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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 <keymaster/legacy_support/ec_keymaster1_key.h>
#include <memory>
#include <keymaster/km_openssl/ecdsa_operation.h>
#include <keymaster/logger.h>
#include "ecdsa_keymaster1_operation.h"
using std::unique_ptr;
namespace keymaster {
EcdsaKeymaster1KeyFactory::EcdsaKeymaster1KeyFactory(const SoftwareKeyBlobMaker& blob_maker,
const KeymasterContext& context,
const Keymaster1Engine* engine)
: EcKeyFactory(blob_maker, context), engine_(engine),
sign_factory_(new (std::nothrow) EcdsaKeymaster1OperationFactory(KM_PURPOSE_SIGN, engine)),
// For pubkey ops we can use the normal operation factories.
verify_factory_(new (std::nothrow) 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,
UniquePtr<Key> /* attest_key */,
const KeymasterBlob& /* issuer_subject */,
KeymasterKeyBlob* key_blob,
AuthorizationSet* hw_enforced,
AuthorizationSet* sw_enforced,
CertificateChain* /* cert_chain */) const {
AuthorizationSet key_params_copy;
UpdateToWorkAroundUnsupportedDigests(key_description, &key_params_copy);
keymaster_ec_curve_t ec_curve;
uint32_t key_size;
keymaster_error_t error = GetCurveAndSize(key_description, &ec_curve, &key_size);
if (error != KM_ERROR_OK) {
return error;
} else if (!key_description.Contains(TAG_KEY_SIZE, key_size)) {
key_params_copy.push_back(TAG_KEY_SIZE, key_size);
}
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, //
UniquePtr<Key> /* attest_key */, //
const KeymasterBlob& /* issuer_subject */,
KeymasterKeyBlob* output_key_blob, //
AuthorizationSet* hw_enforced, //
AuthorizationSet* sw_enforced,
CertificateChain* /* cert_chain */) 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(KeymasterKeyBlob&& key_material,
const AuthorizationSet& additional_params,
AuthorizationSet&& hw_enforced,
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(), move(hw_enforced), move(sw_enforced), this));
if (!(*key)) return KM_ERROR_MEMORY_ALLOCATION_FAILED;
(*key)->key_material() = move(key_material);
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
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