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- // SPDX-License-Identifier: MIT
- /*
- * Copyright (C) 2016 The Android Open Source Project
- */
- #include "avb_hash_descriptor.h"
- #include "avb_util.h"
- bool avb_hash_descriptor_validate_and_byteswap(const AvbHashDescriptor* src,
- AvbHashDescriptor* dest) {
- uint64_t expected_size;
- avb_memcpy(dest, src, sizeof(AvbHashDescriptor));
- if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
- (AvbDescriptor*)dest))
- return false;
- if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_HASH) {
- avb_error("Invalid tag for hash descriptor.\n");
- return false;
- }
- dest->image_size = avb_be64toh(dest->image_size);
- dest->partition_name_len = avb_be32toh(dest->partition_name_len);
- dest->salt_len = avb_be32toh(dest->salt_len);
- dest->digest_len = avb_be32toh(dest->digest_len);
- dest->flags = avb_be32toh(dest->flags);
- /* Check that partition_name, salt, and digest are fully contained. */
- expected_size = sizeof(AvbHashDescriptor) - sizeof(AvbDescriptor);
- if (!avb_safe_add_to(&expected_size, dest->partition_name_len) ||
- !avb_safe_add_to(&expected_size, dest->salt_len) ||
- !avb_safe_add_to(&expected_size, dest->digest_len)) {
- avb_error("Overflow while adding up sizes.\n");
- return false;
- }
- if (expected_size > dest->parent_descriptor.num_bytes_following) {
- avb_error("Descriptor payload size overflow.\n");
- return false;
- }
- return true;
- }
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