New utility program psa/psa_constant_names

Print the symbolic name corresponding to a numerical value.

Supported types: status values, algorithms, elliptic curves,
key types, key usage masks.

The program is partly generated from parsing psa/crypto.h with a few
hard-coded assumptions. This isn't ideal but it works and requires
little machinery.
diff --git a/programs/Makefile b/programs/Makefile
index b6d1fa2..c65a10c 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -60,6 +60,7 @@
 	pkey/rsa_decrypt$(EXEXT)	pkey/rsa_encrypt$(EXEXT)	\
 	pkey/rsa_sign$(EXEXT)		pkey/rsa_verify$(EXEXT)		\
 	pkey/rsa_sign_pss$(EXEXT)	pkey/rsa_verify_pss$(EXEXT)	\
+	psa/psa_constant_names$(EXEXT)	\
 	ssl/dtls_client$(EXEXT)		ssl/dtls_server$(EXEXT)		\
 	ssl/ssl_client1$(EXEXT)		ssl/ssl_client2$(EXEXT)		\
 	ssl/ssl_server$(EXEXT)		ssl/ssl_server2$(EXEXT)		\
@@ -83,6 +84,8 @@
 APPS += test/cpp_dummy_build$(EXEXT)
 endif
 
+EXTRA_GENERATED =
+
 .SILENT:
 
 .PHONY: all clean list
@@ -92,6 +95,11 @@
 $(DEP):
 	$(MAKE) -C ../library
 
+EXTRA_GENERATED += psa/psa_constant_names_generated.c
+psa/psa_constant_names$(EXEXT): psa/psa_constant_names_generated.c
+psa/psa_constant_names_generated.c: ../scripts/generate_psa_constants.py ../include/psa/crypto.h
+	../scripts/generate_psa_constants.py
+
 aes/aescrypt2$(EXEXT): aes/aescrypt2.c $(DEP)
 	echo "  CC    aes/aescrypt2.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) aes/aescrypt2.c    $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
@@ -188,6 +196,10 @@
 	echo "  CC    pkey/rsa_encrypt.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/rsa_encrypt.c    $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
+psa/psa_constant_names$(EXEXT): psa/psa_constant_names.c $(DEP)
+	echo "  CC    psa/psa_constant_names.c"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) psa/psa_constant_names.c    $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
 random/gen_entropy$(EXEXT): random/gen_entropy.c $(DEP)
 	echo "  CC    random/gen_entropy.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) random/gen_entropy.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
@@ -294,9 +306,9 @@
 
 clean:
 ifndef WINDOWS
-	rm -f $(APPS)
+	rm -f $(APPS) $(EXTRA_GENERATED)
 else
-	del /S /Q /F *.o *.exe
+	del /S /Q /F *.o *.exe $(EXTRA_GENERATED)
 endif
 
 list: