diff --git a/library/psa_crypto_core.h b/library/psa_crypto_core.h
index 29b3b94bfe..4c38a7566f 100644
--- a/library/psa_crypto_core.h
+++ b/library/psa_crypto_core.h
@@ -854,4 +854,34 @@ psa_status_t mbedtls_psa_verify_hash_complete(
 psa_status_t mbedtls_psa_verify_hash_abort(
     mbedtls_psa_verify_hash_interruptible_operation_t *operation);
 
+/** Copy from an input buffer to a local copy.
+ *
+ * \param[in] input             Pointer to input buffer.
+ * \param[in] input_len         Length of the input buffer.
+ * \param[out] input_copy       Pointer to a local copy in which to store the input data.
+ * \param[out] input_copy_len   Length of the local copy buffer.
+ * \return                      #PSA_SUCCESS, if the buffer was successfully
+ *                              copied.
+ * \return                      #PSA_ERROR_BUFFER_TOO_SMALL, if the local copy
+ *                              is too small to hold contents of the
+ *                              input buffer.
+ */
+psa_status_t psa_crypto_copy_input(const uint8_t *input, size_t input_len,
+                                   uint8_t *input_copy, size_t input_copy_len);
+
+/** Copy from a local output buffer into a user-supplied one.
+ *
+ * \param[in] output_copy       Pointer to a local buffer containing the output.
+ * \param[in] output_copy_len   Length of the local buffer.
+ * \param[out] output           Pointer to user-supplied output buffer.
+ * \param[out] output_len       Length of the user-supplied output buffer.
+ * \return                      #PSA_SUCCESS, if the buffer was successfully
+ *                              copied.
+ * \return                      #PSA_ERROR_BUFFER_TOO_SMALL, if the
+ *                              user-supplied output buffer is too small to
+ *                              hold the contents of the local buffer.
+ */
+psa_status_t psa_crypto_copy_output(const uint8_t *output_copy, size_t output_copy_len,
+                                    uint8_t *output, size_t output_len);
+
 #endif /* PSA_CRYPTO_CORE_H */