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LibCrypto: Fix bug in big int subtraction

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A regression test was added to the suite.

This commit also generally simplifies the subtraction method.
This commit is contained in:
Itamar 2020-04-09 16:29:09 +03:00 • committed by Andreas Kling
parent 0d2777752e
commit 709c691f38
2 changed files with 19 additions and 16 deletions
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9
Userland/test-crypto.cpp
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@ -915,6 +915,15 @@ void bigint_subtraction()
// this test only verifies that we don't crash on an assertion
PASS;
}
{
I_TEST((BigInteger | Subtraction Regerssion 1));
auto num = Crypto::UnsignedBigInteger { 1 }.shift_left(256);
if (num.sub(1).words() == Vector<u32> { 4294967295, 4294967295, 4294967295, 4294967295, 4294967295, 4294967295, 4294967295, 4294967295, 0 }) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
}
void bigint_multiplication()