blob: 9e2f13e050a08ab5e330b0aa42ab83c7df0ec874
1 | /* |
2 | * Copyright 2015 The Android Open Source Project |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #ifndef SYSTEM_KEYMASTER_KEYMASTER1_ENGINE_H_ |
18 | #define SYSTEM_KEYMASTER_KEYMASTER1_ENGINE_H_ |
19 | |
20 | #include <memory> |
21 | |
22 | #include <openssl/ec.h> |
23 | #include <openssl/engine.h> |
24 | #include <openssl/ex_data.h> |
25 | #include <openssl/rsa.h> |
26 | |
27 | #include <hardware/keymaster1.h> |
28 | #include <hardware/keymaster_defs.h> |
29 | |
30 | #include <keymaster/android_keymaster_utils.h> |
31 | #include <keymaster/authorization_set.h> |
32 | |
33 | #include "openssl_utils.h" |
34 | |
35 | namespace keymaster { |
36 | |
37 | class Keymaster1Engine { |
38 | public: |
39 | /** |
40 | * Create a Keymaster1Engine, wrapping the provided keymaster1_device. The engine takes |
41 | * ownership of the device, and will close it during destruction. |
42 | */ |
43 | explicit Keymaster1Engine(const keymaster1_device_t* keymaster1_device); |
44 | ~Keymaster1Engine(); |
45 | |
46 | keymaster_error_t GenerateKey(const AuthorizationSet& key_description, |
47 | KeymasterKeyBlob* key_material, AuthorizationSet* hw_enforced, |
48 | AuthorizationSet* sw_enforced) const; |
49 | |
50 | keymaster_error_t ImportKey(const AuthorizationSet& key_description, |
51 | keymaster_key_format_t input_key_material_format, |
52 | const KeymasterKeyBlob& input_key_material, |
53 | KeymasterKeyBlob* output_key_blob, AuthorizationSet* hw_enforced, |
54 | AuthorizationSet* sw_enforced) const; |
55 | keymaster_error_t DeleteKey(const KeymasterKeyBlob& blob) const; |
56 | keymaster_error_t DeleteAllKeys() const; |
57 | |
58 | struct KeyData { |
59 | KeyData(const KeymasterKeyBlob& blob, const AuthorizationSet& params) |
60 | : op_handle(0), begin_params(params), key_material(blob), error(KM_ERROR_OK), |
61 | expected_openssl_padding(-1) {} |
62 | |
63 | keymaster_operation_handle_t op_handle; |
64 | AuthorizationSet begin_params; |
65 | AuthorizationSet finish_params; |
66 | KeymasterKeyBlob key_material; |
67 | keymaster_error_t error; |
68 | int expected_openssl_padding; |
69 | }; |
70 | |
71 | RSA* BuildRsaKey(const KeymasterKeyBlob& blob, const AuthorizationSet& additional_params, |
72 | keymaster_error_t* error) const; |
73 | EC_KEY* BuildEcKey(const KeymasterKeyBlob& blob, const AuthorizationSet& additional_params, |
74 | keymaster_error_t* error) const; |
75 | |
76 | KeyData* GetData(EVP_PKEY* key) const; |
77 | KeyData* GetData(const RSA* rsa) const; |
78 | KeyData* GetData(const EC_KEY* rsa) const; |
79 | |
80 | const keymaster1_device_t* device() const { return keymaster1_device_; } |
81 | |
82 | EVP_PKEY* GetKeymaster1PublicKey(const KeymasterKeyBlob& blob, |
83 | const AuthorizationSet& additional_params, |
84 | keymaster_error_t* error) const; |
85 | |
86 | private: |
87 | Keymaster1Engine(const Keymaster1Engine&); // Uncopyable |
88 | void operator=(const Keymaster1Engine&); // Unassignable |
89 | |
90 | RSA_METHOD BuildRsaMethod(); |
91 | ECDSA_METHOD BuildEcdsaMethod(); |
92 | void ConfigureEngineForRsa(); |
93 | void ConfigureEngineForEcdsa(); |
94 | |
95 | keymaster_error_t Keymaster1Finish(const KeyData* key_data, const keymaster_blob_t& input, |
96 | keymaster_blob_t* output); |
97 | |
98 | static int duplicate_key_data(CRYPTO_EX_DATA* to, const CRYPTO_EX_DATA* from, void** from_d, |
99 | int index, long argl, void* argp); |
100 | static void free_key_data(void* parent, void* ptr, CRYPTO_EX_DATA* data, int index, long argl, |
101 | void* argp); |
102 | |
103 | static int rsa_sign_raw(RSA* rsa, size_t* out_len, uint8_t* out, size_t max_out, |
104 | const uint8_t* in, size_t in_len, int padding); |
105 | static int rsa_decrypt(RSA* rsa, size_t* out_len, uint8_t* out, size_t max_out, |
106 | const uint8_t* in, size_t in_len, int padding); |
107 | static int ecdsa_sign(const uint8_t* digest, size_t digest_len, uint8_t* sig, |
108 | unsigned int* sig_len, EC_KEY* ec_key); |
109 | |
110 | const keymaster1_device_t* const keymaster1_device_; |
111 | const std::unique_ptr<ENGINE, ENGINE_Delete> engine_; |
112 | const int rsa_index_; |
113 | const int ec_key_index_; |
114 | |
115 | const RSA_METHOD rsa_method_; |
116 | const ECDSA_METHOD ecdsa_method_; |
117 | |
118 | static Keymaster1Engine* instance_; |
119 | }; |
120 | |
121 | } // namespace keymaster |
122 | |
123 | #endif // SYSTEM_KEYMASTER_KEYMASTER1_ENGINE_H_ |
124 |