1 // Copyright 2012 The Chromium Authors
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/containers/span.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 {
29 ECPrivateKey(const ECPrivateKey&) = delete;
30 ECPrivateKey& operator=(const ECPrivateKey&) = delete;
34 // Creates a new random instance. Can return nullptr if initialization fails.
35 // The created key will use the NIST P-256 curve.
36 static std::unique_ptr<ECPrivateKey> Create();
38 // Create a new instance by importing an existing private key. The format is
39 // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return
40 // nullptr if initialization fails.
41 static std::unique_ptr<ECPrivateKey> CreateFromPrivateKeyInfo(
42 base::span<const uint8_t> input);
44 // Creates a new instance by importing an existing key pair.
45 // The key pair is given as an ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo
46 // block with empty password and an X.509 SubjectPublicKeyInfo block.
47 // Returns nullptr if initialization fails.
49 // This function is deprecated. Use CreateFromPrivateKeyInfo for new code.
50 // See https://crbug.com/603319.
51 static std::unique_ptr<ECPrivateKey> CreateFromEncryptedPrivateKeyInfo(
52 base::span<const uint8_t> encrypted_private_key_info);
54 // Returns a copy of the object.
55 std::unique_ptr<ECPrivateKey> Copy() const;
57 EVP_PKEY* key() { return key_.get(); }
59 // Exports the private key to a PKCS #8 PrivateKeyInfo block.
60 bool ExportPrivateKey(std::vector<uint8_t>* output) const;
62 // Exports the public key to an X.509 SubjectPublicKeyInfo block.
63 bool ExportPublicKey(std::vector<uint8_t>* output) const;
65 // Exports the public key as an EC point in X9.62 uncompressed form. Note this
66 // includes the leading 0x04 byte.
67 bool ExportRawPublicKey(std::string* output) const;
68 #if BUILDFLAG(IS_TIZEN_TV)
69 static bool ConvertPEMtoDERFromPrivateKey(const std::string& key_buffer,
70 std::vector<uint8_t>* output);
74 // Constructor is private. Use one of the Create*() methods above instead.
77 bssl::UniquePtr<EVP_PKEY> key_;
82 #endif // CRYPTO_EC_PRIVATE_KEY_H_