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      1 /*
      2  * Copyright 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "triple_des_operation.h"
     18 
     19 namespace keymaster {
     20 
     21 static const keymaster_block_mode_t supported_block_modes[] = {KM_MODE_ECB, KM_MODE_CBC};
     22 
     23 const keymaster_block_mode_t*
     24 TripleDesEvpCipherDescription::SupportedBlockModes(size_t* block_mode_count) const {
     25     *block_mode_count = array_length(supported_block_modes);
     26     return supported_block_modes;
     27 }
     28 
     29 const EVP_CIPHER*
     30 TripleDesEvpCipherDescription::GetCipherInstance(size_t key_size, keymaster_block_mode_t block_mode,
     31                                                  keymaster_error_t* error) const {
     32     *error = KM_ERROR_OK;
     33 
     34     switch (block_mode) {
     35     case KM_MODE_ECB:
     36         switch (key_size) {
     37         case 16:
     38             return EVP_des_ede();  // Note: OpenSSL 1.1.0 renamed this to EVP_des_ede_ecb
     39         case 24:
     40             return EVP_des_ede3();  // Note: OpenSSL 1.1.0 renamed this to EVP_des_ede3_ecb
     41         default:
     42             *error = KM_ERROR_UNSUPPORTED_KEY_SIZE;
     43             break;
     44         }
     45         break;
     46 
     47     case KM_MODE_CBC:
     48         switch (key_size) {
     49         case 16:
     50             return EVP_des_ede_cbc();
     51         case 24:
     52             return EVP_des_ede3_cbc();
     53         default:
     54             *error = KM_ERROR_UNSUPPORTED_KEY_SIZE;
     55             break;
     56         }
     57         break;
     58 
     59     default:
     60         *error = KM_ERROR_UNSUPPORTED_BLOCK_MODE;
     61         break;
     62     }
     63 
     64     assert(*error != KM_ERROR_OK);
     65     return nullptr;
     66 }
     67 
     68 static TripleDesEvpCipherDescription description;
     69 const EvpCipherDescription& TripleDesOperationFactory::GetCipherDescription() const {
     70     return description;
     71 }
     72 
     73 }  // namespace keymaster
     74