Add HW_FAILED error codes for message digest modules
New error codes to report failures from alternative implementations of
MD2, MD4, MD5, RIPEMD160, SHA-1, SHA-256, SHA-512.
diff --git a/include/mbedtls/md5.h b/include/mbedtls/md5.h
index bbfcae1..dfd704c 100644
--- a/include/mbedtls/md5.h
+++ b/include/mbedtls/md5.h
@@ -32,6 +32,8 @@
#include <stddef.h>
#include <stdint.h>
+#define MBEDTLS_ERR_MD5_HW_ACCEL_FAILED -0x002F /**< MD5 hardware accelerator failed */
+
#if !defined(MBEDTLS_MD5_ALT)
// Regular implementation
//