diff --git a/ChangeLog.d/fix-issue-x509-cert_req.txt b/ChangeLog.d/fix-issue-x509-cert_req.txt
new file mode 100644
index 0000000..3a5171b
--- /dev/null
+++ b/ChangeLog.d/fix-issue-x509-cert_req.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix possible NULL dereference issue in X509 cert_req program if an entry
+     in the san parameter is not separated by a colon.
diff --git a/ChangeLog.d/fix-issue-x509-cert_write.txt b/ChangeLog.d/fix-issue-x509-cert_write.txt
new file mode 100644
index 0000000..43d67c2
--- /dev/null
+++ b/ChangeLog.d/fix-issue-x509-cert_write.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix possible NULL dereference issue in X509 cert_write program if an entry
+     in the san parameter is not separated by a colon.
diff --git a/include/mbedtls/config_adjust_legacy_crypto.h b/include/mbedtls/config_adjust_legacy_crypto.h
index 53c03b5..60664c3 100644
--- a/include/mbedtls/config_adjust_legacy_crypto.h
+++ b/include/mbedtls/config_adjust_legacy_crypto.h
@@ -56,6 +56,120 @@
 #define MBEDTLS_MD_LIGHT
 #endif
 
+#if defined(MBEDTLS_MD_LIGHT)
+/*
+ * - MBEDTLS_MD_CAN_xxx is defined if the md module can perform xxx.
+ * - MBEDTLS_MD_xxx_VIA_PSA is defined if the md module may perform xxx via PSA
+ *   (see below).
+ * - MBEDTLS_MD_SOME_PSA is defined if at least one algorithm may be performed
+ *   via PSA (see below).
+ * - MBEDTLS_MD_SOME_LEGACY is defined if at least one algorithm may be performed
+ *   via a direct legacy call (see below).
+ *
+ * The md module performs an algorithm via PSA if there is a PSA hash
+ * accelerator and the PSA driver subsytem is initialized at the time the
+ * operation is started, and makes a direct legacy call otherwise.
+ */
+
+/* PSA accelerated implementations */
+#if defined(MBEDTLS_PSA_CRYPTO_C)
+
+#if defined(MBEDTLS_PSA_ACCEL_ALG_MD5)
+#define MBEDTLS_MD_CAN_MD5
+#define MBEDTLS_MD_MD5_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_1)
+#define MBEDTLS_MD_CAN_SHA1
+#define MBEDTLS_MD_SHA1_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_224)
+#define MBEDTLS_MD_CAN_SHA224
+#define MBEDTLS_MD_SHA224_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_256)
+#define MBEDTLS_MD_CAN_SHA256
+#define MBEDTLS_MD_SHA256_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_384)
+#define MBEDTLS_MD_CAN_SHA384
+#define MBEDTLS_MD_SHA384_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_512)
+#define MBEDTLS_MD_CAN_SHA512
+#define MBEDTLS_MD_SHA512_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_RIPEMD160)
+#define MBEDTLS_MD_CAN_RIPEMD160
+#define MBEDTLS_MD_RIPEMD160_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_224)
+#define MBEDTLS_MD_CAN_SHA3_224
+#define MBEDTLS_MD_SHA3_224_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_256)
+#define MBEDTLS_MD_CAN_SHA3_256
+#define MBEDTLS_MD_SHA3_256_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_384)
+#define MBEDTLS_MD_CAN_SHA3_384
+#define MBEDTLS_MD_SHA3_384_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_512)
+#define MBEDTLS_MD_CAN_SHA3_512
+#define MBEDTLS_MD_SHA3_512_VIA_PSA
+#define MBEDTLS_MD_SOME_PSA
+#endif
+#endif /* MBEDTLS_PSA_CRYPTO_C */
+
+/* Built-in implementations */
+#if defined(MBEDTLS_MD5_C)
+#define MBEDTLS_MD_CAN_MD5
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA1_C)
+#define MBEDTLS_MD_CAN_SHA1
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA224_C)
+#define MBEDTLS_MD_CAN_SHA224
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA256_C)
+#define MBEDTLS_MD_CAN_SHA256
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA384_C)
+#define MBEDTLS_MD_CAN_SHA384
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#define MBEDTLS_MD_CAN_SHA512
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_SHA3_C)
+#define MBEDTLS_MD_CAN_SHA3_224
+#define MBEDTLS_MD_CAN_SHA3_256
+#define MBEDTLS_MD_CAN_SHA3_384
+#define MBEDTLS_MD_CAN_SHA3_512
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+#if defined(MBEDTLS_RIPEMD160_C)
+#define MBEDTLS_MD_CAN_RIPEMD160
+#define MBEDTLS_MD_SOME_LEGACY
+#endif
+
+#endif /* MBEDTLS_MD_LIGHT */
+
 /* MBEDTLS_ECP_LIGHT is auto-enabled by the following symbols:
  * - MBEDTLS_ECP_C because now it consists of MBEDTLS_ECP_LIGHT plus functions
  *   for curve arithmetic. As a consequence if MBEDTLS_ECP_C is required for
diff --git a/include/mbedtls/md.h b/include/mbedtls/md.h
index c9a7858..e5b30d0 100644
--- a/include/mbedtls/md.h
+++ b/include/mbedtls/md.h
@@ -32,120 +32,6 @@
 #include "mbedtls/build_info.h"
 #include "mbedtls/platform_util.h"
 
