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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_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_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, engine_, &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;
}
}
EcdsaKeymaster1Key::EcdsaKeymaster1Key(EC_KEY* ecdsa_key, const AuthorizationSet& hw_enforced,
const AuthorizationSet& sw_enforced,
const Keymaster1Engine* engine, keymaster_error_t* error)
: EcKey(ecdsa_key, hw_enforced, sw_enforced, error), engine_(engine) {}
} // namespace keymaster
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