4d44a87243
Currently, the behavior of z.ModInverse(g, n) is undefined when g and n are not relatively prime. In that case, no ModInverse exists which can be easily checked during the computation of the ModInverse. Because the ModInverse does not indicate whether the inverse exists, there are reimplementations of a "checked" ModInverse in crypto/rsa. This change removes the undefined behavior. If the ModInverse does not exist, the receiver z is unchanged and the return value is nil. This matches the behavior of ModSqrt for the case where the square root does not exist. name old time/op new time/op delta ModInverse-4 2.40µs ± 4% 2.22µs ± 0% -7.74% (p=0.016 n=5+4) name old alloc/op new alloc/op delta ModInverse-4 1.36kB ± 0% 1.17kB ± 0% -14.12% (p=0.008 n=5+5) name old allocs/op new allocs/op delta ModInverse-4 10.0 ± 0% 9.0 ± 0% -10.00% (p=0.008 n=5+5) Fixes #24922 Change-Id: If7f9d491858450bdb00f1e317152f02493c9c8a8 Reviewed-on: https://go-review.googlesource.com/108996 Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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