-#if defined(MBEDTLS_MD_LIGHT)
-
-/*
- * - MBEDTLS_MD_CAN_xxx is defined if the md module can perform xxx.
- * - MBEDTLS_MD_xxx_VIA_PSA is defined if the md module may perform xxx via PSA
- *   (see below).
- * - MBEDTLS_MD_SOME_PSA is defined if at least one algorithm may be performed
- *   via PSA (see below).
- * - MBEDTLS_MD_SOME_LEGACY is defined if at least one algorithm may be performed
- *   via a direct legacy call (see below).
- *
- * The md module performs an algorithm via PSA if there is a PSA hash
- * accelerator and the PSA driver subsytem is initialized at the time the
- * operation is started, and makes a direct legacy call otherwise.
- */
-
-/* PSA accelerated implementations */
-#if defined(MBEDTLS_PSA_CRYPTO_C)
-#if defined(MBEDTLS_PSA_ACCEL_ALG_MD5)
-#define MBEDTLS_MD_CAN_MD5
-#define MBEDTLS_MD_MD5_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_1)
-#define MBEDTLS_MD_CAN_SHA1
-#define MBEDTLS_MD_SHA1_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_224)
-#define MBEDTLS_MD_CAN_SHA224
-#define MBEDTLS_MD_SHA224_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_256)
-#define MBEDTLS_MD_CAN_SHA256
-#define MBEDTLS_MD_SHA256_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_384)
-#define MBEDTLS_MD_CAN_SHA384
-#define MBEDTLS_MD_SHA384_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA_512)
-#define MBEDTLS_MD_CAN_SHA512
-#define MBEDTLS_MD_SHA512_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_RIPEMD160)
-#define MBEDTLS_MD_CAN_RIPEMD160
-#define MBEDTLS_MD_RIPEMD160_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_224)
-#define MBEDTLS_MD_CAN_SHA3_224
-#define MBEDTLS_MD_SHA3_224_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_256)
-#define MBEDTLS_MD_CAN_SHA3_256
-#define MBEDTLS_MD_SHA3_256_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_384)
-#define MBEDTLS_MD_CAN_SHA3_384
-#define MBEDTLS_MD_SHA3_384_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#if defined(MBEDTLS_PSA_ACCEL_ALG_SHA3_512)
-#define MBEDTLS_MD_CAN_SHA3_512
-#define MBEDTLS_MD_SHA3_512_VIA_PSA
-#define MBEDTLS_MD_SOME_PSA
-#endif
-#endif /* MBEDTLS_PSA_CRYPTO_C */
-
-/* Built-in implementations */
-#if defined(MBEDTLS_MD5_C)
-#define MBEDTLS_MD_CAN_MD5
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA1_C)
-#define MBEDTLS_MD_CAN_SHA1
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA224_C)
-#define MBEDTLS_MD_CAN_SHA224
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA256_C)
-#define MBEDTLS_MD_CAN_SHA256
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA384_C)
-#define MBEDTLS_MD_CAN_SHA384
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA512_C)
-#define MBEDTLS_MD_CAN_SHA512
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_SHA3_C)
-#define MBEDTLS_MD_CAN_SHA3_224
-#define MBEDTLS_MD_CAN_SHA3_256
-#define MBEDTLS_MD_CAN_SHA3_384
-#define MBEDTLS_MD_CAN_SHA3_512
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-#if defined(MBEDTLS_RIPEMD160_C)
-#define MBEDTLS_MD_CAN_RIPEMD160
-#define MBEDTLS_MD_SOME_LEGACY
-#endif
-
-#endif /* MBEDTLS_MD_LIGHT */
-
 /** The selected feature is not available. */
 #define MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE                -0x5080
 /** Bad input parameters to function. */
diff --git a/library/pk_internal.h b/library/pk_internal.h
index 004660e..2d519be 100644
--- a/library/pk_internal.h
+++ b/library/pk_internal.h
@@ -44,7 +44,7 @@
                                                                     psa_pk_status_to_mbedtls)
 #endif
 
