- Added reset functionality for HMAC context. Speed-up for some use-cases.

library/md5.c

@@ -375,6 +375,15 @@ void md5_hmac_finish( md5_context *ctx, unsigned char output[16] )
     memset( tmpbuf, 0, sizeof( tmpbuf ) );
 }
 
+/*
+ * MD5 HMAC context reset
+ */
+void md5_hmac_reset( md5_context *ctx )
+{
+    md5_starts( ctx );
+    md5_update( ctx, ctx->ipad, 64 );
+}
+
 /*
  * output = HMAC-MD5( hmac key, input buffer )
  */