diff --git a/lib/crc8.c b/lib/crc8.c
index 20d46d1..811e199 100644
--- a/lib/crc8.c
+++ b/lib/crc8.c
@@ -32,3 +32,9 @@
 
 	return crc;
 }
+
+void crc8_wd_buf(const unsigned char *input, unsigned int len,
+		 unsigned char output[1], unsigned int chunk_sz)
+{
+	*output = crc8(0, input, len);
+}