-#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
+#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
 /**
  * Public function mbedtls_pk_ec() can be used to get direct access to the
  * wrapped ecp_keypair structure pointed to the pk_ctx. However this is not
@@ -80,7 +80,9 @@
             return NULL;
     }
 }
+#endif /* !MBEDTLS_PK_USE_PSA_EC_DATA */
 
+#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
 static inline mbedtls_ecp_group_id mbedtls_pk_get_group_id(const mbedtls_pk_context *pk)
 {
     mbedtls_ecp_group_id id;
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 1faf1dd..739b077 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -73,7 +73,6 @@
 #include "mbedtls/error.h"
 #include "mbedtls/gcm.h"
 #include "mbedtls/md5.h"
-#include "mbedtls/md.h"
 #include "mbedtls/pk.h"
 #include "pk_wrap.h"
 #include "mbedtls/platform_util.h"
diff --git a/library/rsa.c b/library/rsa.c
index 3c538bf..802bf5d 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -2431,7 +2431,6 @@
 
 #if defined(MBEDTLS_SELF_TEST)
 
-#include "mbedtls/md.h"
 
 /*
  * Example RSA-1024 keypair, for test purposes
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index 6ebd506..6367e46 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -676,7 +676,7 @@
                                uint16_t *curves_tls_id)
 {
     uint16_t *curr_tls_id = curves_tls_id;
-    mbedtls_ecp_group_id grp_id = mbedtls_pk_ec_ro(*pk)->grp.id;
+    mbedtls_ecp_group_id grp_id = mbedtls_pk_get_group_id(pk);
     mbedtls_ecp_group_id curr_grp_id;
 
     while (*curr_tls_id != 0) {
@@ -2600,9 +2600,9 @@
 }
 #endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
 
-#if defined(MBEDTLS_USE_PSA_CRYPTO) &&                      \
-    (defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
+#if (defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
     defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED))
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_get_ecdh_params_from_cert(mbedtls_ssl_context *ssl)
 {
@@ -2712,8 +2712,7 @@
 
     return ret;
 }
-#elif defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
+#else /* MBEDTLS_USE_PSA_CRYPTO */
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_get_ecdh_params_from_cert(mbedtls_ssl_context *ssl)
 {
@@ -2739,6 +2738,7 @@
 
     return 0;
 }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
           MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
 
diff --git a/library/x509write.c b/library/x509write.c
index cd3c739..5628c29 100644
--- a/library/x509write.c
+++ b/library/x509write.c
@@ -25,7 +25,6 @@
 #include "mbedtls/oid.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/platform_util.h"
-#include "mbedtls/md.h"
 
