Introduce mkpasswd, a pure-C host tool for generating encrypted password
files at build time using TEA encryption. This enables secure,
credential-free firmware images while allowing build-time password
configuration.
Changes:
* Add mkpasswd.c host tool for TEA-based password hashing and encryption
* Integrate mkpasswd into Make build system (tools/Makefile.host)
* Add CMake support for mkpasswd compilation and ROMFS passwd generation
* Add CONFIG_BOARD_ETC_ROMFS_PASSWD_* configuration options to Kconfig
* Implement credential exclusion from defconfig to prevent password leaking
* Update savedefconfig.cmake to strip sensitive credentials
* Fix mkdir() portability for Windows Native builds (CONFIG_WINDOWS_NATIVE)
* Change default username from "admin" to "root" (POSIX convention)
* Improve build-failure error message with full menuconfig navigation path
BREAKING CHANGE: Boards enabling CONFIG_BOARD_ETC_ROMFS_PASSWD_ENABLE
must set CONFIG_BOARD_ETC_ROMFS_PASSWD_PASSWORD to a non-empty string
of at least 8 characters. The build now fails with an explicit error if
this config is left empty. To fix: run 'make menuconfig' and navigate to:
Board Selection --->
Auto-generate /etc/passwd at build time --->
Admin password
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
Abhishek Mishra
ab6b1fd6f9