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LibCrypto: Avoid overly big allocs in intermediate ModularPower results

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If we don't limit the sizes of the intermediate results, they will grow
indefinitely, causing each iteration to take longer and longer (in both
memcpy time, and algorithm runtime).
While calculating the trimmed length is fairly expensive, it's a small
cost to pay for uniform iteration times.
This commit is contained in:
AnotherTest 2021-04-01 12:02:14 +04:30 • committed by Andreas Kling
parent 2020176f0f
commit 2601441486
3 changed files with 17 additions and 1 deletions
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Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
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@ -81,6 +81,8 @@ public:
// The "trimmed length" is the number of words after trimming leading zeroed words
size_t trimmed_length() const;
void clamp_to_trimmed_length();
UnsignedBigInteger plus(const UnsignedBigInteger& other) const;
UnsignedBigInteger minus(const UnsignedBigInteger& other) const;
UnsignedBigInteger bitwise_or(const UnsignedBigInteger& other) const;