 #include <string.h>
 #include <stdint.h>
diff --git a/programs/demo_common.sh b/programs/demo_common.sh
new file mode 100644
index 0000000..d8fcda5
--- /dev/null
+++ b/programs/demo_common.sh
@@ -0,0 +1,137 @@
+## Common shell functions used by demo scripts programs/*/*.sh.
+
+## How to write a demo script
+## ==========================
+##
+## Include this file near the top of each demo script:
+##   . "${0%/*}/../demo_common.sh"
+##
+## Start with a "msg" call that explains the purpose of the script.
+## Then call the "depends_on" function to ensure that all config
+## dependencies are met.
+##
+## As the last thing in the script, call the cleanup function.
+##
+## You can use the functions and variables described below.
+
+set -e -u
+
+## $root_dir is the root directory of the Mbed TLS source tree.
+root_dir="${0%/*}"
+# Find a nice path to the root directory, avoiding unnecessary "../".
+# The code supports demo scripts nested up to 4 levels deep.
+# The code works no matter where the demo script is relative to the current
+# directory, even if it is called with a relative path.
+n=4 # limit the search depth
+while ! [ -d "$root_dir/programs" ] || ! [ -d "$root_dir/library" ]; do
+  if [ $n -eq 0 ]; then
+    echo >&2 "This doesn't seem to be an Mbed TLS source tree."
+    exit 125
+  fi
+  n=$((n - 1))
+  case $root_dir in
+    .) root_dir="..";;
+    ..|?*/..) root_dir="$root_dir/..";;
+    ?*/*) root_dir="${root_dir%/*}";;
+    /*) root_dir="/";;
+    *) root_dir=".";;
+  esac
+done
+
+## $programs_dir is the directory containing the sample programs.
+# Assume an in-tree build.
+programs_dir="$root_dir/programs"
+
+## msg LINE...
+## msg <TEXT_ORIGIN
+## Display an informational message.
+msg () {
+  if [ $# -eq 0 ]; then
+    sed 's/^/# /'
+  else
+    for x in "$@"; do
+      echo "# $x"
+    done
+  fi
+}
+
+## run "Message" COMMAND ARGUMENT...
+## Display the message, then run COMMAND with the specified arguments.
+run () {
+    echo
+    echo "# $1"
+    shift
+    echo "+ $*"
+    "$@"
+}
+
+## Like '!', but stop on failure with 'set -e'
+not () {
+  if "$@"; then false; fi
+}
+
+## run_bad "Message" COMMAND ARGUMENT...
+## Like run, but the command is expected to fail.
+run_bad () {
+  echo
+  echo "$1 This must fail."
+  shift
+  echo "+ ! $*"
+  not "$@"
+}
+
+## config_has SYMBOL...
+## Succeeds if the library configuration has all SYMBOLs set.
+config_has () {
+  for x in "$@"; do
+    "$programs_dir/test/query_compile_time_config" "$x"
+  done
+}
+
+## depends_on SYMBOL...
+## Exit if the library configuration does not have all SYMBOLs set.
+depends_on () {
+  m=
+  for x in "$@"; do
+    if ! config_has "$x"; then
+      m="$m $x"
+    fi
+  done
+  if [ -n "$m" ]; then
+    cat >&2 <<EOF
+$0: this demo requires the following
+configuration options to be enabled at compile time:
+ $m
+EOF
+    # Exit with a success status so that this counts as a pass for run_demos.py.
+    exit
+  fi
+}
+
+## Add the names of files to clean up to this whitespace-separated variable.
+## The file names must not contain whitespace characters.
+files_to_clean=
+
+## Call this function at the end of each script.
+## It is called automatically if the script is killed by a signal.
+cleanup () {
+  rm -f -- $files_to_clean
+}
+
+
+
+################################################################
+## End of the public interfaces. Code beyond this point is not
+## meant to be called directly from a demo script.
+
+trap 'cleanup; trap - HUP; kill -HUP $$' HUP
+trap 'cleanup; trap - INT; kill -INT $$' INT
+trap 'cleanup; trap - TERM; kill -TERM $$' TERM
+
+if config_has MBEDTLS_ENTROPY_NV_SEED; then
+  # Create a seedfile that's sufficiently long in all library configurations.
+  # This is necessary for programs that use randomness.
+  # Assume that the name of the seedfile is the default name.
+  files_to_clean="$files_to_clean seedfile"
+  dd if=/dev/urandom of=seedfile ibs=64 obs=64 count=1
+fi
diff --git a/programs/psa/key_ladder_demo.sh b/programs/psa/key_ladder_demo.sh
index e21d1ab..bb4a24f 100755
--- a/programs/psa/key_ladder_demo.sh
+++ b/programs/psa/key_ladder_demo.sh
@@ -15,36 +15,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -e -u
+. "${0%/*}/../demo_common.sh"
 
