MD no longer depends on a built-in hash

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 08874e3..ffaeccb 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -398,7 +398,15 @@
     defined(MBEDTLS_SHA224_C) || \
     defined(MBEDTLS_SHA256_C) || \
     defined(MBEDTLS_SHA384_C) || \
-    defined(MBEDTLS_SHA512_C) )
+    defined(MBEDTLS_SHA512_C) || \
+    (defined(MBEDTLS_PSA_CRYPTO_C) && \
+     (defined(PSA_WANT_ALG_MD5) || \
+      defined(PSA_WANT_ALG_RIPEMD160) || \
+      defined(PSA_WANT_ALG_SHA_1) || \
+      defined(PSA_WANT_ALG_SHA_224) || \
+      defined(PSA_WANT_ALG_SHA_256) || \
+      defined(PSA_WANT_ALG_SHA_384) || \
+      defined(PSA_WANT_ALG_SHA_512))))
 #error "MBEDTLS_MD_C defined, but not all prerequisites"
 #endif
 
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index d889e7e..bf88f61 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -2644,7 +2644,8 @@
  *
  * Requires: one of: MBEDTLS_MD5_C, MBEDTLS_RIPEMD160_C, MBEDTLS_SHA1_C,
  *                   MBEDTLS_SHA224_C, MBEDTLS_SHA256_C, MBEDTLS_SHA384_C,
- *                   MBEDTLS_SHA512_C.
+ *                   MBEDTLS_SHA512_C, or MBEDTLS_PSA_CRYPTO_C with a least
+ *                   one hash.
  * Module:  library/md.c
  * Caller:  library/constant_time.c
  *          library/ecdsa.c