diff --git a/CMakeLists.txt b/CMakeLists.txt
index 479863e..6d16079 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -281,6 +281,15 @@
     endif(CMAKE_COMPILER_IS_IAR)
 endif(MBEDTLS_FATAL_WARNINGS)
 
+if(CMAKE_BUILD_TYPE STREQUAL "Check" AND TEST_CPP)
+    set(CMAKE_CXX_STANDARD 11)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+    set(CMAKE_CXX_EXTENSIONS OFF)
+    if(CMAKE_COMPILER_IS_CLANG OR CMAKE_COMPILER_IS_GNU)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic")
+    endif()
+endif()
+
 if(CMAKE_BUILD_TYPE STREQUAL "Coverage")
     if(CMAKE_COMPILER_IS_GNU OR CMAKE_COMPILER_IS_CLANG)
         set(CMAKE_SHARED_LINKER_FLAGS "--coverage")
diff --git a/ChangeLog.d/psa_generate_key_custom.txt b/ChangeLog.d/psa_generate_key_custom.txt
new file mode 100644
index 0000000..3fc1bd7
--- /dev/null
+++ b/ChangeLog.d/psa_generate_key_custom.txt
@@ -0,0 +1,9 @@
+API changes
+   * The experimental functions psa_generate_key_ext() and
+     psa_key_derivation_output_key_ext() have been replaced by
+     psa_generate_key_custom() and psa_key_derivation_output_key_custom().
+     They have almost exactly the same interface, but the variable-length
+     data is passed in a separate parameter instead of a flexible array
+     member. This resolves a build failure under C++ compilers that do not
+     support flexible array members (a C99 feature not adopted by C++).
+     Fixes #9020.
diff --git a/docs/psa-transition.md b/docs/psa-transition.md
index bbb7da2..dea14fe 100644
--- a/docs/psa-transition.md
+++ b/docs/psa-transition.md
@@ -779,7 +779,7 @@
 
 The easiest way to create a key pair object is by randomly generating it with [`psa_generate_key`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__random/#group__random_1ga1985eae417dfbccedf50d5fff54ea8c5). Compared with the low-level functions from the legacy API (`mbedtls_rsa_gen_key`, `mbedtls_ecp_gen_privkey`, `mbedtls_ecp_gen_keypair`, `mbedtls_ecp_gen_keypair_base`, `mbedtls_ecdsa_genkey`), this directly creates an object that can be used with high-level APIs, but removes some of the flexibility. Note that if you want to export the generated private key, you must pass the flag [`PSA_KEY_USAGE_EXPORT`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__policy/#group__policy_1ga7dddccdd1303176e87a4d20c87b589ed) to [`psa_set_key_usage_flags`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__attributes/#group__attributes_1ga42a65b3c4522ce9b67ea5ea7720e17de); exporting the public key with [`psa_export_public_key`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__import__export/#group__import__export_1gaf22ae73312217aaede2ea02cdebb6062) is always permitted.
 
-For RSA keys, `psa_generate_key` uses 65537 as the public exponent. You can use [`psa_generate_key_ext`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__random/#group__random_1ga6776360ae8046a4456a5f990f997da58) to select a different public exponent. As of Mbed TLS 3.6.0, selecting a different public exponent is only supported with the built-in RSA implementation, not with PSA drivers.
+For RSA keys, `psa_generate_key` uses 65537 as the public exponent. You can use [`psa_generate_key_custom`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__random/#ga0415617443afe42a712027bbb8ad89f0) to select a different public exponent. As of Mbed TLS 3.6.1, selecting a different public exponent is only supported with the built-in RSA implementation, not with PSA drivers.
 
 To create a key object from existing material, use [`psa_import_key`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__import__export/#group__import__export_1ga0336ea76bf30587ab204a8296462327b). This function has the same basic goal as the PK parse functions (`mbedtls_pk_parse_key`, `mbedtls_pk_parse_public_key`, `mbedtls_pk_parse_subpubkey`), but only supports a single format that just contains the number(s) that make up the key, with very little metadata. The table below summarizes the PSA import/export format for key pairs and public keys; see the documentation of [`psa_export_key`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__import__export/#group__import__export_1ga668e35be8d2852ad3feeef74ac6f75bf) and [`psa_export_public_key`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__import__export/#group__import__export_1gaf22ae73312217aaede2ea02cdebb6062) for more details.
 
diff --git a/scripts/common.make b/scripts/common.make
index d102a97..9c7fd73 100644
--- a/scripts/common.make
+++ b/scripts/common.make
@@ -20,14 +20,14 @@
 
 CFLAGS	?= -O2
 WARNING_CFLAGS ?= -Wall -Wextra -Wformat=2 -Wno-format-nonliteral
-WARNING_CXXFLAGS ?= -Wall -Wextra -Wformat=2 -Wno-format-nonliteral
+WARNING_CXXFLAGS ?= -Wall -Wextra -Wformat=2 -Wno-format-nonliteral -std=c++11 -pedantic
 LDFLAGS ?=
 
 LOCAL_CFLAGS = $(WARNING_CFLAGS) -I$(MBEDTLS_TEST_PATH)/include \
                -I$(MBEDTLS_PATH)/include -I$(MBEDTLS_PATH)/tf-psa-crypto/include \
                -I$(MBEDTLS_PATH)/tf-psa-crypto/drivers/builtin/include \
                -D_FILE_OFFSET_BITS=64
-LOCAL_CXXFLAGS = $(WARNING_CXXFLAGS) -I$(MBEDTLS_PATH)/include -I$(MBEDTLS_PATH)/tests/include -D_FILE_OFFSET_BITS=64
+LOCAL_CXXFLAGS = $(WARNING_CXXFLAGS) $(LOCAL_CFLAGS)
 
 ifdef PSASIM
 LOCAL_LDFLAGS = ${MBEDTLS_TEST_OBJS} 		\
diff --git a/scripts/data_files/driver_templates/psa_crypto_driver_wrappers.h.jinja b/scripts/data_files/driver_templates/psa_crypto_driver_wrappers.h.jinja
index 8b91f0b..d3b7d6f 100644
--- a/scripts/data_files/driver_templates/psa_crypto_driver_wrappers.h.jinja
+++ b/scripts/data_files/driver_templates/psa_crypto_driver_wrappers.h.jinja
@@ -731,7 +731,8 @@
 
 static inline psa_status_t psa_driver_wrapper_generate_key(
     const psa_key_attributes_t *attributes,
-    const psa_key_production_parameters_t *params, size_t params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data, size_t custom_data_length,
     uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length )
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
@@ -740,7 +741,7 @@
 
 #if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE)
     int is_default_production =
-        psa_key_production_parameters_are_default(params, params_data_length);
+        psa_custom_key_parameters_are_default(custom, custom_data_length);
     if( location != PSA_KEY_LOCATION_LOCAL_STORAGE && !is_default_production )
     {
         /* We don't support passing custom production parameters
@@ -811,7 +812,7 @@
 
             /* Software fallback */
             status = psa_generate_key_internal(
-                attributes, params, params_data_length,
+                attributes, custom, custom_data, custom_data_length,
                 key_buffer, key_buffer_size, key_buffer_length );
             break;
 
diff --git a/scripts/lcov.sh b/scripts/lcov.sh
index 9a0c582..2d2f42b 100755
--- a/scripts/lcov.sh
+++ b/scripts/lcov.sh
@@ -30,9 +30,15 @@
 
 set -eu
 
-# Repository detection
-in_mbedtls_build_dir () {
-    test -d library
+# Project detection
+PROJECT_NAME_FILE='./scripts/project_name.txt'
+if read -r PROJECT_NAME < "$PROJECT_NAME_FILE"; then :; else
+    echo "$PROJECT_NAME_FILE does not exist... Exiting..." >&2
+    exit 1
+fi
+
+in_mbedtls_repo () {
+    test "$PROJECT_NAME" = "Mbed TLS"
 }
 
 # Collect stats and build a HTML report.
@@ -68,7 +74,7 @@
     exit
 fi
 
-if in_mbedtls_build_dir; then
+if in_mbedtls_repo; then
     library_dir='library'
     title='Mbed TLS'
 else
diff --git a/scripts/project_name.txt b/scripts/project_name.txt
new file mode 100644
index 0000000..a38cf26
--- /dev/null
+++ b/scripts/project_name.txt
@@ -0,0 +1 @@
+Mbed TLS
diff --git a/tests/include/test/psa_test_wrappers.h b/tests/include/test/psa_test_wrappers.h
index 9551855..b83f405 100644
--- a/tests/include/test/psa_test_wrappers.h
+++ b/tests/include/test/psa_test_wrappers.h
@@ -354,13 +354,14 @@
 #define psa_generate_key(arg0_attributes, arg1_key) \
     mbedtls_test_wrap_psa_generate_key(arg0_attributes, arg1_key)
 
-psa_status_t mbedtls_test_wrap_psa_generate_key_ext(
+psa_status_t mbedtls_test_wrap_psa_generate_key_custom(
     const psa_key_attributes_t *arg0_attributes,
-    const psa_key_production_parameters_t *arg1_params,
-    size_t arg2_params_data_length,
-    mbedtls_svc_key_id_t *arg3_key);
-#define psa_generate_key_ext(arg0_attributes, arg1_params, arg2_params_data_length, arg3_key) \
-    mbedtls_test_wrap_psa_generate_key_ext(arg0_attributes, arg1_params, arg2_params_data_length, arg3_key)
+    const psa_custom_key_parameters_t *arg1_custom,
+    const uint8_t *arg2_custom_data,
+    size_t arg3_custom_data_length,
+    mbedtls_svc_key_id_t *arg4_key);
+#define psa_generate_key_custom(arg0_attributes, arg1_custom, arg2_custom_data, arg3_custom_data_length, arg4_key) \
+    mbedtls_test_wrap_psa_generate_key_custom(arg0_attributes, arg1_custom, arg2_custom_data, arg3_custom_data_length, arg4_key)
 
 psa_status_t mbedtls_test_wrap_psa_generate_random(
     uint8_t *arg0_output,
@@ -496,14 +497,15 @@
 #define psa_key_derivation_output_key(arg0_attributes, arg1_operation, arg2_key) \
     mbedtls_test_wrap_psa_key_derivation_output_key(arg0_attributes, arg1_operation, arg2_key)
 
