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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef CRYPTO_EC_PRIVATE_KEY_H_
- #define CRYPTO_EC_PRIVATE_KEY_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include <string>
- #include <vector>
- #include "base/containers/span.h"
- #include "build/build_config.h"
- #include "crypto/crypto_export.h"
- #include "third_party/boringssl/src/include/openssl/base.h"
- namespace crypto {
- // Encapsulates an elliptic curve (EC) private key. Can be used to generate new
- // keys, export keys to other formats, or to extract a public key.
- // TODO(mattm): make this and RSAPrivateKey implement some PrivateKey interface.
- // (The difference in types of key() and public_key() make this a little
- // tricky.)
- class CRYPTO_EXPORT ECPrivateKey {
- public:
- ECPrivateKey(const ECPrivateKey&) = delete;
- ECPrivateKey& operator=(const ECPrivateKey&) = delete;
- ~ECPrivateKey();
- // Creates a new random instance. Can return nullptr if initialization fails.
- // The created key will use the NIST P-256 curve.
- // TODO(mattm): Add a curve parameter.
- static std::unique_ptr<ECPrivateKey> Create();
- // Create a new instance by importing an existing private key. The format is
- // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return
- // nullptr if initialization fails.
- static std::unique_ptr<ECPrivateKey> CreateFromPrivateKeyInfo(
- base::span<const uint8_t> input);
- // Creates a new instance by importing an existing key pair.
- // The key pair is given as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
- // block with empty password and an X.509 SubjectPublicKeyInfo block.
- // Returns nullptr if initialization fails.
- //
- // This function is deprecated. Use CreateFromPrivateKeyInfo for new code.
- // See https://crbug.com/603319.
- static std::unique_ptr<ECPrivateKey> CreateFromEncryptedPrivateKeyInfo(
- base::span<const uint8_t> encrypted_private_key_info);
- // Returns a copy of the object.
- std::unique_ptr<ECPrivateKey> Copy() const;
- EVP_PKEY* key() { return key_.get(); }
- // Exports the private key to a PKCS #8 PrivateKeyInfo block.
- bool ExportPrivateKey(std::vector<uint8_t>* output) const;
- // Exports the private key as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
- // block wth empty password. This was historically used as a workaround for
- // NSS API deficiencies and does not provide security.
- //
- // This function is deprecated. Use ExportPrivateKey for new code. See
- // https://crbug.com/603319.
- bool ExportEncryptedPrivateKey(std::vector<uint8_t>* output) const;
- // Exports the public key to an X.509 SubjectPublicKeyInfo block.
- bool ExportPublicKey(std::vector<uint8_t>* output) const;
- // Exports the public key as an EC point in X9.62 uncompressed form. Note this
- // includes the leading 0x04 byte.
- bool ExportRawPublicKey(std::string* output) const;
- private:
- // Constructor is private. Use one of the Create*() methods above instead.
- ECPrivateKey();
- bssl::UniquePtr<EVP_PKEY> key_;
- };
- } // namespace crypto
- #endif // CRYPTO_EC_PRIVATE_KEY_H_
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