| // Copyright 2012 Google Inc. All Rights Reserved. |
| // |
| // 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. |
| |
| #ifndef POLO_ENCODING_SECRETENCODER_H_ |
| #define POLO_ENCODING_SECRETENCODER_H_ |
| |
| #include <stdint.h> |
| #include <string> |
| #include <vector> |
| |
| namespace polo { |
| namespace encoding { |
| |
| // Encodes and decodes secret challenges. The decoded secret is displayed to the |
| // user on the display device, and entered by the user on the input device. The |
| // secret is encoded for transmission on the wire and used for computing pairing |
| // keys. |
| class SecretEncoder { |
| public: |
| virtual ~SecretEncoder() {} |
| |
| // Encodes a byte array representation of a secret to a string. |
| // @param secret the secret bytes |
| // @return a string representation of the given secret |
| virtual std::string EncodeToString( |
| const std::vector<uint8_t>& secret) const = 0; |
| |
| // Decodes the string representation of the secret to a byte array. |
| // @param secret a string representation of the secret |
| // @return the decoded secret as a byte array |
| virtual std::vector<uint8_t> DecodeToBytes( |
| const std::string& secret) const = 0; |
| |
| // The number of symbols contained in each byte of data. For example, a |
| // hexadecimal encoding has 4 bytes per symbol and therefore 2 symbols per |
| // byte. |
| virtual size_t symbols_per_byte() const = 0; |
| }; |
| |
| } // namespace encoding |
| } // namespace polo |
| |
| #endif // POLO_ENCODING_SECRETENCODER_H_ |