-psa_status_t mbedtls_test_wrap_psa_key_derivation_output_key_ext(
+psa_status_t mbedtls_test_wrap_psa_key_derivation_output_key_custom(
     const psa_key_attributes_t *arg0_attributes,
     psa_key_derivation_operation_t *arg1_operation,
-    const psa_key_production_parameters_t *arg2_params,
-    size_t arg3_params_data_length,
-    mbedtls_svc_key_id_t *arg4_key);
-#define psa_key_derivation_output_key_ext(arg0_attributes, arg1_operation, arg2_params, arg3_params_data_length, arg4_key) \
-    mbedtls_test_wrap_psa_key_derivation_output_key_ext(arg0_attributes, arg1_operation, arg2_params, arg3_params_data_length, arg4_key)
+    const psa_custom_key_parameters_t *arg2_custom,
+    const uint8_t *arg3_custom_data,
+    size_t arg4_custom_data_length,
+    mbedtls_svc_key_id_t *arg5_key);
+#define psa_key_derivation_output_key_custom(arg0_attributes, arg1_operation, arg2_custom, arg3_custom_data, arg4_custom_data_length, arg5_key) \
+    mbedtls_test_wrap_psa_key_derivation_output_key_custom(arg0_attributes, arg1_operation, arg2_custom, arg3_custom_data, arg4_custom_data_length, arg5_key)
 
 psa_status_t mbedtls_test_wrap_psa_key_derivation_set_capacity(
     psa_key_derivation_operation_t *arg0_operation,
diff --git a/tests/psa-client-server/psasim/src/psa_functions_codes.h b/tests/psa-client-server/psasim/src/psa_functions_codes.h
index bc1b844..1301ff2 100644
--- a/tests/psa-client-server/psasim/src/psa_functions_codes.h
+++ b/tests/psa-client-server/psasim/src/psa_functions_codes.h
@@ -40,7 +40,7 @@
     PSA_EXPORT_KEY,
     PSA_EXPORT_PUBLIC_KEY,
     PSA_GENERATE_KEY,
-    PSA_GENERATE_KEY_EXT,
+    PSA_GENERATE_KEY_CUSTOM,
     PSA_GENERATE_RANDOM,
     PSA_GET_KEY_ATTRIBUTES,
     PSA_HASH_ABORT,
@@ -62,7 +62,7 @@
     PSA_KEY_DERIVATION_KEY_AGREEMENT,
     PSA_KEY_DERIVATION_OUTPUT_BYTES,
     PSA_KEY_DERIVATION_OUTPUT_KEY,
-    PSA_KEY_DERIVATION_OUTPUT_KEY_EXT,
+    PSA_KEY_DERIVATION_OUTPUT_KEY_CUSTOM,
     PSA_KEY_DERIVATION_SET_CAPACITY,
     PSA_KEY_DERIVATION_SETUP,
     PSA_MAC_ABORT,
diff --git a/tests/psa-client-server/psasim/src/psa_sim_crypto_client.c b/tests/psa-client-server/psasim/src/psa_sim_crypto_client.c
index 4200f6c..d4d9d60 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_crypto_client.c
+++ b/tests/psa-client-server/psasim/src/psa_sim_crypto_client.c
@@ -2803,9 +2803,10 @@
 }
 
 
-psa_status_t psa_generate_key_ext(
+psa_status_t psa_generate_key_custom(
     const psa_key_attributes_t *attributes,
-    const psa_key_production_parameters_t *params, size_t  params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data, size_t  custom_data_length,
     mbedtls_svc_key_id_t *key
     )
 {
@@ -2817,7 +2818,8 @@
     size_t needed =
         psasim_serialise_begin_needs() +
         psasim_serialise_psa_key_attributes_t_needs(*attributes) +
-        psasim_serialise_psa_key_production_parameters_t_needs(params, params_data_length) +
+        psasim_serialise_psa_custom_key_parameters_t_needs(*custom) +
+        psasim_serialise_buffer_needs(custom_data, custom_data_length) +
         psasim_serialise_mbedtls_svc_key_id_t_needs(*key);
 
     ser_params = malloc(needed);
@@ -2839,9 +2841,15 @@
     if (!ok) {
         goto fail;
     }
-    ok = psasim_serialise_psa_key_production_parameters_t(
+    ok = psasim_serialise_psa_custom_key_parameters_t(
         &pos, &remaining,
-        params, params_data_length);
+        *custom);
+    if (!ok) {
+        goto fail;
+    }
+    ok = psasim_serialise_buffer(
+        &pos, &remaining,
+        custom_data, custom_data_length);
     if (!ok) {
         goto fail;
     }
@@ -2852,10 +2860,10 @@
         goto fail;
     }
 
-    ok = psa_crypto_call(PSA_GENERATE_KEY_EXT,
+    ok = psa_crypto_call(PSA_GENERATE_KEY_CUSTOM,
                          ser_params, (size_t) (pos - ser_params), &ser_result, &result_length);
     if (!ok) {
-        printf("PSA_GENERATE_KEY_EXT server call failed\n");
+        printf("PSA_GENERATE_KEY_CUSTOM server call failed\n");
         goto fail;
     }
 
@@ -4572,10 +4580,11 @@
 }
 
 
-psa_status_t psa_key_derivation_output_key_ext(
+psa_status_t psa_key_derivation_output_key_custom(
     const psa_key_attributes_t *attributes,
     psa_key_derivation_operation_t *operation,
-    const psa_key_production_parameters_t *params, size_t  params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data, size_t  custom_data_length,
     mbedtls_svc_key_id_t *key
     )
 {
@@ -4588,7 +4597,8 @@
         psasim_serialise_begin_needs() +
         psasim_serialise_psa_key_attributes_t_needs(*attributes) +
         psasim_serialise_psa_key_derivation_operation_t_needs(*operation) +
-        psasim_serialise_psa_key_production_parameters_t_needs(params, params_data_length) +
+        psasim_serialise_psa_custom_key_parameters_t_needs(*custom) +
+        psasim_serialise_buffer_needs(custom_data, custom_data_length) +
         psasim_serialise_mbedtls_svc_key_id_t_needs(*key);
 
     ser_params = malloc(needed);
@@ -4616,9 +4626,15 @@
     if (!ok) {
         goto fail;
     }
-    ok = psasim_serialise_psa_key_production_parameters_t(
+    ok = psasim_serialise_psa_custom_key_parameters_t(
         &pos, &remaining,
-        params, params_data_length);
+        *custom);
+    if (!ok) {
+        goto fail;
+    }
+    ok = psasim_serialise_buffer(
+        &pos, &remaining,
+        custom_data, custom_data_length);
     if (!ok) {
         goto fail;
     }
@@ -4629,10 +4645,10 @@
         goto fail;
     }
 
-    ok = psa_crypto_call(PSA_KEY_DERIVATION_OUTPUT_KEY_EXT,
+    ok = psa_crypto_call(PSA_KEY_DERIVATION_OUTPUT_KEY_CUSTOM,
                          ser_params, (size_t) (pos - ser_params), &ser_result, &result_length);
     if (!ok) {
-        printf("PSA_KEY_DERIVATION_OUTPUT_KEY_EXT server call failed\n");
+        printf("PSA_KEY_DERIVATION_OUTPUT_KEY_CUSTOM server call failed\n");
         goto fail;
     }
 
diff --git a/tests/psa-client-server/psasim/src/psa_sim_crypto_server.c b/tests/psa-client-server/psasim/src/psa_sim_crypto_server.c
index cab32c4..b2ed070 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_crypto_server.c
+++ b/tests/psa-client-server/psasim/src/psa_sim_crypto_server.c
@@ -3116,14 +3116,15 @@
 }
 
 // Returns 1 for success, 0 for failure
-int psa_generate_key_ext_wrapper(
+int psa_generate_key_custom_wrapper(
     uint8_t *in_params, size_t in_params_len,
     uint8_t **out_params, size_t *out_params_len)
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_key_attributes_t attributes;
-    psa_key_production_parameters_t *params = NULL;
-    size_t params_data_length;
+    psa_custom_key_parameters_t custom;
+    uint8_t *custom_data = NULL;
+    size_t custom_data_length;
     mbedtls_svc_key_id_t key;
 
     uint8_t *pos = in_params;
@@ -3143,9 +3144,16 @@
         goto fail;
     }
 
-    ok = psasim_deserialise_psa_key_production_parameters_t(
+    ok = psasim_deserialise_psa_custom_key_parameters_t(
         &pos, &remaining,
-        &params, &params_data_length);
+        &custom);
+    if (!ok) {
+        goto fail;
+    }
+
+    ok = psasim_deserialise_buffer(
+        &pos, &remaining,
+        &custom_data, &custom_data_length);
     if (!ok) {
         goto fail;
     }
@@ -3159,9 +3167,10 @@
 
     // Now we call the actual target function
 
-    status = psa_generate_key_ext(
+    status = psa_generate_key_custom(
         &attributes,
-        params, params_data_length,
+        &custom,
+        custom_data, custom_data_length,
         &key
         );
 
@@ -3201,14 +3210,14 @@
     *out_params = result;
     *out_params_len = result_size;
 
-    free(params);
+    free(custom_data);
 
     return 1;   // success
 
 fail:
     free(result);
 
-    free(params);
+    free(custom_data);
 
     return 0;       // This shouldn't happen!
 }
@@ -5079,15 +5088,16 @@
 }
 
 // Returns 1 for success, 0 for failure
-int psa_key_derivation_output_key_ext_wrapper(
+int psa_key_derivation_output_key_custom_wrapper(
     uint8_t *in_params, size_t in_params_len,
     uint8_t **out_params, size_t *out_params_len)
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_key_attributes_t attributes;
     psa_key_derivation_operation_t *operation;
-    psa_key_production_parameters_t *params = NULL;
-    size_t params_data_length;
+    psa_custom_key_parameters_t custom;
+    uint8_t *custom_data = NULL;
+    size_t custom_data_length;
     mbedtls_svc_key_id_t key;
 
     uint8_t *pos = in_params;
@@ -5114,9 +5124,16 @@
         goto fail;
     }
 
-    ok = psasim_deserialise_psa_key_production_parameters_t(
+    ok = psasim_deserialise_psa_custom_key_parameters_t(
         &pos, &remaining,
-        &params, &params_data_length);
+        &custom);
+    if (!ok) {
+        goto fail;
+    }
+
+    ok = psasim_deserialise_buffer(
+        &pos, &remaining,
+        &custom_data, &custom_data_length);
     if (!ok) {
         goto fail;
     }
@@ -5130,10 +5147,11 @@
 
