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73 lines
2.8 KiB
Objective-C
73 lines
2.8 KiB
Objective-C
// Copyright 2024 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_UNEXPORTABLE_KEY_MAC_H_
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#define CRYPTO_UNEXPORTABLE_KEY_MAC_H_
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#include <memory>
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#if defined(__OBJC__)
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#import <LocalAuthentication/LocalAuthentication.h>
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#endif // defined(__OBJC__)
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#include "crypto/unexportable_key.h"
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namespace crypto {
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// UserVerifyingKeyProviderMac is an implementation of the
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// UserVerifyingKeyProvider interface on top of Apple's Secure Enclave. Callers
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// must provide a keychain access group when instantiating this class. This
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// means that the build must be codesigned for any of this to work.
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// https://developer.apple.com/documentation/bundleresources/entitlements/keychain-access-groups?language=objc
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//
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// Only NIST P-256 elliptic curves are supported.
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//
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// Unlike Windows keys, macOS will store key metadata locally. Callers are
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// responsible for deleting keys when they are no longer needed.
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class UnexportableKeyProviderMac : public UnexportableKeyProvider {
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public:
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explicit UnexportableKeyProviderMac(Config config);
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~UnexportableKeyProviderMac() override;
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#if defined(__OBJC__)
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// Like UnexportableKeyProvider::FromWrappedSigningKeySlowly, but lets you
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// pass an authenticated LAContext to avoid having macOS prompt the user for
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// user verification.
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std::unique_ptr<UnexportableSigningKey> FromWrappedSigningKeySlowly(
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base::span<const uint8_t> wrapped_key,
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LAContext* lacontext);
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// Like UnexportableKeyProvider::GenerateSigningKeySlowly, but lets you pass
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// an authenticated LAContext to avoid having macOS prompt the user for user
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// verification.
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std::unique_ptr<UnexportableSigningKey> GenerateSigningKeySlowly(
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base::span<const SignatureVerifier::SignatureAlgorithm>
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acceptable_algorithms,
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LAContext* lacontext);
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#endif // defined(__OBJC__)
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// UnexportableKeyProvider:
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std::optional<SignatureVerifier::SignatureAlgorithm> SelectAlgorithm(
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base::span<const SignatureVerifier::SignatureAlgorithm>
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acceptable_algorithms) override;
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std::unique_ptr<UnexportableSigningKey> GenerateSigningKeySlowly(
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base::span<const SignatureVerifier::SignatureAlgorithm>
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acceptable_algorithms) override;
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std::unique_ptr<UnexportableSigningKey> FromWrappedSigningKeySlowly(
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base::span<const uint8_t> wrapped_key) override;
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bool DeleteSigningKeySlowly(base::span<const uint8_t> wrapped_key) override;
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private:
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struct ObjCStorage;
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const Config::AccessControl access_control_;
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std::unique_ptr<ObjCStorage> objc_storage_;
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};
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std::unique_ptr<UnexportableKeyProviderMac> GetUnexportableKeyProviderMac(
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UnexportableKeyProvider::Config config);
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} // namespace crypto
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#endif // CRYPTO_UNEXPORTABLE_KEY_MAC_H_
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