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LibCrypto: Prevent a signed overflow during BigInt Modular Power

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The algorithm isn't explicit about what type this needs to be. But this
passes all of the tests, so that's probably fine.
This commit is contained in:
DexesTTP
2021-05-14 09:46:41 +02:00
committed by Andreas Kling
parent 4728f2af80
commit 36a56871c0
Notes: sideshowbarker 2024-07-18 18:10:34 +09:00 
Author: https://github.com/Dexesttp
Commit: https://github.com/SerenityOS/serenity/commit/36a56871c04
Pull-request: https://github.com/SerenityOS/serenity/pull/7094
1 changed files with 3 additions and 3 deletions
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6
Userland/Libraries/LibCrypto/BigInt/Algorithms/ModularPower.cpp
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@@ -58,9 +58,9 @@ ALWAYS_INLINE static u32 inverse_wrapped(u32 value)
{
VERIFY(value & 1);
i64 b = static_cast<i64>(value);
i64 k0 = (2 - b);
i64 t = (b - 1);
u64 b = static_cast<u64>(value);
u64 k0 = (2 - b);
u64 t = (b - 1);
size_t i = 1;
while (i < 32) {
t = t * t;