astlpc: Introduce protocol v3 with integrity checks
v3 of the binding adds a CRC-32 value as a medium-specific trailer to
each packet passing over the binding interface.
The patch includes a naive bit-shift implementation of CRC-32, we can
improve it later as necessary.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I93a95bccef30010d56e10e29b6d84554268ab7af
diff --git a/crc32.h b/crc32.h
new file mode 100644
index 0000000..c47a27e
--- /dev/null
+++ b/crc32.h
@@ -0,0 +1,9 @@
+#ifndef _CRC32_H
+#define _CRC32_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+uint32_t crc32(const void *buf, size_t len);
+
+#endif