     // Now we call the actual target function
 
-    status = psa_key_derivation_output_key_ext(
+    status = psa_key_derivation_output_key_custom(
         &attributes,
         operation,
-        params, params_data_length,
+        &custom,
+        custom_data, custom_data_length,
         &key
         );
 
@@ -5181,14 +5199,14 @@
     *out_params = result;
     *out_params_len = result_size;
 
-    free(params);
+    free(custom_data);
 
     return 1;   // success
 
 fail:
     free(result);
 
-    free(params);
+    free(custom_data);
 
     return 0;       // This shouldn't happen!
 }
@@ -7712,9 +7730,9 @@
             ok = psa_generate_key_wrapper(in_params, in_params_len,
                                           &out_params, &out_params_len);
             break;
-        case PSA_GENERATE_KEY_EXT:
-            ok = psa_generate_key_ext_wrapper(in_params, in_params_len,
-                                              &out_params, &out_params_len);
+        case PSA_GENERATE_KEY_CUSTOM:
+            ok = psa_generate_key_custom_wrapper(in_params, in_params_len,
+                                                 &out_params, &out_params_len);
             break;
         case PSA_GENERATE_RANDOM:
             ok = psa_generate_random_wrapper(in_params, in_params_len,
@@ -7800,9 +7818,9 @@
             ok = psa_key_derivation_output_key_wrapper(in_params, in_params_len,
                                                        &out_params, &out_params_len);
             break;
-        case PSA_KEY_DERIVATION_OUTPUT_KEY_EXT:
-            ok = psa_key_derivation_output_key_ext_wrapper(in_params, in_params_len,
-                                                           &out_params, &out_params_len);
+        case PSA_KEY_DERIVATION_OUTPUT_KEY_CUSTOM:
+            ok = psa_key_derivation_output_key_custom_wrapper(in_params, in_params_len,
+                                                              &out_params, &out_params_len);
             break;
         case PSA_KEY_DERIVATION_SET_CAPACITY:
             ok = psa_key_derivation_set_capacity_wrapper(in_params, in_params_len,
diff --git a/tests/psa-client-server/psasim/src/psa_sim_generate.pl b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
index bc63975..e0e9b19 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_generate.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
@@ -566,13 +566,6 @@
     size_t $n2;
 EOF
             push(@buffers, $n1);        # Add to the list to be free()d at end
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh <<EOF;
-    psa_key_production_parameters_t *$n1 = NULL;
-    size_t $n2;
-EOF
-            push(@buffers, $n1);        # Add to the list to be free()d at end
         } else {
             $argname =~ s/^\*//;        # Remove any leading *
             my $pointer = ($argtype =~ /^psa_\w+_operation_t/) ? "*" : "";
@@ -628,17 +621,6 @@
         goto fail;
     }
 EOF
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh <<EOF;
-
-    ok = psasim_deserialise_${argtype}(
-        &pos, &remaining,
-        &$n1, &$n2);
-    if (!ok) {
-        goto fail;
-    }
-EOF
         } else {
             $argname =~ s/^\*//;        # Remove any leading *
             my $server_specific = ($argtype =~ /^psa_\w+_operation_t/) ? "server_" : "";
@@ -741,16 +723,6 @@
         goto fail;
     }
 EOF
-        } elsif ($argtype eq "psa_key_production_parameters_t") {
-            print $fh <<EOF;
-
-    ok = psasim_serialise_psa_key_production_parameters_t(
-        &rpos, &rremain,
-        $argname);
-    if (!ok) {
-        goto fail;
-    }
-EOF
         } else {
             if ($argname =~ /^\*/) {
                 $argname =~ s/^\*//;    # since it's already a pointer
@@ -1033,9 +1005,6 @@
         if ($argtype =~ /^(const )?buffer$/) {
             my ($n1, $n2) = split(/,\s*/, $argname);
             print $fh "        $n1, $n2";
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh "        $n1, $n2";
         } else {
             $argname =~ s/^\*/\&/;      # Replace leading * with &
             if ($is_server && $argtype =~ /^psa_\w+_operation_t/) {
@@ -1071,10 +1040,6 @@
             my $const = length($1) ? "const " : "";
             my ($n1, $n2) = split(/,/, $argname);
             print $fh "    ${const}uint8_t *$n1, size_t $n2";
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my $const = length($1) ? "const " : "";
-            my ($n1, $n2) = split(/,/, $argname);
-            print $fh "    ${const}psa_key_production_parameters_t *$n1, size_t $n2";
         } else {
             print $fh "    $ctypename$argname";
         }
@@ -1184,19 +1149,6 @@
                         $i++;                   # We're using the next param here
                         my $nname = $1;
                         $name .= ", " . $nname;
-                    } elsif ($arg =~ /^((const)\s+)?psa_key_production_parameters_t\s*\*\s*(\w+)$/) {
-                        $type = "psa_key_production_parameters_t";
-                        $is_output = (length($1) == 0) ? 1 : 0;
-                        $type = "const psa_key_production_parameters_t" if !$is_output;
-                        $ctype = "";
-                        $name = $3;
-                        #print("$arg: $name: might be a psa_key_production_parameters_t?\n");
-                        die("$arg: not a psa_key_production_parameters_t 1!\n") if $i == $#args;
-                        my $next = $args[$i + 1];
-                        die("$arg: $func: $name: $next: not a psa_key_production_parameters_t 2!\n") if $next !~ /^size_t\s+(${name}_\w+)$/;
-                        $i++;                   # We're using the next param here
-                        my $nname = $1;
-                        $name .= ", " . $nname;
                     } elsif ($arg =~ /^((const)\s+)?(\w+)\s*\*(\w+)$/) {
                         ($type, $name) = ($3, "*" . $4);
                         $ctype = $1 . $type . " ";
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.c b/tests/psa-client-server/psasim/src/psa_sim_serialise.c
index 92ecdd2..e5c7225 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.c
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.c
@@ -735,96 +735,38 @@
     return 1;
 }
 
-#define SER_TAG_SIZE        4
-
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t data_length)
+size_t psasim_serialise_psa_custom_key_parameters_t_needs(
+    psa_custom_key_parameters_t value)
 {
-    /* We will serialise with 4-byte tag = "PKPP" + 4-byte overall length at the beginning,
-     * followed by size_t data_length, then the actual data from the structure.
-     */
-    return SER_TAG_SIZE + sizeof(uint32_t) + sizeof(data_length) + sizeof(*params) + data_length;
+    return sizeof(value);
 }
 
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length)
+int psasim_serialise_psa_custom_key_parameters_t(uint8_t **pos,
+                                                 size_t *remaining,
+                                                 psa_custom_key_parameters_t value)
 {
-    if (data_length > UINT32_MAX / 2) {       /* arbitrary limit */
-        return 0;       /* too big to serialise */
-    }
-
-    /* We use 32-bit lengths, which should be enough for any reasonable usage :) */
-    /* (the UINT32_MAX / 2 above is an even more conservative check to avoid overflow here) */
-    uint32_t len = (uint32_t) (sizeof(data_length) + sizeof(*params) + data_length);
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t) + len) {
+    if (*remaining < sizeof(value)) {
         return 0;
     }
 
-    char tag[SER_TAG_SIZE] = "PKPP";
-
-    memcpy(*pos, tag, sizeof(tag));
-    memcpy(*pos + sizeof(tag), &len, sizeof(len));
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    memcpy(*pos, &data_length, sizeof(data_length));
-    memcpy(*pos + sizeof(data_length), params, sizeof(*params) + data_length);
-    *pos += sizeof(data_length) + sizeof(*params) + data_length;
-    *remaining -= sizeof(data_length) + sizeof(*params) + data_length;
+    memcpy(*pos, &value, sizeof(value));
+    *pos += sizeof(value);
 
     return 1;
 }
 
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                       size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *data_length)
+int psasim_deserialise_psa_custom_key_parameters_t(uint8_t **pos,
+                                                   size_t *remaining,
+                                                   psa_custom_key_parameters_t *value)
 {
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t)) {
-        return 0;       /* can't even be an empty serialisation */
+    if (*remaining < sizeof(*value)) {
+        return 0;
     }
 
-    char tag[SER_TAG_SIZE] = "PKPP";    /* expected */
-    uint32_t len;
+    memcpy(value, *pos, sizeof(*value));
 
-    memcpy(&len, *pos + sizeof(tag), sizeof(len));
-
-    if (memcmp(*pos, tag, sizeof(tag)) != 0) {
-        return 0;       /* wrong tag */
-    }
-
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    if (*remaining < sizeof(*data_length)) {
-        return 0;       /* missing data_length */
-    }
-    memcpy(data_length, *pos, sizeof(*data_length));
-
-    if ((size_t) len != (sizeof(data_length) + sizeof(**params) + *data_length)) {
-        return 0;       /* wrong length */
-    }
-
-    if (*remaining < sizeof(*data_length) + sizeof(**params) + *data_length) {
-        return 0;       /* not enough data provided */
-    }
-
-    *pos += sizeof(data_length);
-    *remaining -= sizeof(data_length);
-
-    psa_key_production_parameters_t *out = malloc(sizeof(**params) + *data_length);
-    if (out == NULL) {
-        return 0;       /* allocation failure */
-    }
-
-    memcpy(out, *pos, sizeof(*out) + *data_length);
-    *pos += sizeof(*out) + *data_length;
-    *remaining -= sizeof(*out) + *data_length;
-
-    *params = out;
+    *pos += sizeof(*value);
+    *remaining -= sizeof(*value);
 
     return 1;
 }
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.h b/tests/psa-client-server/psasim/src/psa_sim_serialise.h
index f60e371..523ce80 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.h
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.h
@@ -421,55 +421,48 @@
 int psasim_deserialise_return_buffer(uint8_t **pos, size_t *remaining,
                                      uint8_t *buffer, size_t buffer_length);
 
