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LibCrypto: Add {Signed,Unsigned}BigInteger::from_base{2, 8, 16} helpers

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These can be used to create BigInteger instances from non-decimal
number strings.
This commit is contained in:
Idan Horowitz
2021-06-14 02:18:06 +03:00
committed by Linus Groh
parent e4e6e03364
commit 2ad2e055e2
Notes: sideshowbarker 2024-07-18 12:16:53 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/2ad2e055e28
Pull-request: https://github.com/SerenityOS/serenity/pull/8045
Reviewed-by: https://github.com/linusg
4 changed files with 69 additions and 2 deletions
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36
Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
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@@ -5,6 +5,7 @@
*/
#include "UnsignedBigInteger.h"
#include <AK/CharacterTypes.h>
#include <AK/StringBuilder.h>
#include <AK/StringHash.h>
#include <LibCrypto/BigInt/Algorithms/UnsignedBigIntegerAlgorithms.h>
@@ -71,7 +72,40 @@ UnsignedBigInteger UnsignedBigInteger::from_base10(const String& str)
UnsignedBigInteger ten { 10 };
for (auto& c : str) {
result = result.multiplied_by(ten).plus(c - '0');
result = result.multiplied_by(ten).plus(parse_ascii_digit(c));
}
return result;
}
UnsignedBigInteger UnsignedBigInteger::from_base2(const String& str)
{
UnsignedBigInteger result;
UnsignedBigInteger two { 2 };
for (auto& c : str) {
result = result.multiplied_by(two).plus(parse_ascii_digit(c));
}
return result;
}
UnsignedBigInteger UnsignedBigInteger::from_base8(const String& str)
{
UnsignedBigInteger result;
UnsignedBigInteger eight { 8 };
for (auto& c : str) {
result = result.multiplied_by(eight).plus(parse_ascii_digit(c));
}
return result;
}
UnsignedBigInteger UnsignedBigInteger::from_base16(const String& str)
{
UnsignedBigInteger result;
UnsignedBigInteger sixteen { 16 };
for (auto& c : str) {
result = result.multiplied_by(sixteen).plus(parse_ascii_hex_digit(c));
}
return result;
}