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This is a rewrite of the x25519 code, that generalizes support for common primitives based on the same finite field. - Low-level operations can now be performed over the curve25519 and edwards25519 curves, as well as the ristretto255 group. - Ed25519 signatures have been implemented. - X25519 is now about twice as fast. - mem.timingSafeEqual() has been added for constant-time comparison. Domains have been clearly separated, making it easier to later add platform-specific implementations.