variable signing precompute table
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Authored by deadalnix on Feb 28 2020, 02:36.

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Reviewers

Fabien

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Restricted Project

Commits

rSTAGING400ffebd985d: variable signing precompute table
rABC400ffebd985d: variable signing precompute table

Summary

make ECMULT_GEN_PREC_BITS configurable

ecmult_static_context.h: add compile time config assertion (#3) - Prevents accidentally using a file which was generated with a
different configuration.

README: mention valgrind issue

With --with-ecmult-gen-precision=8, valgrind needs a max stack size
adjustment to not run into a stack switching heuristic:

http://valgrind.org/docs/manual/manual-core.html

-max-stackframe= [default: 2000000]
The maximum size of a stack frame. If the stack pointer moves by more than this amount then Valgrind will assume that the program is switching to a different stack.

You may need to use this option if your program has large stack-allocated arrays.

basic-config: undef ECMULT_WINDOW_SIZE before (re-)defining it

This is a backport of libsecp256k1 PR337

Test Plan

Run make and cmake build and check the pass.
Pass random values to SECP256K1_ECMULT_GEN_PRECISION and check that cmake fails.

Diff Detail

Repository

rABC Bitcoin ABC

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Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

deadalnix created this revision.Feb 28 2020, 02:36

Herald added a reviewer: Restricted Project. · View Herald TranscriptFeb 28 2020, 02:36

Fix readme

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Harbormaster completed remote builds in B9624: Diff 16596.Feb 28 2020, 05:51

Build Bitcoin-ABC / Diffs / Diff Testing passed.

Harbormaster completed remote builds in B9623: Diff 16595.Feb 28 2020, 05:54

Fabien added a subscriber: Fabien.Feb 28 2020, 11:29

Fabien added inline comments.

src/secp256k1/CMakeLists.txt
211 ↗	(On Diff #16596)	Hum, not sure the message is really helpful :)

Fabien requested changes to this revision.Feb 28 2020, 14:08

This revision now requires changes to proceed.Feb 28 2020, 14:08

Proper error message

Build Bitcoin-ABC / Diffs / Diff Testing started.

Build Bitcoin-ABC / Diffs / Diff Testing passed.

Harbormaster completed remote builds in B9638: Diff 16623.Feb 28 2020, 17:01

deadalnix added a child revision: D5377: Add SECURITY.md.Feb 28 2020, 23:22

Fabien accepted this revision.Mar 2 2020, 07:30

Fabien added inline comments.

src/secp256k1/CMakeLists.txt
216 ↗	(On Diff #16623)	You can use your variable to avoid duplicating the values: message(FATAL_ERROR "SECP256K1_ECMULT_GEN_PRECISION should be one of ${VALID_PRECISIONS}") You can even join with `", "` if you want to make it prettier.