- 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/xtea.h b/include/polarssl/xtea.h
index 8f41d5d..e2adb87 100644
--- a/include/polarssl/xtea.h
+++ b/include/polarssl/xtea.h
@@ -39,7 +39,7 @@
 #define XTEA_ENCRYPT     1
 #define XTEA_DECRYPT     0
 
-#define POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH               -0x0820
+#define POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH             -0x0028  /**< The data input has an invalid length. */
 
 /**
  * \brief          XTEA context structure