error 0
 crypto_sign does not handle m=c overlap
 ==597== Memcheck, a memory error detector
 ==597== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==597== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==597== Command: ./try
 ==597==
 ==597==
 ==597== HEAP SUMMARY:
 ==597==     in use at exit: 383,560 bytes in 10 blocks
 ==597==   total heap usage: 9,913 allocs, 9,903 frees, 1,084,810 bytes allocated
 ==597==
 ==597== LEAK SUMMARY:
 ==597==    definitely lost: 0 bytes in 0 blocks
 ==597==    indirectly lost: 0 bytes in 0 blocks
 ==597==      possibly lost: 383,560 bytes in 10 blocks
 ==597==    still reachable: 0 bytes in 0 blocks
 ==597==         suppressed: 0 bytes in 0 blocks
 ==597== Rerun with --leak-check=full to see details of leaked memory
 ==597==
 ==597== For lists of detected and suppressed errors, rerun with: -s
 ==597== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)