vboot: Move common code under common/vboot

This patch moves the code which can be shared with other data
verification schemes (e.g. RWSIG) under common/vboot. It also
adds unit tests for it.

BUG=b:38462249
BRANCH=none
TEST=make run-vboot. Verify verification succeeds on Fizz.

Change-Id: Icab4d96dd2c154a12b01c41ebe9b46286b4b590e
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/563463
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 45 insertions, 1 deletions

diff --git a/include/vboot.h b/include/vboot.h
index ba13328544..14f7a8f13c 100644
--- a/include/vboot.h
+++ b/include/vboot.h
@@ -3,6 +3,50 @@
  * found in the LICENSE file.
  */
 
+#include "common.h"
+#include "vb21_struct.h"
+#include "rsa.h"
+
+/**
+ * Validate key contents.
+ *
+ * @param key
+ * @return EC_SUCCESS or EC_ERROR_*
+ */
+int vb21_is_packed_key_valid(const struct vb21_packed_key *key);
+
+/**
+ * Validate signature contents.
+ *
+ * @param sig Signature to be validated.
+ * @param key Key to be used for validating <sig>.
+ * @return EC_SUCCESS or EC_ERROR_*
+ */
+int vb21_is_signature_valid(const struct vb21_signature *sig,
+			    const struct vb21_packed_key *key);
+
+/**
+ * Check data region is filled with ones
+ *
+ * @param data  Data to be validated.
+ * @param start Offset where validation starts.
+ * @param end   Offset where validation ends. data[end] won't be checked.
+ * @return EC_SUCCESS or EC_ERROR_*
+ */
+int vboot_is_padding_valid(const uint8_t *data, uint32_t start, uint32_t end);
+
+/**
+ * Verify data by RSA signature
+ *
+ * @param data Data to be verified.
+ * @param len  Number of bytes in <data>.
+ * @param key  Key to be used for verification.
+ * @param sig  Signature of <data>
+ * @return EC_SUCCESS or EC_ERROR_*
+ */
+int vboot_verify(const uint8_t *data, int len,
+		 const struct rsa_public_key *key, const uint8_t *sig);
+
 /**
  * Verify RW image and jump to it
  *
@@ -12,4 +56,4 @@
  * 3. Returns, requesting more power
  * 4. Returns, requesting recovery
  */
-void vboot_ec(void);
+void vboot_main(void);