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/*
* 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_keymaster0_key.h"
#include <memory>
#include <keymaster/android_keymaster_utils.h>
#include <keymaster/logger.h>
#include <keymaster/soft_keymaster_context.h>
#include "keymaster0_engine.h"
#include "openssl_utils.h"
using std::unique_ptr;
namespace keymaster {
EcdsaKeymaster0KeyFactory::EcdsaKeymaster0KeyFactory(const SoftKeymasterContext* context,
const Keymaster0Engine* engine)
: EcKeyFactory(context), engine_(engine), soft_context_(context) {
}
keymaster_error_t EcdsaKeymaster0KeyFactory::GenerateKey(const AuthorizationSet& key_description,
KeymasterKeyBlob* key_blob,
AuthorizationSet* hw_enforced,
AuthorizationSet* sw_enforced) const {
if (!key_blob || !hw_enforced || !sw_enforced)
return KM_ERROR_OUTPUT_PARAMETER_NULL;
if (!engine_ || !engine_->supports_ec())
return super::GenerateKey(key_description, key_blob, hw_enforced, sw_enforced);
uint32_t key_size;
if (!key_description.GetTagValue(TAG_KEY_SIZE, &key_size)) {
LOG_E("%s", "No key size specified for EC key generation");
return KM_ERROR_UNSUPPORTED_KEY_SIZE;
}
KeymasterKeyBlob key_material;
if (!engine_->GenerateEcKey(key_size, &key_material))
return KM_ERROR_UNKNOWN_ERROR;
// These tags are hardware-enforced. Putting them in the hw_enforced set here will ensure that
// context_->CreateKeyBlob doesn't put them in sw_enforced.
hw_enforced->push_back(TAG_ALGORITHM, KM_ALGORITHM_EC);
hw_enforced->push_back(TAG_KEY_SIZE, key_size);
return context_->CreateKeyBlob(key_description, KM_ORIGIN_GENERATED, key_material, key_blob,
hw_enforced, sw_enforced);
}
keymaster_error_t EcdsaKeymaster0KeyFactory::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 {
if (!output_key_blob || !hw_enforced || !sw_enforced)
return KM_ERROR_OUTPUT_PARAMETER_NULL;
if (!engine_ || !engine_->supports_ec())
return super::ImportKey(key_description, input_key_material_format, input_key_material,
output_key_blob, hw_enforced, sw_enforced);
AuthorizationSet authorizations;
uint32_t key_size;
keymaster_error_t error = UpdateImportKeyDescription(
key_description, input_key_material_format, input_key_material, &authorizations, &key_size);
if (error != KM_ERROR_OK)
return error;
KeymasterKeyBlob imported_hw_key;
if (!engine_->ImportKey(input_key_material_format, input_key_material, &imported_hw_key))
return KM_ERROR_UNKNOWN_ERROR;
// These tags are hardware-enforced. Putting them in the hw_enforced set here will ensure that
// context_->CreateKeyBlob doesn't put them in sw_enforced.
hw_enforced->push_back(TAG_ALGORITHM, KM_ALGORITHM_EC);
hw_enforced->push_back(TAG_KEY_SIZE, key_size);
return context_->CreateKeyBlob(authorizations, KM_ORIGIN_IMPORTED, imported_hw_key,
output_key_blob, hw_enforced, sw_enforced);
}
keymaster_error_t EcdsaKeymaster0KeyFactory::LoadKey(const KeymasterKeyBlob& key_material,
const AuthorizationSet& hw_enforced,
const AuthorizationSet& sw_enforced,
UniquePtr<Key>* key) const {
if (!key)
return KM_ERROR_OUTPUT_PARAMETER_NULL;
if (sw_enforced.GetTagCount(TAG_ALGORITHM) == 1)
return super::LoadKey(key_material, hw_enforced, sw_enforced, key);
unique_ptr<EC_KEY, EC_Delete> ec_key(engine_->BlobToEcKey(key_material));
if (!ec_key)
return KM_ERROR_UNKNOWN_ERROR;
keymaster_error_t error;
key->reset(new (std::nothrow)
EcKeymaster0Key(ec_key.release(), hw_enforced, sw_enforced, engine_, &error));
if (error != KM_ERROR_OK)
return error;
return KM_ERROR_OK;
}
EcKeymaster0Key::EcKeymaster0Key(EC_KEY* ec_key, const AuthorizationSet& hw_enforced,
const AuthorizationSet& sw_enforced,
const Keymaster0Engine* engine, keymaster_error_t* error)
: EcKey(ec_key, hw_enforced, sw_enforced, error), engine_(engine) {
}
keymaster_error_t EcKeymaster0Key::key_material(UniquePtr<uint8_t[]>* material,
size_t* size) const {
if (!engine_)
return super::key_material(material, size);
const keymaster_key_blob_t* blob = engine_->EcKeyToBlob(key());
if (!blob)
return KM_ERROR_UNKNOWN_ERROR;
*size = blob->key_material_size;
material->reset(dup_buffer(blob->key_material, *size));
if (!material->get())
return KM_ERROR_MEMORY_ALLOCATION_FAILED;
return KM_ERROR_OK;
}
} // namespace keymaster
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