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LibCrypto: Split BigInteger operations into an Algorithms class

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Since the operations are already complicated and will become even more
so soon, let's split them into their own files. We can also integrate
the NumberTheory operations that would better fit there into this class
as well.

This commit doesn't change behaviors, but moves the allocation of some
variables into caller classes.
This commit is contained in:
DexesTTP 2021-05-10 20:55:25 +02:00 • committed by Linus Groh
parent 0853d98420
commit 5963f6f9ff
13 changed files with 736 additions and 582 deletions
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43
Userland/Libraries/LibCrypto/BigInt/Algorithms/GCD.cpp Normal file
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/*
* Copyright (c) 2020, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2020-2021, Dex♪ <dexes.ttp@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "UnsignedBigIntegerAlgorithms.h"
namespace Crypto {
void UnsignedBigIntegerAlgorithms::destructive_GCD_without_allocation(
UnsignedBigInteger& temp_a,
UnsignedBigInteger& temp_b,
UnsignedBigInteger& temp_1,
UnsignedBigInteger& temp_2,
UnsignedBigInteger& temp_3,
UnsignedBigInteger& temp_4,
UnsignedBigInteger& temp_quotient,
UnsignedBigInteger& temp_remainder,
UnsignedBigInteger& output)
{
for (;;) {
if (temp_a == 0) {
output.set_to(temp_b);
return;
}
// temp_b %= temp_a
divide_without_allocation(temp_b, temp_a, temp_1, temp_2, temp_3, temp_4, temp_quotient, temp_remainder);
temp_b.set_to(temp_remainder);
if (temp_b == 0) {
output.set_to(temp_a);
return;
}
// temp_a %= temp_b
divide_without_allocation(temp_a, temp_b, temp_1, temp_2, temp_3, temp_4, temp_quotient, temp_remainder);
temp_a.set_to(temp_remainder);
}
}
}