diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h
index ffd6d3b..1ddde82 100644
--- a/include/mbedtls/aes.h
+++ b/include/mbedtls/aes.h
@@ -246,6 +246,32 @@
                        unsigned char *output );
 #endif /* MBEDTLS_CIPHER_MODE_CTR */
 
+/**
+ * \brief           Internal AES block encryption function
+ *                  (Only exposed to allow overriding it,
+ *                  see MBEDTLS_AES_ENCRYPT_ALT)
+ *
+ * \param ctx       AES context
+ * \param input     Plaintext block
+ * \param output    Output (ciphertext) block
+ */
+void mbedtls_aes_encrypt( mbedtls_aes_context *ctx,
+                          const unsigned char input[16],
+                          unsigned char output[16] );
+
+/**
+ * \brief           Internal AES block decryption function
+ *                  (Only exposed to allow overriding it,
+ *                  see MBEDTLS_AES_DECRYPT_ALT)
+ *
+ * \param ctx       AES context
+ * \param input     Ciphertext block
+ * \param output    Output (plaintext) block
+ */
+void mbedtls_aes_decrypt( mbedtls_aes_context *ctx,
+                          const unsigned char input[16],
+                          unsigned char output[16] );
+
 #ifdef __cplusplus
 }
 #endif