Import mbedtls-3.6.0

Imports Mbed TLS 3.6.0 from https://github.com/Mbed-TLS/mbedtls.git
tags mbedtls-3.6.0, v3.6.0

Files that are not needed are removed:

cd lib/libmbedtls
rm -rf mbedtls
cp -R path/to/mbedtls-3.6.0/mbedtls .
cd mbedtls
rm CMakeLists.txt DartConfiguration.tcl Makefile
rm .gitignore .travis.yml .pylintrc .globalrc .mypy.ini BRANCHES.md
rm include/.gitignore include/CMakeLists.txt library/.gitignore
rm library/CMakeLists.txt library/Makefile
rm -r cmake
rm -rf .git .github doxygen configs programs scripts tests visualc
rm -rf 3rdparty ChangeLog.d docs pkgconfig .gitmodules .readthedocs.yaml
rm library/mps_*
cd ..
git add mbedtls

This time we leave library/psa_* present to enable TLS 1.3 features.

This is a complete overwrite of previous code so earlier changes in the
previous branch import/mbedtls-3.4.0 will be added on top of this commit.

Signed-off-by: Tom Van Eyck <tom.vaneyck@kuleuven.be>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/lib/libmbedtls/mbedtls/library/sha1.c b/lib/libmbedtls/mbedtls/library/sha1.c
index 4c9cbf5..dfbe481 100644
--- a/lib/libmbedtls/mbedtls/library/sha1.c
+++ b/lib/libmbedtls/mbedtls/library/sha1.c
@@ -2,19 +2,7 @@
  *  FIPS-180-1 compliant SHA-1 implementation
  *
  *  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.
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
  */
 /*
  *  The SHA-1 standard was published by NIST in 1993.
@@ -322,7 +310,7 @@
         memset(ctx->buffer + used, 0, 64 - used);
 
         if ((ret = mbedtls_internal_sha1_process(ctx, ctx->buffer)) != 0) {
-            return ret;
+            goto exit;
         }
 
         memset(ctx->buffer, 0, 56);
@@ -339,7 +327,7 @@
     MBEDTLS_PUT_UINT32_BE(low,  ctx->buffer, 60);
 
     if ((ret = mbedtls_internal_sha1_process(ctx, ctx->buffer)) != 0) {
-        return ret;
+        goto exit;
     }
 
     /*
@@ -351,7 +339,11 @@
     MBEDTLS_PUT_UINT32_BE(ctx->state[3], output, 12);
     MBEDTLS_PUT_UINT32_BE(ctx->state[4], output, 16);
 
-    return 0;
+    ret = 0;
+
+exit:
+    mbedtls_sha1_free(ctx);
+    return ret;
 }
 
 #endif /* !MBEDTLS_SHA1_ALT */
@@ -382,7 +374,6 @@
 
 exit:
     mbedtls_sha1_free(&ctx);
-
     return ret;
 }