1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/ip_protection/common/probabilistic_reveal_token_test_consumer.h"
#include <cstddef>
#include <optional>
#include <string>
#include "components/ip_protection/common/ip_protection_data_types.h"
#include "third_party/boringssl/src/include/openssl/base.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
namespace ip_protection {
namespace {
// Size of a PRT when TLS serialized, before base64 encoding.
constexpr size_t kPRTSize = 79;
constexpr size_t kPRTPointSize = 33;
constexpr size_t kEpochIdSize = 8;
} // namespace
std::optional<ProbabilisticRevealTokenTestConsumer>
ProbabilisticRevealTokenTestConsumer::MaybeCreate(
const std::string& serialized_prt) {
CBS cbs;
CBS_init(&cbs, reinterpret_cast<const uint8_t*>(serialized_prt.data()),
serialized_prt.size());
if (CBS_len(&cbs) != kPRTSize) {
return std::nullopt;
}
uint8_t version;
uint16_t u_size;
uint16_t e_size;
std::string u(kPRTPointSize, '0');
std::string e(kPRTPointSize, '0');
std::string epoch_id(kEpochIdSize, '0');
if (!CBS_get_u8(&cbs, &version) || !CBS_get_u16(&cbs, &u_size) ||
u_size != kPRTPointSize ||
!CBS_copy_bytes(&cbs, reinterpret_cast<uint8_t*>(u.data()), u_size) ||
!CBS_get_u16(&cbs, &e_size) || e_size != kPRTPointSize ||
!CBS_copy_bytes(&cbs, reinterpret_cast<uint8_t*>(e.data()), e_size) ||
!CBS_copy_bytes(&cbs, reinterpret_cast<uint8_t*>(epoch_id.data()),
kEpochIdSize)) {
return std::nullopt;
}
ProbabilisticRevealToken token(version, std::move(u), std::move(e));
return ProbabilisticRevealTokenTestConsumer(std::move(token),
std::move(epoch_id));
}
ProbabilisticRevealTokenTestConsumer::ProbabilisticRevealTokenTestConsumer(
ProbabilisticRevealToken token,
std::string epoch_id)
: token_(std::move(token)), epoch_id_(std::move(epoch_id)) {}
} // namespace ip_protection
|
