add encrypting for save files

add libhydrogen for encrypting and decrypting

#9

libs/libhydrogen/Makefile

@@ -0,0 +1,61 @@
+PREFIX ?= /usr/local
+WFLAGS ?= -Wall -Wextra -Wmissing-prototypes -Wdiv-by-zero -Wbad-function-cast -Wcast-align -Wcast-qual -Wfloat-equal -Wmissing-declarations -Wnested-externs -Wno-unknown-pragmas -Wpointer-arith -Wredundant-decls -Wstrict-prototypes -Wswitch-enum -Wno-type-limits
+CFLAGS ?= -Os -mtune=native -fno-exceptions $(WFLAGS)
+CFLAGS += -I.
+OBJ = hydrogen.o
+AR ?= ar
+RANLIB ?= ranlib
+
+SRC = \
+	hydrogen.c \
+	hydrogen.h \
+	impl/common.h \
+	impl/core.h \
+	impl/gimli-core.h \
+	impl/hash.h \
+	impl/hydrogen_p.h \
+	impl/kdf.h \
+	impl/kx.h \
+	impl/pwhash.h \
+	impl/random.h \
+	impl/secretbox.h \
+	impl/sign.h \
+	impl/x25519.h
+
+all: lib test
+
+lib: libhydrogen.a
+
+install: lib
+	mkdir -p $(PREFIX)/lib
+	install -o 0 -g 0 -m 0755 libhydrogen.a $(PREFIX)/lib 2> /dev/null || install -m 0755 libhydrogen.a $(PREFIX)/lib
+	mkdir -p $(PREFIX)/include
+	install -o 0 -g 0 -m 0644 hydrogen.h $(PREFIX)/include 2> /dev/null || install -m 0644 hydrogen.h $(PREFIX)/include
+	ldconfig 2> /dev/null || true
+
+uninstall:
+	rm -f $(PREFIX)/lib/libhydrogen.a
+	rm -f $(PREFIX)/include/hydrogen.h
+
+test: tests/tests
+	rm -f tests/tests.done
+	tests/tests && touch tests/tests.done
+
+tests/tests: $(SRC) tests/tests.c
+	$(CC) $(CFLAGS) -O3 -o tests/tests hydrogen.c tests/tests.c
+
+$(OBJ): $(SRC)
+
+libhydrogen.a: $(OBJ)
+	$(AR) -r $@ $^
+	$(RANLIB) $@
+
+.PHONY: clean
+
+clean:
+	rm -f libhydrogen.a $(OBJ)
+	rm -f tests/tests tests/*.done
+
+check: test
+
+distclean: clean