void avb_sha512_update(AvbSHA512Ctx* ctx, const uint8_t* data, uint32_t len) {
unsigned int block_nb;
unsigned int new_len, rem_len, tmp_len;
const uint8_t* shifted_data;
tmp_len = AVB_SHA512_BLOCK_SIZE - ctx->len;
rem_len = len < tmp_len ? len : tmp_len;
avb_memcpy(&ctx->block[ctx->len], data, rem_len);
if (ctx->len + len < AVB_SHA512_BLOCK_SIZE) {
ctx->len += len;
return;
}
new_len = len - rem_len;
block_nb = new_len / AVB_SHA512_BLOCK_SIZE;
shifted_data = data + rem_len;
SHA512_transform(ctx, ctx->block, 1);
SHA512_transform(ctx, shifted_data, block_nb);
rem_len = new_len % AVB_SHA512_BLOCK_SIZE;
avb_memcpy(ctx->block, &shifted_data[block_nb << 7], rem_len);
ctx->len = rem_len;
ctx->tot_len += (block_nb + 1) << 7;
}
static int cmdline_append_option(AvbSlotVerifyData* slot_data,
const char* key,
const char* value) {
size_t offset, key_len, value_len;
char* new_cmdline;
key_len = avb_strlen(key);
value_len = avb_strlen(value);
offset = 0;
if (slot_data->cmdline != NULL) {
offset = avb_strlen(slot_data->cmdline);
if (offset > 0) {
offset += 1;
}
}
new_cmdline = avb_calloc(offset + key_len + value_len + 2);
if (new_cmdline == NULL) {
return 0;
}
if (offset > 0) {
avb_memcpy(new_cmdline, slot_data->cmdline, offset - 1);
new_cmdline[offset - 1] = ' ';
}
avb_memcpy(new_cmdline + offset, key, key_len);
new_cmdline[offset + key_len] = '=';
avb_memcpy(new_cmdline + offset + key_len + 1, value, value_len);
if (slot_data->cmdline != NULL) {
avb_free(slot_data->cmdline);
}
slot_data->cmdline = new_cmdline;
return 1;
}
bool avb_property_descriptor_validate_and_byteswap(
const AvbPropertyDescriptor* src, AvbPropertyDescriptor* dest) {
uint64_t expected_size;
avb_memcpy(dest, src, sizeof(AvbPropertyDescriptor));
if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
(AvbDescriptor*)dest))
return false;
if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_PROPERTY) {
avb_error("Invalid tag for property descriptor.\n");
return false;
}
dest->key_num_bytes = avb_be64toh(dest->key_num_bytes);
dest->value_num_bytes = avb_be64toh(dest->value_num_bytes);
/* Check that key and value are fully contained. */
expected_size = sizeof(AvbPropertyDescriptor) - sizeof(AvbDescriptor) + 2;
if (!avb_safe_add_to(&expected_size, dest->key_num_bytes) ||
!avb_safe_add_to(&expected_size, dest->value_num_bytes)) {
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;
}
static int cmdline_append_version(AvbSlotVerifyData* slot_data,
const char* key,
uint64_t major_version,
uint64_t minor_version) {
char major_digits[AVB_MAX_DIGITS_UINT64];
char minor_digits[AVB_MAX_DIGITS_UINT64];
char combined[AVB_MAX_DIGITS_UINT64 * 2 + 1];
size_t num_major_digits, num_minor_digits;
num_major_digits = uint64_to_base10(major_version, major_digits);
num_minor_digits = uint64_to_base10(minor_version, minor_digits);
avb_memcpy(combined, major_digits, num_major_digits);
combined[num_major_digits] = '.';
avb_memcpy(combined + num_major_digits + 1, minor_digits, num_minor_digits);
combined[num_major_digits + 1 + num_minor_digits] = '\0';
return cmdline_append_option(slot_data, key, combined);
}
