Declare the actually builtin hash algorithms as such

Even though we're using PSA_CRYPTO_CONFIG, there are situations where
MBEDTLS_PSA_BUILTIN_ALG_[hash] needs to be set from what's actually
compiled into mbedTLS, since the builtin implementation of the relying
algorithms doesn't (yet?) go back to PSA for the hash primitive.

These are currently RSA and deterministic ECDSA.

Signed-off-by: Steven Cooreman <[email protected]>

include/mbedtls/config_psa.h

@@ -355,6 +355,42 @@ extern "C" {
 #endif /* PSA_WANT_KEY_TYPE_CHACHA20 */
 #endif /* PSA_WANT_ALG_CHACHA20_POLY1305 */
 
+/*
+ * Because of the internals, some _BUILTIN_ macros need to be set based on
+ * a combination of previous declarations.
+ */
+
+/* Builtin deterministic ECDSA and RSA both depend on builtin hash functionality.
+ * Therefore, declare the builtin hash algorithms when they're present. */
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
+    defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) || \
+    defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) || \
+    defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
+#if defined(MBEDTLS_MD2_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_MD2 1
+#endif
+#if defined(MBEDTLS_MD4_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_MD4 1
+#endif
+#if defined(MBEDTLS_MD5_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_MD5 1
+#endif
+#if defined(MBEDTLS_RIPEMD160_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_RIPEMD160 1
+#endif
+#if defined(MBEDTLS_SHA1_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_SHA_1 1
+#endif
+#if defined(MBEDTLS_SHA256_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_SHA_224 1
+#define MBEDTLS_PSA_BUILTIN_ALG_SHA_256 1
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#define MBEDTLS_PSA_BUILTIN_ALG_SHA_384 1
+#define MBEDTLS_PSA_BUILTIN_ALG_SHA_512 1
+#endif
+#endif /* Builtin algorithms relying on builtin hashes */
+
 #else /* MBEDTLS_PSA_CRYPTO_CONFIG */
 
 /*