hexadecimalencoder.h revision 7c9978567a202d6aa98beac5da5e1b3b34792862 
1// Copyright 2012 Google Inc. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef POLO_ENCODING_HEXADECIMALENCODER_H_
16#define POLO_ENCODING_HEXADECIMALENCODER_H_
17
18#include <string>
19#include <vector>
20
21#include "polo/encoding/secretencoder.h"
22
23namespace polo {
24namespace encoding {
25
26// Encodes and decodes secret challenges as hexadecimal strings.
27class HexadecimalEncoder : public SecretEncoder {
28 public:
29  // @override
30  virtual std::string EncodeToString(
31      const std::vector<uint8_t>& secret) const;
32
33  // @override
34  virtual std::vector<uint8_t> DecodeToBytes(
35      const std::string& secret) const;
36
37  // @override
38  virtual size_t symbols_per_byte() const;\
39 private:
40  enum {
41    // Hex encoding has 2 symbols per byte since each hex character uses 4 bits.
42    HEX_SYMBOLS_PER_BYTE = 2
43  };
44};
45
46}  // namespace encoding
47}  // namespace polo
48
49#endif  // POLO_ENCODING_HEXADECIMALENCODER_H_
50