error 0
 crypto_sign does not handle m=c overlap
 ==3217== Memcheck, a memory error detector
 ==3217== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==3217== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==3217== Command: ./try
 ==3217==
 ==3217==
 ==3217== HEAP SUMMARY:
 ==3217==     in use at exit: 582,850 bytes in 10 blocks
 ==3217==   total heap usage: 10,576 allocs, 10,566 frees, 1,581,064 bytes allocated
 ==3217==
 ==3217== LEAK SUMMARY:
 ==3217==    definitely lost: 0 bytes in 0 blocks
 ==3217==    indirectly lost: 0 bytes in 0 blocks
 ==3217==      possibly lost: 582,850 bytes in 10 blocks
 ==3217==    still reachable: 0 bytes in 0 blocks
 ==3217==         suppressed: 0 bytes in 0 blocks
 ==3217== Rerun with --leak-check=full to see details of leaked memory
 ==3217==
 ==3217== For lists of detected and suppressed errors, rerun with: -s
 ==3217== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)