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vboot2: Add vb2_unpack_key2() and unit tests

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This unpacks new-style packed keys.

For now, it can also handle old-style packed keys by passing them to
the old unpacking function.  Once we've switched over to new-style
keys in the signing scripts, we'll remove the old format to save code
size.

Also added is a test library which converts from old to new struct
formats.  That should eventually get absorbed into futility, and the
test keys directory should have both old and new format packed keys in
it.

BUG=chromium:423882
BRANCH=none
TEST=VBOOT2=1 make runtests

Change-Id: I0fe31f124781d1ea1efedab65dcd6130bfca18dd
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/225490
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Randall Spangler
2014-10-23 17:38:18 -07:00
committed by chrome-internal-fetch
parent f6cfb974ce
commit d274a2e953
10 changed files with 341 additions and 3 deletions
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17
firmware/2lib/include/2common.h
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@@ -103,7 +103,7 @@ void *vb2_workbuf_realloc(struct vb2_workbuf *wb,
void vb2_workbuf_free(struct vb2_workbuf *wb, uint32_t size);
/* Check if a pointer is aligned on an align-byte boundary */
#define vb_aligned(ptr, align) (!(((uintptr_t)(ptr)) & ((align) - 1)))
#define vb2_aligned(ptr, align) (!(((uintptr_t)(ptr)) & ((align) - 1)))
/**
* Safer memcmp() for use in crypto.
@@ -233,6 +233,21 @@ int vb2_unpack_key(struct vb2_public_key *key,
const uint8_t *buf,
uint32_t size);
/**
* Unpack a key for use in verification
*
* The elements of the unpacked key will point into the source buffer, so don't
* free the source buffer until you're done with the key.
*
* @param key Destintion for unpacked key
* @param buf Source buffer containing packed key
* @param size Size of buffer in bytes
* @return VB2_SUCCESS, or non-zero error code if error.
*/
int vb2_unpack_key2(struct vb2_public_key *key,
const uint8_t *buf,
uint32_t size);
/* Size of work buffer sufficient for vb2_rsa_verify_digest() worst case */
#define VB2_VERIFY_DIGEST_WORKBUF_BYTES VB2_VERIFY_RSA_DIGEST_WORKBUF_BYTES