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LibCrypto: Fix a bug in big int addition
There was a bug when dealing with a carry when the addition result for the current word was UINT32_MAX. This commit also adds a regression test for the bug.
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2 changed files with 9 additions and 1 deletions
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@ -39,7 +39,7 @@ UnsignedBigInteger UnsignedBigInteger::add(const UnsignedBigInteger& other)
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u32 word_addition_result = shorter->m_words[i] + longer->m_words[i];
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u8 carry_out = 0;
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// if there was a carry, the result will be smaller than any of the operands
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if (word_addition_result < shorter->m_words[i]) {
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if (word_addition_result + carry < shorter->m_words[i]) {
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carry_out = 1;
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}
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if (carry) {
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