crypto/x25519: implement clearCofactor() #11355
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This is the x25519 counterpart to edwards25519.clearCofactor(). It is useful to check for low-order points in protocols where it matters and where clamping cannot work, such as PAKEs.
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This is the x25519 counterpart to
edwards25519.clearCofactor()that we already had.It is useful to check for low-order points in protocols where it matters and where clamping cannot work, such as PAKEs.