error 0
 crypto_encrypt_open returns nonzero
 ==3421== Memcheck, a memory error detector
 ==3421== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==3421== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==3421== Command: ./try
 ==3421==
 ==3421==
 ==3421== HEAP SUMMARY:
 ==3421==     in use at exit: 11,266,992 bytes in 12 blocks
 ==3421==   total heap usage: 30 allocs, 18 frees, 11,286,976 bytes allocated
 ==3421==
 ==3421== LEAK SUMMARY:
 ==3421==    definitely lost: 0 bytes in 0 blocks
 ==3421==    indirectly lost: 0 bytes in 0 blocks
 ==3421==      possibly lost: 11,266,560 bytes in 10 blocks
 ==3421==    still reachable: 432 bytes in 2 blocks
 ==3421==         suppressed: 0 bytes in 0 blocks
 ==3421== Rerun with --leak-check=full to see details of leaked memory
 ==3421==
 ==3421== For lists of detected and suppressed errors, rerun with: -s
 ==3421== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)