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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/webid/jwt_signer.h"
#include "base/base64.h"
#include "base/base64url.h"
#include "base/compiler_specific.h"
#include "base/containers/span.h"
#include "base/containers/to_vector.h"
#include "base/functional/callback.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/values.h"
#include "content/browser/webid/sd_jwt.h"
#include "crypto/ec_private_key.h"
#include "crypto/ec_signature_creator.h"
#include "crypto/random.h"
#include "crypto/sha2.h"
#include "crypto/signature_verifier.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/boringssl/src/include/openssl/bn.h"
#include "third_party/boringssl/src/include/openssl/ecdsa.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
#include "url/gurl.h"
#include "url/origin.h"
using ::testing::NiceMock;
namespace content::sdjwt {
namespace {
std::vector<uint8_t> TestSha256(std::string_view data) {
std::string str = crypto::SHA256HashString(data);
std::vector<uint8_t> result(str.begin(), str.end());
return result;
}
} // namespace
class JwtSignerTest : public testing::Test {
protected:
JwtSignerTest() = default;
~JwtSignerTest() override = default;
void SetUp() override {}
void TearDown() override {}
};
void Verify(const std::vector<uint8_t>& public_key,
const base::span<const uint8_t>& signature,
const std::string& message) {
const size_t kMaxBytesPerBN = 32;
EXPECT_EQ(signature.size(), 2 * kMaxBytesPerBN);
base::span<const uint8_t> r_bytes = signature.first(kMaxBytesPerBN);
base::span<const uint8_t> s_bytes = signature.subspan(kMaxBytesPerBN);
bssl::UniquePtr<ECDSA_SIG> ecdsa_sig(ECDSA_SIG_new());
EXPECT_TRUE(ecdsa_sig);
EXPECT_TRUE(BN_bin2bn(r_bytes.data(), r_bytes.size(), ecdsa_sig->r));
EXPECT_TRUE(BN_bin2bn(s_bytes.data(), s_bytes.size(), ecdsa_sig->s));
uint8_t* der;
size_t der_len;
EXPECT_TRUE(ECDSA_SIG_to_bytes(&der, &der_len, ecdsa_sig.get()));
// Frees memory allocated by `ECDSA_SIG_to_bytes()`.
bssl::UniquePtr<uint8_t> delete_signature(der);
// SAFETY: `ECDSA_SIG_to_bytes()` uses a C-style API to allocate a new buffer.
auto signature_span = UNSAFE_BUFFERS(base::span<uint8_t>(der, der_len));
auto der_signature = base::ToVector(signature_span);
crypto::SignatureVerifier verifier;
EXPECT_TRUE(verifier.VerifyInit(crypto::SignatureVerifier::ECDSA_SHA256,
der_signature, public_key));
verifier.VerifyUpdate(base::as_byte_span(message));
EXPECT_TRUE(verifier.VerifyFinal());
}
TEST_F(JwtSignerTest, JwtSigner) {
auto private_key = crypto::ECPrivateKey::Create();
std::vector<uint8_t> public_key;
EXPECT_TRUE(private_key->ExportPublicKey(&public_key));
const std::string message = "hello wold";
auto signer = CreateJwtSigner(std::move(private_key));
auto signature = std::move(signer).Run(message);
Verify(public_key, base::as_byte_span(*signature), message);
}
TEST_F(JwtSignerTest, CreateJwt) {
auto private_key = crypto::ECPrivateKey::Create();
EXPECT_TRUE(private_key);
std::vector<uint8_t> public_key;
EXPECT_TRUE(private_key->ExportPublicKey(&public_key));
Header header;
header.typ = "jwt";
header.alg = "ES256";
Payload payload;
payload.iss = "https://issuer.example";
payload.sub = "goto@google.com";
Jwt issued;
issued.header = JSONString(header.Serialize()->value());
issued.payload = JSONString(payload.Serialize()->value());
auto success = issued.Sign(CreateJwtSigner(std::move(private_key)));
EXPECT_TRUE(success);
auto signature = base::Base64UrlDecode(
issued.signature.value(), base::Base64UrlDecodePolicy::IGNORE_PADDING);
EXPECT_TRUE(signature);
std::string header_base64;
base::Base64UrlEncode(issued.header.value(),
base::Base64UrlEncodePolicy::OMIT_PADDING,
&header_base64);
std::string payload_base64;
base::Base64UrlEncode(issued.payload.value(),
base::Base64UrlEncodePolicy::OMIT_PADDING,
&payload_base64);
std::string message = header_base64 + "." + payload_base64;
Verify(public_key, base::as_byte_span(*signature), message);
}
TEST_F(JwtSignerTest, CreateSdJwtKb) {
auto holder_private_key = crypto::ECPrivateKey::Create();
auto jwk = ExportPublicKey(*holder_private_key);
auto issuer_private_key = crypto::ECPrivateKey::Create();
Header header;
header.typ = "jwt";
header.alg = "ES256";
Payload payload;
payload.iss = "https://issuer.example";
Disclosure name;
name.salt = Disclosure::CreateSalt();
name.name = "name";
name.value = "Sam";
payload._sd = {*name.Digest(base::BindRepeating(TestSha256))};
ConfirmationKey confirmation;
confirmation.jwk = *jwk;
payload.cnf = confirmation;
auto issuer_json = ExportPublicKey(*issuer_private_key);
EXPECT_TRUE(issuer_json);
EXPECT_TRUE(issuer_json->Serialize());
Jwt issued;
issued.header = JSONString(header.Serialize()->value());
issued.payload = JSONString(payload.Serialize()->value());
auto signer = CreateJwtSigner(std::move(issuer_private_key));
auto success = issued.Sign(std::move(signer));
EXPECT_TRUE(success);
auto presentation = SdJwt::Disclose(
{{name.name, JSONString(name.Serialize().value())}}, {"name"});
EXPECT_TRUE(presentation);
SdJwt sd_jwt;
sd_jwt.jwt = issued;
sd_jwt.disclosures = *presentation;
std::optional<SdJwtKb> sd_jwt_kb = SdJwtKb::Create(
sd_jwt, "https://verifier.example", "__fake_nonce__",
base::Time::FromTimeT(1234), base::BindRepeating(TestSha256),
CreateJwtSigner(std::move(holder_private_key)));
EXPECT_TRUE(sd_jwt_kb);
}
} // namespace content::sdjwt
|
