/*
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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 <keymaster/contexts/soft_keymaster_context.h>
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#include <keymaster/legacy_support/rsa_keymaster1_key.h>
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#include <keymaster/km_openssl/openssl_utils.h>
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#include <keymaster/logger.h>
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#include "rsa_keymaster1_operation.h"
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namespace keymaster {
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RsaKeymaster1KeyFactory::RsaKeymaster1KeyFactory(const SoftwareKeyBlobMaker* blob_maker,
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const Keymaster1Engine* engine)
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: RsaKeyFactory(blob_maker), engine_(engine),
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sign_factory_(new RsaKeymaster1OperationFactory(KM_PURPOSE_SIGN, engine)),
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decrypt_factory_(new RsaKeymaster1OperationFactory(KM_PURPOSE_DECRYPT, engine)),
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// For pubkey ops we can use the normal operation factories.
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verify_factory_(new RsaVerificationOperationFactory),
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encrypt_factory_(new RsaEncryptionOperationFactory) {}
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static bool is_supported(uint32_t digest) {
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return digest == KM_DIGEST_NONE || digest == KM_DIGEST_SHA_2_256;
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}
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static void UpdateToWorkAroundUnsupportedDigests(const AuthorizationSet& key_description,
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AuthorizationSet* new_description) {
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bool have_unsupported_digests = false;
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bool have_digest_none = false;
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bool have_pad_none = false;
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bool have_padding_requiring_digest = false;
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for (const keymaster_key_param_t& entry : key_description) {
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new_description->push_back(entry);
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if (entry.tag == TAG_DIGEST) {
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if (entry.enumerated == KM_DIGEST_NONE) {
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have_digest_none = true;
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} else if (!is_supported(entry.enumerated)) {
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LOG_D("Found request for unsupported digest %u", entry.enumerated);
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have_unsupported_digests = true;
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}
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}
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if (entry.tag == TAG_PADDING) {
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switch (entry.enumerated) {
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case KM_PAD_RSA_PSS:
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case KM_PAD_RSA_OAEP:
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have_padding_requiring_digest = true;
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break;
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case KM_PAD_NONE:
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have_pad_none = true;
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break;
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}
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}
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}
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if (have_unsupported_digests && !have_digest_none) {
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LOG_I("Adding KM_DIGEST_NONE to key authorization, to enable software digesting", 0);
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new_description->push_back(TAG_DIGEST, KM_DIGEST_NONE);
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}
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if (have_unsupported_digests && have_padding_requiring_digest && !have_pad_none) {
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LOG_I("Adding KM_PAD_NONE to key authorization, to enable PSS or OAEP software padding", 0);
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new_description->push_back(TAG_PADDING, KM_PAD_NONE);
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}
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}
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keymaster_error_t RsaKeymaster1KeyFactory::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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AuthorizationSet key_params_copy;
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UpdateToWorkAroundUnsupportedDigests(key_description, &key_params_copy);
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return engine_->GenerateKey(key_params_copy, key_blob, hw_enforced, sw_enforced);
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}
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keymaster_error_t RsaKeymaster1KeyFactory::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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AuthorizationSet key_params_copy;
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UpdateToWorkAroundUnsupportedDigests(key_description, &key_params_copy);
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return engine_->ImportKey(key_params_copy, input_key_material_format, input_key_material,
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output_key_blob, hw_enforced, sw_enforced);
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}
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keymaster_error_t RsaKeymaster1KeyFactory::LoadKey(KeymasterKeyBlob&& key_material,
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const AuthorizationSet& additional_params,
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AuthorizationSet&& hw_enforced,
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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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keymaster_error_t error;
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RSA_Ptr rsa(engine_->BuildRsaKey(key_material, additional_params, &error));
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if (!rsa.get())
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return error;
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key->reset(new (std::nothrow)
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RsaKeymaster1Key(rsa.release(), move(hw_enforced), move(sw_enforced), this));
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if (!(*key))
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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(*key)->key_material() = move(key_material);
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return KM_ERROR_OK;
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}
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OperationFactory* RsaKeymaster1KeyFactory::GetOperationFactory(keymaster_purpose_t purpose) const {
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switch (purpose) {
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case KM_PURPOSE_SIGN:
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return sign_factory_.get();
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case KM_PURPOSE_VERIFY:
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return verify_factory_.get();
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case KM_PURPOSE_ENCRYPT:
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return encrypt_factory_.get();
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case KM_PURPOSE_DECRYPT:
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return decrypt_factory_.get();
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case KM_PURPOSE_DERIVE_KEY:
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case KM_PURPOSE_WRAP:
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break;
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}
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return nullptr;
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}
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} // namespace keymaster
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