- A error_strerror function() has been added to translate between error codes and their description.
 - The error codes have been remapped and combining error codes is now done with a PLUS instead of an OR as error codes used are negative.
 - Descriptions to all error codes have been added.
 - Generation script for error.c has been created to automatically generate error.c from the available error definitions in the headers.


diff --git a/include/polarssl/aes.h b/include/polarssl/aes.h
index 4b97568..7404e4e 100644
--- a/include/polarssl/aes.h
+++ b/include/polarssl/aes.h
@@ -32,8 +32,8 @@
 #define AES_ENCRYPT     1
 #define AES_DECRYPT     0
 
-#define POLARSSL_ERR_AES_INVALID_KEY_LENGTH                 -0x0800
-#define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH               -0x0810
+#define POLARSSL_ERR_AES_INVALID_KEY_LENGTH                -0x0020  /**< Invalid key length. */
+#define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH              -0x0022  /**< Invalid data input length. */
 
 /**
  * \brief          AES context structure