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signed-msg.go
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signed-msg.go
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package peer
import (
"bytes"
"encoding/hex"
"github.com/aperturerobotics/bifrost/hash"
crypto "github.com/libp2p/go-libp2p/core/crypto"
"github.com/pkg/errors"
"github.com/zeebo/blake3"
)
// NewSignedMsg constructs/signs/encodes a new signed message.
func NewSignedMsg(
privKey crypto.PrivKey,
hashType hash.HashType,
innerData []byte,
) (*SignedMsg, error) {
peerID, err := IDFromPrivateKey(privKey)
if err != nil {
return nil, err
}
msg := &SignedMsg{
FromPeerId: IDB58Encode(peerID),
Data: innerData,
}
if err := msg.Sign(privKey, hashType); err != nil {
return nil, err
}
return msg, nil
}
// UnmarshalSignedMsg parses a signed message.
func UnmarshalSignedMsg(data []byte) (*SignedMsg, error) {
m := &SignedMsg{}
err := m.UnmarshalVT(data)
if err == nil {
err = m.Validate()
}
if err != nil {
return nil, err
}
return m, err
}
// ComputeMessageID computes a message id for a signed message.
func (m *SignedMsg) ComputeMessageID() string {
inner := bytes.Join([][]byte{
m.GetSignature().GetSigData(),
[]byte(m.GetFromPeerId()),
}, nil)
h := blake3.Sum256(inner)
return hex.EncodeToString(h[:])
}
// ParseFromPeerID unmarshals the peer id.
func (m *SignedMsg) ParseFromPeerID() (ID, error) {
return IDB58Decode(m.GetFromPeerId())
}
// ExtractPubKey extracts the public key from the peer id.
func (m *SignedMsg) ExtractPubKey() (crypto.PubKey, ID, error) {
fromPeerID, err := m.ParseFromPeerID()
if err != nil {
return nil, ID(""), err
}
if len(fromPeerID) == 0 {
return nil, ID(""), ErrEmptyPeerID
}
pubKey, err := fromPeerID.ExtractPublicKey()
if err != nil {
return nil, fromPeerID, err
}
return pubKey, fromPeerID, nil
}
// ExtractAndVerify extracts public key & uses it to verify message
func (m *SignedMsg) ExtractAndVerify() (crypto.PubKey, ID, error) {
pubKey, peerID, err := m.ExtractPubKey()
if err != nil {
return nil, peerID, err
}
sigErr := m.Verify(pubKey)
if sigErr != nil {
return pubKey, peerID, err
}
return pubKey, peerID, nil
}
// Sign signs the inner body with the private key.
// Disallows empty message.
func (m *SignedMsg) Sign(privKey crypto.PrivKey, hashType hash.HashType) error {
innerData := m.GetData()
if len(innerData) == 0 {
return ErrEmptyBody
}
sig, err := NewSignature(
privKey,
hashType,
innerData,
false,
)
if err != nil {
return err
}
m.Signature = sig
return nil
}
// Verify verifies the signature against a public key.
func (m *SignedMsg) Verify(pubKey crypto.PubKey) error {
// validate signature
sigOk, sigErr := m.GetSignature().VerifyWithPublic(pubKey, m.GetData())
if !sigOk && sigErr == nil {
sigErr = ErrSignatureInvalid
}
return sigErr
}
// Validate checks the signed message.
func (m *SignedMsg) Validate() error {
if len(m.GetData()) == 0 {
return ErrEmptyBody
}
if len(m.GetFromPeerId()) == 0 {
return ErrEmptyPeerID
}
if err := m.GetSignature().Validate(); err != nil {
return errors.Wrap(err, "message signature")
}
_, id, err := m.ExtractAndVerify()
if err != nil {
return errors.Wrap(err, "message verify")
}
if err := id.Validate(); err != nil {
return errors.Wrap(err, "message peer id")
}
return nil
}