chore: move PacketV2 to channel/v2 proto and rename it to Packet (#7357)

* chore: move PacketV2 to channel/v2

* remove file accidentally added

* chore: created packet.go for v2

* rename

modules/core/04-channel/types/packet.go

@@ -101,42 +101,6 @@ func commitV2Packet(packet Packet) []byte {
  return hash[:]
 }
 
-// CommitPacketV2 returns the V2 packet commitment bytes. The commitment consists of:
-// sha256_hash(timeout) + sha256_hash(destinationID) + sha256_hash(packetData) from a given packet.
-// This results in a fixed length preimage.
-// NOTE: A fixed length preimage is ESSENTIAL to prevent relayers from being able
-// to malleate the packet fields and create a commitment hash that matches the original packet.
-func CommitPacketV2(packet PacketV2) []byte {
- buf := sdk.Uint64ToBigEndian(packet.GetTimeoutTimestamp())
-
- destIDHash := sha256.Sum256([]byte(packet.DestinationId))
- buf = append(buf, destIDHash[:]...)
-
- for _, data := range packet.Data {
- buf = append(buf, hashPacketData(data)...)
- }
-
- hash := sha256.Sum256(buf)
- return hash[:]
-}
-
-// hashPacketData returns the hash of the packet data.
-func hashPacketData(data PacketData) []byte {
- var buf []byte
- sourceHash := sha256.Sum256([]byte(data.SourcePort))
- buf = append(buf, sourceHash[:]...)
- destHash := sha256.Sum256([]byte(data.DestinationPort))
- buf = append(buf, destHash[:]...)
- payloadValueHash := sha256.Sum256(data.Payload.Value)
- buf = append(buf, payloadValueHash[:]...)
- payloadEncodingHash := sha256.Sum256([]byte(data.Payload.Encoding))
- buf = append(buf, payloadEncodingHash[:]...)
- payloadVersionHash := sha256.Sum256([]byte(data.Payload.Version))
- buf = append(buf, payloadVersionHash[:]...)
- hash := sha256.Sum256(buf)
- return hash[:]
-}
-
 // CommitAcknowledgement returns the hash of commitment bytes
 func CommitAcknowledgement(data []byte) []byte {
  hash := sha256.Sum256(data)
@@ -264,33 +228,3 @@ func (p PacketId) Validate() error {
 func NewPacketID(portID, channelID string, seq uint64) PacketId {
  return PacketId{PortId: portID, ChannelId: channelID, Sequence: seq}
 }
-
-// ConvertPacketV1toV2 constructs a PacketV2 from a Packet.
-func ConvertPacketV1toV2(packet Packet) (PacketV2, error) {
- if packet.ProtocolVersion != IBC_VERSION_2 {
- return PacketV2{}, errorsmod.Wrapf(ErrInvalidPacket, "expected protocol version %s, got %s instead", IBC_VERSION_2, packet.ProtocolVersion)
- }
-
- encoding := strings.TrimSpace(packet.Encoding)
- if encoding == "" {
- encoding = "json"
- }
-
- return PacketV2{
- Sequence: packet.Sequence,
- SourceId: packet.SourceChannel,
- DestinationId: packet.DestinationChannel,
- TimeoutTimestamp: packet.TimeoutTimestamp,
- Data: []PacketData{
- {
- SourcePort: packet.SourcePort,
- DestinationPort: packet.DestinationPort,
- Payload: Payload{
- Version: packet.AppVersion,
- Encoding: encoding,
- Value: packet.Data,
- },
- },
- },
- }, nil
-}