Reserve -1 as an error code (used in programs)
diff --git a/include/polarssl/error.h b/include/polarssl/error.h
index ae46014..ceea3f0 100644
--- a/include/polarssl/error.h
+++ b/include/polarssl/error.h
@@ -47,9 +47,9 @@
* 7 bits - Low level module errors
*
* For historical reasons, low-level error codes are divided in even and odd,
- * and even codes were assigned first.
+ * even codes were assigned first, and -1 is reserved for other errors.
*
- * Low-level module errors (0x0001-0x00FF)
+ * Low-level module errors (0x0002-0x007E, 0x0003-0x007F)
*
* Module Nr Codes assigned
* MPI 7 0x0002-0x0010
@@ -75,9 +75,9 @@
* SHA512 1 0x007A-0x007A
* PBKDF2 1 0x007C-0x007C
* RIPEMD160 1 0x007E-0x007E
- * HMAC_DRBG 4 0x0001-0x0007
+ * HMAC_DRBG 4 0x0003-0x0009
*
- * High-level module nr (3 bits - 0x1...-0x8...)
+ * High-level module nr (3 bits - 0x0...-0x7...)
* Name ID Nr of Errors
* PEM 1 9
* PKCS#12 1 4 (Started from top)