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LibCrypto: Add a += operation to UnsignedBigIntegerAlgorithms

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This new operation is immediately used in several existing algorithms.
This commit is contained in:
DexesTTP
2021-05-12 10:47:21 +02:00
committed by Linus Groh
parent f4e6f58cc6
commit 5071989545
Notes: sideshowbarker 2024-07-18 18:13:44 +09:00 
Author: https://github.com/Dexesttp
Commit: https://github.com/SerenityOS/serenity/commit/5071989545a
Pull-request: https://github.com/SerenityOS/serenity/pull/7067
Reviewed-by: https://github.com/alimpfard
10 changed files with 151 additions and 47 deletions
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12
Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
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@@ -144,6 +144,15 @@ void UnsignedBigInteger::clamp_to_trimmed_length()
m_words.resize(length);
}
void UnsignedBigInteger::resize_with_leading_zeros(size_t new_length)
{
size_t old_length = length();
if (old_length < new_length) {
m_words.resize_and_keep_capacity(new_length);
__builtin_memset(&m_words.data()[old_length], 0, (new_length - old_length) * sizeof(u32));
}
}
FLATTEN UnsignedBigInteger UnsignedBigInteger::plus(const UnsignedBigInteger& other) const
{
UnsignedBigInteger result;
@@ -215,9 +224,8 @@ FLATTEN UnsignedBigInteger UnsignedBigInteger::multiplied_by(const UnsignedBigIn
UnsignedBigInteger temp_shift_result;
UnsignedBigInteger temp_shift_plus;
UnsignedBigInteger temp_shift;
UnsignedBigInteger temp_plus;
UnsignedBigIntegerAlgorithms::multiply_without_allocation(*this, other, temp_shift_result, temp_shift_plus, temp_shift, temp_plus, result);
UnsignedBigIntegerAlgorithms::multiply_without_allocation(*this, other, temp_shift_result, temp_shift_plus, temp_shift, result);
return result;
}