Improve the test program.

Add command line options to individually evercise each of the library
functions. Including:

    * sha512 hash of file or string
    * generating public and private keys
    * signing files or sha512 hashes of files.
    * validating those same hashes.
    * running the key exchange function.
    * adding a scalar to public and private keys.

Makefile

@@ -0,0 +1,38 @@
+
+TARGET= ed25519
+FLTO=-flto=8
+CFLAGS=-Wall -Wextra -O3 -fwrapv $(FLTO) $(DEFS)
+CC=gcc
+AR=gcc-ar
+
+LOBJECTS := $(patsubst %.c,%.o,$(wildcard src/*.c))
+
+$(TARGET): test.c ed25519.a
+	$(CC) $(TARGET_ARCH) $(CFLAGS) $(LDFLAGS) -o $@ test.c ed25519.a $(LIBS)
+
+ed25519.a: ed25519.a($(LOBJECTS))
+	touch $@
+
+ed25519.a($(LOBJECTS)):  $(wildcard src/*.h)
+
+$(TARGET): license.h
+
+license.h: license.txt
+	echo '#define LICENSE \' > license.h.tmp
+	sed 's/.*/"&\\n" \\/' < license.txt >> license.h.tmp
+	echo >> license.h.tmp
+	mv license.h.tmp license.h
+
+clean:
+	-rm -f ${TARGET} license.h ed25519.a
+
+test:	$(TARGET)
+	set -x					;\
+	S=$$(./$(TARGET) -r)			&&\
+	P=$$(./$(TARGET) -k $$S)		&&\
+	V=$$(./$(TARGET) -hs $$S Makefile)	&&\
+	./$(TARGET) -hvp $$V $$P Makefile	&&\
+	V=$$(./$(TARGET) -s$$S Makefile)	&&\
+	./$(TARGET) -v$$V -p$$P Makefile	&&\
+	./$(TARGET) -t
+