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/*
* Copyright (c) 2020, the SerenityOS developers.
* 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/Span.h>
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
namespace Crypto {
struct SignedDivisionResult;
class SignedBigInteger {
public:
SignedBigInteger(i32 x)
: m_sign(x < 0)
, m_unsigned_data(abs(x))
{
}
SignedBigInteger(UnsignedBigInteger&& unsigned_data, bool sign)
: m_sign(sign)
, m_unsigned_data(move(unsigned_data))
{
}
explicit SignedBigInteger(UnsignedBigInteger unsigned_data)
: m_sign(false)
, m_unsigned_data(move(unsigned_data))
{
}
SignedBigInteger()
: m_sign(false)
, m_unsigned_data()
{
}
static SignedBigInteger create_invalid()
{
return { UnsignedBigInteger::create_invalid(), false };
}
static SignedBigInteger import_data(const StringView& data) { return import_data((const u8*)data.characters_without_null_termination(), data.length()); }
static SignedBigInteger import_data(const u8* ptr, size_t length);
size_t export_data(Bytes, bool remove_leading_zeros = false) const;
static SignedBigInteger from_base10(StringView str);
String to_base10() const;
const UnsignedBigInteger& unsigned_value() const { return m_unsigned_data; }
const Vector<u32, STARTING_WORD_SIZE> words() const { return m_unsigned_data.words(); }
bool is_negative() const { return m_sign; }
void negate() { m_sign = !m_sign; }
void set_to_0() { m_unsigned_data.set_to_0(); }
void set_to(i32 other)
{
m_unsigned_data.set_to((u32)other);
m_sign = other < 0;
}
void set_to(const SignedBigInteger& other)
{
m_unsigned_data.set_to(other.m_unsigned_data);
m_sign = other.m_sign;
}
void invalidate()
{
m_unsigned_data.invalidate();
}
bool is_invalid() const { return m_unsigned_data.is_invalid(); }
// These get + 1 byte for the sign.
size_t length() const { return m_unsigned_data.length() + 1; }
size_t trimmed_length() const { return m_unsigned_data.trimmed_length() + 1; };
SignedBigInteger plus(const SignedBigInteger& other) const;
SignedBigInteger minus(const SignedBigInteger& other) const;
SignedBigInteger bitwise_or(const SignedBigInteger& other) const;
SignedBigInteger bitwise_and(const SignedBigInteger& other) const;
SignedBigInteger bitwise_xor(const SignedBigInteger& other) const;
SignedBigInteger bitwise_not() const;
SignedBigInteger shift_left(size_t num_bits) const;
SignedBigInteger multiplied_by(const SignedBigInteger& other) const;
SignedDivisionResult divided_by(const SignedBigInteger& divisor) const;
SignedBigInteger plus(const UnsignedBigInteger& other) const;
SignedBigInteger minus(const UnsignedBigInteger& other) const;
SignedBigInteger bitwise_or(const UnsignedBigInteger& other) const;
SignedBigInteger bitwise_and(const UnsignedBigInteger& other) const;
SignedBigInteger bitwise_xor(const UnsignedBigInteger& other) const;
SignedBigInteger multiplied_by(const UnsignedBigInteger& other) const;
SignedDivisionResult divided_by(const UnsignedBigInteger& divisor) const;
void set_bit_inplace(size_t bit_index);
bool operator==(const SignedBigInteger& other) const;
bool operator!=(const SignedBigInteger& other) const;
bool operator<(const SignedBigInteger& other) const;
bool operator==(const UnsignedBigInteger& other) const;
bool operator!=(const UnsignedBigInteger& other) const;
bool operator<(const UnsignedBigInteger& other) const;
private:
bool m_sign { false };
UnsignedBigInteger m_unsigned_data;
};
struct SignedDivisionResult {
Crypto::SignedBigInteger quotient;
Crypto::SignedBigInteger remainder;
};
}
inline Crypto::SignedBigInteger
operator""_sbigint(const char* string, size_t length)
{
return Crypto::SignedBigInteger::from_base10({ string, length });
}
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