New tools to help debug vboot failures.

This adds some tools to help us figure out why a particular kernel isn't
booting. Often we suspect it's because it was signed with the wrong keys, or
has flags restricting its use to certain boot modes. This change adds some
tools to extract and display all the keys from the BIOS, and try them on the
various kernels. We also display the sha1sum of all the keys we find, to
make comparing them easier.

Change-Id: I38e447bf95cb6c3a0b87aa949611bb135f2f94b4

BUG=chromeos-partner:888
TEST=manual

To test, obtain a root shell, and run dev_debug_vboot. You should see lots
of useful information go by.

Review URL: http://codereview.chromium.org/3303018

2 files changed, 12 insertions, 0 deletions

diff --git a/host/include/host_misc.h b/host/include/host_misc.h
index abbfc0f6..cbf9eaff 100644
--- a/host/include/host_misc.h
+++ b/host/include/host_misc.h
@@ -24,5 +24,7 @@ uint8_t* ReadFile(const char* filename, uint64_t* size);
  * Returns 0 if success, 1 if error. */
 int WriteFile(const char* filename, const void *data, uint64_t size);
 
+/* Prints the sha1sum of the given VbPublicKey to stdout. */
+void PrintPubKeySha1Sum(VbPublicKey* key);
 
 #endif  /* VBOOT_REFERENCE_HOST_MISC_H_ */
diff --git a/host/lib/host_misc.c b/host/lib/host_misc.c
index d8f52970..91eaea25 100644
--- a/host/lib/host_misc.c
+++ b/host/lib/host_misc.c
@@ -66,3 +66,13 @@ int WriteFile(const char* filename, const void *data, uint64_t size) {
   fclose(f);
   return 0;
 }
+
+void PrintPubKeySha1Sum(VbPublicKey* key) {
+  uint8_t* buf = ((uint8_t *)key) + key->key_offset;
+  uint64_t buflen = key->key_size;
+  uint8_t* digest = DigestBuf(buf, buflen, SHA1_DIGEST_ALGORITHM);
+  int i;
+  for (i=0; i<SHA1_DIGEST_SIZE; i++)
+    printf("%02x", digest[i]);
+  Free(digest);
+}