Document existing dependency of MD_C
Trying to compile MD_C without any of the hash modules would result in a
bunch of unused parameter warning (hence errors in -Werror builds).
We could silence those warnings by casting the parameters to void, but
still, compiling the module in such a configuration would mean all of
its functions are useless (always returning an error).
Seems better to just document the dependency.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 605f11a..badd14c 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -329,6 +329,17 @@
#error "!MBEDTLS_SSL_KEEP_PEER_CERTIFICATE requires MBEDTLS_SHA512_C, MBEDTLS_SHA256_C or MBEDTLS_SHA1_C"
#endif
+#if defined(MBEDTLS_MD_C) && !( \
+ defined(MBEDTLS_MD5_C) || \
+ defined(MBEDTLS_RIPEMD160_C) || \
+ defined(MBEDTLS_SHA1_C) || \
+ defined(MBEDTLS_SHA224_C) || \
+ defined(MBEDTLS_SHA256_C) || \
+ defined(MBEDTLS_SHA384_C) || \
+ defined(MBEDTLS_SHA512_C) )
+#error "MBEDTLS_MD_C defined, but not all prerequisites"
+#endif
+
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && \
( !defined(MBEDTLS_PLATFORM_C) || !defined(MBEDTLS_PLATFORM_MEMORY) )
#error "MBEDTLS_MEMORY_BUFFER_ALLOC_C defined, but not all prerequisites"
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 1c60ec8..31523db 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -2423,6 +2423,9 @@
*
* Enable the generic message digest layer.
*
+ * Requires: one of: MBEDTLS_MD5_C, MBEDTLS_RIPEMD160_C, MBEDTLS_SHA1_C,
+ * MBEDTLS_SHA224_C, MBEDTLS_SHA256_C, MBEDTLS_SHA384_C,
+ * MBEDTLS_SHA512_C.
* Module: library/md.c
* Caller: library/constant_time.c
* library/ecdsa.c