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182 lines
5.0 KiB
182 lines
5.0 KiB
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Vboot 2.0 data structures (compatible with vboot1)
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*
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* Note: Many of the structs have pairs of 32-bit fields and reserved fields.
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* This is to be backwards-compatible with older verified boot data which used
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* 64-bit fields (when we thought that hey, UEFI is 64-bit so all our fields
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* should be too).
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*
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* Offsets should be padded to 32-bit boundaries, since some architectures
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* have trouble with accessing unaligned integers.
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*/
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#ifndef VBOOT_REFERENCE_VB2_STRUCT_H_
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#define VBOOT_REFERENCE_VB2_STRUCT_H_
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#include <stdint.h>
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/* Packed public key data */
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struct vb2_packed_key {
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/* Offset of key data from start of this struct */
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uint32_t key_offset;
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uint32_t reserved0;
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/* Size of key data in bytes (NOT strength of key in bits) */
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uint32_t key_size;
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uint32_t reserved1;
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/* Signature algorithm used by the key (enum vb2_crypto_algorithm) */
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uint32_t algorithm;
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uint32_t reserved2;
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/* Key version */
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uint32_t key_version;
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uint32_t reserved3;
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/* TODO: when redoing this struct, add a text description of the key */
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} __attribute__((packed));
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#define EXPECTED_VB2_PACKED_KEY_SIZE 32
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/* Signature data (a secure hash, possibly signed) */
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struct vb2_signature {
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/* Offset of signature data from start of this struct */
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uint32_t sig_offset;
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uint32_t reserved0;
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/* Size of signature data in bytes */
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uint32_t sig_size;
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uint32_t reserved1;
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/* Size of the data block which was signed in bytes */
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uint32_t data_size;
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uint32_t reserved2;
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} __attribute__((packed));
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#define EXPECTED_VB2_SIGNATURE_SIZE 24
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#define KEY_BLOCK_MAGIC "CHROMEOS"
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#define KEY_BLOCK_MAGIC_SIZE 8
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#define KEY_BLOCK_HEADER_VERSION_MAJOR 2
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#define KEY_BLOCK_HEADER_VERSION_MINOR 1
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/*
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* Key block, containing the public key used to sign some other chunk of data.
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*
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* This should be followed by:
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* 1) The data_key key data, pointed to by data_key.key_offset.
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* 2) The checksum data for (vb2_keyblock + data_key data), pointed to
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* by keyblock_checksum.sig_offset.
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* 3) The signature data for (vb2_keyblock + data_key data), pointed to
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* by keyblock_signature.sig_offset.
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*/
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struct vb2_keyblock {
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/* Magic number */
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uint8_t magic[KEY_BLOCK_MAGIC_SIZE];
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/* Version of this header format */
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uint32_t header_version_major;
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/* Version of this header format */
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uint32_t header_version_minor;
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/*
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* Length of this entire key block, including keys, signatures, and
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* padding, in bytes
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*/
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uint32_t keyblock_size;
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uint32_t reserved0;
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/*
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* Signature for this key block (header + data pointed to by data_key)
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* For use with signed data keys
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*/
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struct vb2_signature keyblock_signature;
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/*
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* SHA-512 checksum for this key block (header + data pointed to by
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* data_key) For use with unsigned data keys.
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*
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* Note that the vb2 lib currently only supports signed blocks.
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*/
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struct vb2_signature keyblock_checksum_unused;
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/* Flags for key (VB2_KEY_BLOCK_FLAG_*) */
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uint32_t keyblock_flags;
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uint32_t reserved1;
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/* Key to verify the chunk of data */
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struct vb2_packed_key data_key;
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} __attribute__((packed));
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#define EXPECTED_VB2_KEYBLOCK_SIZE 112
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/* Firmware preamble header */
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#define FIRMWARE_PREAMBLE_HEADER_VERSION_MAJOR 2
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#define FIRMWARE_PREAMBLE_HEADER_VERSION_MINOR 1
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/* Flags for VbFirmwarePreambleHeader.flags */
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/* Reserved; do not use */
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#define VB2_FIRMWARE_PREAMBLE_RESERVED0 0x00000001
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/* Do not allow use of any hardware crypto accelerators. */
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#define VB2_FIRMWARE_PREAMBLE_DISALLOW_HWCRYPTO 0x00000002
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/* Premable block for rewritable firmware, vboot1 version 2.1.
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*
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* The firmware preamble header should be followed by:
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* 1) The kernel_subkey key data, pointed to by kernel_subkey.key_offset.
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* 2) The signature data for the firmware body, pointed to by
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* body_signature.sig_offset.
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* 3) The signature data for (header + kernel_subkey data + body signature
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* data), pointed to by preamble_signature.sig_offset.
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*/
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struct vb2_fw_preamble {
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/*
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* Size of this preamble, including keys, signatures, and padding, in
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* bytes
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*/
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uint32_t preamble_size;
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uint32_t reserved0;
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/*
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* Signature for this preamble (header + kernel subkey + body
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* signature)
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*/
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struct vb2_signature preamble_signature;
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/* Version of this header format */
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uint32_t header_version_major;
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uint32_t header_version_minor;
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/* Firmware version */
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uint32_t firmware_version;
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uint32_t reserved1;
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/* Key to verify kernel key block */
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struct vb2_packed_key kernel_subkey;
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/* Signature for the firmware body */
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struct vb2_signature body_signature;
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/*
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* Fields added in header version 2.1. You must verify the header
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* version before reading these fields!
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*/
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/*
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* Flags; see VB2_FIRMWARE_PREAMBLE_*. Readers should return 0 for
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* header version < 2.1.
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*/
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uint32_t flags;
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} __attribute__((packed));
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#define EXPECTED_VB2_FW_PREAMBLE_SIZE 108
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#endif /* VBOOT_REFERENCE_VB2_STRUCT_H_ */
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