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remove asserts that could leak timing information (credits to @pornin) #31

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conradoplg
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Closes #30 by simply removing the asserts.

I tried to expand the comment in scalar.rs to justify why borrow would never be 1, but got stuck at trying to find a case where carry would be 1 in the first place... So I just gave up on that for now.

@kevaundray kevaundray merged commit 3f360d5 into crate-crypto:master Jul 13, 2023
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Potential timing attacks in asserts
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