crt server1.key_usage.crt: $(test_ca_crt) $(test_ca_key_file_rsa)
+parse_input/server1.key_usage.crt server1.key_usage.crt:
+	$(MBEDTLS_CERT_WRITE) request_file=$(@D)/server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 key_usage=digital_signature,non_repudiation,key_encipherment version=3 output_file=$@
 server1.key_usage_noauthid.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 key_usage=digital_signature,non_repudiation,key_encipherment authority_identifier=0 version=3 output_file=$@
 server1.key_usage.der: server1.key_usage.crt
 	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
 all_final += server1.key_usage.crt server1.key_usage_noauthid.crt server1.key_usage.der
 
-server1.cert_type.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 ns_cert_type=ssl_server version=3 output_file=$@
+parse_input/server1.cert_type.crt: parse_input/server1.req.sha256
+server1.cert_type.crt: server1.req.sha256
+parse_input/server1.cert_type.crt server1.cert_type.crt: $(test_ca_crt) $(test_ca_key_file_rsa)
+parse_input/server1.cert_type.crt server1.cert_type.crt:
+	$(MBEDTLS_CERT_WRITE) request_file=$(@D)/server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 ns_cert_type=ssl_server version=3 output_file=$@
 server1.cert_type_noauthid.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 ns_cert_type=ssl_server authority_identifier=0 version=3 output_file=$@
 server1.cert_type.der: server1.cert_type.crt
@@ -1484,23 +1490,23 @@ server1_ca.crt: server1.crt $(test_ca_crt)
 	cat server1.crt $(test_ca_crt) > $@
 all_final += server1_ca.crt
 
-cert_sha1.crt: server1.key
+parse_input/cert_sha1.crt cert_sha1.crt: server1.key
 	$(MBEDTLS_CERT_WRITE) subject_key=server1.key subject_name="C=NL, O=PolarSSL, CN=PolarSSL Cert SHA1" serial=7 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
 all_final += cert_sha1.crt
 
-cert_sha224.crt: server1.key
+parse_input/cert_sha224.crt cert_sha224.crt: server1.key
 	$(MBEDTLS_CERT_WRITE) subject_key=server1.key subject_name="C=NL, O=PolarSSL, CN=PolarSSL Cert SHA224" serial=8 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA224 version=3 output_file=$@
 all_final += cert_sha224.crt
 
-cert_sha256.crt: server1.key
+parse_input/cert_sha256.crt cert_sha256.crt: server1.key
 	$(MBEDTLS_CERT_WRITE) subject_key=server1.key subject_name="C=NL, O=PolarSSL, CN=PolarSSL Cert SHA256" serial=9 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA256 version=3 output_file=$@
 all_final += cert_sha256.crt
 
-cert_sha384.crt: server1.key
+parse_input/cert_sha384.crt cert_sha384.crt: server1.key
 	$(MBEDTLS_CERT_WRITE) subject_key=server1.key subject_name="C=NL, O=PolarSSL, CN=PolarSSL Cert SHA384" serial=10 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA384 version=3 output_file=$@
 all_final += cert_sha384.crt
 
-cert_sha512.crt: server1.key
+parse_input/cert_sha512.crt cert_sha512.crt: server1.key
 	$(MBEDTLS_CERT_WRITE) subject_key=server1.key subject_name="C=NL, O=PolarSSL, CN=PolarSSL Cert SHA512" serial=11 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA512 version=3 output_file=$@
 all_final += cert_sha512.crt
 
@@ -1545,7 +1551,7 @@ server1_all: crl.pem crl-futureRevocationDate.pem server1.crt server1.noauthid.c
 
 # server2*
 
-server2.crt: server2.req.sha256
+parse_input/server2.crt server2.crt: server2.req.sha256
 	$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=2 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
 all_final += server2.crt
 
@@ -1559,7 +1565,7 @@ all_final += server2-sha256.crt
 
 # server3*
 
-server3.crt: server3.key
+parse_input/server3.crt server3.crt: server3.key
 	$(MBEDTLS_CERT_WRITE) subject_key=$< subject_name="C=NL,O=PolarSSL,CN=localhost" serial=13 \
 		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) \
 		not_before=20190210144406 not_after=20290210144406 \
@@ -1568,7 +1574,7 @@ all_final += server3.crt
 
 # server4*
 
-server4.crt: server4.key
+parse_input/server4.crt server4.crt: server4.key
 	$(MBEDTLS_CERT_WRITE) subject_key=$< subject_name="C=NL,O=PolarSSL,CN=localhost" serial=8 \
 		issuer_crt=$(test_ca_crt_file_ec) issuer_key=$(test_ca_key_file_ec) \
 		not_before=20190210144400 not_after=20290210144400 \
@@ -1583,8 +1589,12 @@ cert_md5.csr: $(cert_md_test_key)
 	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Cert MD5" md=MD5
 all_intermediate += cert_md5.csr
 
-cert_md5.crt: cert_md5.csr
-	$(MBEDTLS_CERT_WRITE) request_file=$< serial=6 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20000101121212 not_after=20300101121212 md=MD5 version=3 output_file=$@
+parse_input/cert_md5.crt cert_md5.crt: cert_md5.csr
+	$(MBEDTLS_CERT_WRITE) request_file=$< serial=6 \
+		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) \
+		not_before=20000101121212 not_after=20300101121212 \
+		md=MD5 version=3 output_file=$@
 all_final += cert_md5.crt
 
 # TLSv1.3 test certificates
diff --git a/tests/data_files/test-ca.opensslconf b/tests/data_files/test-ca.opensslconf
index ff22cdbb4..434876c83 100644
--- a/tests/data_files/test-ca.opensslconf
+++ b/tests/data_files/test-ca.opensslconf
@@ -108,13 +108,13 @@ nsCertType=client
 [directory_name_san]
 subjectAltName=dirName:dirname_sect
 
-[bad_second_directory_name_san]
-subjectAltName=dirName:dirname_sect, dirName:dirname_sect_bad
+[two_directorynames]
+subjectAltName=dirName:dirname_sect, dirName:dirname_to_malform
 
 [dirname_sect]
 C=UK
 O=Mbed TLS
 CN=Mbed TLS directoryName SAN
 
-[two_directorynames]
+[dirname_to_malform]
 O=MALFORM_ME