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LibCrypto: Implement arbitrarily sized right shifts

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Previously we could only shift by words at a time
This commit is contained in:
Hendiadyoin1
2024-03-18 00:40:03 +01:00
committed by Andrew Kaster
parent 9045840e33
commit 1af9fa1968
Notes: sideshowbarker 2024-07-17 06:40:35 +09:00 
Author: https://github.com/Hendiadyoin1
Commit: https://github.com/SerenityOS/serenity/commit/1af9fa1968
Pull-request: https://github.com/SerenityOS/serenity/pull/23619
Issue: https://github.com/SerenityOS/serenity/issues/23575
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/DanShaders ✅
6 changed files with 34 additions and 0 deletions
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10
Userland/Libraries/LibCrypto/BigInt/Algorithms/BitwiseOperations.cpp
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@@ -6,6 +6,7 @@
*/
#include "UnsignedBigIntegerAlgorithms.h"
#include <AK/BigIntBase.h>
#include <AK/BuiltinWrappers.h>
#include <AK/NumericLimits.h>
@@ -207,6 +208,15 @@ FLATTEN void UnsignedBigIntegerAlgorithms::shift_left_without_allocation(
}
}
FLATTEN void UnsignedBigIntegerAlgorithms::shift_right_without_allocation(
UnsignedBigInteger const& number,
size_t num_bits,
UnsignedBigInteger& output)
{
output.m_words.resize_and_keep_capacity(number.length() - (num_bits / UnsignedBigInteger::BITS_IN_WORD));
Ops::shift_right(number.words_span(), num_bits, output.words_span());
}
void UnsignedBigIntegerAlgorithms::shift_left_by_n_words(
UnsignedBigInteger const& number,
size_t number_of_words,