-program_name="key_ladder_demo"
-program="${0%/*}/$program_name"
-files_to_clean=
+msg <<'EOF'
+This script demonstrates the use of the PSA cryptography interface to
+create a master key, derive a key from it and use that derived key to
+wrap some data using an AEAD algorithm.
+EOF
 
-if [ ! -e "$program" ]; then
-    # Look for programs in the current directory and the directories above it
-    for dir in "." ".." "../.."; do
-        program="$dir/programs/psa/$program_name"
-        if [ -e "$program" ]; then
-            break
-        fi
-    done
-    if [ ! -e "$program" ]; then
-        echo "Could not find $program_name executable"
+depends_on MBEDTLS_SHA256_C MBEDTLS_MD_C MBEDTLS_AES_C MBEDTLS_CCM_C MBEDTLS_PSA_CRYPTO_C MBEDTLS_FS_IO
 
-        echo "If building out-of-tree, this script must be run" \
-             "from the project build directory."
-        exit 1
-    fi
-fi
-
-run () {
-    echo
-    echo "# $1"
-    shift
-    echo "+ $*"
-    "$@"
-}
+program="${0%/*}"/key_ladder_demo
 
 if [ -e master.key ]; then
     echo "# Reusing the existing master.key file."
@@ -68,7 +49,7 @@
     cmp input.txt hello_world.txt
 
 files_to_clean="$files_to_clean hellow_orld.txt"
-! run "Derive a different key and attempt to unwrap the data. This must fail." \
+run_bad "Derive a different key and attempt to unwrap the data." \
   "$program" unwrap master=master.key input=hello_world.wrap output=hellow_orld.txt label=hellow label=orld
 
 files_to_clean="$files_to_clean hello.key"
@@ -79,5 +60,4 @@
     "$program" unwrap master=hello.key label=world \
                input=hello_world.wrap output=hello_world.txt
 
-# Cleanup
-rm -f $files_to_clean
+cleanup
diff --git a/programs/test/dlopen_demo.sh b/programs/test/dlopen_demo.sh
index a6a9022..b162d7b 100755
--- a/programs/test/dlopen_demo.sh
+++ b/programs/test/dlopen_demo.sh
@@ -18,34 +18,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -e -u
+. "${0%/*}/../demo_common.sh"
 
-program_name="dlopen"
-program_dir="${0%/*}"
-program="$program_dir/$program_name"
+msg "Test the dynamic loading of libmbed*"
 
+program="$programs_dir/test/dlopen"
+library_dir="$root_dir/library"
+
+# Skip this test if we don't have a shared library build. Detect this
+# through the absence of the demo program.
 if [ ! -e "$program" ]; then
-    # Look for programs in the current directory and the directories above it
-    for dir in "." ".." "../.."; do
-        program_dir="$dir/programs/test"
-        program="$program_dir/$program_name"
-        if [ -e "$program" ]; then
-            break
-        fi
-    done
-    if [ ! -e "$program" ]; then
-        echo "Could not find $program_name program"
-
-        echo "Make sure that Mbed TLS is built as a shared library." \
-             "If building out-of-tree, this script must be run" \
-             "from the project build directory."
-        exit 1
-    fi
+    msg "$0: this demo requires a shared library build."
+    # Exit with a success status so that this counts as a pass for run_demos.py.
+    exit
 fi
 
-top_dir="$program_dir/../.."
-library_dir="$top_dir/library"
-
 # ELF-based Unix-like (Linux, *BSD, Solaris, ...)
 if [ -n "${LD_LIBRARY_PATH-}" ]; then
     LD_LIBRARY_PATH="$library_dir:$LD_LIBRARY_PATH"
@@ -62,6 +49,6 @@
 fi
 export DYLD_LIBRARY_PATH
 
