curve: add X25519_LOW_ORDER_POINTS constant
#814
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Adds a table of low order points, adapted from https://cr.yp.to/ecdh.html, which suggests that non-Diffie-Hellman protocols that depend on "contributory" behavior should reject them. They're also useful for testing, e.g. how a protocol implementation handles them during a key exchange (noting that a well-implemented AKE shouldn't need to explicitly reject them, as someone attempting to use them for MitM should be spotted as a transcript mismatch).
tarcieri
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X25519_LOW_ORDER_POINTS constant
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Adds a table of low order points, adapted from https://cr.yp.to/ecdh.html, which suggests that non-Diffie-Hellman protocols that depend on "contributory" behavior should reject them.
They're also useful for testing, e.g. how a protocol implementation handles them during a key exchange (noting that a well-implemented AKE shouldn't need to explicitly reject them, as someone attempting to use them for MitM should be spotted as a transcript mismatch).