[PATCH v3 07/14] bloblist: Change the checksum algorithm

[Raymond Mao]

From: Simon Glass <s...@chromium.org>

Use a sinple 8-bit checksum for bloblist, as specified by the spec
version 0.9

Signed-off-by: Simon Glass <s...@chromium.org>
Co-developed-by: Raymond Mao <raymond....@linaro.org>
Signed-off-by: Raymond Mao <raymond....@linaro.org>
Reviewed-by: Simon Glass <s...@chromium.org>
---
 common/bloblist.c  | 14 ++++++++------
 include/bloblist.h |  5 ++---
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/common/bloblist.c b/common/bloblist.c
index 88e2a0f5c0..32692d8319 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -13,6 +13,7 @@
 #include <malloc.h>
 #include <mapmem.h>
 #include <spl.h>
+#include <tables_csum.h>
 #include <asm/global_data.h>
 #include <u-boot/crc.h>
 
@@ -319,14 +320,15 @@ int bloblist_resize(uint tag, int new_size)
 static u32 bloblist_calc_chksum(struct bloblist_hdr *hdr)
 {
        struct bloblist_rec *rec;
-       u32 chksum;
+       u8 chksum;
 
-       chksum = crc32(0, (unsigned char *)hdr,
-                      offsetof(struct bloblist_hdr, chksum));
+       chksum = table_compute_checksum(hdr, hdr->hdr_size);
+       chksum += hdr->chksum;
        foreach_rec(rec, hdr) {
-               chksum = crc32(chksum, (void *)rec, rec_hdr_size(rec));
-               chksum = crc32(chksum, (void *)rec + rec_hdr_size(rec),
-                              rec->size);
+               chksum -= table_compute_checksum((void *)rec,
+                                                rec_hdr_size(rec));
+               chksum -= table_compute_checksum((void *)rec +
+                                                rec_hdr_size(rec), rec->size);
        }
 
        return chksum;
diff --git a/include/bloblist.h b/include/bloblist.h
index 68f97395b7..d2dcad69a1 100644
--- a/include/bloblist.h
+++ b/include/bloblist.h
@@ -174,11 +174,10 @@ enum bloblist_tag_t {
  *     sizeof(bloblist_hdr) since we need at least that much space to store a
  *     valid bloblist
  * @spare: Spare space (for future use)
- * @chksum: CRC32 for the entire bloblist allocated area. Since any of the
+ * @chksum: checksum for the entire bloblist allocated area. Since any of the
  *     blobs can be altered after being created, this checksum is only valid
  *     when the bloblist is finalised before jumping to the next stage of boot.
- *     Note that chksum is last to make it easier to exclude it from the
- *     checksum calculation.
+ *     This is the value needed to make all checksummed bytes sum to 0
  */
 struct bloblist_hdr {
        u32 magic;
-- 
2.25.1