From eca0178cfa5811bda30a41b82aedf12dc08b9afd Mon Sep 17 00:00:00 2001
From: Gilles Peskine <Gilles.Peskine@arm.com>
Date: Mon, 4 Sep 2023 16:58:54 +0200
Subject: [PATCH] Split config_psa.h: create and populate
 mbedtls/config_adjust_psa_superset_legacy.h

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
---
 .../config_adjust_psa_superset_legacy.h       | 73 +++++++++++++++++++
 include/mbedtls/config_psa.h                  | 43 +----------
 2 files changed, 74 insertions(+), 42 deletions(-)
 create mode 100644 include/mbedtls/config_adjust_psa_superset_legacy.h

diff --git a/include/mbedtls/config_adjust_psa_superset_legacy.h b/include/mbedtls/config_adjust_psa_superset_legacy.h
new file mode 100644
index 0000000000..1738560663
--- /dev/null
+++ b/include/mbedtls/config_adjust_psa_superset_legacy.h
@@ -0,0 +1,73 @@
+/**
+ * \file mbedtls/config_adjust_psa_superset_legacy.h
+ * \brief Adjust PSA configuration: automatic enablement from legacy
+ *
+ * To simplify some edge cases, we automatically enable certain cryptographic
+ * mechanisms in the PSA API if they are enabled in the legacy API. The general
+ * idea is that if legacy module M uses mechanism A internally, and A has
+ * both a legacy and a PSA implementation, we enable A through PSA whenever
+ * it's enabled through legacy. This facilitates the transition to PSA
+ * implementations of A for users of M.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef MBEDTLS_CONFIG_ADJUST_PSA_SUPERSET_LEGACY_H
+#define MBEDTLS_CONFIG_ADJUST_PSA_SUPERSET_LEGACY_H
+
+/****************************************************************/
+/* Hashes that are built in are also enabled in PSA.
+ * This simplifies dependency declarations especially
+ * for modules that obey MBEDTLS_USE_PSA_CRYPTO. */
+/****************************************************************/
+
+#if defined(MBEDTLS_MD5_C)
+#define PSA_WANT_ALG_MD5 1
+#endif
+
+#if defined(MBEDTLS_RIPEMD160_C)
+#define PSA_WANT_ALG_RIPEMD160 1
+#endif
+
+#if defined(MBEDTLS_SHA1_C)
+#define PSA_WANT_ALG_SHA_1 1
+#endif
+
+#if defined(MBEDTLS_SHA224_C)
+#define PSA_WANT_ALG_SHA_224 1
+#endif
+
+#if defined(MBEDTLS_SHA256_C)
+#define PSA_WANT_ALG_SHA_256 1
+#endif
+
+#if defined(MBEDTLS_SHA384_C)
+#define PSA_WANT_ALG_SHA_384 1
+#endif
+
+#if defined(MBEDTLS_SHA512_C)
+#define PSA_WANT_ALG_SHA_512 1
+#endif
+
+#if defined(MBEDTLS_SHA3_C)
+#define PSA_WANT_ALG_SHA3_224 1
+#define PSA_WANT_ALG_SHA3_256 1
+#define PSA_WANT_ALG_SHA3_384 1
+#define PSA_WANT_ALG_SHA3_512 1
+#endif
+
+#endif /* MBEDTLS_CONFIG_ADJUST_PSA_SUPERSET_LEGACY_H */
diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index ed8429133c..5fe36df0cf 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -34,48 +34,7 @@
 
 #include "psa/crypto_adjust_config_synonyms.h"
 
-
-/****************************************************************/
-/* Hashes that are built in are also enabled in PSA.
- * This simplifies dependency declarations especially
- * for modules that obey MBEDTLS_USE_PSA_CRYPTO. */
-/****************************************************************/
-
-#if defined(MBEDTLS_MD5_C)
-#define PSA_WANT_ALG_MD5 1
-#endif
-
-#if defined(MBEDTLS_RIPEMD160_C)
-#define PSA_WANT_ALG_RIPEMD160 1
-#endif
-
-#if defined(MBEDTLS_SHA1_C)
-#define PSA_WANT_ALG_SHA_1 1
-#endif
-
-#if defined(MBEDTLS_SHA224_C)
-#define PSA_WANT_ALG_SHA_224 1
-#endif
-
-#if defined(MBEDTLS_SHA256_C)
-#define PSA_WANT_ALG_SHA_256 1
-#endif
-
-#if defined(MBEDTLS_SHA384_C)
-#define PSA_WANT_ALG_SHA_384 1
-#endif
-
-#if defined(MBEDTLS_SHA512_C)
-#define PSA_WANT_ALG_SHA_512 1
-#endif
-
-#if defined(MBEDTLS_SHA3_C)
-#define PSA_WANT_ALG_SHA3_224 1
-#define PSA_WANT_ALG_SHA3_256 1
-#define PSA_WANT_ALG_SHA3_384 1
-#define PSA_WANT_ALG_SHA3_512 1
-#endif
-
+#include "mbedtls/config_adjust_psa_superset_legacy.h"
 
 /****************************************************************/
 /* Require built-in implementations based on PSA requirements */