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https://github.com/logos-storage/constantine.git
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f6c02fe075
* Move cofactor clearing to dedicated per-curve subgroups file * Add BLS12-381 fast subgroup checks * Implement fast cofactor clearing for BN254_snarks * Add fast subgroup check to BN254Snarks * add BLS12_377 optimized cofactor and subgroup functions * Add BN254_Nogami * Add GT-subgroup tests * Use the new subgroup checks for Eth1 EVM precompiles
39 lines
1.3 KiB
Nim
39 lines
1.3 KiB
Nim
# Constantine
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# Copyright (c) 2018-2019 Status Research & Development GmbH
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# Copyright (c) 2020-Present Mamy André-Ratsimbazafy
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# ############################################################
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#
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# Short Weierstrass Elliptic Curves
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#
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# ############################################################
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import
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elliptic/[
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ec_shortweierstrass_affine,
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ec_shortweierstrass_jacobian,
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ec_shortweierstrass_projective,
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ec_scalar_mul
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]
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export ec_shortweierstrass_affine, ec_shortweierstrass_jacobian, ec_shortweierstrass_projective, ec_scalar_mul
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type ECP_ShortW*[F; G: static Subgroup] = ECP_ShortW_Aff[F, G] | ECP_ShortW_Jac[F, G] | ECP_ShortW_Prj[F, G]
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func projectiveFromJacobian*[F; G](
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prj: var ECP_ShortW_Prj[F, G],
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jac: ECP_ShortW_Jac[F, G]) {.inline.} =
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prj.x.prod(jac.x, jac.z)
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prj.y = jac.y
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prj.z.square(jac.z)
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prj.z *= jac.z
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func double_repeated*(P: var ECP_ShortW, num: int) {.inline.} =
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## Repeated doublings
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for _ in 0 ..< num:
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P.double()
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