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/* Copyright (c) 2014 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.
*
* Host functions for keyblocks
*/
#include "2common.h"
#include "2rsa.h"
#include "2sysincludes.h"
#include "host_common.h"
#include "host_fw_preamble2.h"
#include "host_key2.h"
#include "host_keyblock2.h"
#include "host_misc.h"
#include "host_signature2.h"
#include "vb21_common.h"
vb2_error_t vb21_fw_preamble_create(struct vb21_fw_preamble **fp_ptr,
const struct vb2_private_key *signing_key,
const struct vb21_signature **hash_list,
uint32_t hash_count, uint32_t fw_version,
uint32_t flags, const char *desc)
{
struct vb21_fw_preamble fp = {
.c.magic = VB21_MAGIC_FW_PREAMBLE,
.c.struct_version_major = VB21_FW_PREAMBLE_VERSION_MAJOR,
.c.struct_version_minor = VB21_FW_PREAMBLE_VERSION_MAJOR,
.c.fixed_size = sizeof(fp),
.c.desc_size = vb2_desc_size(desc),
.flags = flags,
.fw_version = fw_version,
.hash_count = hash_count,
};
uint32_t hash_next;
uint32_t sig_size;
uint8_t *buf;
int i;
*fp_ptr = NULL;
/* Determine component sizes */
hash_next = fp.hash_offset = fp.c.fixed_size + fp.c.desc_size;
for (i = 0; i < hash_count; i++)
hash_next += hash_list[i]->c.total_size;
fp.sig_offset = hash_next;
if (vb21_sig_size_for_key(&sig_size, signing_key, NULL))
return VB2_FW_PREAMBLE_CREATE_SIG_SIZE;
fp.c.total_size = fp.sig_offset + sig_size;
/* Allocate buffer and copy components */
buf = calloc(fp.c.total_size, 1);
if (!buf)
return VB2_FW_PREAMBLE_CREATE_ALLOC;
memcpy(buf, &fp, sizeof(fp));
if (fp.c.desc_size)
strcpy((char *)buf + fp.c.fixed_size, desc);
hash_next = fp.hash_offset;
for (i = 0; i < hash_count; i++) {
memcpy(buf + hash_next, hash_list[i],
hash_list[i]->c.total_size);
hash_next += hash_list[i]->c.total_size;
}
/* Sign the preamble */
if (vb21_sign_object(buf, fp.sig_offset, signing_key, NULL)) {
free(buf);
return VB2_FW_PREAMBLE_CREATE_SIGN;
}
*fp_ptr = (struct vb21_fw_preamble *)buf;
return VB2_SUCCESS;
}
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