Can't link a static library with custom OpenSSL rsa engine

[Shariful Alam <dipto181@xxxxxxxxx>]

Hello,

I have a custom rsa engine. It builds and works fine. Later, I have added a static library with my custom engine code. My code compiles. However, when I try to load the custom engine it shows invalid engine "rsa-engine-new".  The full error is given below,

x@x:~/Downloads/x/x/x/rsa_engine$ openssl rsautl -decrypt -inkey private.pem -in msg.enc -engine rsa-engine-new
invalid engine "rsa-engine-new"
140112744122112:error:25066067:DSO support routines:dlfcn_load:could not load the shared library:crypto/dso/dso_dlfcn.c:119:filename(/opt/openssl/lib/engines-1.1/rsa-engine-new.so): /opt/openssl/lib/engines-1.1/rsa-engine-new.so: undefined symbol: dune_init
140112744122112:error:25070067:DSO support routines:DSO_load:could not load the shared library:crypto/dso/dso_lib.c:162:
140112744122112:error:260B6084:engine routines:dynamic_load:dso not found:crypto/engine/eng_dyn.c:414:
140112744122112:error:2606A074:engine routines:ENGINE_by_id:no such engine:crypto/engine/eng_list.c:334:id=rsa-engine-new
140112744122112:error:25066067:DSO support routines:dlfcn_load:could not load the shared library:crypto/dso/dso_dlfcn.c:119:filename(librsa-engine-new.so): librsa-engine-new.so: cannot open shared object file: No such file or directory
140112744122112:error:25070067:DSO support routines:DSO_load:could not load the shared library:crypto/dso/dso_lib.c:162:
140112744122112:error:260B6084:engine routines:dynamic_load:dso not found:crypto/engine/eng_dyn.c:414:

Now the error doesn't say much about the cause of invalid engine. However my guess is it is from the  "undefined symbol: dune_init". "dune_init" is from the static library. Therefire I believe my linking is not working. I use the following Makefile to compile the engine,

1. rsa-engine: rsa/rsa.c rsa/bignum.c rsa/aes.c rsa/x509parse.c rsa/pem.c
2. gcc -fPIC -o rsa/rsa.o -c rsa/rsa.c
3. gcc -fPIC -o rsa/bignum.o -c rsa/bignum.c
4. gcc -fPIC -o rsa/aes.o -c rsa/aes.c
5. gcc -fPIC -o rsa/x509parse.o -c rsa/x509parse.c
6. gcc -fPIC -o rsa/pem.o -c rsa/pem.c
7. gcc -fPIC -c rsa-engine.c
8. gcc -shared -o librsa_engine.so libdune/libdune.a -lcrypto rsa-engine.o rsa/rsa.o rsa/bignum.o rsa/aes.o rsa/x509parse.o rsa/pem.o 
9. mv librsa_engine.so rsa-engine-new.so
10. sudo cp rsa-engine-new.so /opt/openssl/lib/engines-1.1/
11. clean:
12. rm -f *.o rsa/*.o *.so rsa-engine

So, can anyone please if my guess is correct or not? If my guess is correct, how can I fix my Makefile? 

N.B: Static library 

• libdune/libdune.a is in the same directory with the main rsa-engine.c 
• libdune/libdune.a is compiled with -fPIC flag

Thanks,

Shariful