Hello,
I have installed OpenSSL 1.1.1c. I'm trying to make a custom OpenSSL engine
for RSA. The following sample code is copied from the engine *e_dasync.c. *
Following is a sample code for my RSA engine (*rsa-engine.c*),
===================================
*/* Engine Id and Name */static const char *engine_rsa_id =
"rsa-engine-new";static const char *engine_rsa_name = "RSA engine for
testing";// data encryption functionstatic int eng_rsa_pub_enc(int flen,
const unsigned char *from, unsigned char *to, RSA *rsa, int padding) {
printf("RSA Engine is encrypting using public key\n"); return
RSA_meth_get_pub_enc(RSA_PKCS1_OpenSSL())
(flen,from,to,rsa,padding);}// signature verifystatic int
eng_rsa_pub_dec(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding) { printf("Signature
verification\n"); return 0;}// signaturestatic int eng_rsa_priv_enc(int
flen, const unsigned char *from, unsigned char *to, RSA *rsa, int
padding){ printf("Signature method:\n"); return 0;}// data
decryptionstatic int eng_rsa_priv_dec(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding){ printf("decryption
method:\n"); return 0; }static RSA_METHOD *test_rsa_method = NULL;static
int bind_dasync(ENGINE *e){ /* Setup RSA_METHOD */ if
((test_rsa_method = RSA_meth_new("Test RSA Engine", 0)) == NULL ||
RSA_meth_set_pub_enc(test_rsa_method, eng_rsa_pub_enc) == 0 ||
RSA_meth_set_pub_dec(test_rsa_method, eng_rsa_pub_dec) == 0 ||
RSA_meth_set_priv_enc(test_rsa_method, eng_rsa_priv_enc) == 0 ||
RSA_meth_set_priv_dec(test_rsa_method, eng_rsa_priv_dec) == 0 )
{ return 0; } /* Ensure the dasync error handling is set up
*/ if (!ENGINE_set_id(e, engine_rsa_id) || !ENGINE_set_name(e,
engine_rsa_name) || !ENGINE_set_RSA(e, test_rsa_method) )
{ return 0; } return 1;}static int bind_helper(ENGINE *e,
const char *id){ if (!bind_dasync(e)){ printf("2_Error: Inside
Bind helper\n"); return 0; } return
1;}IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)IMPLEMENT_DYNAMIC_CHECK_FN()*
===================================
My *Makefile *looks like the following,
===================================
*rsa-engine: gcc -g -fPIC -c rsa-engine.c gcc -g -shared -o
librsa_engine.so -L./libdune rsa-engine.o -Bdynamic -lcrypto -lpthread mv
librsa_engine.so rsa-engine-new.so sudo cp rsa-engine-new.so
/opt/openssl/lib/engines-1.1/clean: rm -f *.o *.d *.so rsa-engine*
===================================
My code compiles. When I try to do encryption using the following command,
=========================
*openssl rsautl -encrypt -inkey public.pem -pubin -in msg.txt -out msg.enc
-engine rsa-engine-new*
=========================
I get a segmentation fault,
================================
*engine "rsa-engine-new" set.RSA Engine is encrypting using public
keySegmentation fault (core dumped)*
================================
Do I need to Compile this sample engine with the OpenSSL in order for it to
work?
Regards,
Shariful Alam