-echo "Running dynamic loading test program: $program"
-echo "Loading libraries from: $library_dir"
+msg "Running dynamic loading test program: $program"
+msg "Loading libraries from: $library_dir"
 "$program"
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index 558d8cc..7e2a6bd 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -261,6 +261,10 @@
 
                 if ((subtype_value = strchr(q, ':')) != NULL) {
                     *subtype_value++ = '\0';
+                } else {
+                    mbedtls_printf(
+                        "Invalid argument for option SAN: Entry must be of the form TYPE:value\n");
+                    goto usage;
                 }
                 if (strcmp(q, "RFC822") == 0) {
                     cur->node.type = MBEDTLS_X509_SAN_RFC822_NAME;
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index 40b1871..d8660dc 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -583,6 +583,10 @@
 
                 if ((subtype_value = strchr(q, ':')) != NULL) {
                     *subtype_value++ = '\0';
+                } else {
+                    mbedtls_printf(
+                        "Invalid argument for option SAN: Entry must be of the form TYPE:value\n");
+                    goto usage;
                 }
                 if (strcmp(q, "RFC822") == 0) {
                     cur->node.type = MBEDTLS_X509_SAN_RFC822_NAME;
diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index 9ba7dbc..959308a 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -28,9 +28,6 @@
 #include <psa/crypto.h>
 #endif
 
-#if defined(MBEDTLS_MD_LIGHT)
-#include "mbedtls/md.h"
-#endif
 
 #if defined(MBEDTLS_PSA_CRYPTO_C)
 /** Initialize the PSA Crypto subsystem. */
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index fdcf7b4..9290aa6 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1063,6 +1063,9 @@
 
     msg "selftest: make, default config (out-of-box)" # ~10s
     programs/test/selftest
+
+    msg "program demos: make, default config (out-of-box)" # ~10s
+    tests/scripts/run_demos.py
 }
 
 component_test_default_cmake_gcc_asan () {
@@ -1073,6 +1076,9 @@
     msg "test: main suites (inc. selftests) (ASan build)" # ~ 50s
     make test
 
+    msg "program demos (ASan build)" # ~10s
+    tests/scripts/run_demos.py
+
     msg "test: selftest (ASan build)" # ~ 10s
     programs/test/selftest
 
@@ -1862,6 +1868,9 @@
     msg "test: cpp_dummy_build (full config, clang)" # ~ 1s
     programs/test/cpp_dummy_build
 
+    msg "program demos (full config, clang)" # ~10s
+    tests/scripts/run_demos.py
+
     msg "test: psa_constant_names (full config, clang)" # ~ 1s
     tests/scripts/test_psa_constant_names.py
 
@@ -2045,6 +2054,9 @@
 
     msg "test: full config + MBEDTLS_TEST_DEPRECATED" # ~ 30s
     make test
+
+    msg "program demos: full config + MBEDTLS_TEST_DEPRECATED" # ~10s
+    tests/scripts/run_demos.py
 }
 
 # Check that the specified libraries exist and are empty.
@@ -5192,6 +5204,9 @@
     msg "test: main suites (MSan)" # ~ 10s
     make test
 
+    msg "program demos (MSan)" # ~20s
+    tests/scripts/run_demos.py
+
     msg "test: ssl-opt.sh (MSan)" # ~ 1 min
     tests/ssl-opt.sh
 
diff --git a/tests/scripts/check_files.py b/tests/scripts/check_files.py
index 352b55e..238a83f 100755
--- a/tests/scripts/check_files.py
+++ b/tests/scripts/check_files.py
@@ -162,24 +162,6 @@
     return ext in ('.bat', '.dsp', '.dsw', '.sln', '.vcxproj')
 
 
-class PermissionIssueTracker(FileIssueTracker):
-    """Track files with bad permissions.
-
-    Files that are not executable scripts must not be executable."""
-
-    heading = "Incorrect permissions:"
-
-    # .py files can be either full scripts or modules, so they may or may
-    # not be executable.
-    suffix_exemptions = frozenset({".py"})
-
-    def check_file_for_issue(self, filepath):
-        is_executable = os.access(filepath, os.X_OK)
-        should_be_executable = filepath.endswith((".sh", ".pl"))
-        if is_executable != should_be_executable:
-            self.files_with_issues[filepath] = None
-
-
 class ShebangIssueTracker(FileIssueTracker):
     """Track files with a bad, missing or extraneous shebang line.
 
