Add tests for x509parse_key_ec()
Test files were generated as follows:
openssl ecparam -name prime192v1 -genkey > key.pem
openssl ec -in key.pem -pubout -outform PEM > pub.pem
openssl ec -in key.pem -pubout -outform DER > pub.der
openssl ec -in key.pem -outform pem > prv.sec1.pem
openssl ec -in key.pem -outform der > prv.sec1.der
openssl ec -in key.pem -des -passout pass:polar -outform pem > prv.sec1.pw.pem
openssl pkcs8 -topk8 -in key.pem -nocrypt -outform pem > prv.pk8.pem
openssl pkcs8 -topk8 -in key.pem -nocrypt -outform der > prv.pk8.der
openssl pkcs8 -topk8 -in key.pem -passout pass:polar -outform der \
> prv.pk8.pw.der
openssl pkcs8 -topk8 -in key.pem -passout pass:polar -outform pem \
> prv.pk8.pw.pem
diff --git a/tests/data_files/ec_prv.sec1.pem b/tests/data_files/ec_prv.sec1.pem
new file mode 100644
index 0000000..a8a7990
--- /dev/null
+++ b/tests/data_files/ec_prv.sec1.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MF8CAQEEGDOOhqiB4jj1Sb1vBVNJS3Pj1hEw/cbJbaAKBggqhkjOPQMBAaE0AzIA
+BFF1vN8wo3DznVOT5hJyiNgBZ7X0tLd2xnT3xvNUt9IkBiwfaFS1p68P5Xjq8ljw
+Jw==
+-----END EC PRIVATE KEY-----