undefined reference to `x25519_scalar_mulx'

[lx-1234]

I compile and install openssl 3.0.7 on ubuntu20.04, and ensure the function x25519_scalar_mulx is available

$ nm libcrypto.a | grep x25519_scalar_mulx
00000000000032e0 T x25519_scalar_mulx

But when i compile the project, there is an error

test_mqrpmt_psi.cpp:(.text+0x799f): undefined reference to `x25519_scalar_mulx'

Could you give me some advice to fix it?

[yuchen1024]

I retest the lib on Linux. I did not encounter the problem you mentioned. Everything goes well.

[lx-1234]

My openssl version is 3.0.7. I compile and install it as following:

$ ./Configure --prefix=/usr/local/openssl shared enable-ec_nistp_64_gcc_128
$ make install

Then, I compile the lib:

$ cmake .. -DCMAKE_PREFIX_PATH=/usr/local/openssl
$ make

and encounter the problem. Is there something wrong? By the way, I don't know if the following lines should be added to the end of curve25519.hpp:

#ifdef __cplusplus
}
#endif

Thanks for your reply.

[yuchen1024]

Do you modified the "crypto/ec/curve25519.c" as I documented in the readme.txt?

[lx-1234]

Yes, I removed "static" of function x25519_scalar_mulx.

[lyoiycz]

I think it is possible that the ${OPENSSL_LIBRARIES} path generated by FIND_PACKAGE (OpenSSL REQUIRED) in CMakeLists.txt is linked to libcrypto.so, not libcrypto.a

[lx-1234]

I think it is possible that the ${OPENSSL_LIBRARIES} path generated by FIND_PACKAGE (OpenSSL REQUIRED) in CMakeLists.txt is linked to libcrypto.so, not libcrypto.a

It explains. Now it works. Thanks!

[yuchen1024]

I have updated the compile commands for linux. Hope it works~

On Thu, 26 Jan 2023 at 12:10, czylzx @.***> wrote:

I think it is possible that the ${OPENSSL_LIBRARIES} path generated by FIND_PACKAGE (OpenSSL REQUIRED) in CMakeLists.txt is linked to libcrypto.so, not libcrypto.a

It explains. Now it works. Thanks!

Could you please give me some advice to fix it? Thanks

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