@@ -386,7 +368,6 @@
         self.logger = None
         self.setup_logger(log_file)
         self.issues_to_check = [
-            PermissionIssueTracker(),
             ShebangIssueTracker(),
             EndOfFileNewlineIssueTracker(),
             Utf8BomIssueTracker(),
diff --git a/tests/scripts/run_demos.py b/tests/scripts/run_demos.py
new file mode 100755
index 0000000..6a63d23
--- /dev/null
+++ b/tests/scripts/run_demos.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""Run the Mbed TLS demo scripts.
+"""
+import argparse
+import glob
+import subprocess
+import sys
+
+def run_demo(demo, quiet=False):
+    """Run the specified demo script. Return True if it succeeds."""
+    args = {}
+    if quiet:
+        args['stdout'] = subprocess.DEVNULL
+        args['stderr'] = subprocess.DEVNULL
+    returncode = subprocess.call([demo], **args)
+    return returncode == 0
+
+def run_demos(demos, quiet=False):
+    """Run the specified demos and print summary information about failures.
+
+    Return True if all demos passed and False if a demo fails.
+    """
+    failures = []
+    for demo in demos:
+        if not quiet:
+            print('#### {} ####'.format(demo))
+        success = run_demo(demo, quiet=quiet)
+        if not success:
+            failures.append(demo)
+            if not quiet:
+                print('{}: FAIL'.format(demo))
+        if quiet:
+            print('{}: {}'.format(demo, 'PASS' if success else 'FAIL'))
+        else:
+            print('')
+    successes = len(demos) - len(failures)
+    print('{}/{} demos passed'.format(successes, len(demos)))
+    if failures and not quiet:
+        print('Failures:', *failures)
+    return not failures
+
+def run_all_demos(quiet=False):
+    """Run all the available demos.
+
+    Return True if all demos passed and False if a demo fails.
+    """
+    all_demos = glob.glob('programs/*/*_demo.sh')
+    if not all_demos:
+        # Keep the message on one line. pylint: disable=line-too-long
+        raise Exception('No demos found. run_demos needs to operate from the Mbed TLS toplevel directory.')
+    return run_demos(all_demos, quiet=quiet)
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--quiet', '-q',
+                        action='store_true',
+                        help="suppress the output of demos")
+    options = parser.parse_args()
+    success = run_all_demos(quiet=options.quiet)
+    sys.exit(0 if success else 1)
+
+if __name__ == '__main__':
+    main()
diff --git a/tests/src/drivers/test_driver_signature.c b/tests/src/drivers/test_driver_signature.c
index c312477..7d1f91f 100644
--- a/tests/src/drivers/test_driver_signature.c
+++ b/tests/src/drivers/test_driver_signature.c
@@ -33,7 +33,6 @@
 #include "test/drivers/signature.h"
 #include "test/drivers/hash.h"
 
-#include "mbedtls/md.h"
 #include "mbedtls/ecdsa.h"
 
 #include "test/random.h"
diff --git a/tests/suites/test_suite_psa_crypto_persistent_key.function b/tests/suites/test_suite_psa_crypto_persistent_key.function
index a48114f..c4e4c7d 100644
--- a/tests/suites/test_suite_psa_crypto_persistent_key.function
+++ b/tests/suites/test_suite_psa_crypto_persistent_key.function
@@ -17,8 +17,6 @@
 #include "psa_crypto_slot_management.h"
 #include "psa_crypto_storage.h"
 
-#include "mbedtls/md.h"
-
 #define PSA_KEY_STORAGE_MAGIC_HEADER "PSA\0KEY"
 #define PSA_KEY_STORAGE_MAGIC_HEADER_LENGTH (sizeof(PSA_KEY_STORAGE_MAGIC_HEADER))