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LibCrypto: Add UnsignedBigInteger and implement addition

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UnsignedBigInteger stores an unsigned ainteger of arbitrary length.

A big integer is represented  as a vector of word. Each
word is an unsigned int.
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Itamar 2020-04-07 22:37:42 +03:00 • committed by Andreas Kling
parent 8c645916b4
commit 6201f741d4
4 changed files with 209 additions and 1 deletions
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61
Libraries/LibCrypto/BigInt/UnsignedBigInteger.h Normal file
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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/LogStream.h>
#include <AK/Types.h>
#include <AK/Vector.h>
namespace Crypto {
class UnsignedBigInteger {
public:
UnsignedBigInteger(u32 x) { m_words.append(x); }
UnsignedBigInteger() {}
const AK::Vector<u32>& words() const { return m_words; }
UnsignedBigInteger add(const UnsignedBigInteger& other);
size_t length() const { return m_words.size(); }
// The "trimmed length" is the number of words after trimming leading zeroed words
size_t trimmed_length() const;
bool operator==(const UnsignedBigInteger& other) const;
private:
AK::Vector<u32> m_words;
};
}
inline const LogStream& operator<<(const LogStream& stream, const Crypto::UnsignedBigInteger value)
{
for (int i = value.length() - 1; i >= 0; --i) {
stream << value.words()[i] << "|";
}
return stream;
}