1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/cert/jwk_serializer.h"
6
7#include "base/base64.h"
8#include "base/values.h"
9#include "testing/gtest/include/gtest/gtest.h"
10
11namespace net {
12
13// This is the ASN.1 prefix for a P-256 public key. Specifically it's:
14// SEQUENCE
15//   SEQUENCE
16//     OID id-ecPublicKey
17//     OID prime256v1
18//   BIT STRING, length 66, 0 trailing bits: 0x04
19//
20// The 0x04 in the BIT STRING is the prefix for an uncompressed, X9.62
21// public key. Following that are the two field elements as 32-byte,
22// big-endian numbers, as required by the Channel ID.
23static const unsigned char kP256SpkiPrefix[] = {
24    0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
25    0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
26    0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
27    0x42, 0x00, 0x04
28};
29static const unsigned int kEcCoordinateSize = 32U;
30
31// This is a valid P-256 public key.
32static const unsigned char kSpkiEc[] = {
33    0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
34    0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
35    0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
36    0x42, 0x00, 0x04,
37    0x29, 0x5d, 0x6e, 0xfe, 0x33, 0x77, 0x26, 0xea,
38    0x5b, 0xa4, 0xe6, 0x1b, 0x34, 0x6e, 0x7b, 0xa0,
39    0xa3, 0x8f, 0x33, 0x49, 0xa0, 0x9c, 0xae, 0x98,
40    0xbd, 0x46, 0x0d, 0xf6, 0xd4, 0x5a, 0xdc, 0x8a,
41    0x1f, 0x8a, 0xb2, 0x20, 0x51, 0xb7, 0xd2, 0x87,
42    0x0d, 0x53, 0x7e, 0x5d, 0x94, 0xa3, 0xe0, 0x34,
43    0x16, 0xa1, 0xcc, 0x10, 0x48, 0xcd, 0x70, 0x9c,
44    0x05, 0xd3, 0xd2, 0xca, 0xdf, 0x44, 0x2f, 0xf4
45};
46
47// This is a P-256 public key with a leading 0.
48static const unsigned char kSpkiEcWithLeadingZero[] = {
49    0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
50    0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
51    0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
52    0x42, 0x00, 0x04,
53    0x00, 0x8e, 0xd5, 0x49, 0x51, 0xad, 0x7d, 0xd3,
54    0x3a, 0x59, 0x86, 0xd1, 0x2c, 0xba, 0x05, 0xd3,
55    0xa6, 0x3c, 0x5d, 0x6d, 0x28, 0xde, 0x8f, 0xdd,
56    0xa5, 0x3d, 0x30, 0x18, 0x05, 0x86, 0x76, 0x9c,
57    0x7c, 0xa7, 0xba, 0x58, 0xea, 0x1a, 0x84, 0x19,
58    0x29, 0x0a, 0x15, 0x30, 0x7d, 0x6b, 0x00, 0x41,
59    0x64, 0x56, 0x84, 0x19, 0x54, 0x3e, 0x26, 0x13,
60    0xc9, 0x1e, 0x31, 0x89, 0xe2, 0x62, 0xcb, 0x3f
61};
62
63TEST(JwkSerializerTest, ConvertSpkiFromDerToJwkEc) {
64  base::StringPiece spki;
65  base::DictionaryValue public_key_jwk;
66
67  EXPECT_FALSE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
68  EXPECT_TRUE(public_key_jwk.empty());
69
70  // Test the result of a "normal" point on this curve.
71  spki.set(reinterpret_cast<const char*>(kSpkiEc), sizeof(kSpkiEc));
72  EXPECT_TRUE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
73
74  std::string string_value;
75  EXPECT_TRUE(public_key_jwk.GetString("kty", &string_value));
76  EXPECT_STREQ("EC", string_value.c_str());
77  EXPECT_TRUE(public_key_jwk.GetString("crv", &string_value));
78  EXPECT_STREQ("P-256", string_value.c_str());
79
80  EXPECT_TRUE(public_key_jwk.GetString("x", &string_value));
81  std::string decoded_coordinate;
82  EXPECT_TRUE(base::Base64Decode(string_value, &decoded_coordinate));
83  EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
84  EXPECT_EQ(0,
85            memcmp(decoded_coordinate.data(),
86                   kSpkiEc + sizeof(kP256SpkiPrefix),
87                   kEcCoordinateSize));
88
89  EXPECT_TRUE(public_key_jwk.GetString("y", &string_value));
90  EXPECT_TRUE(base::Base64Decode(string_value, &decoded_coordinate));
91  EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
92  EXPECT_EQ(0,
93            memcmp(decoded_coordinate.data(),
94                  kSpkiEc + sizeof(kP256SpkiPrefix) + kEcCoordinateSize,
95                  kEcCoordinateSize));
96
97  // Test the result of a corner case: leading 0s in the x, y coordinates are
98  // not trimmed, but the point is fixed-length encoded.
99  spki.set(reinterpret_cast<const char*>(kSpkiEcWithLeadingZero),
100           sizeof(kSpkiEcWithLeadingZero));
101  EXPECT_TRUE(JwkSerializer::ConvertSpkiFromDerToJwk(spki, &public_key_jwk));
102
103  EXPECT_TRUE(public_key_jwk.GetString("kty", &string_value));
104  EXPECT_STREQ("EC", string_value.c_str());
105  EXPECT_TRUE(public_key_jwk.GetString("crv", &string_value));
106  EXPECT_STREQ("P-256", string_value.c_str());
107
108  EXPECT_TRUE(public_key_jwk.GetString("x", &string_value));
109  EXPECT_TRUE(base::Base64Decode(string_value, &decoded_coordinate));
110  EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
111  EXPECT_EQ(0,
112            memcmp(decoded_coordinate.data(),
113                   kSpkiEcWithLeadingZero + sizeof(kP256SpkiPrefix),
114                   kEcCoordinateSize));
115
116  EXPECT_TRUE(public_key_jwk.GetString("y", &string_value));
117  EXPECT_TRUE(base::Base64Decode(string_value, &decoded_coordinate));
118  EXPECT_EQ(kEcCoordinateSize, decoded_coordinate.size());
119  EXPECT_EQ(0, memcmp(
120      decoded_coordinate.data(),
121      kSpkiEcWithLeadingZero + sizeof(kP256SpkiPrefix) + kEcCoordinateSize,
122      kEcCoordinateSize));
123}
124
125}  // namespace net
126