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. 4 5 #ifndef CRYPTO_EC_PRIVATE_KEY_H_ 6 #define CRYPTO_EC_PRIVATE_KEY_H_ 7 8 #include <stddef.h> 9 #include <stdint.h> 10 11 #include <memory> 12 #include <string> 13 #include <vector> 14 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" 19 20 namespace crypto { 21 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 26 // tricky.) 27 class CRYPTO_EXPORT ECPrivateKey { 28 public: 29 ~ECPrivateKey(); 30 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(); 35 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); 41 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. 46 // 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, 51 const std::vector<uint8_t>& subject_public_key_info); 52 53 // Returns a copy of the object. 54 std::unique_ptr<ECPrivateKey> Copy() const; 55 56 EVP_PKEY* key() { return key_.get(); } 57 58 // Exports the private key to a PKCS #8 PrivateKeyInfo block. 59 bool ExportPrivateKey(std::vector<uint8_t>* output) const; 60 61 // Exports the private key as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo 62 // block wth empty password. This was historically used as a workaround for 63 // NSS API deficiencies and does not provide security. 64 // 65 // This function is deprecated. Use ExportPrivateKey for new code. See 66 // https://crbug.com/603319. 67 bool ExportEncryptedPrivateKey(std::vector<uint8_t>* output) const; 68 69 // Exports the public key to an X.509 SubjectPublicKeyInfo block. 70 bool ExportPublicKey(std::vector<uint8_t>* output) const; 71 72 // Exports the public key as an EC point in the uncompressed point format. 73 bool ExportRawPublicKey(std::string* output) const; 74 75 private: 76 // Constructor is private. Use one of the Create*() methods above instead. 77 ECPrivateKey(); 78 79 bssl::UniquePtr<EVP_PKEY> key_; 80 81 DISALLOW_COPY_AND_ASSIGN(ECPrivateKey); 82 }; 83 84 85 } // namespace crypto 86 87 #endif // CRYPTO_EC_PRIVATE_KEY_H_ 88
