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/* Copyright (c) 2011 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 verified boot.
*/
/* TODO: change all 'return 0', 'return 1' into meaningful return codes */
#include <string.h>
#include "host_common.h"
#include "cryptolib.h"
#include "utility.h"
#include "vboot_common.h"
VbECPreambleHeader* CreateECPreamble(
uint64_t firmware_version,
const VbSignature* body_digest,
const VbPrivateKey* signing_key,
uint32_t flags,
const char* name) {
VbECPreambleHeader* h;
uint64_t signed_size = (sizeof(VbECPreambleHeader) + body_digest->sig_size);
uint64_t block_size = signed_size + siglen_map[signing_key->algorithm];
uint8_t* body_digest_dest;
uint8_t* block_sig_dest;
VbSignature *sigtmp;
/* Allocate key block */
h = (VbECPreambleHeader*)malloc(block_size);
if (!h)
return NULL;
Memset(h, 0, block_size);
body_digest_dest = (uint8_t*)(h + 1);
block_sig_dest = body_digest_dest + body_digest->sig_size;
h->header_version_major = EC_PREAMBLE_HEADER_VERSION_MAJOR;
h->header_version_minor = EC_PREAMBLE_HEADER_VERSION_MINOR;
h->preamble_size = block_size;
h->firmware_version = firmware_version;
h->flags = flags;
if (name)
strncpy(h->name, name, sizeof(h->name));
/* Copy body hash */
SignatureInit(&h->body_digest, body_digest_dest,
body_digest->sig_size, 0);
SignatureCopy(&h->body_digest, body_digest);
/* Set up signature struct so we can calculate the signature */
SignatureInit(&h->preamble_signature, block_sig_dest,
siglen_map[signing_key->algorithm], signed_size);
/* Calculate signature */
sigtmp = CalculateSignature((uint8_t*)h, signed_size, signing_key);
SignatureCopy(&h->preamble_signature, sigtmp);
free(sigtmp);
/* Return the header */
return h;
}
VbFirmwarePreambleHeader* CreateFirmwarePreamble(
uint64_t firmware_version,
const VbPublicKey* kernel_subkey,
const VbSignature* body_signature,
const VbPrivateKey* signing_key,
uint32_t flags) {
VbFirmwarePreambleHeader* h;
uint64_t signed_size = (sizeof(VbFirmwarePreambleHeader) +
kernel_subkey->key_size +
body_signature->sig_size);
uint64_t block_size = signed_size + siglen_map[signing_key->algorithm];
uint8_t* kernel_subkey_dest;
uint8_t* body_sig_dest;
uint8_t* block_sig_dest;
VbSignature *sigtmp;
/* Allocate key block */
h = (VbFirmwarePreambleHeader*)malloc(block_size);
if (!h)
return NULL;
Memset(h, 0, block_size);
kernel_subkey_dest = (uint8_t*)(h + 1);
body_sig_dest = kernel_subkey_dest + kernel_subkey->key_size;
block_sig_dest = body_sig_dest + body_signature->sig_size;
h->header_version_major = FIRMWARE_PREAMBLE_HEADER_VERSION_MAJOR;
h->header_version_minor = FIRMWARE_PREAMBLE_HEADER_VERSION_MINOR;
h->preamble_size = block_size;
h->firmware_version = firmware_version;
h->flags = flags;
/* Copy data key */
PublicKeyInit(&h->kernel_subkey, kernel_subkey_dest,
kernel_subkey->key_size);
PublicKeyCopy(&h->kernel_subkey, kernel_subkey);
/* Copy body signature */
SignatureInit(&h->body_signature, body_sig_dest,
body_signature->sig_size, 0);
SignatureCopy(&h->body_signature, body_signature);
/* Set up signature struct so we can calculate the signature */
SignatureInit(&h->preamble_signature, block_sig_dest,
siglen_map[signing_key->algorithm], signed_size);
/* Calculate signature */
sigtmp = CalculateSignature((uint8_t*)h, signed_size, signing_key);
SignatureCopy(&h->preamble_signature, sigtmp);
free(sigtmp);
/* Return the header */
return h;
}
/* Creates a kernel preamble, signed with [signing_key].
* Caller owns the returned pointer, and must free it with free().
*
* Returns NULL if error. */
VbKernelPreambleHeader* CreateKernelPreamble(
uint64_t kernel_version,
uint64_t body_load_address,
uint64_t bootloader_address,
uint64_t bootloader_size,
const VbSignature* body_signature,
uint64_t desired_size,
const VbPrivateKey* signing_key) {
VbKernelPreambleHeader* h;
uint64_t signed_size = (sizeof(VbKernelPreambleHeader) +
body_signature->sig_size);
uint64_t block_size = signed_size + siglen_map[signing_key->algorithm];
uint8_t* body_sig_dest;
uint8_t* block_sig_dest;
VbSignature *sigtmp;
/* If the block size is smaller than the desired size, pad it */
if (block_size < desired_size)
block_size = desired_size;
/* Allocate key block */
h = (VbKernelPreambleHeader*)malloc(block_size);
Memset(h, 0, block_size);
if (!h)
return NULL;
body_sig_dest = (uint8_t*)(h + 1);
block_sig_dest = body_sig_dest + body_signature->sig_size;
h->header_version_major = KERNEL_PREAMBLE_HEADER_VERSION_MAJOR;
h->header_version_minor = KERNEL_PREAMBLE_HEADER_VERSION_MINOR;
h->preamble_size = block_size;
h->kernel_version = kernel_version;
h->body_load_address = body_load_address;
h->bootloader_address = bootloader_address;
h->bootloader_size = bootloader_size;
/* Copy body signature */
SignatureInit(&h->body_signature, body_sig_dest,
body_signature->sig_size, 0);
SignatureCopy(&h->body_signature, body_signature);
/* Set up signature struct so we can calculate the signature */
SignatureInit(&h->preamble_signature, block_sig_dest,
siglen_map[signing_key->algorithm], signed_size);
/* Calculate signature */
sigtmp = CalculateSignature((uint8_t*)h, signed_size, signing_key);
SignatureCopy(&h->preamble_signature, sigtmp);
free(sigtmp);
/* Return the header */
return h;
}
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