/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if !defined(AVB_INSIDE_LIBAVB_ATX_H) && !defined(AVB_COMPILATION)
#error \
"Never include this file directly, include libavb_atx/libavb_atx.h instead."
#endif
#ifndef AVB_ATX_VALIDATE_H_
#define AVB_ATX_VALIDATE_H_
#include "avb_atx_ops.h"
#include "avb_atx_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Rollback index locations for Android Things key versions. */
#define AVB_ATX_PIK_VERSION_LOCATION 0x1000
#define AVB_ATX_PSK_VERSION_LOCATION 0x1001
/* An implementation of validate_vbmeta_public_key for Android Things. See
* libavb/avb_ops.h for details on validate_vbmeta_public_key in general. This
* implementation uses the metadata expected with Android Things vbmeta images
* to perform validation on the public key. The ATX ops must be implemented.
* That is, |ops->atx_ops| must be valid.
*
* There are a multiple values that need verification:
* - Permanent Product Attributes: A hash of these attributes is fused into
* hardware. Consistency is checked.
* - Product Root Key (PRK): This key is provided in permanent attributes and
* is the root authority for all Android Things
* products.
* - Product Intermediate Key (PIK): This key is a rotated intermediary. It is
* certified by the PRK.
* - Product Signing Key (PSK): This key is a rotated authority for a specific
* Android Things product. It is certified by a
* PIK and must match |public_key_data|.
* - Product ID: This value is provided in permanent attributes and is unique
* to a specific Android Things product. This value must match
* the subject of the PSK certificate.
*/
AvbIOResult avb_atx_validate_vbmeta_public_key(
AvbOps* ops,
const uint8_t* public_key_data,
size_t public_key_length,
const uint8_t* public_key_metadata,
size_t public_key_metadata_length,
bool* out_is_trusted);
/* Generates a challenge which can be used to create an unlock credential. */
AvbIOResult avb_atx_generate_unlock_challenge(
AvbAtxOps* atx_ops, AvbAtxUnlockChallenge* out_unlock_challenge);
/* Validates an unlock credential. The certificate validation is very similar to
* the validation of public key metadata except in place of the PSK is a Product
* Unlock Key (PUK) and the certificate usage field identifies it as such. The
* challenge signature field is verified against this PUK.
*/
AvbIOResult avb_atx_validate_unlock_credential(
AvbAtxOps* atx_ops,
const AvbAtxUnlockCredential* unlock_credential,
bool* out_is_trusted);
#ifdef __cplusplus
}
#endif
#endif /* AVB_ATX_VALIDATE_H_ */