error: field 'ctx' has incomplete type EVP_CIPHER_CTX

Question

Problem: I need to install Cepstral (tts engine) into Freeswitch running Debian 8. Freeswitch is already up and running, but I needed to build it from source in order for it create the mod_cepstral module.

When I run make this is the error I get:

In file included from ./crypto/include/prng.h:17:0,
                 from ./crypto/include/crypto_kernel.h:50,
                 from ./include/srtp.h:53,
                 from srtp/srtp.c:46:
./crypto/include/aes_icm_ossl.h:66:20: error: field ‘ctx’ has incomplete type
     EVP_CIPHER_CTX ctx;
                    ^~~
In file included from srtp/srtp.c:50:0:
./crypto/include/aes_gcm_ossl.h:58:18: error: field ‘ctx’ has incomplete type
   EVP_CIPHER_CTX ctx;
                  ^~~
Makefile:646: recipe for target 'srtp.lo' failed
make[1]: *** [srtp.lo] Error 1
make[1]: Leaving directory '/usr/src/freeswitch/libs/srtp'
Makefile:3931: recipe for target 'libs/srtp/libsrtp.la' failed
make: *** [libs/srtp/libsrtp.la] Error 2

I have been scouring the internet for solutions, but I am not a developer and this is way over my head. Any help would be appreciated.

Voronezh

Answer 1

After talking with support at Cepstral, we determined that Jessie (Debian 8) is not yet fully compatible. I rebuilt the server with Debian 7 and it is working fine now.

Voronezh

Answer 2

cause newer OpenSSL don't expose struct EVP_CIPHER_CTX ,

try this

EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_init(ctx);
//do sth here
//...
EVP_CIPHER_CTX_free(ctx);

Loess

Which file contain this code or where to change it ? – Shred

@DumitruBoaghi, did you resolve this error ? – Kennard

I am annoyed to have to make this change to everywhere in my old code (in fact i don't have time and it's blocking me from doing other things because of that)... and it's not just as simple as putting a .._free if you have return statements scattered through that now need this added code. – Nesto

Answer 3

wget https://github.com/cisco/libsrtp/archive/v2.1.0.tar.gz
tar xfv v2.1.0.tar.gz
cd libsrtp-2.1.0
./configure --prefix=/usr --enable-openssl
make shared_library && sudo make install

Get the latest version of libsrtp.

Circumflex

Please explain why the code above should resolve this situation. – Ambros

This isn't a solution for me. The structure shouldn't be exposed. The right way is to use the SSL context the right way. See the 'Xt Z' solution below. – Kacykaczer

Answer 4

It appears that there is a dependency on OpenSSL, but the version of OpenSSL you are using is incompatible. You are using OpenSSL 1.1.0 but you need to use OpenSSL 1.0.2

Bloem

Just installed 1.1.0 and tested it, but still getting the same error – Voronezh

As I said in my answer you need to use 1.0.2 not 1.1.0. The errors above result from a mismatch between an application expecting 1.0.2, but using 1.1.0 headers. – Bloem

yeah I thought I had installed 1.0.2 (above comment was a typo) and still failed but after checking I realized the the install did not quite take. Reinstalling now to test again. – Voronezh

Ok so 1.0.2 is installed but still getting the ctx error – Voronezh

@Voronezh did you resolve this error? I am still getting after installing 1.0.2 openssl. – Kennard

@Prateek The answer below was from me. At the time Cepstral was not supported on Debian 8. I had to downgrade and it worked. However, it has been 3+ years so that may not be the issue you are having. – Voronezh

@Joe, I am trying on Ubuntu 20.04 and freeswitch 1.6.14. Facing this same error there. Could it be because of incompatibility in ubuntu and freeswitch versions? – Kennard

@Prateek possibly. Maybe downgrade one version back. Honestly, I haven't touched freeswitch in a few years now so I can't be of much help – Voronezh