-/** Return how much space is needed by \c psasim_serialise_psa_key_production_parameters_t()
- *  to serialise a psa_key_production_parameters_t (a structure with a flexible array member).
+/** Return how much buffer space is needed by \c psasim_serialise_psa_custom_key_parameters_t()
+ *  to serialise a `psa_custom_key_parameters_t`.
  *
- * \param params             Pointer to the struct to be serialised
+ * \param value              The value that will be serialised into the buffer
  *                           (needed in case some serialisations are value-
  *                           dependent).
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
  *
- * \return                   The number of bytes needed in the serialisation buffer by
- *                           \c psasim_serialise_psa_key_production_parameters_t() to serialise
- *                           the specified structure.
+ * \return                   The number of bytes needed in the buffer by
+ *                           \c psasim_serialise_psa_custom_key_parameters_t() to serialise
+ *                           the given value.
  */
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t buffer_size);
+size_t psasim_serialise_psa_custom_key_parameters_t_needs(
+    psa_custom_key_parameters_t value);
 
-/** Serialise a psa_key_production_parameters_t.
+/** Serialise a `psa_custom_key_parameters_t` into a buffer.
  *
  * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
  *                           in the buffer.
  * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
  *                           remaining in the buffer.
- * \param params             Pointer to the structure to be serialised.
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
+ * \param value              The value to serialise into the buffer.
  *
  * \return                   \c 1 on success ("okay"), \c 0 on error.
  */
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length);
+int psasim_serialise_psa_custom_key_parameters_t(uint8_t **pos,
+                                                 size_t *remaining,
+                                                 psa_custom_key_parameters_t value);
 
-/** Deserialise a psa_key_production_parameters_t.
+/** Deserialise a `psa_custom_key_parameters_t` from a buffer.
  *
  * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
- *                           in the serialisation buffer.
+ *                           in the buffer.
  * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
- *                           remaining in the serialisation buffer.
- * \param params             Pointer to a `psa_key_production_parameters_t *` to
- *                           receive the address of a newly-allocated structure,
- *                           which the caller must `free()`.
- * \param data_length        Pointer to a `size_t` to receive the number of
- *                           bytes in the data[] member of the structure deserialised.
+ *                           remaining in the buffer.
+ * \param value              Pointer to a `psa_custom_key_parameters_t` to receive the value
+ *                           deserialised from the buffer.
  *
  * \return                   \c 1 on success ("okay"), \c 0 on error.
  */
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos, size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *buffer_length);
+int psasim_deserialise_psa_custom_key_parameters_t(uint8_t **pos,
+                                                   size_t *remaining,
+                                                   psa_custom_key_parameters_t *value);
 
 /** Return how much buffer space is needed by \c psasim_serialise_psa_status_t()
  *  to serialise a `psa_status_t`.
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
index 75e6cd0..31c93ae 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
@@ -38,7 +38,7 @@
 my @types = qw(unsigned-int int size_t
                uint16_t uint32_t uint64_t
                buffer
-               psa_key_production_parameters_t
+               psa_custom_key_parameters_t
                psa_status_t psa_algorithm_t psa_key_derivation_step_t
                psa_hash_operation_t
                psa_aead_operation_t
@@ -66,8 +66,6 @@
     for my $type (@types) {
         if ($type eq "buffer") {
             print declare_buffer_functions();
-        } elsif ($type eq "psa_key_production_parameters_t") {
-            print declare_psa_key_production_parameters_t_functions();
         } else {
             print declare_needs($type, "");
             print declare_serialise($type, "");
@@ -98,8 +96,6 @@
     for my $type (@types) {
         if ($type eq "buffer") {
             print define_buffer_functions();
-        } elsif ($type eq "psa_key_production_parameters_t") {
-            print define_psa_key_production_parameters_t_functions();
         } elsif (exists($isa{$type})) {
             print define_needs_isa($type, $isa{$type});
             print define_serialise_isa($type, $isa{$type});
@@ -304,62 +300,6 @@
 EOF
 }
 
-sub declare_psa_key_production_parameters_t_functions
-{
-    return <<'EOF';
-
-/** Return how much space is needed by \c psasim_serialise_psa_key_production_parameters_t()
- *  to serialise a psa_key_production_parameters_t (a structure with a flexible array member).
- *
- * \param params             Pointer to the struct to be serialised
- *                           (needed in case some serialisations are value-
- *                           dependent).
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
- *
- * \return                   The number of bytes needed in the serialisation buffer by
- *                           \c psasim_serialise_psa_key_production_parameters_t() to serialise
- *                           the specified structure.
- */
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t buffer_size);
-
-/** Serialise a psa_key_production_parameters_t.
- *
- * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
- *                           in the buffer.
- * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
- *                           remaining in the buffer.
- * \param params             Pointer to the structure to be serialised.
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
- *
- * \return                   \c 1 on success ("okay"), \c 0 on error.
- */
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length);
-
-/** Deserialise a psa_key_production_parameters_t.
- *
- * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
- *                           in the serialisation buffer.
- * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
- *                           remaining in the serialisation buffer.
- * \param params             Pointer to a `psa_key_production_parameters_t *` to
- *                           receive the address of a newly-allocated structure,
- *                           which the caller must `free()`.
- * \param data_length        Pointer to a `size_t` to receive the number of
- *                           bytes in the data[] member of the structure deserialised.
- *
- * \return                   \c 1 on success ("okay"), \c 0 on error.
- */
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos, size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *buffer_length);
-EOF
-}
-
 sub h_header
 {
     return <<'EOF';
@@ -816,105 +756,6 @@
 EOF
 }
 
-sub define_psa_key_production_parameters_t_functions
-{
-    return <<'EOF';
-
-#define SER_TAG_SIZE        4
-
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t data_length)
-{
-    /* We will serialise with 4-byte tag = "PKPP" + 4-byte overall length at the beginning,
-     * followed by size_t data_length, then the actual data from the structure.
-     */
-    return SER_TAG_SIZE + sizeof(uint32_t) + sizeof(data_length) + sizeof(*params) + data_length;
-}
-
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length)
-{
-    if (data_length > UINT32_MAX / 2) {       /* arbitrary limit */
-        return 0;       /* too big to serialise */
-    }
-
-    /* We use 32-bit lengths, which should be enough for any reasonable usage :) */
-    /* (the UINT32_MAX / 2 above is an even more conservative check to avoid overflow here) */
-    uint32_t len = (uint32_t) (sizeof(data_length) + sizeof(*params) + data_length);
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t) + len) {
-        return 0;
-    }
-
-    char tag[SER_TAG_SIZE] = "PKPP";
-
-    memcpy(*pos, tag, sizeof(tag));
-    memcpy(*pos + sizeof(tag), &len, sizeof(len));
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    memcpy(*pos, &data_length, sizeof(data_length));
-    memcpy(*pos + sizeof(data_length), params, sizeof(*params) + data_length);
-    *pos += sizeof(data_length) + sizeof(*params) + data_length;
-    *remaining -= sizeof(data_length) + sizeof(*params) + data_length;
-
-    return 1;
-}
-
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                       size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *data_length)
-{
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t)) {
-        return 0;       /* can't even be an empty serialisation */
-    }
-
-    char tag[SER_TAG_SIZE] = "PKPP";    /* expected */
-    uint32_t len;
-
-    memcpy(&len, *pos + sizeof(tag), sizeof(len));
-
-    if (memcmp(*pos, tag, sizeof(tag)) != 0) {
-        return 0;       /* wrong tag */
-    }
-
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    if (*remaining < sizeof(*data_length)) {
-        return 0;       /* missing data_length */
-    }
-    memcpy(data_length, *pos, sizeof(*data_length));
-
-    if ((size_t) len != (sizeof(data_length) + sizeof(**params) + *data_length)) {
-        return 0;       /* wrong length */
-    }
-
-    if (*remaining < sizeof(*data_length) + sizeof(**params) + *data_length) {
-        return 0;       /* not enough data provided */
-    }
-
-    *pos += sizeof(data_length);
-    *remaining -= sizeof(data_length);
-
-    psa_key_production_parameters_t *out = malloc(sizeof(**params) + *data_length);
-    if (out == NULL) {
-        return 0;       /* allocation failure */
-    }
-
-    memcpy(out, *pos, sizeof(*out) + *data_length);
-    *pos += sizeof(*out) + *data_length;
-    *remaining -= sizeof(*out) + *data_length;
-
-    *params = out;
-
-    return 1;
-}
-EOF
-}
 
 sub c_header
 {
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index f216f16..0e9e03e 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -115,15 +115,23 @@
 # Enable ksh/bash extended file matching patterns
 shopt -s extglob
 
+# For project detection
 in_mbedtls_repo () {
-    test -d include -a -d library -a -d programs -a -d tests
+    test "$PROJECT_NAME" = "Mbed TLS"
 }
 
 in_tf_psa_crypto_repo () {
-    test -d include -a -d core -a -d drivers -a -d programs -a -d tests
+    test "$PROJECT_NAME" = "TF-PSA-Crypto"
 }
 
 pre_check_environment () {
+    # For project detection
+    PROJECT_NAME_FILE='./scripts/project_name.txt'
+    if read -r PROJECT_NAME < "$PROJECT_NAME_FILE"; then :; else
+        echo "$PROJECT_NAME_FILE does not exist... Exiting..." >&2
+        exit 1
+    fi
+
     if in_mbedtls_repo || in_tf_psa_crypto_repo; then :; else
         echo "Must be run from Mbed TLS / TF-PSA-Crypto root" >&2
         exit 1
diff --git a/tests/scripts/analyze_outcomes.py b/tests/scripts/analyze_outcomes.py
index 993e23c..082ed01 100755
--- a/tests/scripts/analyze_outcomes.py
+++ b/tests/scripts/analyze_outcomes.py
@@ -642,8 +642,9 @@
                     re.compile(r'mbedtls_ct_memmove_left .*')
                 ],
                 'test_suite_psa_crypto': [
-                    # We don't support generate_key_ext entry points
+                    # We don't support generate_key_custom entry points
                     # in drivers yet.
+                    re.compile(r'PSA generate key custom: RSA, e=.*'),
                     re.compile(r'PSA generate key ext: RSA, e=.*'),
                 ],
             }
diff --git a/tests/scripts/components-build-system.sh b/tests/scripts/components-build-system.sh
index d1440c3..4bb41ae 100644
--- a/tests/scripts/components-build-system.sh
+++ b/tests/scripts/components-build-system.sh
@@ -11,7 +11,7 @@
 
 component_test_make_shared () {
     msg "build/test: make shared" # ~ 40s
-    make SHARED=1 all check
+    make SHARED=1 TEST_CPP=1 all check
     ldd programs/util/strerror | grep libmbedcrypto
     programs/test/dlopen_demo.sh
 }
@@ -65,7 +65,7 @@
     mkdir "$OUT_OF_SOURCE_DIR"
     cd "$OUT_OF_SOURCE_DIR"
     # Note: Explicitly generate files as these are turned off in releases
-    cmake -D CMAKE_BUILD_TYPE:String=Check -D GEN_FILES=ON "$MBEDTLS_ROOT_DIR"
+    cmake -D CMAKE_BUILD_TYPE:String=Check -D GEN_FILES=ON _D TEST_CPP=1 "$MBEDTLS_ROOT_DIR"
     make
 
     msg "test: cmake 'out-of-source' build"
diff --git a/tests/src/psa_test_wrappers.c b/tests/src/psa_test_wrappers.c
index 7415e29..deac300 100644
--- a/tests/src/psa_test_wrappers.c
+++ b/tests/src/psa_test_wrappers.c
@@ -604,14 +604,21 @@
     return status;
 }
 
