| /* |
| * Copyright 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "ec_keymaster1_key.h" |
| |
| #include <memory> |
| |
| #include <keymaster/logger.h> |
| |
| #include "ecdsa_keymaster1_operation.h" |
| #include "ecdsa_operation.h" |
| |
| using std::unique_ptr; |
| |
| namespace keymaster { |
| |
| EcdsaKeymaster1KeyFactory::EcdsaKeymaster1KeyFactory(const SoftKeymasterContext* context, |
| const Keymaster1Engine* engine) |
| : EcKeyFactory(context), engine_(engine), |
| sign_factory_(new EcdsaKeymaster1OperationFactory(KM_PURPOSE_SIGN, engine)), |
| // For pubkey ops we can use the normal operation factories. |
| verify_factory_(new EcdsaVerifyOperationFactory) {} |
| |
| static bool is_supported(uint32_t digest) { |
| return digest == KM_DIGEST_NONE || digest == KM_DIGEST_SHA_2_256; |
| } |
| |
| static void UpdateToWorkAroundUnsupportedDigests(const AuthorizationSet& key_description, |
| AuthorizationSet* new_description) { |
| bool have_unsupported_digests = false; |
| bool have_digest_none = false; |
| for (const keymaster_key_param_t& entry : key_description) { |
| new_description->push_back(entry); |
| |
| if (entry.tag == TAG_DIGEST) { |
| if (entry.enumerated == KM_DIGEST_NONE) { |
| have_digest_none = true; |
| } else if (!is_supported(entry.enumerated)) { |
| LOG_D("Found request for unsupported digest %u", entry.enumerated); |
| have_unsupported_digests = true; |
| } |
| } |
| } |
| |
| if (have_unsupported_digests && !have_digest_none) { |
| LOG_I("Adding KM_DIGEST_NONE to key authorization, to enable software digesting", 0); |
| new_description->push_back(TAG_DIGEST, KM_DIGEST_NONE); |
| } |
| } |
| |
| keymaster_error_t EcdsaKeymaster1KeyFactory::GenerateKey(const AuthorizationSet& key_description, |
| KeymasterKeyBlob* key_blob, |
| AuthorizationSet* hw_enforced, |
| AuthorizationSet* sw_enforced) const { |
| AuthorizationSet key_params_copy; |
| UpdateToWorkAroundUnsupportedDigests(key_description, &key_params_copy); |
| return engine_->GenerateKey(key_params_copy, key_blob, hw_enforced, sw_enforced); |
| } |
| |
| keymaster_error_t EcdsaKeymaster1KeyFactory::ImportKey( |
| const AuthorizationSet& key_description, keymaster_key_format_t input_key_material_format, |
| const KeymasterKeyBlob& input_key_material, KeymasterKeyBlob* output_key_blob, |
| AuthorizationSet* hw_enforced, AuthorizationSet* sw_enforced) const { |
| AuthorizationSet key_params_copy; |
| UpdateToWorkAroundUnsupportedDigests(key_description, &key_params_copy); |
| return engine_->ImportKey(key_params_copy, input_key_material_format, input_key_material, |
| output_key_blob, hw_enforced, sw_enforced); |
| } |
| |
| keymaster_error_t EcdsaKeymaster1KeyFactory::LoadKey(const KeymasterKeyBlob& key_material, |
| const AuthorizationSet& additional_params, |
| const AuthorizationSet& hw_enforced, |
| const AuthorizationSet& sw_enforced, |
| UniquePtr<Key>* key) const { |
| if (!key) |
| return KM_ERROR_OUTPUT_PARAMETER_NULL; |
| |
| keymaster_error_t error; |
| unique_ptr<EC_KEY, EC_KEY_Delete> ecdsa( |
| engine_->BuildEcKey(key_material, additional_params, &error)); |
| if (!ecdsa) |
| return error; |
| |
| key->reset(new (std::nothrow) |
| EcdsaKeymaster1Key(ecdsa.release(), hw_enforced, sw_enforced, &error)); |
| if (!key->get()) |
| error = KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| |
| if (error != KM_ERROR_OK) |
| return error; |
| |
| return KM_ERROR_OK; |
| } |
| |
| OperationFactory* |
| EcdsaKeymaster1KeyFactory::GetOperationFactory(keymaster_purpose_t purpose) const { |
| switch (purpose) { |
| case KM_PURPOSE_SIGN: |
| return sign_factory_.get(); |
| case KM_PURPOSE_VERIFY: |
| return verify_factory_.get(); |
| default: |
| return nullptr; |
| } |
| } |
| |
| } // namespace keymaster |