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/* Copyright (c) 2013 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.
*
* High-level firmware API for loading and verifying rewritable firmware.
* (Firmware portion)
*/
#include "2sysincludes.h"
#include "2common.h"
#include "2misc.h"
#include "sysincludes.h"
#include "gbb_access.h"
#include "load_kernel_fw.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_struct.h"
static VbError_t VbGbbReadData(struct vb2_context *ctx,
uint32_t offset, uint32_t size, void *buf)
{
if (vb2ex_read_resource(ctx, VB2_RES_GBB, offset, buf, size))
return VBERROR_INVALID_GBB;
return VBERROR_SUCCESS;
}
VbError_t VbGbbReadHWID(struct vb2_context *ctx, char *hwid, uint32_t max_size)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
if (!max_size)
return VBERROR_INVALID_PARAMETER;
*hwid = '\0';
StrnAppend(hwid, "{INVALID}", max_size);
if (!ctx)
return VBERROR_INVALID_GBB;
if (0 == gbb->hwid_size) {
VB2_DEBUG("VbHWID(): invalid hwid size\n");
return VBERROR_SUCCESS; /* oddly enough! */
}
if (gbb->hwid_size > max_size) {
VB2_DEBUG("VbDisplayDebugInfo(): invalid hwid offset/size\n");
return VBERROR_INVALID_PARAMETER;
}
return VbGbbReadData(ctx, gbb->hwid_offset,
gbb->hwid_size, hwid);
}
static VbError_t VbGbbReadKey(struct vb2_context *ctx, uint32_t offset,
VbPublicKey **keyp)
{
VbPublicKey hdr, *key;
VbError_t ret;
uint32_t size;
ret = VbGbbReadData(ctx, offset, sizeof(VbPublicKey), &hdr);
if (ret)
return ret;
/* Deal with a zero-size key (used in testing) */
size = hdr.key_offset + hdr.key_size;
if (size < sizeof(hdr))
size = sizeof(hdr);
key = malloc(size);
ret = VbGbbReadData(ctx, offset, size, key);
if (ret) {
free(key);
return ret;
}
*keyp = key;
return VBERROR_SUCCESS;
}
VbError_t VbGbbReadRootKey(struct vb2_context *ctx, VbPublicKey **keyp)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
return VbGbbReadKey(ctx, gbb->rootkey_offset, keyp);
}
VbError_t VbGbbReadRecoveryKey(struct vb2_context *ctx, VbPublicKey **keyp)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
return VbGbbReadKey(ctx, gbb->recovery_key_offset, keyp);
}
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