error 0
 crypto_sign does not handle m=c overlap
 ==3276== Memcheck, a memory error detector
 ==3276== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==3276== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==3276== Command: ./try
 ==3276==
 ==3276==
 ==3276== HEAP SUMMARY:
 ==3276==     in use at exit: 582,850 bytes in 10 blocks
 ==3276==   total heap usage: 10,576 allocs, 10,566 frees, 1,581,064 bytes allocated
 ==3276==
 ==3276== LEAK SUMMARY:
 ==3276==    definitely lost: 0 bytes in 0 blocks
 ==3276==    indirectly lost: 0 bytes in 0 blocks
 ==3276==      possibly lost: 582,850 bytes in 10 blocks
 ==3276==    still reachable: 0 bytes in 0 blocks
 ==3276==         suppressed: 0 bytes in 0 blocks
 ==3276== Rerun with --leak-check=full to see details of leaked memory
 ==3276==
 ==3276== For lists of detected and suppressed errors, rerun with: -s
 ==3276== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)