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63 lines
1.5 KiB
63 lines
1.5 KiB
package verify
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import (
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"encoding/binary"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/consensus/quorum"
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bls_cosi "github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/multibls"
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"github.com/harmony-one/harmony/shard"
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"github.com/pkg/errors"
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)
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var (
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errQuorumVerifyAggSign = errors.New("insufficient voting power to verify aggreate sig")
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errAggregateSigFail = errors.New("could not verify hash of aggregate signature")
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)
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// AggregateSigForCommittee ..
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func AggregateSigForCommittee(
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committee *shard.Committee,
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aggSignature *bls.Sign,
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hash common.Hash,
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blockNum uint64,
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epoch *big.Int,
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bitmap []byte,
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) error {
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committerKeys, err := committee.BLSPublicKeys()
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if err != nil {
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return err
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}
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mask, err := bls_cosi.NewMask(committerKeys, nil)
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if err != nil {
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return err
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}
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if err := mask.SetMask(bitmap); err != nil {
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return err
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}
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decider := quorum.NewDecider(
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quorum.SuperMajorityStake, committee.ShardID,
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)
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decider.SetMyPublicKeyProvider(func() (*multibls.PublicKey, error) {
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return nil, nil
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})
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if _, err := decider.SetVoters(committee, epoch); err != nil {
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return err
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}
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if !decider.IsQuorumAchievedByMask(mask) {
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return errQuorumVerifyAggSign
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}
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blockNumBytes := make([]byte, 8)
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binary.LittleEndian.PutUint64(blockNumBytes, blockNum)
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commitPayload := append(blockNumBytes, hash[:]...)
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if !aggSignature.VerifyHash(mask.AggregatePublic, commitPayload) {
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return errAggregateSigFail
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}
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return nil
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}
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