128 lines
5.2 KiB
C++
128 lines
5.2 KiB
C++
/*
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* Copyright 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "rsa_keymaster0_key.h"
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#include <memory>
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#include <keymaster/android_keymaster_utils.h>
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#include <keymaster/logger.h>
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#include <keymaster/soft_keymaster_context.h>
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#include "keymaster0_engine.h"
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#include "openssl_utils.h"
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using std::unique_ptr;
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namespace keymaster {
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RsaKeymaster0KeyFactory::RsaKeymaster0KeyFactory(const SoftKeymasterContext* context,
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const Keymaster0Engine* engine)
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: RsaKeyFactory(context), engine_(engine) {}
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keymaster_error_t RsaKeymaster0KeyFactory::GenerateKey(const AuthorizationSet& key_description,
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KeymasterKeyBlob* key_blob,
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AuthorizationSet* hw_enforced,
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AuthorizationSet* sw_enforced) const {
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if (!key_blob || !hw_enforced || !sw_enforced)
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return KM_ERROR_OUTPUT_PARAMETER_NULL;
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uint64_t public_exponent;
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if (!key_description.GetTagValue(TAG_RSA_PUBLIC_EXPONENT, &public_exponent)) {
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LOG_E("%s", "No public exponent specified for RSA key generation");
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return KM_ERROR_INVALID_ARGUMENT;
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}
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uint32_t key_size;
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if (!key_description.GetTagValue(TAG_KEY_SIZE, &key_size)) {
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LOG_E("%s", "No key size specified for RSA key generation");
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return KM_ERROR_UNSUPPORTED_KEY_SIZE;
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}
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KeymasterKeyBlob key_material;
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if (!engine_->GenerateRsaKey(public_exponent, key_size, &key_material))
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return KM_ERROR_UNKNOWN_ERROR;
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// These tags are hardware-enforced. Putting them in the hw_enforced set here will ensure that
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// context_->CreateKeyBlob doesn't put them in sw_enforced.
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hw_enforced->push_back(TAG_ALGORITHM, KM_ALGORITHM_RSA);
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hw_enforced->push_back(TAG_RSA_PUBLIC_EXPONENT, public_exponent);
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hw_enforced->push_back(TAG_KEY_SIZE, key_size);
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hw_enforced->push_back(TAG_ORIGIN, KM_ORIGIN_UNKNOWN);
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return context_->CreateKeyBlob(key_description, KM_ORIGIN_UNKNOWN, key_material, key_blob,
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hw_enforced, sw_enforced);
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}
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keymaster_error_t RsaKeymaster0KeyFactory::ImportKey(
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const AuthorizationSet& key_description, keymaster_key_format_t input_key_material_format,
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const KeymasterKeyBlob& input_key_material, KeymasterKeyBlob* output_key_blob,
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AuthorizationSet* hw_enforced, AuthorizationSet* sw_enforced) const {
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if (!output_key_blob || !hw_enforced || !sw_enforced)
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return KM_ERROR_OUTPUT_PARAMETER_NULL;
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AuthorizationSet authorizations;
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uint64_t public_exponent;
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uint32_t key_size;
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keymaster_error_t error =
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UpdateImportKeyDescription(key_description, input_key_material_format, input_key_material,
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&authorizations, &public_exponent, &key_size);
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if (error != KM_ERROR_OK)
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return error;
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KeymasterKeyBlob imported_hw_key;
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if (!engine_->ImportKey(input_key_material_format, input_key_material, &imported_hw_key))
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return KM_ERROR_UNKNOWN_ERROR;
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// These tags are hardware-enforced. Putting them in the hw_enforced set here will ensure that
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// context_->CreateKeyBlob doesn't put them in sw_enforced.
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hw_enforced->push_back(TAG_ALGORITHM, KM_ALGORITHM_RSA);
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hw_enforced->push_back(TAG_RSA_PUBLIC_EXPONENT, public_exponent);
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hw_enforced->push_back(TAG_KEY_SIZE, key_size);
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hw_enforced->push_back(TAG_ORIGIN, KM_ORIGIN_UNKNOWN);
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return context_->CreateKeyBlob(authorizations, KM_ORIGIN_UNKNOWN, imported_hw_key,
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output_key_blob, hw_enforced, sw_enforced);
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}
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keymaster_error_t RsaKeymaster0KeyFactory::LoadKey(const KeymasterKeyBlob& key_material,
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const AuthorizationSet& additional_params,
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const AuthorizationSet& hw_enforced,
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const AuthorizationSet& sw_enforced,
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UniquePtr<Key>* key) const {
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if (!key)
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return KM_ERROR_OUTPUT_PARAMETER_NULL;
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if (sw_enforced.GetTagCount(TAG_ALGORITHM) == 1)
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return super::LoadKey(key_material, additional_params, hw_enforced, sw_enforced, key);
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unique_ptr<RSA, RSA_Delete> rsa(engine_->BlobToRsaKey(key_material));
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if (!rsa)
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return KM_ERROR_UNKNOWN_ERROR;
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keymaster_error_t error;
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key->reset(new (std::nothrow)
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RsaKeymaster0Key(rsa.release(), hw_enforced, sw_enforced, &error));
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if (!key->get())
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error = KM_ERROR_MEMORY_ALLOCATION_FAILED;
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if (error != KM_ERROR_OK)
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return error;
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return KM_ERROR_OK;
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}
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} // namespace keymaster
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