mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2025-01-07 11:32:20 +00:00
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
/*
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Copyright 2022 Erigon-Lightclient contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"crypto/sha256"
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"errors"
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"fmt"
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"hash"
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"sync"
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blst "github.com/supranational/blst/bindings/go"
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)
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var hasherPool = sync.Pool{
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New: func() interface{} {
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return sha256.New()
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},
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}
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func Keccak256(data []byte) [32]byte {
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h, ok := hasherPool.Get().(hash.Hash)
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if !ok {
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h = sha256.New()
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}
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defer hasherPool.Put(h)
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h.Reset()
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var b [32]byte
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h.Write(data)
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h.Sum(b[:0])
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return b
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}
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// PublicKeyFromBytes creates a BLS public key from a BigEndian byte slice.
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func PublicKeyFromBytes(pubKey []byte) (*blst.P1Affine, error) {
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if len(pubKey) != 48 {
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return nil, fmt.Errorf("public key must be 48 bytes")
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}
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// Subgroup check NOT done when decompressing pubkey.
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p := new(blst.P1Affine).Uncompress(pubKey)
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if p == nil {
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return nil, errors.New("could not unmarshal bytes into public key")
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}
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// Subgroup and infinity check
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if !p.KeyValidate() {
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return nil, fmt.Errorf("infinite key")
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}
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return p, nil
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}
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// SignatureFromBytes creates a BLS signature from a LittleEndian byte slice.
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func SignatureFromBytes(sig []byte) (*blst.P2Affine, error) {
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if len(sig) != 96 {
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return nil, fmt.Errorf("signature must be 96 bytes")
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}
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signature := new(blst.P2Affine).Uncompress(sig)
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if signature == nil {
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return nil, errors.New("could not unmarshal bytes into signature")
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}
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// Group check signature. Do not check for infinity since an aggregated signature
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// could be infinite.
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if !signature.SigValidate(false) {
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return nil, errors.New("signature not in group")
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}
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return signature, nil
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}
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