Calling OpenSSL functions from custom openssl engine causing segmentation fault?

Shariful Alam dipto181 at
Mon Sep 20 01:03:06 UTC 2021

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
(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

My *Makefile *looks like the following,

*rsa-engine: gcc -g -fPIC -c rsa-engine.c gcc -g -shared -o -L./libdune rsa-engine.o -Bdynamic -lcrypto -lpthread mv sudo cp
/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

Shariful Alam
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