Add test for same CA with different keys

When a trusted CA is rolling its root keys, it could happen that for some
users the list of trusted roots contains two versions of the same CA with the
same name but different keys. Currently this is supported but wasn't tested.

Note: the intermediate file test-ca-alt.csr is commited on purpose, as not
commiting intermediate files causes make to regenerate files that we don't
want it to touch.
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index e0f7b9d..3c7fd41 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -45,6 +45,23 @@
 	$(OPENSSL) req -x509 -config $(test_ca_config_file) -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.csr -out $@
 all_final += test-ca-sha256.crt
 
+test_ca_key_file_rsa_alt = test-ca-alt.key
+
+$(test_ca_key_file_rsa_alt):
+	$(OPENSSL) genrsa -out $@ 2048
+test-ca-alt.csr: $(test_ca_key_file_rsa_alt) $(test_ca_config_file)
+	$(OPENSSL) req -new -config $(test_ca_config_file) -key $(test_ca_key_file_rsa_alt) -subj "/C=NL/O=PolarSSL/CN=PolarSSL Test CA" -out $@
+all_intermediate += test-ca-alt.csr
+test-ca-alt.crt: $(test_ca_key_file_rsa_alt) $(test_ca_config_file) test-ca-alt.csr
+	$(OPENSSL) req -x509 -config $(test_ca_config_file) -key $(test_ca_key_file_rsa_alt) -set_serial 0 -days 3653 -sha256 -in test-ca-alt.csr -out $@
+all_final += test-ca-alt.crt
+test-ca-alt-good.crt: test-ca-alt.crt test-ca-sha256.crt
+	cat test-ca-alt.crt test-ca-sha256.crt > $@
+all_final += test-ca-alt-good.crt
+test-ca-good-alt.crt: test-ca-alt.crt test-ca-sha256.crt
+	cat test-ca-sha256.crt test-ca-alt.crt > $@
+all_final += test-ca-good-alt.crt
+
 test_ca_crt_file_ec = test-ca2.crt
 test_ca_key_file_ec = test-ca2.key
 
diff --git a/tests/data_files/test-ca-alt-good.crt b/tests/data_files/test-ca-alt-good.crt
new file mode 100644
index 0000000..50c1453
--- /dev/null
+++ b/tests/data_files/test-ca-alt-good.crt
@@ -0,0 +1,42 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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diff --git a/tests/data_files/test-ca-alt.crt b/tests/data_files/test-ca-alt.crt
new file mode 100644
index 0000000..7399e43
--- /dev/null
+++ b/tests/data_files/test-ca-alt.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca-alt.csr b/tests/data_files/test-ca-alt.csr
new file mode 100644
index 0000000..898c9e6
--- /dev/null
+++ b/tests/data_files/test-ca-alt.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
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diff --git a/tests/data_files/test-ca-alt.key b/tests/data_files/test-ca-alt.key
new file mode 100644
index 0000000..84b8fab
--- /dev/null
+++ b/tests/data_files/test-ca-alt.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
diff --git a/tests/data_files/test-ca-good-alt.crt b/tests/data_files/test-ca-good-alt.crt
new file mode 100644
index 0000000..9edf4c2
--- /dev/null
+++ b/tests/data_files/test-ca-good-alt.crt
@@ -0,0 +1,42 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----