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LibCrypto: Make constructing a BigInteger from string fallible

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Previously, constructing a `UnsignedBigInteger::from_base()` could
produce an incorrect result if the input string contained a valid
Base36 digit that was out of range of the given base. The same method
would also crash if the input string contained an invalid Base36 digit.
An error is now returned in both these cases.

Constructing a BigFraction from string is now also fallible, so that we
can handle the case where we are given an input string with invalid
digits.
This commit is contained in:
Tim Ledbetter
2024-01-12 21:34:23 +00:00
committed by Andrew Kaster
parent 0b0c7693e2
commit 48a3a02238
Notes: sideshowbarker 2024-07-17 05:18:58 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/48a3a02238
Pull-request: https://github.com/SerenityOS/serenity/pull/22726
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/LucasChollet ✅
11 changed files with 68 additions and 57 deletions
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6
Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
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@@ -35,7 +35,7 @@ size_t SignedBigInteger::export_data(Bytes data, bool remove_leading_zeros) cons
return m_unsigned_data.export_data(bytes_view, remove_leading_zeros) + 1;
}
SignedBigInteger SignedBigInteger::from_base(u16 N, StringView str)
ErrorOr<SignedBigInteger> SignedBigInteger::from_base(u16 N, StringView str)
{
auto sign = false;
if (str.length() > 1) {
@@ -47,8 +47,8 @@ SignedBigInteger SignedBigInteger::from_base(u16 N, StringView str)
if (maybe_sign == '+')
str = str.substring_view(1);
}
auto unsigned_data = UnsignedBigInteger::from_base(N, str);
return { move(unsigned_data), sign };
auto unsigned_data = TRY(UnsignedBigInteger::from_base(N, str));
return SignedBigInteger { move(unsigned_data), sign };
}
ErrorOr<String> SignedBigInteger::to_base(u16 N) const