go-pulse/crypto/bls12381/utils.go

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core/vm, crypto/bls12381, params: add bls12-381 elliptic curve precompiles (#21018) * crypto: add bls12-381 elliptic curve wrapper * params: add bls12-381 precompile gas parameters * core/vm: add bls12-381 precompiles * core/vm: add bls12-381 precompile tests * go.mod, go.sum: use latest bls12381 lib * core/vm: move point encode/decode functions to base library * crypto/bls12381: introduce bls12-381 library init function * crypto/bls12381: import bls12381 elliptic curve implementation * go.mod, go.sum: remove bls12-381 library * remove unsued frobenious coeffs supress warning for inp that used in asm * add mappings tests for zero inputs fix swu g2 minus z inverse constant * crypto/bls12381: fix typo * crypto/bls12381: better comments for bls12381 constants * crypto/bls12381: swu, use single conditional for e2 * crypto/bls12381: utils, delete empty line * crypto/bls12381: utils, use FromHex for string to big * crypto/bls12381: g1, g2, strict length check for FromBytes * crypto/bls12381: field_element, comparision changes * crypto/bls12381: change swu, isogeny constants with hex values * core/vm: fix point multiplication comments * core/vm: fix multiexp gas calculation and lookup for g1 and g2 * core/vm: simpler imput length check for multiexp and pairing precompiles * core/vm: rm empty multiexp result declarations * crypto/bls12381: remove modulus type definition * crypto/bls12381: use proper init function * crypto/bls12381: get rid of new lines at fatal desciprtions * crypto/bls12-381: fix no-adx assembly multiplication * crypto/bls12-381: remove old config function * crypto/bls12381: update multiplication backend this commit changes mul backend to 6limb eip1962 backend mul assign operations are dropped * core/vm/contracts_tests: externalize test vectors for precompiles * core/vm/contracts_test: externalize failure-cases for precompiles * core/vm: linting * go.mod: tiny up sum file * core/vm: fix goimports linter issues * crypto/bls12381: build tags for plain ASM or ADX implementation Co-authored-by: Martin Holst Swende <martin@swende.se> Co-authored-by: Péter Szilágyi <peterke@gmail.com>
2020-06-03 06:44:32 +00:00
// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package bls12381
import (
"errors"
"math/big"
"github.com/ethereum/go-ethereum/common"
)
func bigFromHex(hex string) *big.Int {
return new(big.Int).SetBytes(common.FromHex(hex))
}
// decodeFieldElement expects 64 byte input with zero top 16 bytes,
// returns lower 48 bytes.
func decodeFieldElement(in []byte) ([]byte, error) {
if len(in) != 64 {
return nil, errors.New("invalid field element length")
}
// check top bytes
for i := 0; i < 16; i++ {
if in[i] != byte(0x00) {
return nil, errors.New("invalid field element top bytes")
}
}
out := make([]byte, 48)
copy(out[:], in[16:])
return out, nil
}