Dear All,
I don't know if I'm making an error, but with this configuration: Linux Ubuntu 16.04 LTS 64 but, GCC 5.4.0, OpenSSL 1.1.0e, Poco 1.7.8-all and this code:

int main() { const std::string AES_NAME = "aes-128-cbc"; Cipher::Ptr uptrCipher = CipherFactory::defaultFactory().createCipher(CipherKey(AES_NAME, "abcdef", "123456")); std::string plainText = "This is my secret information"; std::string encrypted = uptrCipher->encryptString(plainText, Cipher::ENC_BASE64); return 0; }

if I run Valgrind I got this message:

valgrind --leak-check=full ./CipherTest ==32223== Memcheck, a memory error detector ==32223== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==32223== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info ==32223== Command: ./CipherTest ==32223== ==32223== Invalid free() / delete / delete[] / realloc() ==32223== at 0x4C2F24B: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x5A3F369: __cxa_finalize (cxa_finalize.c:56) ==32223== by 0x687CAB2: ??? (in /usr/local/lib/libPocoFoundationd.so.48) ==32223== by 0x4010C16: _dl_fini (dl-fini.c:235) ==32223== by 0x5A3EFF7: __run_exit_handlers (exit.c:82) ==32223== by 0x5A3F044: exit (exit.c:104) ==32223== by 0x5A25836: (below main) (libc-start.c:325) ==32223== Address 0x737a9d0 is 0 bytes inside a block of size 20 free'd ==32223== at 0x4C2F24B: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x5A3F369: __cxa_finalize (cxa_finalize.c:56) ==32223== by 0x4ED7542: ??? (in /usr/local/lib/libPocoFoundation.so.48) ==32223== by 0x4010C16: _dl_fini (dl-fini.c:235) ==32223== by 0x5A3EFF7: __run_exit_handlers (exit.c:82) ==32223== by 0x5A3F044: exit (exit.c:104) ==32223== by 0x5A25836: (below main) (libc-start.c:325) ==32223== Block was alloc'd at ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x4F69C0C: ??? (in /usr/local/lib/libPocoFoundation.so.48) ==32223== by 0x4ED7212: ??? (in /usr/local/lib/libPocoFoundation.so.48) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== ==32223== HEAP SUMMARY: ==32223== in use at exit: 73,124 bytes in 13 blocks ==32223== total heap usage: 3,914 allocs, 3,912 frees, 256,412 bytes allocated ==32223== ==32223== 18 bytes in 1 blocks are definitely lost in loss record 1 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F40D: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:31) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 20 bytes in 1 blocks are definitely lost in loss record 2 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F165: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:23) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 20 bytes in 1 blocks are definitely lost in loss record 3 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F1BA: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:24) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 20 bytes in 1 blocks are definitely lost in loss record 4 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x6942982: __static_initialization_and_destruction_0(int, int) (URI.cpp:32) ==32223== by 0x6942A63: _GLOBAL__sub_I_URI.cpp (URI.cpp:915) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 21 bytes in 1 blocks are definitely lost in loss record 5 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F3B8: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:30) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 25 bytes in 1 blocks are definitely lost in loss record 6 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F20F: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:25) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 25 bytes in 1 blocks are definitely lost in loss record 7 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F264: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:26) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 25 bytes in 1 blocks are definitely lost in loss record 8 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F2B9: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:27) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 25 bytes in 1 blocks are definitely lost in loss record 9 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F30E: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:28) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 25 bytes in 1 blocks are definitely lost in loss record 10 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x688F363: __static_initialization_and_destruction_0(int, int) (DateTimeFormat.cpp:29) ==32223== by 0x688FB4D: _GLOBAL__sub_I_DateTimeFormat.cpp (DateTimeFormat.cpp:63) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 28 bytes in 1 blocks are definitely lost in loss record 11 of 13 ==32223== at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x558EAEC: void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x558EC4B: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21) ==32223== by 0x6918141: __static_initialization_and_destruction_0(int, int) (RotateStrategy.cpp:47) ==32223== by 0x69181B7: _GLOBAL__sub_I_RotateStrategy.cpp (RotateStrategy.cpp:115) ==32223== by 0x40104E9: call_init.part.0 (dl-init.c:72) ==32223== by 0x40105FA: call_init (dl-init.c:30) ==32223== by 0x40105FA: _dl_init (dl-init.c:120) ==32223== by 0x4000CF9: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so) ==32223== ==32223== 168 bytes in 1 blocks are definitely lost in loss record 12 of 13 ==32223== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==32223== by 0x7038D9D: CRYPTO_zalloc (in /usr/local/lib/libcrypto.so.1.1) ==32223== by 0x5253907: Poco::Crypto::(anonymous namespace)::CryptoTransformImpl::CryptoTransformImpl(evp_cipher_st const*, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, std::allocator<unsigned char> > const&, Poco::Crypto::(anonymous namespace)::CryptoTransformImpl::Direction) (CipherImpl.cpp:100) ==32223== by 0x5253E6F: Poco::Crypto::CipherImpl::createEncryptor() (CipherImpl.cpp:218) ==32223== by 0x5252ACA: Poco::Crypto::Cipher::encrypt(std::istream&, std::ostream&, Poco::Crypto::Cipher::Encoding) (Cipher.cpp:67) ==32223== by 0x52528BB: Poco::Crypto::Cipher::encryptString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Poco::Crypto::Cipher::Encoding) (Cipher.cpp:49) ==32223== by 0x4010FA: main (main.cpp:37) ==32223== ==32223== LEAK SUMMARY: ==32223== definitely lost: 420 bytes in 12 blocks ==32223== indirectly lost: 0 bytes in 0 blocks ==32223== possibly lost: 0 bytes in 0 blocks ==32223== still reachable: 72,704 bytes in 1 blocks ==32223== suppressed: 0 bytes in 0 blocks ==32223== Reachable blocks (those to which a pointer was found) are not shown. ==32223== To see them, rerun with: --leak-check=full --show-leak-kinds=all ==32223== ==32223== For counts of detected and suppressed errors, rerun with: -v ==32223== ERROR SUMMARY: 23 errors from 13 contexts (suppressed: 0 from 0)

Seeing the last statements and following the line that the tools said me from the bottom, I went in Cipher.cpp and CipherImpl.cpp and I found this line:

#if OPENSSL_VERSION_NUMBER >= 0x10100000L _pContext = EVP_CIPHER_CTX_new();
It seems that is not deleted. But I'm sure that I've made same mistake.
Where I wrong?

Thank you.

Cristiano