aboutsummaryrefslogtreecommitdiffstats
path: root/whisper/whisperv2/envelope.go
diff options
context:
space:
mode:
Diffstat (limited to 'whisper/whisperv2/envelope.go')
-rw-r--r--whisper/whisperv2/envelope.go150
1 files changed, 0 insertions, 150 deletions
diff --git a/whisper/whisperv2/envelope.go b/whisper/whisperv2/envelope.go
deleted file mode 100644
index 9f1c68204..000000000
--- a/whisper/whisperv2/envelope.go
+++ /dev/null
@@ -1,150 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// Contains the Whisper protocol Envelope element. For formal details please see
-// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#envelopes.
-
-package whisperv2
-
-import (
- "crypto/ecdsa"
- "encoding/binary"
- "fmt"
- "math/big"
- "time"
-
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/common/math"
- "github.com/ethereum/go-ethereum/crypto"
- "github.com/ethereum/go-ethereum/crypto/ecies"
- "github.com/ethereum/go-ethereum/rlp"
-)
-
-// Envelope represents a clear-text data packet to transmit through the Whisper
-// network. Its contents may or may not be encrypted and signed.
-type Envelope struct {
- Expiry uint32 // Whisper protocol specifies int32, really should be int64
- TTL uint32 // ^^^^^^
- Topics []Topic
- Data []byte
- Nonce uint32
-
- hash common.Hash // Cached hash of the envelope to avoid rehashing every time
-}
-
-// NewEnvelope wraps a Whisper message with expiration and destination data
-// included into an envelope for network forwarding.
-func NewEnvelope(ttl time.Duration, topics []Topic, msg *Message) *Envelope {
- return &Envelope{
- Expiry: uint32(time.Now().Add(ttl).Unix()),
- TTL: uint32(ttl.Seconds()),
- Topics: topics,
- Data: msg.bytes(),
- Nonce: 0,
- }
-}
-
-// Seal closes the envelope by spending the requested amount of time as a proof
-// of work on hashing the data.
-func (self *Envelope) Seal(pow time.Duration) {
- d := make([]byte, 64)
- copy(d[:32], self.rlpWithoutNonce())
-
- finish, bestBit := time.Now().Add(pow).UnixNano(), 0
- for nonce := uint32(0); time.Now().UnixNano() < finish; {
- for i := 0; i < 1024; i++ {
- binary.BigEndian.PutUint32(d[60:], nonce)
-
- d := new(big.Int).SetBytes(crypto.Keccak256(d))
- firstBit := math.FirstBitSet(d)
- if firstBit > bestBit {
- self.Nonce, bestBit = nonce, firstBit
- }
- nonce++
- }
- }
-}
-
-// rlpWithoutNonce returns the RLP encoded envelope contents, except the nonce.
-func (self *Envelope) rlpWithoutNonce() []byte {
- enc, _ := rlp.EncodeToBytes([]interface{}{self.Expiry, self.TTL, self.Topics, self.Data})
- return enc
-}
-
-// Open extracts the message contained within a potentially encrypted envelope.
-func (self *Envelope) Open(key *ecdsa.PrivateKey) (msg *Message, err error) {
- // Split open the payload into a message construct
- data := self.Data
-
- message := &Message{
- Flags: data[0],
- Sent: time.Unix(int64(self.Expiry-self.TTL), 0),
- TTL: time.Duration(self.TTL) * time.Second,
- Hash: self.Hash(),
- }
- data = data[1:]
-
- if message.Flags&signatureFlag == signatureFlag {
- if len(data) < signatureLength {
- return nil, fmt.Errorf("unable to open envelope. First bit set but len(data) < len(signature)")
- }
- message.Signature, data = data[:signatureLength], data[signatureLength:]
- }
- message.Payload = data
-
- // Decrypt the message, if requested
- if key == nil {
- return message, nil
- }
- err = message.decrypt(key)
- switch err {
- case nil:
- return message, nil
-
- case ecies.ErrInvalidPublicKey: // Payload isn't encrypted
- return message, err
-
- default:
- return nil, fmt.Errorf("unable to open envelope, decrypt failed: %v", err)
- }
-}
-
-// Hash returns the SHA3 hash of the envelope, calculating it if not yet done.
-func (self *Envelope) Hash() common.Hash {
- if (self.hash == common.Hash{}) {
- enc, _ := rlp.EncodeToBytes(self)
- self.hash = crypto.Keccak256Hash(enc)
- }
- return self.hash
-}
-
-// DecodeRLP decodes an Envelope from an RLP data stream.
-func (self *Envelope) DecodeRLP(s *rlp.Stream) error {
- raw, err := s.Raw()
- if err != nil {
- return err
- }
- // The decoding of Envelope uses the struct fields but also needs
- // to compute the hash of the whole RLP-encoded envelope. This
- // type has the same structure as Envelope but is not an
- // rlp.Decoder so we can reuse the Envelope struct definition.
- type rlpenv Envelope
- if err := rlp.DecodeBytes(raw, (*rlpenv)(self)); err != nil {
- return err
- }
- self.hash = crypto.Keccak256Hash(raw)
- return nil
-}