88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*
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* This file is a part of Tito - a cryptography library
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2018, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef headerfile_tito_base32
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#define headerfile_tito_base32
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#include <string>
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namespace Tito
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{
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class Base32
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{
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public:
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Base32();
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// default '=';
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void SetPadding(char c);
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void Encode(const char * in, size_t len, std::string & out);
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void Encode(const char * in, std::string & out);
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void Encode(const std::string & in, std::string & out);
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bool Decode(const char * in, size_t len, std::string & out);
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bool Decode(const char * in, std::string & out);
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bool Decode(const std::string & in, std::string & out);
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private:
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static const char * tabbase32;
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size_t tabbase32_len;
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char padding;
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unsigned int not_existing;
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void Convert5to8Pieces(const char * s, size_t len, unsigned int * tab8);
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void ConvertFrom8to5Pieces(const unsigned int * tab8, unsigned int * tab5);
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bool CharFromBase32(unsigned int from, unsigned int & to);
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bool Make8pieces(const char * s, unsigned int * tab8);
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void Save8PiecesToString(std::string & s, const unsigned int * tab8);
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void Save5PiecesToString(std::string & s, const unsigned int * tab5);
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};
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} // namespace Tito
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#endif
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