Commit Graph

9 Commits

Author SHA1 Message Date
Mamy Ratsimbazafy d41c653c8a
Double-width tower extension part 1 (#72)
* Implement double-width field multiplication for double-width towering

* Fp2 mul acceleration via double-width lazy reduction (pure Nim)

* Inline assembly for basic add and sub

* Use 2 registers instead of 12+ for ASM conditional copy

* Prepare assembly for extended multiprecision multiplication support

* Add assembly for mul

* initial implementation of assembly reduction

* stash current progress of assembly reduction

* Fix clobbering issue, only P256 comparison remain buggy

* Fix asm montgomery reduction for NIST P256 as well

* MULX/ADCX/ADOX multi-precision multiplication

* MULX/ADCX/ADOX reduction v1

* Add (deactivated) assembly for double-width substraction + rework benches

* Add bench to nimble and deactivate double-width for now. slower than classic

* Fix x86-32 running out of registers for mul

* Clang needs to be at v9 to support flag output constraints (Xcode 11.4.2 / OSX Catalina)

* 32-bit doesn't have enough registers for ASM mul

* Fix again Travis Clang 9 issues

* LLVM 9 is not whitelisted in travis

* deactivated assembler with travis clang

* syntax error

* another

* ...

* missing space, yeah ...
2020-08-20 10:21:39 +02:00
Mamy Ratsimbazafy d97bc9b61c
Assembly backend (#69)
* Proof-of-Concept Assembly code generator

* Tag inline per procedure so we can easily track the tradeoff on tower fields

* Implement Assembly for modular addition (but very curious off-by-one)

* Fix off-by one for moduli with non msb set

* Stash (super fast) alternative but still off by carry

* Fix GCC optimizing ASM away

* Save 1 register to allow compiling for BLS12-381 (in the GMP test)

* The compiler cannot find enough registers if the ASM file is not compiled with -O3

* Add modsub

* Add field negation

* Implement no-carry Assembly optimized field multiplication

* Expose UseX86ASM to the EC benchmark

* omit frame pointer to save registers instead of hardcoding -O3. Also ensure early clobber constraints for Clang

* Prepare for assembly fallback

* Implement fallback for CPU that don't support ADX and BMI2

* Add CPU runtime detection

* Update README closes #66

* Remove commented out code
2020-07-24 22:02:30 +02:00
Mamy Ratsimbazafy d376f08d1b
G2 / Operations on the twisted curve E'(Fp2) (#51)
* Split elliptic curve tests to better use parallel testing

* Add support for printing points on G2

* Implement multiplication and division by optimal sextic non-residue (BLS12-381)

* Implement modular square root in 𝔽p2

* Support EC add and EC double on G2 (for BLS12-381)

* Support G2 divisive twists with non-unit sextic-non-residue like BN254 snarks

* Add EC G2 bench

* cleanup some unused warnings

* Reorg the tests for parallelization and to avoid instantiating huge files
2020-06-15 22:58:56 +02:00
Mamy Ratsimbazafy 2613356281
Endomorphism acceleration for Scalar Multiplication (#44)
* Add MultiScalar recoding from "Efficient and Secure Algorithms for GLV-Based Scalar Multiplication" by Faz et al

* precompute cube root of unity - Add VM precomputation of Fp - workaround upstream bug https://github.com/nim-lang/Nim/issues/14585

* Add the φ-accelerated lookup table builder

* Add a dedicated bithacks file

* cosmetic import consistency

* Build the φ precompute table with n-1 EC additions instead of 2^(n-1) additions

* remove binary

* Add the GLV precomputations to the sage scripts

* You can't avoid it, bigint multiplication is needed at one point

* Add bigint multiplication discarding some low words

* Implement the lattice decomposition in sage

* Proper decomposition for BN254

* Prepare the code for a new scalar mul

* We compile, and now debugging hunt

* More helpers to debug GLV scalar Mul

* Fix conditional negation

* Endomorphism accelerated scalar mul working for BN254 curve

* Implement endomorphism acceleration for BLS12-381 (needed cofactor clearing of the point)

* fix nimble test script after bench rename
2020-06-14 15:39:06 +02:00
Mamy Ratsimbazafy 3d1b1fab98
Fix benchmark on ARM (#31) 2020-06-04 22:09:30 +02:00
Mamy Ratsimbazafy 82ceca6e3b
Scalar mul tests (#28)
* Add sage script for BN254

* Implement (failing) scalar multiplication tests

* Add a first test against sagemath

* Finish the tests against SAGE for BN254

* Add significant test coverage of scalar multiplication with reference checks for BN254_Snarks and BLS12_381
2020-06-04 20:37:29 +02:00
Mamy André-Ratsimbazafy 44350d08af
Add elliptic doubling in projective coordinates 2020-04-15 22:23:46 +02:00
Mamy André-Ratsimbazafy 7ae0f51000
benchmarking skips cycle counting for ARM 2020-04-15 21:24:18 +02:00
Mamy André-Ratsimbazafy e0c1e0b1c8
Add EC bench on G1 + Add throughput to benches 2020-04-15 19:38:02 +02:00