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Dmitri Bogomolov 2021-01-31 20:42:34 +02:00
parent b2d0f5fdff
commit c7bf304c6d
Signed by untrusted user: g1itch
GPG Key ID: 720A756F18DEED13
1 changed files with 121 additions and 3 deletions

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@ -74,8 +74,8 @@ All integers are encoded in big endian. (This is different from Bitcoin).
* - ?
- message_payload
- uchar[]
- The actual data, a message or an object_. Not to be confused with
- The actual data, a :ref:`message <msg-types>` or an object_.
Not to be confused with objectPayload.
Known magic values:
@ -168,7 +168,7 @@ addresses are not prefixed with a timestamp or stream in the version_ message.
* - 8
- services
- uint64_t
- same service(s) listed in version
- same service(s) listed in version_
* - 16
- IPv6/4
- char[16]
@ -221,3 +221,121 @@ Bitmessage uses `ECIES <
| 32 | MAC | uchar[] | HMACSHA256 Message Authentication Code |
Unencrypted Message Data
Message Encodings
Pubkey bitfield features
.. _msg-types:
Message types
Undefined messages received on the wire must be ignored.
When a node creates an outgoing connection, it will immediately advertise its
version. The remote node will respond with its version. No futher communication
is possible until both peers have exchanged their version.
The verack message is sent in reply to version. This message consists of only a
message header with the command string "verack". The TCP timeout starts out at
20 seconds; after verack messages are exchanged, the timeout is raised to
10 minutes.
If both sides announce that they support SSL, they MUST perform a SSL handshake
immediately after they both send and receive verack. During this SSL handshake,
the TCP client acts as a SSL client, and the TCP server acts as a SSL server.
The current implementation (v0.5.4 or later) requires the AECDH-AES256-SHA
cipher over TLSv1 protocol, and prefers the secp256k1 curve (but other curves
may be accepted, depending on the version of python and OpenSSL used).
Provide information on known nodes of the network. Non-advertised nodes should
be forgotten after typically 3 hours
Allows a node to advertise its knowledge of one or more objects. Payload
(maximum payload length: 50000 items):
getdata is used in response to an inv message to retrieve the content of a
specific object after filtering known elements.
Payload (maximum payload length: 50000 entries):
An object is a message which is shared throughout a stream. It is the only
message which propagates; all others are only between two nodes. Objects have a
type, like 'msg', or 'broadcast'. To be a valid object, the Proof Of Work must
be done. The maximum allowable length of an object (not to be confused with the
objectPayload) is |2^18| bytes.
.. |2^18| replace:: 2\ :sup:`18`\
Object types
Here are the payloads for various object types.
When a node has the hash of a public key (from an address) but not the public
key itself, it must send out a request for the public key.
A version 2 pubkey. This is still in use and supported by current clients but
new v2 addresses are not generated by clients.
Used for person-to-person messages. Note that msg objects won't contain a
version in the object header until Sun, 16 Nov 2014 22:00:00 GMT.
Users who are subscribed to the sending address will see the message appear in
their inbox. Broadcasts are version 4 or 5.
Pubkey objects and v5 broadcast objects are encrypted the same way: The data
encoded in the sender's Bitmessage address is hashed twice. The first 32 bytes
of the resulting hash constitutes the "private" encryption key and the last
32 bytes constitute a tag so that anyone listening can easily decide if this
particular message is interesting. The sender calculates the public key from
the private key and then encrypts the object with this public key. Thus anyone
who knows the Bitmessage address of the sender of a broadcast or pubkey object
can decrypt it.
The version of broadcast objects was previously 2 or 3 but was changed to 4 or
5 for protocol v3. Having a broadcast version of 5 indicates that a tag is used
which, in turn, is used when the sender's address version is >=4.