-/* Wrapper for psa_generate_key_ext */
-psa_status_t mbedtls_test_wrap_psa_generate_key_ext(
+/* Wrapper for psa_generate_key_custom */
+psa_status_t mbedtls_test_wrap_psa_generate_key_custom(
     const psa_key_attributes_t *arg0_attributes,
-    const psa_key_production_parameters_t *arg1_params,
-    size_t arg2_params_data_length,
-    mbedtls_svc_key_id_t *arg3_key)
+    const psa_custom_key_parameters_t *arg1_custom,
+    const uint8_t *arg2_custom_data,
+    size_t arg3_custom_data_length,
+    mbedtls_svc_key_id_t *arg4_key)
 {
-    psa_status_t status = (psa_generate_key_ext)(arg0_attributes, arg1_params, arg2_params_data_length, arg3_key);
+#if !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS)
+    MBEDTLS_TEST_MEMORY_POISON(arg2_custom_data, arg3_custom_data_length);
+#endif /* !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS) */
+    psa_status_t status = (psa_generate_key_custom)(arg0_attributes, arg1_custom, arg2_custom_data, arg3_custom_data_length, arg4_key);
+#if !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS)
+    MBEDTLS_TEST_MEMORY_UNPOISON(arg2_custom_data, arg3_custom_data_length);
+#endif /* !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS) */
     return status;
 }
 
@@ -870,15 +877,22 @@
     return status;
 }
 
-/* Wrapper for psa_key_derivation_output_key_ext */
-psa_status_t mbedtls_test_wrap_psa_key_derivation_output_key_ext(
+/* Wrapper for psa_key_derivation_output_key_custom */
+psa_status_t mbedtls_test_wrap_psa_key_derivation_output_key_custom(
     const psa_key_attributes_t *arg0_attributes,
     psa_key_derivation_operation_t *arg1_operation,
-    const psa_key_production_parameters_t *arg2_params,
-    size_t arg3_params_data_length,
-    mbedtls_svc_key_id_t *arg4_key)
+    const psa_custom_key_parameters_t *arg2_custom,
+    const uint8_t *arg3_custom_data,
+    size_t arg4_custom_data_length,
+    mbedtls_svc_key_id_t *arg5_key)
 {
-    psa_status_t status = (psa_key_derivation_output_key_ext)(arg0_attributes, arg1_operation, arg2_params, arg3_params_data_length, arg4_key);
+#if !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS)
+    MBEDTLS_TEST_MEMORY_POISON(arg3_custom_data, arg4_custom_data_length);
+#endif /* !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS) */
+    psa_status_t status = (psa_key_derivation_output_key_custom)(arg0_attributes, arg1_operation, arg2_custom, arg3_custom_data, arg4_custom_data_length, arg5_key);
+#if !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS)
+    MBEDTLS_TEST_MEMORY_UNPOISON(arg3_custom_data, arg4_custom_data_length);
+#endif /* !defined(MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS) */
     return status;
 }
 
diff --git a/tf-psa-crypto/core/psa_crypto.c b/tf-psa-crypto/core/psa_crypto.c
index 8100afc..0ad4196 100644
--- a/tf-psa-crypto/core/psa_crypto.c
+++ b/tf-psa-crypto/core/psa_crypto.c
@@ -6412,27 +6412,28 @@
     return status;
 }
 
-static const psa_key_production_parameters_t default_production_parameters =
-    PSA_KEY_PRODUCTION_PARAMETERS_INIT;
+static const psa_custom_key_parameters_t default_custom_production =
+    PSA_CUSTOM_KEY_PARAMETERS_INIT;
 
-int psa_key_production_parameters_are_default(
-    const psa_key_production_parameters_t *params,
-    size_t params_data_length)
+int psa_custom_key_parameters_are_default(
+    const psa_custom_key_parameters_t *custom,
+    size_t custom_data_length)
 {
-    if (params->flags != 0) {
+    if (custom->flags != 0) {
         return 0;
     }
-    if (params_data_length != 0) {
+    if (custom_data_length != 0) {
         return 0;
     }
     return 1;
 }
 
-psa_status_t psa_key_derivation_output_key_ext(
+psa_status_t psa_key_derivation_output_key_custom(
     const psa_key_attributes_t *attributes,
     psa_key_derivation_operation_t *operation,
-    const psa_key_production_parameters_t *params,
-    size_t params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data,
+    size_t custom_data_length,
     mbedtls_svc_key_id_t *key)
 {
     psa_status_t status;
@@ -6447,7 +6448,8 @@
         return PSA_ERROR_INVALID_ARGUMENT;
     }
 
-    if (!psa_key_production_parameters_are_default(params, params_data_length)) {
+    (void) custom_data;         /* We only accept 0-length data */
+    if (!psa_custom_key_parameters_are_default(custom, custom_data_length)) {
         return PSA_ERROR_INVALID_ARGUMENT;
     }
 
@@ -6487,9 +6489,10 @@
     psa_key_derivation_operation_t *operation,
     mbedtls_svc_key_id_t *key)
 {
-    return psa_key_derivation_output_key_ext(attributes, operation,
-                                             &default_production_parameters, 0,
-                                             key);
+    return psa_key_derivation_output_key_custom(attributes, operation,
+                                                &default_custom_production,
+                                                NULL, 0,
+                                                key);
 }
 
 
@@ -7863,15 +7866,18 @@
 
 psa_status_t psa_generate_key_internal(
     const psa_key_attributes_t *attributes,
-    const psa_key_production_parameters_t *params, size_t params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data,
+    size_t custom_data_length,
     uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length)
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_key_type_t type = attributes->type;
 
     /* Only used for RSA */
-    (void) params;
-    (void) params_data_length;
+    (void) custom;
+    (void) custom_data;
+    (void) custom_data_length;
 
     if (key_type_is_raw_bytes(type)) {
         status = psa_generate_random_internal(key_buffer, key_buffer_size);
@@ -7889,7 +7895,7 @@
 #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE)
     if (type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
         return mbedtls_psa_rsa_generate_key(attributes,
-                                            params, params_data_length,
+                                            custom_data, custom_data_length,
                                             key_buffer,
                                             key_buffer_size,
                                             key_buffer_length);
@@ -7921,10 +7927,11 @@
     return PSA_SUCCESS;
 }
 
-psa_status_t psa_generate_key_ext(const psa_key_attributes_t *attributes,
-                                  const psa_key_production_parameters_t *params,
-                                  size_t params_data_length,
-                                  mbedtls_svc_key_id_t *key)
+psa_status_t psa_generate_key_custom(const psa_key_attributes_t *attributes,
+                                     const psa_custom_key_parameters_t *custom,
+                                     const uint8_t *custom_data,
+                                     size_t custom_data_length,
+                                     mbedtls_svc_key_id_t *key)
 {
     psa_status_t status;
     psa_key_slot_t *slot = NULL;
@@ -7946,12 +7953,12 @@
 
 #if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE)
     if (attributes->type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
-        if (params->flags != 0) {
+        if (custom->flags != 0) {
             return PSA_ERROR_INVALID_ARGUMENT;
         }
     } else
 #endif
-    if (!psa_key_production_parameters_are_default(params, params_data_length)) {
+    if (!psa_custom_key_parameters_are_default(custom, custom_data_length)) {
         return PSA_ERROR_INVALID_ARGUMENT;
     }
 
@@ -7992,7 +7999,8 @@
     }
 
     status = psa_driver_wrapper_generate_key(attributes,
-                                             params, params_data_length,
+                                             custom,
+                                             custom_data, custom_data_length,
                                              slot->key.data, slot->key.bytes,
                                              &slot->key.bytes);
     if (status != PSA_SUCCESS) {
@@ -8013,9 +8021,10 @@
 psa_status_t psa_generate_key(const psa_key_attributes_t *attributes,
                               mbedtls_svc_key_id_t *key)
 {
-    return psa_generate_key_ext(attributes,
-                                &default_production_parameters, 0,
-                                key);
+    return psa_generate_key_custom(attributes,
+                                   &default_custom_production,
+                                   NULL, 0,
+                                   key);
 }
 
 /****************************************************************/
diff --git a/tf-psa-crypto/core/psa_crypto_core.h b/tf-psa-crypto/core/psa_crypto_core.h
index 9462d2e..e7ff151 100644
--- a/tf-psa-crypto/core/psa_crypto_core.h
+++ b/tf-psa-crypto/core/psa_crypto_core.h
@@ -343,17 +343,18 @@
     const uint8_t *key_buffer, size_t key_buffer_size,
     uint8_t *data, size_t data_size, size_t *data_length);
 
-/** Whether a key production parameters structure is the default.
+/** Whether a key custom production parameters structure is the default.
  *
- * Calls to a key generation driver with non-default production parameters
+ * Calls to a key generation driver with non-default custom production parameters
  * require a driver supporting custom production parameters.
  *
- * \param[in] params            The key production parameters to check.
- * \param params_data_length    Size of `params->data` in bytes.
+ * \param[in] custom            The key custom production parameters to check.
+ * \param custom_data_length    Size of the associated variable-length data
+ *                              in bytes.
  */
-int psa_key_production_parameters_are_default(
-    const psa_key_production_parameters_t *params,
-    size_t params_data_length);
+int psa_custom_key_parameters_are_default(
+    const psa_custom_key_parameters_t *custom,
+    size_t custom_data_length);
 
