diff --git a/library/common.h b/library/common.h
index c064724..c366156 100644
--- a/library/common.h
+++ b/library/common.h
@@ -29,6 +29,7 @@
 #include "mbedtls/config.h"
 #endif
 
+#include <stddef.h>
 #include <stdint.h>
 
 /** Helper to define a function as static except when building invasive tests.
@@ -52,6 +53,42 @@
 #define MBEDTLS_STATIC_TESTABLE static
 #endif
 
+/** Return an offset into a buffer.
+ *
+ * This is just the addition of an offset to a pointer, except that this
+ * function also accepts an offset of 0 into a buffer whose pointer is null.
+ *
+ * \param p     Pointer to a buffer of at least n bytes.
+ *              This may be \p NULL if \p n is zero.
+ * \param n     An offset in bytes.
+ * \return      Pointer to offset \p n in the buffer \p p.
+ *              Note that this is only a valid pointer if the size of the
+ *              buffer is at least \p n + 1.
+ */
+static inline unsigned char *mbedtls_buffer_offset(
+    unsigned char *p, size_t n )
+{
+    return( p == NULL ? NULL : p + n );
+}
+
+/** Return an offset into a read-only buffer.
+ *
+ * This is just the addition of an offset to a pointer, except that this
+ * function also accepts an offset of 0 into a buffer whose pointer is null.
+ *
+ * \param p     Pointer to a buffer of at least n bytes.
+ *              This may be \p NULL if \p n is zero.
+ * \param n     An offset in bytes.
+ * \return      Pointer to offset \p n in the buffer \p p.
+ *              Note that this is only a valid pointer if the size of the
+ *              buffer is at least \p n + 1.
+ */
+static inline const unsigned char *mbedtls_buffer_offset_const(
+    const unsigned char *p, size_t n )
+{
+    return( p == NULL ? NULL : p + n );
+}
+
 /** Byte Reading Macros
  *
  * Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index f76c829..10c7d1e 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3638,8 +3638,8 @@
     status = psa_driver_wrapper_cipher_encrypt(
         &attributes, slot->key.data, slot->key.bytes,
         alg, local_iv, default_iv_length, input, input_length,
-        output + default_iv_length, output_size - default_iv_length,
-        output_length );
+        mbedtls_buffer_offset( output, default_iv_length ),
+        output_size - default_iv_length, output_length );
 
 exit:
     unlock_status = psa_unlock_key_slot( slot );
diff --git a/library/psa_crypto_cipher.c b/library/psa_crypto_cipher.c
index 38962cd..13006fa 100644
--- a/library/psa_crypto_cipher.c
+++ b/library/psa_crypto_cipher.c
@@ -514,9 +514,10 @@
     if( status != PSA_SUCCESS )
         goto exit;
 
-    status = mbedtls_psa_cipher_finish( &operation, output + update_output_length,
-                            output_size - update_output_length,
-                            &finish_output_length );
+    status = mbedtls_psa_cipher_finish(
+        &operation,
+        mbedtls_buffer_offset( output, update_output_length ),
+        output_size - update_output_length, &finish_output_length );
     if( status != PSA_SUCCESS )
         goto exit;
 
@@ -560,17 +561,20 @@
             goto exit;
     }
 
-    status = mbedtls_psa_cipher_update( &operation, input + operation.iv_length,
-                                        input_length - operation.iv_length,
-                                        output, output_size, &olength );
+    status = mbedtls_psa_cipher_update(
+        &operation,
+        mbedtls_buffer_offset_const( input, operation.iv_length ),
+        input_length - operation.iv_length,
+        output, output_size, &olength );
     if( status != PSA_SUCCESS )
         goto exit;
 
     accumulated_length = olength;
 
-    status = mbedtls_psa_cipher_finish( &operation, output + accumulated_length,
-                                        output_size - accumulated_length,
-                                        &olength );
+    status = mbedtls_psa_cipher_finish(
+        &operation,
+        mbedtls_buffer_offset( output, accumulated_length ),
+        output_size - accumulated_length, &olength );
     if( status != PSA_SUCCESS )
         goto exit;