tools: Improve comments in signing functions

Add some more comments to explain what is going on in the signing
functions. Fix two repeated typos.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/tools/fdt_host.h b/tools/fdt_host.h
index 15c07c7a96e..bc42306c9e5 100644
--- a/tools/fdt_host.h
+++ b/tools/fdt_host.h
@@ -27,6 +27,14 @@
  */
 int fdt_remove_unused_strings(const void *old, void *new);
 
+/**
+ * fit_check_sign() - Check a signature in a FIT
+ *
+ * @fit: FIT to check
+ * @key: Key FDT blob to check against
+ * @fit_uname_config: Name of configuration to check (NULL for default)
+ * @return 0 if OK, -ve if signature failed
+ */
 int fit_check_sign(const void *fit, const void *key,
 		   const char *fit_uname_config);