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// 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/payments/content/browser_binding/browser_bound_key_store_desktop.h"
#include "components/payments/content/browser_binding/browser_bound_key.h"
#include "components/payments/content/browser_binding/browser_bound_key_desktop.h"
#include "crypto/signature_verifier.h"
#include "crypto/unexportable_key.h"
#include "device/fido/public_key_credential_params.h"
namespace {
#if BUILDFLAG(IS_MAC)
constexpr char kApplicationTag[] = "secure-payment-confirmation";
#endif // BUILDFLAG(IS_MAC)
} // namespace
namespace payments {
scoped_refptr<BrowserBoundKeyStore> GetBrowserBoundKeyStoreInstance(
BrowserBoundKeyStore::Config config) {
std::unique_ptr<crypto::UnexportableKeyProvider> key_provider =
crypto::GetUnexportableKeyProvider(
crypto::UnexportableKeyProvider::Config{
#if BUILDFLAG(IS_MAC)
.keychain_access_group = config.keychain_access_group,
.application_tag = kApplicationTag,
.access_control =
crypto::UnexportableKeyProvider::Config::AccessControl::kNone,
#endif // BUILDFLAG(IS_MAC)
});
return base::MakeRefCounted<BrowserBoundKeyStoreDesktop>(
std::move(key_provider));
}
BrowserBoundKeyStoreDesktop::BrowserBoundKeyStoreDesktop(
std::unique_ptr<crypto::UnexportableKeyProvider> key_provider)
: key_provider_(std::move(key_provider)) {}
std::unique_ptr<BrowserBoundKey>
BrowserBoundKeyStoreDesktop::GetOrCreateBrowserBoundKeyForCredentialId(
const std::vector<uint8_t>& credential_id,
const std::vector<device::PublicKeyCredentialParams::CredentialInfo>&
allowed_credentials) {
if (!key_provider_) {
return nullptr;
}
std::unique_ptr<crypto::UnexportableSigningKey> key =
key_provider_->FromWrappedSigningKeySlowly(credential_id);
if (key) {
return std::make_unique<BrowserBoundKeyDesktop>(std::move(key));
}
// No existing key, create a new one.
std::vector<crypto::SignatureVerifier::SignatureAlgorithm> algorithms;
algorithms.reserve(allowed_credentials.size());
for (const auto& credential : allowed_credentials) {
switch (
static_cast<device::CoseAlgorithmIdentifier>(credential.algorithm)) {
case device::CoseAlgorithmIdentifier::kRs256:
algorithms.push_back(
crypto::SignatureVerifier::SignatureAlgorithm::RSA_PKCS1_SHA256);
break;
case device::CoseAlgorithmIdentifier::kEs256:
algorithms.push_back(
crypto::SignatureVerifier::SignatureAlgorithm::ECDSA_SHA256);
break;
default: // Unsupported algorithms.
break;
}
}
key = key_provider_->GenerateSigningKeySlowly(algorithms);
return std::make_unique<BrowserBoundKeyDesktop>(std::move(key));
}
void BrowserBoundKeyStoreDesktop::DeleteBrowserBoundKey(
std::vector<uint8_t> bbk_id) {
if (key_provider_) {
key_provider_->DeleteSigningKeySlowly(bbk_id);
}
}
bool BrowserBoundKeyStoreDesktop::GetDeviceSupportsHardwareKeys() {
#if BUILDFLAG(IS_MAC)
return key_provider_ != nullptr;
#elif BUILDFLAG(IS_WIN)
if (!key_provider_) {
return false;
}
// On Windows, the existence of a key provider does not guarantee that
// hardware-backed keys are supported. Check if we can create a key with
// either of the two algorithms we support.
return key_provider_->SelectAlgorithm(
{crypto::SignatureVerifier::SignatureAlgorithm::ECDSA_SHA256,
crypto::SignatureVerifier::SignatureAlgorithm::
RSA_PKCS1_SHA256}) != std::nullopt;
#else // !BUILDFLAG(IS_MAC) && !BUILDFLAG(IS_WIN)
// Hardware based browser bound keys are not supported on Linux or ChromeOS.
return false;
#endif
}
BrowserBoundKeyStoreDesktop::~BrowserBoundKeyStoreDesktop() = default;
} // namespace payments
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