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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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@ -843,6 +843,14 @@ void bigint_addition_edgecases()
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FAIL(Incorrect Result);
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}
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}
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{
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I_TEST((BigInteger | Borrow with zero));
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Crypto::UnsignedBigInteger num1({ UINT32_MAX - 3, UINT32_MAX });
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Crypto::UnsignedBigInteger num2({ UINT32_MAX - 2, 0 });
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if (num1.add(num2).words() == Vector<u32> { 4294967289, 0, 1 }) {
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PASS;
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} else {
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FAIL(Incorrect Result);
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}
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void bigint_subtraction()
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