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// 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_
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