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 |