error 0
 crypto_sign does not handle m=c overlap
 ==475== Memcheck, a memory error detector
 ==475== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==475== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==475== Command: ./try
 ==475==
 ==475==
 ==475== HEAP SUMMARY:
 ==475==     in use at exit: 383,560 bytes in 10 blocks
 ==475==   total heap usage: 9,913 allocs, 9,903 frees, 1,084,810 bytes allocated
 ==475==
 ==475== LEAK SUMMARY:
 ==475==    definitely lost: 0 bytes in 0 blocks
 ==475==    indirectly lost: 0 bytes in 0 blocks
 ==475==      possibly lost: 383,560 bytes in 10 blocks
 ==475==    still reachable: 0 bytes in 0 blocks
 ==475==         suppressed: 0 bytes in 0 blocks
 ==475== Rerun with --leak-check=full to see details of leaked memory
 ==475==
 ==475== For lists of detected and suppressed errors, rerun with: -s
 ==475== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)