diff --git a/include/polarssl/md.h b/include/polarssl/md.h
index 88596cb..b81ebf1 100644
--- a/include/polarssl/md.h
+++ b/include/polarssl/md.h
@@ -111,6 +111,8 @@
     /** Free the given context */
     void (*ctx_free_func)( void *ctx );
 
+    /** Internal use only */
+    void (*process_func)( void *ctx, const unsigned char *input );
 } md_info_t;
 
 /**
@@ -347,6 +349,9 @@
                 const unsigned char *input, size_t ilen,
                 unsigned char *output );
 
+/* Internal use */
+int md_process( md_context_t *ctx, const unsigned char *data );
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/polarssl/md2.h b/include/polarssl/md2.h
index 1f60470..02a0a10 100644
--- a/include/polarssl/md2.h
+++ b/include/polarssl/md2.h
@@ -146,6 +146,9 @@
  */
 int md2_self_test( int verbose );
 
+/* Internal use */
+void md2_process( md2_context *ctx );
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/polarssl/md4.h b/include/polarssl/md4.h
index 641edf1..4791fb1 100644
--- a/include/polarssl/md4.h
+++ b/include/polarssl/md4.h
@@ -152,6 +152,9 @@
  */
 int md4_self_test( int verbose );
 
+/* Internal use */
+void md4_process( md4_context *ctx, const unsigned char data[64] );
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/polarssl/sha4.h b/include/polarssl/sha4.h
index 6aae124..5563676 100644
--- a/include/polarssl/sha4.h
+++ b/include/polarssl/sha4.h
@@ -161,6 +161,9 @@
  */
 int sha4_self_test( int verbose );
 
+/* Internal use */
+void sha4_process( sha4_context *ctx, const unsigned char data[128] );
+
 #ifdef __cplusplus
 }
 #endif