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blsMultisig.go
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blsMultisig.go
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package multisig
import (
"github.com/kalyan3104/k-core/core/check"
crypto "github.com/kalyan3104/k-crypto-core-go"
)
var _ crypto.MultiSigner = (*blsMultiSigner)(nil)
type blsMultiSigner struct {
keyGen crypto.KeyGenerator
llSigner crypto.LowLevelSignerBLS
}
// NewBLSMultisig creates a new BLS multi-signer
func NewBLSMultisig(
llSigner crypto.LowLevelSignerBLS,
keyGen crypto.KeyGenerator,
) (*blsMultiSigner, error) {
if check.IfNil(llSigner) {
return nil, crypto.ErrNilLowLevelSigner
}
if check.IfNil(keyGen) {
return nil, crypto.ErrNilKeyGenerator
}
return &blsMultiSigner{
keyGen: keyGen,
llSigner: llSigner,
}, nil
}
// CreateSignatureShare returns a BLS single signature over the message with the given private key
func (bms *blsMultiSigner) CreateSignatureShare(privateKeyBytes []byte, message []byte) ([]byte, error) {
privateKey, err := convertBytesToPrivateKey(privateKeyBytes, bms.keyGen)
if err != nil {
return nil, err
}
return bms.llSigner.SignShare(privateKey, message)
}
// VerifySignatureShare verifies the single signature share with the given message and public key
func (bms *blsMultiSigner) VerifySignatureShare(publicKey []byte, message []byte, sig []byte) error {
if sig == nil {
return crypto.ErrNilSignature
}
pubKey, err := convertBytesToPubKey(publicKey, bms.keyGen)
if err != nil {
return err
}
return bms.llSigner.VerifySigShare(pubKey, message, sig)
}
// AggregateSigs aggregates the received signatures, corresponding to the given public keys into one signature
func (bms *blsMultiSigner) AggregateSigs(pubKeysSigners [][]byte, signatures [][]byte) ([]byte, error) {
if len(pubKeysSigners) != len(signatures) {
return nil, crypto.ErrInvalidParam
}
pubKeys, err := convertBytesToPubKeys(pubKeysSigners, bms.keyGen)
if err != nil {
return nil, err
}
return bms.llSigner.AggregateSignatures(bms.keyGen.Suite(), signatures, pubKeys)
}
// VerifyAggregatedSig verifies the aggregated signature validity with respect to the aggregated public keys and given message
func (bms *blsMultiSigner) VerifyAggregatedSig(pubKeysSigners [][]byte, message []byte, aggSig []byte) error {
pubKeys, err := convertBytesToPubKeys(pubKeysSigners, bms.keyGen)
if err != nil {
return err
}
return bms.llSigner.VerifyAggregatedSig(bms.keyGen.Suite(), pubKeys, aggSig, message)
}
// IsInterfaceNil returns true if there is no value under the interface
func (bms *blsMultiSigner) IsInterfaceNil() bool {
return bms == nil
}