 /**
  * \brief Generate a key.
@@ -362,9 +363,9 @@
  *       entry point.
  *
  * \param[in]  attributes         The attributes for the key to generate.
- * \param[in]  params             The production parameters from
- *                                psa_generate_key_ext().
- * \param      params_data_length The size of `params->data` in bytes.
+ * \param[in] custom              Custom parameters for the key generation.
+ * \param[in] custom_data         Variable-length data associated with \c custom.
+ * \param custom_data_length      Length of `custom_data` in bytes.
  * \param[out] key_buffer         Buffer where the key data is to be written.
  * \param[in]  key_buffer_size    Size of \p key_buffer in bytes.
  * \param[out] key_buffer_length  On success, the number of bytes written in
@@ -379,8 +380,9 @@
  *         The size of \p key_buffer is too small.
  */
 psa_status_t psa_generate_key_internal(const psa_key_attributes_t *attributes,
-                                       const psa_key_production_parameters_t *params,
-                                       size_t params_data_length,
+                                       const psa_custom_key_parameters_t *custom,
+                                       const uint8_t *custom_data,
+                                       size_t custom_data_length,
                                        uint8_t *key_buffer,
                                        size_t key_buffer_size,
                                        size_t *key_buffer_length);
diff --git a/tf-psa-crypto/core/psa_crypto_rsa.c b/tf-psa-crypto/core/psa_crypto_rsa.c
index 2f613b3..f8e36d8 100644
--- a/tf-psa-crypto/core/psa_crypto_rsa.c
+++ b/tf-psa-crypto/core/psa_crypto_rsa.c
@@ -241,7 +241,7 @@
 
 psa_status_t mbedtls_psa_rsa_generate_key(
     const psa_key_attributes_t *attributes,
-    const psa_key_production_parameters_t *params, size_t params_data_length,
+    const uint8_t *custom_data, size_t custom_data_length,
     uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length)
 {
     psa_status_t status;
@@ -249,8 +249,8 @@
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     int exponent = 65537;
 
-    if (params_data_length != 0) {
-        status = psa_rsa_read_exponent(params->data, params_data_length,
+    if (custom_data_length != 0) {
+        status = psa_rsa_read_exponent(custom_data, custom_data_length,
                                        &exponent);
         if (status != PSA_SUCCESS) {
             return status;
diff --git a/tf-psa-crypto/core/psa_crypto_rsa.h b/tf-psa-crypto/core/psa_crypto_rsa.h
index ffeef26..1a78000 100644
--- a/tf-psa-crypto/core/psa_crypto_rsa.h
+++ b/tf-psa-crypto/core/psa_crypto_rsa.h
@@ -105,17 +105,11 @@
 /**
  * \brief Generate an RSA key.
  *
- * \note The signature of the function is that of a PSA driver generate_key
- *       entry point.
- *
  * \param[in]  attributes         The attributes for the RSA key to generate.
- * \param[in]  params             Production parameters for the key
- *                                generation. This function only uses
- *                                `params->data`,
- *                                which contains the public exponent.
+ * \param[in]  custom_data        The public exponent to use.
  *                                This can be a null pointer if
  *                                \c params_data_length is 0.
- * \param params_data_length      Length of `params->data` in bytes.
+ * \param custom_data_length      Length of \p custom_data in bytes.
  *                                This can be 0, in which case the
  *                                public exponent will be 65537.
  * \param[out] key_buffer         Buffer where the key data is to be written.
@@ -132,7 +126,7 @@
  */
 psa_status_t mbedtls_psa_rsa_generate_key(
     const psa_key_attributes_t *attributes,
-    const psa_key_production_parameters_t *params, size_t params_data_length,
+    const uint8_t *custom_data, size_t custom_data_length,
     uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length);
 
 /** Sign an already-calculated hash with an RSA private key.
diff --git a/tf-psa-crypto/include/psa/crypto.h b/tf-psa-crypto/include/psa/crypto.h
index 3525da2..917e533 100644
--- a/tf-psa-crypto/include/psa/crypto.h
+++ b/tf-psa-crypto/include/psa/crypto.h
@@ -119,8 +119,8 @@
  * value in the structure.
  * The persistent key will be written to storage when the attribute
  * structure is passed to a key creation function such as
- * psa_import_key(), psa_generate_key(), psa_generate_key_ext(),
- * psa_key_derivation_output_key(), psa_key_derivation_output_key_ext()
+ * psa_import_key(), psa_generate_key(), psa_generate_key_custom(),
+ * psa_key_derivation_output_key(), psa_key_derivation_output_key_custom()
  * or psa_copy_key().
  *
  * This function may be declared as `static` (i.e. without external
@@ -164,8 +164,8 @@
  * value in the structure.
  * The persistent key will be written to storage when the attribute
  * structure is passed to a key creation function such as
- * psa_import_key(), psa_generate_key(), psa_generate_key_ext(),
- * psa_key_derivation_output_key(), psa_key_derivation_output_key_ext()
+ * psa_import_key(), psa_generate_key(), psa_generate_key_custom(),
+ * psa_key_derivation_output_key(), psa_key_derivation_output_key_custom()
  * or psa_copy_key().
  *
  * This function may be declared as `static` (i.e. without external
@@ -3234,7 +3234,7 @@
  *    of or after providing inputs. For some algorithms, this step is mandatory
  *    because the output depends on the maximum capacity.
  * -# To derive a key, call psa_key_derivation_output_key() or
- *    psa_key_derivation_output_key_ext().
+ *    psa_key_derivation_output_key_custom().
  *    To derive a byte string for a different purpose, call
  *    psa_key_derivation_output_bytes().
  *    Successive calls to these functions use successive output bytes
@@ -3457,7 +3457,7 @@
  * \note Once all inputs steps are completed, the operations will allow:
  * - psa_key_derivation_output_bytes() if each input was either a direct input
  *   or  a key with #PSA_KEY_USAGE_DERIVE set;
- * - psa_key_derivation_output_key() or psa_key_derivation_output_key_ext()
+ * - psa_key_derivation_output_key() or psa_key_derivation_output_key_custom()
  *   if the input for step
  *   #PSA_KEY_DERIVATION_INPUT_SECRET or #PSA_KEY_DERIVATION_INPUT_PASSWORD
  *   was from a key slot with #PSA_KEY_USAGE_DERIVE and each other input was
@@ -3707,9 +3707,9 @@
  * on the derived key based on the attributes and strength of the secret key.
  *
  * \note This function is equivalent to calling
- *       psa_key_derivation_output_key_ext()
- *       with the production parameters #PSA_KEY_PRODUCTION_PARAMETERS_INIT
- *       and `params_data_length == 0` (i.e. `params->data` is empty).
+ *       psa_key_derivation_output_key_custom()
+ *       with the custom production parameters #PSA_CUSTOM_KEY_PARAMETERS_INIT
+ *       and `custom_data_length == 0` (i.e. `custom_data` is empty).
  *
  * \param[in] attributes    The attributes for the new key.
  *                          If the key type to be created is
@@ -3781,17 +3781,14 @@
  *                          the policy must be the same as in the current
  *                          operation.
  * \param[in,out] operation The key derivation operation object to read from.
- * \param[in] params        Customization parameters for the key derivation.
- *                          When this is #PSA_KEY_PRODUCTION_PARAMETERS_INIT
- *                          with \p params_data_length = 0,
+ * \param[in] custom        Customization parameters for the key generation.
+ *                          When this is #PSA_CUSTOM_KEY_PARAMETERS_INIT
+ *                          with \p custom_data_length = 0,
  *                          this function is equivalent to
  *                          psa_key_derivation_output_key().
- *                          Mbed TLS currently only supports the default
- *                          production parameters, i.e.
- *                          #PSA_KEY_PRODUCTION_PARAMETERS_INIT,
- *                          for all key types.
- * \param params_data_length
- *                          Length of `params->data` in bytes.
+ * \param[in] custom_data   Variable-length data associated with \c custom.
+ * \param custom_data_length
+ *                          Length of `custom_data` in bytes.
  * \param[out] key          On success, an identifier for the newly created
  *                          key. For persistent keys, this is the key
  *                          identifier defined in \p attributes.
@@ -3834,11 +3831,12 @@
  *         It is implementation-dependent whether a failure to initialize
  *         results in this error code.
  */
-psa_status_t psa_key_derivation_output_key_ext(
+psa_status_t psa_key_derivation_output_key_custom(
     const psa_key_attributes_t *attributes,
     psa_key_derivation_operation_t *operation,
-    const psa_key_production_parameters_t *params,
-    size_t params_data_length,
+    const psa_custom_key_parameters_t *custom,
+    const uint8_t *custom_data,
+    size_t custom_data_length,
     mbedtls_svc_key_id_t *key);
 
