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
|
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/webcrypto/algorithms/asymmetric_key_util.h"
#include <stdint.h>
#include <utility>
#include "components/webcrypto/algorithms/util.h"
#include "components/webcrypto/blink_key_handle.h"
#include "components/webcrypto/status.h"
#include "crypto/openssl_util.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
namespace webcrypto {
// Exports an EVP_PKEY public key to the SPKI format.
Status ExportPKeySpki(EVP_PKEY* key, std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) || !EVP_marshal_public_key(cbb.get(), key) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Status::ErrorUnexpected();
}
buffer->assign(der, der + der_len);
OPENSSL_free(der);
return Status::Success();
}
// Exports an EVP_PKEY private key to the PKCS8 format.
Status ExportPKeyPkcs8(EVP_PKEY* key, std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
// TODO(eroman): Use the OID specified by webcrypto spec.
// http://crbug.com/373545
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) || !EVP_marshal_private_key(cbb.get(), key) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Status::ErrorUnexpected();
}
buffer->assign(der, der + der_len);
OPENSSL_free(der);
return Status::Success();
}
Status CreateWebCryptoPublicKey(bssl::UniquePtr<EVP_PKEY> public_key,
const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) {
*key = blink::WebCryptoKey::Create(
CreateAsymmetricKeyHandle(std::move(public_key)),
blink::kWebCryptoKeyTypePublic, extractable, algorithm, usages);
return Status::Success();
}
Status CreateWebCryptoPrivateKey(bssl::UniquePtr<EVP_PKEY> private_key,
const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) {
*key = blink::WebCryptoKey::Create(
CreateAsymmetricKeyHandle(std::move(private_key)),
blink::kWebCryptoKeyTypePrivate, extractable, algorithm, usages);
return Status::Success();
}
Status ImportUnverifiedPkeyFromSpki(base::span<const uint8_t> key_data,
int expected_pkey_id,
bssl::UniquePtr<EVP_PKEY>* out_pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs;
CBS_init(&cbs, key_data.data(), key_data.size());
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_public_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0)
return Status::DataError();
if (EVP_PKEY_id(pkey.get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
*out_pkey = std::move(pkey);
return Status::Success();
}
Status ImportUnverifiedPkeyFromPkcs8(base::span<const uint8_t> key_data,
int expected_pkey_id,
bssl::UniquePtr<EVP_PKEY>* out_pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs;
CBS_init(&cbs, key_data.data(), key_data.size());
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_private_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0)
return Status::DataError();
if (EVP_PKEY_id(pkey.get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
*out_pkey = std::move(pkey);
return Status::Success();
}
Status GetUsagesForGenerateAsymmetricKey(
blink::WebCryptoKeyUsageMask combined_usages,
blink::WebCryptoKeyUsageMask all_public_usages,
blink::WebCryptoKeyUsageMask all_private_usages,
blink::WebCryptoKeyUsageMask* public_usages,
blink::WebCryptoKeyUsageMask* private_usages) {
// Ensure that the combined usages is a subset of the total possible usages.
Status status = CheckKeyCreationUsages(all_public_usages | all_private_usages,
combined_usages);
if (status.IsError())
return status;
*public_usages = combined_usages & all_public_usages;
*private_usages = combined_usages & all_private_usages;
// NOTE: empty private_usages is allowed at this layer. Such keys will be
// rejected at a higher layer.
return Status::Success();
}
} // namespace webcrypto
|
