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97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_EC_PRIVATE_KEY_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_EC_PRIVATE_KEY_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include "absl/types/span.h"
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#include "internal/crypto/crypto_export.h"
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#include <openssl/base.h>
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namespace crypto {
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// Encapsulates an elliptic curve (EC) private key. Can be used to generate new
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// keys, export keys to other formats, or to extract a public key.
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// TODO(mattm): make this and RSAPrivateKey implement some PrivateKey interface.
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// (The difference in types of key() and public_key() make this a little
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// tricky.)
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class CRYPTO_EXPORT ECPrivateKey {
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public:
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ECPrivateKey(const ECPrivateKey&) = delete;
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ECPrivateKey& operator=(const ECPrivateKey&) = delete;
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~ECPrivateKey();
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// Creates a new random instance. Can return nullptr if initialization fails.
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// The created key will use the NIST P-256 curve.
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// TODO(mattm): Add a curve parameter.
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static std::unique_ptr<ECPrivateKey> Create();
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// Create a new instance by importing an existing private key. The format is
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// an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return
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// nullptr if initialization fails.
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static std::unique_ptr<ECPrivateKey> CreateFromPrivateKeyInfo(
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absl::Span<const uint8_t> input);
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// Creates a new instance by importing an existing key pair.
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// The key pair is given as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
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// block with empty password and an X.509 SubjectPublicKeyInfo block.
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// Returns nullptr if initialization fails.
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//
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// This function is deprecated. Use CreateFromPrivateKeyInfo for new code.
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// See https://crbug.com/603319.
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static std::unique_ptr<ECPrivateKey> CreateFromEncryptedPrivateKeyInfo(
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absl::Span<const uint8_t> encrypted_private_key_info);
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// Returns a copy of the object.
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std::unique_ptr<ECPrivateKey> Copy() const;
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EVP_PKEY* key() { return key_.get(); }
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// Exports the private key to a PKCS #8 PrivateKeyInfo block.
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bool ExportPrivateKey(std::vector<uint8_t>* output) const;
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// Exports the private key as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
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// block wth empty password. This was historically used as a workaround for
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// NSS API deficiencies and does not provide security.
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//
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// This function is deprecated. Use ExportPrivateKey for new code. See
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// https://crbug.com/603319.
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bool ExportEncryptedPrivateKey(std::vector<uint8_t>* output) const;
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// Exports the public key to an X.509 SubjectPublicKeyInfo block.
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bool ExportPublicKey(std::vector<uint8_t>* output) const;
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// Exports the public key as an EC point in X9.62 uncompressed form. Note this
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// includes the leading 0x04 byte.
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bool ExportRawPublicKey(std::string* output) const;
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private:
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// Constructor is private. Use one of the Create*() methods above instead.
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ECPrivateKey();
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bssl::UniquePtr<EVP_PKEY> key_;
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};
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} // namespace crypto
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#endif // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_EC_PRIVATE_KEY_H_
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