Fix test_sw_properties for some cofactor groups #555
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The sw_properties test failed for groups with cofactors, for which the first valid point (according to incrementing x) was on the prime order subgroup. The test assumed that the first point should have been of low order, such that multiplying it with the cofactor put it in the high order group. This patch simplifies the code, and skips over these points. Fixes arkworks-rs#553
rubdos
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mmagician and
weikengchen
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andrewmilson
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* upstream/master: (29 commits) Fix some clippy lints (arkworks-rs#570) Correct tag name & complete command suggestion (arkworks-rs#569) Open a "release-PR" against a `releases` branch (arkworks-rs#566) Allow to overwrite default impl of `msm` in TwistedEdwards form (arkworks-rs#567) Remove poly-benches. (arkworks-rs#558) DO NOT MERGE YET. Release 0.4 (arkworks-rs#512) otherwise downstream users that have not migrated will not see warning (arkworks-rs#563) use `into_bigint()` in `Debug` for `Fp<P, N>` (arkworks-rs#562) Add `frobenius_map_in_place` (arkworks-rs#557) Fix test_sw_properties for some cofactor groups (arkworks-rs#555) Move h2c tests to test-templates (arkworks-rs#554) impl `CanonicalSerialize/Deserialize` for `BigUint` (arkworks-rs#551) Fix MontFp issue in fields with 64 * k bits (arkworks-rs#550) Fix tests for Modulus plus one div four (arkworks-rs#552) fix (arkworks-rs#547) Rename all `*Parameters` to `*Config` (arkworks-rs#545) Fix doc-comment on `SWUMap` and CamelCase `(CO)DOMAIN` Small cleanups in hash-to-curve (arkworks-rs#544) Allow to overwrite the default implementation of `msm` (arkworks-rs#528) Move `multi_miller_loop` and `final_exponentiation` into `BW6Config` (arkworks-rs#542) ...
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Description
The sw_properties test failed for groups with cofactors, for which the first valid point (according to incrementing x) was on the prime order subgroup.
The test assumed that the first point should have been of low order, such that multiplying it with the cofactor put it in the high order group.
This patch simplifies the code, and skips over these points.
This version works for the experimental curves that @Tarinn and I are testing out, one of which has cofactor 2, and triggered this edge case.
Fixes #553
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