1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CRYPTO_EC_PRIVATE_KEY_H_
6 #define CRYPTO_EC_PRIVATE_KEY_H_
15 #include "base/macros.h"
16 #include "build/build_config.h"
17 #include "crypto/crypto_export.h"
18 #include "third_party/boringssl/src/include/openssl/base.h"
22 // Encapsulates an elliptic curve (EC) private key. Can be used to generate new
23 // keys, export keys to other formats, or to extract a public key.
24 // TODO(mattm): make this and RSAPrivateKey implement some PrivateKey interface.
25 // (The difference in types of key() and public_key() make this a little
27 class CRYPTO_EXPORT ECPrivateKey {
31 // Creates a new random instance. Can return nullptr if initialization fails.
32 // The created key will use the NIST P-256 curve.
33 // TODO(mattm): Add a curve parameter.
34 static std::unique_ptr<ECPrivateKey> Create();
36 // Create a new instance by importing an existing private key. The format is
37 // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return
38 // nullptr if initialization fails.
39 static std::unique_ptr<ECPrivateKey> CreateFromPrivateKeyInfo(
40 const std::vector<uint8_t>& input);
42 // Creates a new instance by importing an existing key pair.
43 // The key pair is given as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
44 // block with empty password and an X.509 SubjectPublicKeyInfo block.
45 // Returns nullptr if initialization fails.
47 // This function is deprecated. Use CreateFromPrivateKeyInfo for new code.
48 // See https://crbug.com/603319.
49 static std::unique_ptr<ECPrivateKey> CreateFromEncryptedPrivateKeyInfo(
50 const std::vector<uint8_t>& encrypted_private_key_info);
52 // Returns a copy of the object.
53 std::unique_ptr<ECPrivateKey> Copy() const;
55 EVP_PKEY* key() { return key_.get(); }
57 // Exports the private key to a PKCS #8 PrivateKeyInfo block.
58 bool ExportPrivateKey(std::vector<uint8_t>* output) const;
60 // Exports the private key as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
61 // block wth empty password. This was historically used as a workaround for
62 // NSS API deficiencies and does not provide security.
64 // This function is deprecated. Use ExportPrivateKey for new code. See
65 // https://crbug.com/603319.
66 bool ExportEncryptedPrivateKey(std::vector<uint8_t>* output) const;
68 // Exports the public key to an X.509 SubjectPublicKeyInfo block.
69 bool ExportPublicKey(std::vector<uint8_t>* output) const;
71 // Exports the public key as an EC point in the uncompressed point format.
72 bool ExportRawPublicKey(std::string* output) const;
75 // Constructor is private. Use one of the Create*() methods above instead.
78 bssl::UniquePtr<EVP_PKEY> key_;
80 DISALLOW_COPY_AND_ASSIGN(ECPrivateKey);
86 #endif // CRYPTO_EC_PRIVATE_KEY_H_