/*
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* Copyright 2014 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 "triple_des_operation.h"
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namespace keymaster {
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static const keymaster_block_mode_t supported_block_modes[] = {KM_MODE_ECB, KM_MODE_CBC};
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const keymaster_block_mode_t*
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TripleDesEvpCipherDescription::SupportedBlockModes(size_t* block_mode_count) const {
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*block_mode_count = array_length(supported_block_modes);
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return supported_block_modes;
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}
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const EVP_CIPHER*
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TripleDesEvpCipherDescription::GetCipherInstance(size_t key_size, keymaster_block_mode_t block_mode,
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keymaster_error_t* error) const {
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*error = KM_ERROR_OK;
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switch (block_mode) {
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case KM_MODE_ECB:
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switch (key_size) {
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case 16:
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return EVP_des_ede(); // Note: OpenSSL 1.1.0 renamed this to EVP_des_ede_ecb
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case 24:
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return EVP_des_ede3(); // Note: OpenSSL 1.1.0 renamed this to EVP_des_ede3_ecb
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default:
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*error = KM_ERROR_UNSUPPORTED_KEY_SIZE;
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break;
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}
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break;
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case KM_MODE_CBC:
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switch (key_size) {
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case 16:
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return EVP_des_ede_cbc();
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case 24:
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return EVP_des_ede3_cbc();
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default:
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*error = KM_ERROR_UNSUPPORTED_KEY_SIZE;
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break;
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}
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break;
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default:
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*error = KM_ERROR_UNSUPPORTED_BLOCK_MODE;
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break;
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}
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assert(*error != KM_ERROR_OK);
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return nullptr;
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}
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static TripleDesEvpCipherDescription description;
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const EvpCipherDescription& TripleDesOperationFactory::GetCipherDescription() const {
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return description;
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}
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} // namespace keymaster
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