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src: enable clear memory on all platforms

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- convert `_libssh2_explicit_zero()` to macro. This allows inlining
  where supported (e.g. `SecureZeroMemory()`).

- replace `SecureZeroMemory()` (in `wincng.c`) and
  `LIBSSH2_CLEAR_MEMORY`-guarded `memset()` (in `os400qc3.c`) with
  `_libssh2_explicit_zero()` macro.

- delete `LIBSSH2_CLEAR_MEMORY` guards, which enables secure-zeroing
  universally.

- add `LIBSSH2_NO_CLEAR_MEMORY` option to disable secure-zeroing.

- while here, delete double/triple inclusion of `misc.h`.
  `libssh2_priv.h` included it already.

Closes #810
This commit is contained in:
Viktor Szakats
2023-03-07 14:21:46 +00:00
parent 505ea626b6
commit a0e424a51c
17 changed files with 35 additions and 77 deletions
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src/agent.c
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@@ -39,7 +39,6 @@
#include "libssh2_priv.h"
#include "agent.h"
#include "misc.h"
#include <errno.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>