Poco 1.12.x compile error on systems with OpenSSL 1.0.0 (drop support for old OpenSSL)

[gyee-penguin]

Describe the bug
I get a compile error for Poco 1.12.0 and 1.12.2 on CentOS 7 (with GCC 10) or Ubuntu 16 (both have OpenSSL 1.0.0) in the Crypto component. Compilation works for 1.11.1, 1.11.2, and 1.11.3.

To Reproduce
CentOS 7, Use devtoolset-10, Download Poco 1.12.2 source. Compile.

Expected behavior
I didn't see anything in the change log to suggest that OpenSSL 1.0.0 support had been dropped for Poco 1.12.x or that OpenSSL 1.1.1 is required. I thought it would build.

Logs

/opt/rh/devtoolset-10/root/usr/bin/g++  -DPOCO_ENABLE_CPP11 -DPOCO_ENABLE_CPP14 -DPOCO_HAVE_FD_EPOLL -DPOCO_OS_FAMILY_UNIX -DPOCO_STATIC -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_REENTRANT -D_THREAD_SAFE -D_XOPEN_SOURCE=500 -I/home/builder/src/poco_container/poco/Crypto/include -I/home/builder/src/poco_container/poco/Crypto/src -I/home/builder/src/poco_container/poco/Foundation/include -O2 -g -DNDEBUG   -std=gnu++14 -MD -MT Crypto/CMakeFiles/Crypto.dir/src/Envelope.cpp.o -MF Crypto/CMakeFiles/Crypto.dir/src/Envelope.cpp.o.d -o Crypto/CMakeFiles/Crypto.dir/src/Envelope.cpp.o -c /home/builder/src/poco_container/poco/Crypto/src/Envelope.cpp
/home/builder/src/poco_container/poco/Crypto/src/Envelope.cpp: In constructor 'Poco::Crypto::Envelope::Envelope(int)':
/home/builder/src/poco_container/poco/Crypto/src/Envelope.cpp:27:8: error: invalid operands of types 'int' and 'void' to binary 'operator!='
   27 |  if (1 != EVP_CIPHER_CTX_init(_pCtx))
      |      ~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~
      |      |                       |
      |      int                     void

/home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp: In constructor 'Poco::Crypto::{anonymous}::EVPEncryptImpl::EVP
EncryptImpl(const EVP_PKEY*)':
/home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp:87:31: error: invalid conversion from 'const EVP_PKEY*' {aka 'c
onst evp_pkey_st*'} to 'EVP_PKEY*' {aka 'evp_pkey_st*'} [-fpermissive]
   87 |    _blockSize = EVP_PKEY_size(_pEVP);
      |                               ^~~~~
      |                               |
      |                               const EVP_PKEY* {aka const evp_pkey_st*}
In file included from /home/builder/src/poco_container/poco/Crypto/include/Poco/Crypto/EV
PPKey.h:28,
                 from /home/builder/src/poco_container/poco/Crypto/include/Poco/Crypto/EVPCipherImpl.h:23,
                 from /home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp:15:
/usr/include/openssl/evp.h:959:29: note:   initializing argument 1 of 'int EVP_PKEY_size(EVP_PKEY*)'
  959 | int EVP_PKEY_size(EVP_PKEY *pkey);
      |                   ~~~~~~~~~~^~~~
/home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp: In constructor 'Poco::Crypto::{anonymous}::EVPDecryptImpl::EVPDecryptImpl(const EVP_PKEY*)':
/home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp:200:31: error: invalid conversion from 'const EVP_PKEY*' {aka 'const evp_pkey_st*'} to 'EVP_PKEY*' {aka 'evp_pkey_st*'} [-fpermissive]
  200 |    _blockSize = EVP_PKEY_size(_pEVP);
      |                               ^~~~~
      |                               |
      |                               const EVP_PKEY* {aka const evp_pkey_st*}
In file included from /home/builder/src/poco_container/poco/Crypto/include/Poco/Crypto/EVPPKey.h:28,
                 from /home/builder/src/poco_container/poco/Crypto/include/Poco/Crypto/EVPCipherImpl.h:23,
                 from /home/builder/src/poco_container/poco/Crypto/src/EVPCipherImpl.cpp:15:
/usr/include/openssl/evp.h:959:29: note:   initializing argument 1 of 'int EVP_PKEY_size(EVP_PKEY*)'
  959 | int EVP_PKEY_size(EVP_PKEY *pkey);
      |                   ~~~~~~~~~~^~~~

Screenshots
NA

Please add relevant environment information:

• CentOS 7
• POCO Version 1.12.2
• OpenSSL 1.0.2k-fips

Additional context
NA

EDIT: Drop support for old OpenSSL

[aleks-f]

It wasn't intentional, the >10 year span between 1.0 and 3.0 is stretching us thin; if you want to send a devel branch pull to fix it, I'll merge it for 1.12.3 after all the CI passes.

[gyee-penguin]

Sounds good. I'm not sure if I can do this right now, but I may be able to later. Thank you @aleks-f

[gyee-penguin]

Hello @aleks-f, we finally found some time to look into this and we have submitted a PR that should allow this to compile #3909

[gyee-penguin]

I don't think our patch is the cause of the checks failing. I believe the devel branch was failing checks before we rebased our patch top of it, which is why it's failing now.

[gyee-penguin]

Hello @aleks-f @obiltschnig ,

Do either of you know roughly when Poco 1.12.5 is expected to be released and whether our patch for this issue will be part of it?

Thanks!

[github-actions]

This issue is stale because it has been open for 365 days with no activity.

[matejk]

Envelope.cpp was changed in 1.13. Does it compile with OpenSSL 1.0?

OTOH, shall OpenSSL 1.0 still be supported? Even 1.1 reached EOL.

[obiltschnig]

I think we should drop support for OpenSSL < 1.1.1. And any new features we might add should be OpenSSL 3 only.