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signer.go
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signer.go
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// Copyright (C) 2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package teleporter
import (
"errors"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/utils/crypto/bls"
)
var (
_ Signer = (*signer)(nil)
errWrongSourceChainID = errors.New("wrong SourceChainID")
)
type Signer interface {
// Returns this node's BLS signature over an unsigned message. If the caller
// does not have the authority to sign the message, an error will be
// returned.
//
// Assumes the unsigned message is correctly initialized.
Sign(msg *UnsignedMessage) ([]byte, error)
}
func NewSigner(sk *bls.SecretKey, chainID ids.ID) Signer {
return &signer{
sk: sk,
chainID: chainID,
}
}
type signer struct {
sk *bls.SecretKey
chainID ids.ID
}
func (s *signer) Sign(msg *UnsignedMessage) ([]byte, error) {
if msg.SourceChainID != s.chainID {
return nil, errWrongSourceChainID
}
msgBytes := msg.Bytes()
sig := bls.Sign(s.sk, msgBytes)
return bls.SignatureToBytes(sig), nil
}