 /** Compare output data from a key derivation operation to an expected value.
@@ -3927,7 +3925,7 @@
  *                          operation. The value of this key was likely
  *                          computed by a previous call to
  *                          psa_key_derivation_output_key() or
- *                          psa_key_derivation_output_key_ext().
+ *                          psa_key_derivation_output_key_custom().
  *
  * \retval #PSA_SUCCESS \emptydescription
  * \retval #PSA_ERROR_INVALID_SIGNATURE
@@ -4095,9 +4093,9 @@
  *   between 2^{n-1} and 2^n where n is the bit size specified in the
  *   attributes.
  *
- * \note This function is equivalent to calling psa_generate_key_ext()
- *       with the production parameters #PSA_KEY_PRODUCTION_PARAMETERS_INIT
- *       and `params_data_length == 0` (i.e. `params->data` is empty).
+ * \note This function is equivalent to calling psa_generate_key_custom()
+ *       with the custom production parameters #PSA_CUSTOM_KEY_PARAMETERS_INIT
+ *       and `custom_data_length == 0` (i.e. `custom_data` is empty).
  *
  * \param[in] attributes    The attributes for the new key.
  * \param[out] key          On success, an identifier for the newly created
@@ -4137,7 +4135,7 @@
  * See the description of psa_generate_key() for the operation of this
  * function with the default production parameters. In addition, this function
  * supports the following production customizations, described in more detail
- * in the documentation of ::psa_key_production_parameters_t:
+ * in the documentation of ::psa_custom_key_parameters_t:
  *
  * - RSA keys: generation with a custom public exponent.
  *
@@ -4145,13 +4143,14 @@
  *       versions of Mbed TLS.
  *
  * \param[in] attributes    The attributes for the new key.
- * \param[in] params        Customization parameters for the key generation.
- *                          When this is #PSA_KEY_PRODUCTION_PARAMETERS_INIT
- *                          with \p params_data_length = 0,
+ * \param[in] custom        Customization parameters for the key generation.
+ *                          When this is #PSA_CUSTOM_KEY_PARAMETERS_INIT
+ *                          with \p custom_data_length = 0,
  *                          this function is equivalent to
  *                          psa_generate_key().
- * \param params_data_length
- *                          Length of `params->data` in bytes.
+ * \param[in] custom_data   Variable-length data associated with \c custom.
+ * \param custom_data_length
+ *                          Length of `custom_data` in bytes.
  * \param[out] key          On success, an identifier for the newly created
  *                          key. For persistent keys, this is the key
  *                          identifier defined in \p attributes.
@@ -4180,10 +4179,11 @@
  *         It is implementation-dependent whether a failure to initialize
  *         results in this error code.
  */
-psa_status_t psa_generate_key_ext(const psa_key_attributes_t *attributes,
-                                  const psa_key_production_parameters_t *params,
-                                  size_t params_data_length,
-                                  mbedtls_svc_key_id_t *key);
+psa_status_t psa_generate_key_custom(const psa_key_attributes_t *attributes,
+                                     const psa_custom_key_parameters_t *custom,
+                                     const uint8_t *custom_data,
+                                     size_t custom_data_length,
+                                     mbedtls_svc_key_id_t *key);
 
 /**@}*/
 
diff --git a/tf-psa-crypto/include/psa/crypto_struct.h b/tf-psa-crypto/include/psa/crypto_struct.h
index 3913551..eabc2f4 100644
--- a/tf-psa-crypto/include/psa/crypto_struct.h
+++ b/tf-psa-crypto/include/psa/crypto_struct.h
@@ -223,21 +223,19 @@
     return v;
 }
 
-struct psa_key_production_parameters_s {
+struct psa_custom_key_parameters_s {
     /* Future versions may add other fields in this structure. */
     uint32_t flags;
-    uint8_t data[];
 };
 
 /** The default production parameters for key generation or key derivation.
  *
- * Calling psa_generate_key_ext() or psa_key_derivation_output_key_ext()
- * with `params=PSA_KEY_PRODUCTION_PARAMETERS_INIT` and
- * `params_data_length == 0` is equivalent to
- * calling psa_generate_key() or psa_key_derivation_output_key()
+ * Calling psa_generate_key_custom() or psa_key_derivation_output_key_custom()
+ * with `custom=PSA_CUSTOM_KEY_PARAMETERS_INIT` and `custom_data_length=0` is
+ * equivalent to calling psa_generate_key() or psa_key_derivation_output_key()
  * respectively.
  */
-#define PSA_KEY_PRODUCTION_PARAMETERS_INIT { 0 }
+#define PSA_CUSTOM_KEY_PARAMETERS_INIT { 0 }
 
 struct psa_key_policy_s {
     psa_key_usage_t MBEDTLS_PRIVATE(usage);
diff --git a/tf-psa-crypto/include/psa/crypto_types.h b/tf-psa-crypto/include/psa/crypto_types.h
index c21bad8..bb857ab 100644
--- a/tf-psa-crypto/include/psa/crypto_types.h
+++ b/tf-psa-crypto/include/psa/crypto_types.h
@@ -457,27 +457,27 @@
 
 /** \brief Custom parameters for key generation or key derivation.
  *
- * This is a structure type with at least the following fields:
+ * This is a structure type with at least the following field:
  *
  * - \c flags: an unsigned integer type. 0 for the default production parameters.
- * - \c data: a flexible array of bytes.
  *
- * The interpretation of this structure depend on the type of the
- * created key.
+ * Functions that take such a structure as input also take an associated
+ * input buffer \c custom_data of length \c custom_data_length.
+ *
+ * The interpretation of this structure and the associated \c custom_data
+ * parameter depend on the type of the created key.
  *
  * - #PSA_KEY_TYPE_RSA_KEY_PAIR:
  *     - \c flags: must be 0.
- *     - \c data: the public exponent, in little-endian order.
+ *     - \c custom_data: the public exponent, in little-endian order.
  *       This must be an odd integer and must not be 1.
  *       Implementations must support 65537, should support 3 and may
  *       support other values.
  *       When not using a driver, Mbed TLS supports values up to \c INT_MAX.
- *       If this is empty or if the custom production parameters are omitted
- *       altogether, the default value 65537 is used.
+ *       If this is empty, the default value 65537 is used.
  * - Other key types: reserved for future use. \c flags must be 0.
- *
  */
-typedef struct psa_key_production_parameters_s psa_key_production_parameters_t;
+typedef struct psa_custom_key_parameters_s psa_custom_key_parameters_t;
 
 /**@}*/
 
diff --git a/tf-psa-crypto/tests/suites/test_suite_psa_crypto.data b/tf-psa-crypto/tests/suites/test_suite_psa_crypto.data
index 32c7274..eb84bc5 100644
--- a/tf-psa-crypto/tests/suites/test_suite_psa_crypto.data
+++ b/tf-psa-crypto/tests/suites/test_suite_psa_crypto.data
@@ -6935,17 +6935,17 @@
 depends_on:PSA_WANT_ALG_PBKDF2_AES_CMAC_PRF_128:PSA_WANT_ALG_CMAC:PSA_WANT_KEY_TYPE_AES:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
 derive_key_type:PSA_ALG_PBKDF2_AES_CMAC_PRF_128:"706173737764":"01":"73616c74":PSA_KEY_TYPE_AES:256:"28e288c6345bb5ecf7ca70274208a3ba0f1148b5868537d5e09d3ee6813b1f52"
 
-PSA key derivation: default params -> AES-128
+PSA key derivation custom: default -> AES-128
 depends_on:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256:PSA_WANT_KEY_TYPE_AES
-derive_key_ext:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:0:"":PSA_SUCCESS:"3cb25f25faacd57a90434f64d0362f2a"
+derive_key_custom:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:0:"":PSA_SUCCESS:"3cb25f25faacd57a90434f64d0362f2a"
 
-PSA key derivation: params.flags=1 -> AES-128
+PSA key derivation custom: flags=1 -> AES-128
 depends_on:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256:PSA_WANT_KEY_TYPE_AES
-derive_key_ext:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:1:"":PSA_ERROR_INVALID_ARGUMENT:""
+derive_key_custom:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:1:"":PSA_ERROR_INVALID_ARGUMENT:""
 
-PSA key derivation: params.data non-empty -> AES-128
+PSA key derivation custom: data non-empty -> AES-128
 depends_on:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256:PSA_WANT_KEY_TYPE_AES
-derive_key_ext:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:0:"2a":PSA_ERROR_INVALID_ARGUMENT:""
+derive_key_custom:PSA_ALG_HKDF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_AES:128:0:"2a":PSA_ERROR_INVALID_ARGUMENT:""
 
 PSA key derivation: invalid type (0)
 depends_on:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256
@@ -7520,82 +7520,82 @@
 depends_on:PSA_WANT_ALG_FFDH:PSA_WANT_KEY_TYPE_DH_KEY_PAIR_GENERATE
 generate_key:PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919):1024:PSA_KEY_USAGE_EXPORT:PSA_ALG_FFDH:PSA_ERROR_NOT_SUPPORTED:0
 
-PSA generate key ext: RSA, params.flags=1
+PSA generate key custom: RSA, flags=1
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:1:"":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:1:"":PSA_ERROR_INVALID_ARGUMENT
 
-PSA generate key ext: RSA, empty e
+PSA generate key custom: RSA, empty e
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=3
+PSA generate key custom: RSA, e=3
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"03":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"03":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=3 with leading zeros
+PSA generate key custom: RSA, e=3 with leading zeros
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"000003":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"000003":PSA_SUCCESS
 
 # TODO: currently errors with NOT_SUPPORTED because e is converted to an int
 # and the conversion errors out if there are too many digits without checking
 # for leading zeros. This is a very minor bug. Re-enable this test when this
 # bug is fixed.
-#PSA generate key ext: RSA, e=3 with many leading zeros
+#PSA generate key custom: RSA, e=3 with many leading zeros
 #depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-#generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"0000000000000000000000000000000003":PSA_SUCCESS
+#generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"0000000000000000000000000000000003":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=513
+PSA generate key custom: RSA, e=513
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"0201":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"0201":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=65537
+PSA generate key custom: RSA, e=65537
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"010001":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"010001":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=2^31-1
+PSA generate key custom: RSA, e=2^31-1
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:PSA_WANT_ALG_RSA_PKCS1V15_CRYPT:INT_MAX>=0x7fffffff
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"7fffffff":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_RSA_PKCS1V15_CRYPT:0:"7fffffff":PSA_SUCCESS
 
-PSA generate key ext: RSA, e=2^31+3 (too large for built-in RSA)
+PSA generate key custom: RSA, e=2^31+3 (too large for built-in RSA)
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:!MBEDTLS_PSA_ACCEL_KEY_TYPE_RSA_KEY_PAIR_GENERATE:INT_MAX<=0x7fffffff
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"80000003":PSA_ERROR_NOT_SUPPORTED
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"80000003":PSA_ERROR_NOT_SUPPORTED
 
-PSA generate key ext: RSA, e=2^64+3 (too large for built-in RSA)
+PSA generate key custom: RSA, e=2^64+3 (too large for built-in RSA)
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE:!MBEDTLS_PSA_ACCEL_KEY_TYPE_RSA_KEY_PAIR_GENERATE:INT_MAX<=0xffffffffffffffff
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"010000000000000003":PSA_ERROR_NOT_SUPPORTED
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"010000000000000003":PSA_ERROR_NOT_SUPPORTED
 
