blob: 223d8246ee77070e3a3b0086e5a5b7fa9c726641 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// Copyright 2016 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/>.
/*
Package whisper implements the Whisper PoC-1.
(https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec)
Whisper combines aspects of both DHTs and datagram messaging systems (e.g. UDP).
As such it may be likened and compared to both, not dissimilar to the
matter/energy duality (apologies to physicists for the blatant abuse of a
fundamental and beautiful natural principle).
Whisper is a pure identity-based messaging system. Whisper provides a low-level
(non-application-specific) but easily-accessible API without being based upon
or prejudiced by the low-level hardware attributes and characteristics,
particularly the notion of singular endpoints.
*/
package whisperv5
import (
"fmt"
"time"
)
const (
EnvelopeVersion = uint64(0)
ProtocolVersion = uint64(5)
ProtocolVersionStr = "5.0"
ProtocolName = "shh"
statusCode = 0
messagesCode = 1
p2pCode = 2
mailRequestCode = 3
NumberOfMessageCodes = 32
paddingMask = byte(3)
signatureFlag = byte(4)
TopicLength = 4
signatureLength = 65
aesKeyLength = 32
saltLength = 12
AESNonceMaxLength = 12
MaxMessageLength = 0xFFFF // todo: remove this restriction after testing in morden and analizing stats. this should be regulated by MinimumPoW.
MinimumPoW = 10.0 // todo: review
padSizeLimitLower = 128 // it can not be less - we don't want to reveal the absence of signature
padSizeLimitUpper = 256 // just an arbitrary number, could be changed without losing compatibility
expirationCycle = time.Second
transmissionCycle = 300 * time.Millisecond
DefaultTTL = 50 // seconds
SynchAllowance = 10 // seconds
)
type unknownVersionError uint64
func (e unknownVersionError) Error() string {
return fmt.Sprintf("invalid envelope version %d", uint64(e))
}
// MailServer represents a mail server, capable of
// archiving the old messages for subsequent delivery
// to the peers. Any implementation must ensure that both
// functions are thread-safe. Also, they must return ASAP.
// DeliverMail should use directMessagesCode for delivery,
// in order to bypass the expiry checks.
type MailServer interface {
Archive(env *Envelope)
DeliverMail(whisperPeer *Peer, data []byte)
}
|
