diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 00e4f2aa9..4221079be 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3796,19 +3796,24 @@ exit:
 
 psa_status_t psa_aead_encrypt(mbedtls_svc_key_id_t key,
                               psa_algorithm_t alg,
-                              const uint8_t *nonce,
+                              const uint8_t *nonce_external,
                               size_t nonce_length,
-                              const uint8_t *additional_data,
+                              const uint8_t *additional_data_external,
                               size_t additional_data_length,
-                              const uint8_t *plaintext,
+                              const uint8_t *plaintext_external,
                               size_t plaintext_length,
-                              uint8_t *ciphertext,
+                              uint8_t *ciphertext_external,
                               size_t ciphertext_size,
                               size_t *ciphertext_length)
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_key_slot_t *slot;
 
+    LOCAL_INPUT_DECLARE(nonce_external, nonce);
+    LOCAL_INPUT_DECLARE(additional_data_external, additional_data);
+    LOCAL_INPUT_DECLARE(plaintext_external, plaintext);
+    LOCAL_OUTPUT_DECLARE(ciphertext_external, ciphertext);
+
     *ciphertext_length = 0;
 
     if (!PSA_ALG_IS_AEAD(alg) || PSA_ALG_IS_WILDCARD(alg)) {
@@ -3825,6 +3830,11 @@ psa_status_t psa_aead_encrypt(mbedtls_svc_key_id_t key,
         .core = slot->attr
     };
 
+    LOCAL_INPUT_ALLOC(nonce_external, nonce_length, nonce);
+    LOCAL_INPUT_ALLOC(additional_data_external, additional_data_length, additional_data);
+    LOCAL_INPUT_ALLOC(plaintext_external, plaintext_length, plaintext);
+    LOCAL_OUTPUT_ALLOC(ciphertext_external, ciphertext_size, ciphertext);
+
     status = psa_driver_wrapper_aead_encrypt(
         &attributes, slot->key.data, slot->key.bytes,
         alg,
@@ -3837,6 +3847,15 @@ psa_status_t psa_aead_encrypt(mbedtls_svc_key_id_t key,
         memset(ciphertext, 0, ciphertext_size);
     }
 
+/* Exit label is only used for buffer copying, prevent unused warnings. */
+#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
+exit:
+#endif
+    LOCAL_INPUT_FREE(nonce_external, nonce);
+    LOCAL_INPUT_FREE(additional_data_external, additional_data);
+    LOCAL_INPUT_FREE(plaintext_external, plaintext);
+    LOCAL_OUTPUT_FREE(ciphertext_external, ciphertext);
+
     psa_unlock_key_slot(slot);
 
     return status;