-PSA generate key ext: RSA, e=1
+PSA generate key custom: RSA, e=1
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"01":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"01":PSA_ERROR_INVALID_ARGUMENT
 
-PSA generate key ext: RSA, e=0
+PSA generate key custom: RSA, e=0
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"00":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"00":PSA_ERROR_INVALID_ARGUMENT
 
-PSA generate key ext: RSA, e=2
+PSA generate key custom: RSA, e=2
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"02":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"02":PSA_ERROR_INVALID_ARGUMENT
 
 # Check that with a driver, we reject a custom e as unsupported,
 # as opposed to silently using the default e.
 # When we add proper driver support, remove this test case and remove
 # the dependency on MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE from
 # the positive/invalid_argument test cases.
-PSA generate key ext: RSA, e=3 with driver and no fallback (not yet supported)
+PSA generate key custom: RSA, e=3 with driver and no fallback (not yet supported)
 depends_on:PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE:!MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE
-generate_key_ext:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"03":PSA_ERROR_NOT_SUPPORTED
+generate_key_custom:PSA_KEY_TYPE_RSA_KEY_PAIR:PSA_VENDOR_RSA_GENERATE_MIN_KEY_BITS:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:0:0:"03":PSA_ERROR_NOT_SUPPORTED
 
-PSA generate key ext: ECC, flags=0
+PSA generate key custom: ECC, flags=0
 depends_on:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_GENERATE:PSA_WANT_ECC_SECP_R1_256:PSA_WANT_ALG_ECDH
-generate_key_ext:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:0:"":PSA_SUCCESS
+generate_key_custom:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:0:"":PSA_SUCCESS
 
-PSA generate key ext: ECC, flags=1
+PSA generate key custom: ECC, flags=1
 depends_on:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_GENERATE:PSA_WANT_ECC_SECP_R1_256:PSA_WANT_ALG_ECDH
-generate_key_ext:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:1:"":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:1:"":PSA_ERROR_INVALID_ARGUMENT
 
-PSA generate key ext: ECC, params.data non-empty
+PSA generate key custom: ECC, data non-empty
 depends_on:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_GENERATE:PSA_WANT_ECC_SECP_R1_256:PSA_WANT_ALG_ECDH
-generate_key_ext:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:0:"2a":PSA_ERROR_INVALID_ARGUMENT
+generate_key_custom:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):256:PSA_KEY_USAGE_DERIVE:PSA_ALG_ECDH:0:"2a":PSA_ERROR_INVALID_ARGUMENT
 
 PSA concurrent key generation: bad type (RSA public key)
 depends_on:PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY:MBEDTLS_THREADING_PTHREAD
@@ -7741,9 +7741,6 @@
 depends_on:PSA_WANT_ALG_FFDH:PSA_WANT_KEY_TYPE_DH_KEY_PAIR_GENERATE:MBEDTLS_THREADING_PTHREAD
 concurrently_generate_keys:PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919):1024:PSA_KEY_USAGE_EXPORT:PSA_ALG_FFDH:PSA_ERROR_NOT_SUPPORTED:0:8:5
 
-Key production parameters initializers
-key_production_parameters_init:
-
 PSA import persistent key: raw data, 8 bits
 depends_on:MBEDTLS_PSA_CRYPTO_STORAGE_C
 persistent_key_load_key_from_storage:"2a":PSA_KEY_TYPE_RAW_DATA:8:PSA_KEY_USAGE_EXPORT:0:IMPORT_KEY
diff --git a/tf-psa-crypto/tests/suites/test_suite_psa_crypto.function b/tf-psa-crypto/tests/suites/test_suite_psa_crypto.function
index 0c8552b..f6503f7 100644
--- a/tf-psa-crypto/tests/suites/test_suite_psa_crypto.function
+++ b/tf-psa-crypto/tests/suites/test_suite_psa_crypto.function
@@ -1312,30 +1312,6 @@
 }
 #endif /* PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE */
 
-static int setup_key_production_parameters(
-    psa_key_production_parameters_t **params, size_t *params_data_length,
-    int flags_arg, const data_t *params_data)
-{
-    *params_data_length = params_data->len;
-    /* If there are N bytes of padding at the end of
-     * psa_key_production_parameters_t, then it's enough to allocate
-     * MIN(sizeof(psa_key_production_parameters_t),
-     *     offsetof(psa_key_production_parameters_t, data) + params_data_length).
-     *
-     * For simplicity, here, we allocate up to N more bytes than necessary.
-     * In practice, the current layout of psa_key_production_parameters_t
-     * makes padding extremely unlikely, so we don't worry about testing
-     * that the library code doesn't try to access these extra N bytes.
-     */
-    *params = mbedtls_calloc(1, sizeof(**params) + *params_data_length);
-    TEST_ASSERT(*params != NULL);
-    (*params)->flags = (uint32_t) flags_arg;
-    memcpy((*params)->data, params_data->x, params_data->len);
-    return 1;
-exit:
-    return 0;
-}
-
 #if defined(MBEDTLS_THREADING_PTHREAD)
 
 typedef struct same_key_context {
@@ -9592,23 +9568,23 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void derive_key_ext(int alg_arg,
-                    data_t *key_data,
-                    data_t *input1,
-                    data_t *input2,
-                    int key_type_arg, int bits_arg,
-                    int flags_arg,
-                    data_t *params_data,
-                    psa_status_t expected_status,
-                    data_t *expected_export)
+void derive_key_custom(int alg_arg,
+                       data_t *key_data,
+                       data_t *input1,
+                       data_t *input2,
+                       int key_type_arg, int bits_arg,
+                       int flags_arg,
+                       data_t *custom_data,
+                       psa_status_t expected_status,
+                       data_t *expected_export)
 {
     mbedtls_svc_key_id_t base_key = MBEDTLS_SVC_KEY_ID_INIT;
     mbedtls_svc_key_id_t derived_key = MBEDTLS_SVC_KEY_ID_INIT;
     const psa_algorithm_t alg = alg_arg;
     const psa_key_type_t key_type = key_type_arg;
     const size_t bits = bits_arg;
-    psa_key_production_parameters_t *params = NULL;
-    size_t params_data_length = 0;
+    psa_custom_key_parameters_t custom = PSA_CUSTOM_KEY_PARAMETERS_INIT;
+    custom.flags = flags_arg;
     psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;
     const size_t export_buffer_size =
         PSA_EXPORT_KEY_OUTPUT_SIZE(key_type, bits);
@@ -9638,14 +9614,11 @@
     psa_set_key_algorithm(&derived_attributes, 0);
     psa_set_key_type(&derived_attributes, key_type);
     psa_set_key_bits(&derived_attributes, bits);
-    if (!setup_key_production_parameters(&params, &params_data_length,
-                                         flags_arg, params_data)) {
-        goto exit;
-    }
 
-    TEST_EQUAL(psa_key_derivation_output_key_ext(&derived_attributes, &operation,
-                                                 params, params_data_length,
-                                                 &derived_key),
+    TEST_EQUAL(psa_key_derivation_output_key_custom(
+                   &derived_attributes, &operation,
+                   &custom, custom_data->x, custom_data->len,
+                   &derived_key),
                expected_status);
 
     if (expected_status == PSA_SUCCESS) {
@@ -9658,7 +9631,6 @@
 
 exit:
     mbedtls_free(export_buffer);
-    mbedtls_free(params);
     psa_key_derivation_abort(&operation);
     psa_destroy_key(base_key);
     psa_destroy_key(derived_key);
@@ -10153,13 +10125,13 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void generate_key_ext(int type_arg,
-                      int bits_arg,
-                      int usage_arg,
-                      int alg_arg,
-                      int flags_arg,
-                      data_t *params_data,
-                      int expected_status_arg)
+void generate_key_custom(int type_arg,
+                         int bits_arg,
+                         int usage_arg,
+                         int alg_arg,
+                         int flags_arg,
+                         data_t *custom_data,
+                         int expected_status_arg)
 {
     mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
     psa_key_type_t type = type_arg;
@@ -10168,8 +10140,8 @@
     psa_algorithm_t alg = alg_arg;
     psa_status_t expected_status = expected_status_arg;
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
-    psa_key_production_parameters_t *params = NULL;
-    size_t params_data_length = 0;
+    psa_custom_key_parameters_t custom = PSA_CUSTOM_KEY_PARAMETERS_INIT;
+    custom.flags = flags_arg;
     psa_key_attributes_t got_attributes = PSA_KEY_ATTRIBUTES_INIT;
 
     PSA_ASSERT(psa_crypto_init());
@@ -10179,15 +10151,11 @@
     psa_set_key_type(&attributes, type);
     psa_set_key_bits(&attributes, bits);
 
-    if (!setup_key_production_parameters(&params, &params_data_length,
-                                         flags_arg, params_data)) {
-        goto exit;
-    }
-
     /* Generate a key */
-    psa_status_t status = psa_generate_key_ext(&attributes,
-                                               params, params_data_length,
-                                               &key);
+    psa_status_t status =
+        psa_generate_key_custom(&attributes,
+                                &custom, custom_data->x, custom_data->len,
+                                &key);
 
     TEST_EQUAL(status, expected_status);
     if (expected_status != PSA_SUCCESS) {
@@ -10201,7 +10169,7 @@
 
 #if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_GENERATE)
     if (type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
-        TEST_ASSERT(rsa_test_e(key, bits, params_data));
+        TEST_ASSERT(rsa_test_e(key, bits, custom_data));
     }
 #endif
 
@@ -10216,24 +10184,11 @@
      * thus reset them as required.
      */
     psa_reset_key_attributes(&got_attributes);
-    mbedtls_free(params);
     psa_destroy_key(key);
     PSA_DONE();
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
-void key_production_parameters_init()
-{
-    psa_key_production_parameters_t init = PSA_KEY_PRODUCTION_PARAMETERS_INIT;
-    psa_key_production_parameters_t zero;
-    memset(&zero, 0, sizeof(zero));
-
-    TEST_EQUAL(init.flags, 0);
-    TEST_EQUAL(zero.flags, 0);
-}
-/* END_CASE */
-
 /* BEGIN_CASE depends_on:MBEDTLS_PSA_CRYPTO_STORAGE_C */
 void persistent_key_load_key_from_storage(data_t *data,
                                           int type_arg, int bits_arg,