129 lines
4.5 KiB
C++
129 lines
4.5 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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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_EC_PRIVATE_KEY_H_
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#define 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 "base/macros.h"
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#include "build/build_config.h"
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#include "crypto/crypto_export.h"
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#if defined(USE_OPENSSL)
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// Forward declaration for openssl/*.h
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typedef struct evp_pkey_st EVP_PKEY;
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#else
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// Forward declaration.
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typedef struct CERTSubjectPublicKeyInfoStr CERTSubjectPublicKeyInfo;
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typedef struct PK11SlotInfoStr PK11SlotInfo;
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typedef struct SECKEYPrivateKeyStr SECKEYPrivateKey;
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typedef struct SECKEYPublicKeyStr SECKEYPublicKey;
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#endif
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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();
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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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const std::vector<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 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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const std::string& password,
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const std::vector<uint8_t>& encrypted_private_key_info,
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const std::vector<uint8_t>& subject_public_key_info);
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#if !defined(USE_OPENSSL)
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// Imports the key pair into |slot| and returns in |public_key| and |key|.
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// Shortcut for code that needs to keep a reference directly to NSS types
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// without having to create a ECPrivateKey object and make a copy of them.
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// TODO(mattm): move this function to some NSS util file.
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static bool ImportFromEncryptedPrivateKeyInfo(
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PK11SlotInfo* slot,
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const std::string& password,
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const uint8_t* encrypted_private_key_info,
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size_t encrypted_private_key_info_len,
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CERTSubjectPublicKeyInfo* decoded_spki,
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bool permanent,
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bool sensitive,
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SECKEYPrivateKey** key,
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SECKEYPublicKey** public_key);
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#endif
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// Returns a copy of the object.
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std::unique_ptr<ECPrivateKey> Copy() const;
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#if defined(USE_OPENSSL)
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EVP_PKEY* key() { return key_; }
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#else
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SECKEYPrivateKey* key() { return key_; }
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SECKEYPublicKey* public_key() { return public_key_; }
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#endif
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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 and the public key as an X.509 SubjectPublicKeyInfo block.
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// The |password| and |iterations| are used as inputs to the key derivation
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// function for generating the encryption key. PKCS #5 recommends a minimum
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// of 1000 iterations, on modern systems a larger value may be preferrable.
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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(const std::string& password,
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int iterations,
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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 the uncompressed point format.
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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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#if defined(USE_OPENSSL)
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EVP_PKEY* key_;
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#else
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SECKEYPrivateKey* key_;
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SECKEYPublicKey* public_key_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(ECPrivateKey);
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};
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} // namespace crypto
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#endif // CRYPTO_EC_PRIVATE_KEY_H_
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