| // @@@ START COPYRIGHT @@@ |
| // |
| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| // |
| // @@@ END COPYRIGHT @@@ |
| |
| #include "ComSSL.h" |
| void aes_create_key(const unsigned char * input, |
| Lng32 input_len, |
| unsigned char * key, |
| Int32 aes_mode) |
| { |
| const Lng32 key_len = EVP_CIPHER_key_length(aes_algorithm_type[aes_mode]); |
| |
| memset(key, 0, key_len); |
| |
| const unsigned char * source; |
| unsigned char * ptr; |
| const unsigned char * input_end = input + input_len; |
| const unsigned char * key_end = key + key_len; |
| |
| // loop through all the characters of the input string, and does an assignment |
| // with bitwise XOR between the input string and key string. If it iterate until |
| // hit the end of key_len byte buffer, just start over from begining of the key |
| // and continue doing ^= |
| // If the length of input string shorter than key_len, it will stop and the end of |
| // the input string. |
| for (ptr = key, source = input; source < input_end; source++, ptr++) |
| { |
| if (ptr == key_end) |
| ptr = key; |
| *ptr ^= *source; |
| } |
| } |