bdb: Make 'futility show' support BDB

This patch makes futility show command support boot block descriptor (BDB)
of the common boot flow.

BUG=chromium:649554
BRANCH=none
TEST=make runtests. Ran futility show bdb.bin.

Change-Id: I5f199a32ab1c268351e822e37ed39e41ae19bc7a
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/388631
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/futility/bdb_helper.c b/futility/bdb_helper.c
new file mode 100644
index 00000000..d2f428c8
--- /dev/null
+++ b/futility/bdb_helper.c
@@ -0,0 +1,68 @@
+/* Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Boot descriptor block helper functions
+ */
+
+#include <stdio.h>
+
+#include "2sha.h"
+#include "bdb.h"
+#include "bdb_struct.h"
+#include "file_type.h"
+
+enum futil_file_type ft_recognize_bdb(uint8_t *buf, uint32_t len)
+{
+	const struct bdb_header *header = bdb_get_header(buf);
+
+	if (bdb_check_header(header, len))
+		return FILE_TYPE_UNKNOWN;
+
+	return FILE_TYPE_BDB;
+}
+
+static void print_digest(const char *label, const uint8_t *digest, size_t size)
+{
+	int i;
+
+	if (label)
+		printf("%s", label);
+	for (i = 0; i < size; i++)
+		printf("%02x", digest[i]);
+	printf("\n");
+}
+
+static void show_bdb_header(const uint8_t *bdb)
+{
+	const struct bdb_header *header = bdb_get_header(bdb);
+	const struct bdb_key *key = bdb_get_bdbkey(bdb);
+	uint8_t digest[BDB_SHA256_DIGEST_SIZE];
+
+	printf("BDB Header:\n");
+	printf("  Struct Version: 0x%x:0x%x\n",
+	       header->struct_major_version, header->struct_minor_version);
+
+	bdb_sha256(digest, key, key->struct_size);
+	print_digest("  BDB key digest: ", digest, sizeof(digest));
+	printf("            size: %d\n", key->struct_size);
+}
+
+
+int ft_show_bdb(const char *name, uint8_t *buf, uint32_t len, void *data)
+{
+	const struct bdb_header *header = bdb_get_header(buf);
+	int rv;
+
+	/* We can get here because of '--type' option */
+	rv  = bdb_check_header(header, len);
+	if (rv) {
+		fprintf(stderr, "ERROR: Invalid BDB blob: %d\n", rv);
+		return 1;
+	}
+
+	printf("Boot Descriptor Block: %s\n", name);
+	show_bdb_header(buf);
+
+	return 0;
+}