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add vb2api_get_pcr_digest

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this api allows firmware to get the digest indicating boot mode status.

BUG=chromium:451609
TEST=VBOOT2=1 make run2tests
BRANCH=tot

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Change-Id: Idca7bc5f6aed947689ad7cf219805aad35047c7d
Reviewed-on: https://chromium-review.googlesource.com/244542
This commit is contained in:
Daisuke Nojiri
2015-01-29 14:37:25 -08:00
committed by ChromeOS Commit Bot
parent 2559338dbd
commit 62d482ecdd
9 changed files with 198 additions and 2 deletions
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31
firmware/2lib/2api.c
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@@ -14,6 +14,7 @@
#include "2secdata.h"
#include "2sha.h"
#include "2rsa.h"
#include "2tpm_bootmode.h"
int vb2api_secdata_check(const struct vb2_context *ctx)
{
@@ -123,3 +124,33 @@ int vb2api_extend_hash(struct vb2_context *ctx,
else
return vb2_digest_extend(dc, buf, size);
}
int vb2api_get_pcr_digest(struct vb2_context *ctx,
enum vb2_pcr_digest which_digest,
uint8_t *dest,
uint32_t *dest_size)
{
const uint8_t *digest;
uint32_t digest_size;
switch (which_digest) {
case BOOT_MODE_PCR:
digest = vb2_get_boot_state_digest(ctx);
digest_size = VB2_SHA1_DIGEST_SIZE;
break;
case HWID_DIGEST_PCR:
digest = vb2_get_sd(ctx)->gbb_hwid_digest;
digest_size = VB2_GBB_HWID_DIGEST_SIZE;
break;
default:
return VB2_ERROR_API_PCR_DIGEST;
}
if (digest == NULL || *dest_size < digest_size)
return VB2_ERROR_API_PCR_DIGEST_BUF;
memcpy(dest, digest, digest_size);
*dest_size = digest_size;
return VB2_SUCCESS;
}