Undefined reference to EVP_CIPHER_CTX_init

[Ruth1993]

Hello,

I think I found a bug. When I try to compile dlog_example.cpp, I get the following errors:

../libscapi/libscapi.a(Prg.o): In function PrgFromOpenSSLAES::~PrgFromOpenSSLAES()': /home/name/libscapi/src/primitives/Prg.cpp:244: undefined reference toEVP_CIPHER_CTX_cleanup' ../libscapi/libscapi.a(Prg.o): In function PrgFromOpenSSLAES::setKey(SecretKey&)': /home/name/libscapi/src/primitives/Prg.cpp:271: undefined reference toEVP_CIPHER_CTX_init' /home/name/libscapi/src/primitives/Prg.cpp:284: undefined reference to EVP_CIPHER_CTX_cleanup' /home/name/libscapi/src/primitives/Prg.cpp:285: undefined reference toEVP_CIPHER_CTX_init' collect2: error: ld returned 1 exit status

I have googled around, but it seems to do with the version of OpenSSL, since in newer versions (v1.1.0 and higher), EVP_CIPHER_CTX_init has been replaced by

EVP_CIPHER_CTX *ctx; ctx = EVP_CIPHER_CTX_new()

(see also https://forum.dlang.org/post/adwifstdvumbngnvzyvx@forum.dlang.org)

I'm not entirely sure if this is a real bug or if I did something wrong, so if anyone could comment on this, that would be great. :)

Kind regards, Ruth

[liorko87]

Hello,

Can you provide your OpenSSL and OS version?

Lior

[Ruth1993]

I'm using Ubuntu 18.04 with OpenSSL 1.1.1.b.

[liorko87]

Can you print the output of ls command at libscapi/install/lib and libdcapi/install/include?

[Ruth1993]

At libscapi/install/lib:

libboost_atomic.a      libboost_serialization.a   libmiracl.a
libboost_chrono.a      libboost_system.a          libntl.a
libboost_date_time.a   libboost_thread.a          libOTe.a
libboost_filesystem.a  libboost_wserialization.a  libOTExtensionBristol.a
libboost_log.a         libcrypto.a                libsimpleot.a
libboost_log_setup.a   libcryptoTools.a           libssl.a
libboost_regex.a liblibOTe_Tests.a libtests_cryptoTools.a

At libscapi.install/include: boost libOTe NTL openssl OTExtensionBristol

[liorko87]

I installed libscapi on a new machine over AWS. I managed to build and compile libscapi and the corresponding examples.

libscapi uses the old version of OpenSSL. Thus when you are linking with libscapi you must use the libraries that it compiles during the installation (i.e libssl.a under your install/lib dir).

Can you share your Makefile/CMake file?

[Ruth1993]

It works when I build the examples from the examples folder, but when I try to compile the code of DlogGroup on the Quickstart page (https://biulibscapi.readthedocs.io/en/latest/quickstart.html), I get the errors which I mentioned above.

Here's my Makefile (in .txt format): Makefile.txt

[liorko87]

Try to compile with this line: g++ example.cpp -I/~/libscapi/install/include -std=c++11 libscapi.a ~/libscapi/install/lib/libssl.a ~/libscapi/install/lib/libcrypto.a -lgmp

[Ruth1993]

Then I get the following error, because it is probably unable to find the boost folder:

`In file included from ../libscapi/include/primitives/Dlog.hpp:31:0, from ../libscapi/include/primitives/DlogOpenSSL.hpp:34, from dlog_example.cpp:1: ../libscapi/include/primitives/../infra/Common.hpp:33:10: fatal error: boost/random.hpp: No such file or directory

include <boost/random.hpp>`

Are you sure the problem is not within the usage of OpenSSL? Since I believe libscapi migrated to a newer version of OpenSSL, so maybe some lines of codes need to be changed, as mentioned in my first post. Please correct me if I'm wrong.

[liorko87]

@Ruth1993 the problem is with OpenSSL. libscapi supported in the past in OpenSSL 1.1.x. We are working again to return this support.

I will leave this issue open.

Lior

[liorko87]

Hello @Ruth1993,

Please pull the latest version of libscapi fron the dev branch. Rebuild it and try again. I added support for OpenSSL 1.1.x.

[Ruth1993]

Thanks a lot! I'll try.